Composition for reinforced and filled high density rigid polyurethane foam products and method of making same

Claim 2

In a process for manufacturing in a mold a rigid polyurethane foam product having a density of from 10 to 80 lb/ft 3 with said foam being formed from the reaction of an isocyanate component and a polyol component having a highly branched polyol having a molecular weight per branch of approximately 300 to 800 with at least one said component including a suitable blowing agent, the steps comprising: heating the polyol component and isocyanate component to a preselected temperature above 74° F, mixing the preheated polyol component and isocyanate component, mixing in silica sand and chopped glass fibers with the viscosity of the admixed components being in the range of from around 1200 cps to around 3600 cps, said chopped glass fibers being in the range of from 3 to 25% by weight of the foamed product, said silica sand being in the range of from 10 to 75% by weight of the foamed product, with the polyurethane being no less than about 20% by weight of the foamed product, said silica sand being of a mesh size of from No. 30 U.S. sieve to No. 200 U.S. sieve, said chopped glass fibers being 1/32" to 1" in length with each fiber being comprised of a plurality of filament strands, heating the mold to a temperature approximately at or above the temperature of the preheated materials, pouring the admixed components into the mold for foaming.

Claim 3

In a process for manufacturing in a mold a rigid polyurethane foam product having a density of from 10 to 80 lb/ft 3 with said foam being formed from the reaction of an isocyanate component and a polyol side having a highly branched polyol having a molecular weight per branch of approximately 300 to 800, the steps comprising: mixing a fluorinated, halogenated saturated aliphatic hydrocarbon solvent blowing agent in the polyol side, said blowing agent having a boiling point greater than around 115° F, heating the polyol component and isocyanate component to a temperature around 115° F, mixing the preheated polyol component and isocyanate side, mixing in silica sand and chopped glass fibers with the viscosity of the admixed components being in the range of from around 1200 cps to around 3600 cps, said chopped glass fibers being in the range of from 3 to 25% by weight of the foamed product, said silica sand being in the range of from 10 to 75% by weight of the foamed product, with the polyurethane being no less than about 20% by weight of the foamed product, said silica sand being of a mesh size of from No. 30 U.S. sieve to No. 200 U.S. sieve, said chopped glass fibers being 1/32" to 1" in length with each fiber being comprised of a plurality of filament strands, heating the mold to a temperature approximately at or above the temperature of the preheated materials, pouring the admixed components into the mold for foaming.

Claim 4

In a process for manufacturing in a mold a rigid polyurethane foam product having a density of from 10 to 80 lb/ft 3 with said foam being formed from the reaction of an isocyanate component and a polyol side having a highly branched polyol having a molecular weight per branch of approximately 300 to 800, the steps comprising: mixing a fluorinated, halogenated saturated aliphatic hydrocarbon solvent blowing agent in the polyol side, said blowing agent having a boiling point greater than around 115° F, heating the polyol component and isocyanate component to a temperature around 115° F, mixing the preheated polyol component and isocyanate side, mixing in silica sand and chopped glass fibers with the viscosity of the admixed components being in the range of from around 1200 cps to around 3600 cps, said chopped glass fibers being in the range of from 3 to 25% by weight of the foamed product, said silica sand being in the range of from 10 to 75% by weight of the foamed product, with the polyurethane being no less than about 20% by weight of the foamed product, said silica sand being of a mesh size of from No. 30 U.S. sieve to No. 200 U.S. sieve, said chopped glass fibers being 1/32" to 1" in length with each fiber being comprised of a plurality of filament strands, heating the mold to a temperature approximately at or above the temperature of the preheated materials, pouring the admixed components into the mold for foaming.

Claim 5

In a process for manufacturing in a mold a rigid polyurethane foam product having a density of from 10 to 80 lb/ft 3 with said foam being formed from the reaction of an isocyanate component and a polyol component having a highly branched polyol having a molecular weight per branch of approximately 300 to 800 with at least one said component having a suitable blowing agent, the steps comprising: heating the polyol component and isocyanate component to a preselected temperature above 74° F, mixing the preheated polyol component and isocyanate component, mixing in silica sand and chopped glass fibers with the viscosity of the admixed components being in the range of from around 1200 cps to 3600 cps, said chopped glass fibers being in the range of from 5 to 15% by weight of the foamed product, said silica sand being in the range of from 20 to 60% by weight of the foamed product, with the polyurethane being no less than about 20% by weight of the foamed product, said silica sand being of a mesh size of from No. 30 U.S. sieve to No. 200 U.S. sieve, said chopped glass fibers being 1/32" to 1" in length with each fiber being comprised of a plurality of filament strands, heating the mold to a temperature approximately at or above the temperature of the preheated materials, pouring the admixed components into the mold for foaming.

Claim 6

In a process for manufacturing in a mold a rigid polyurethane foam product having a density of from 10 to 80 lb/ft 3 with said foam being formed from the reaction of an isocyanate component and a polyol component having a highly branched polyol having a molecular weight per branch of approximately 300 to 800 with at least one said component having a suitable blowing agent, the steps comprising: heating the polyol component and isocyanate component to a preselected temperature above 74° F, mixing the preheated polyol component and isocyanate component, mixing in silica sand and chopped glass fibers with the viscosity of the admixed components being in the range of from around 1200 cps to 3600 cps, said chopped glass fibers being in the range of from 5 to 15% by weight of the foamed product, said silica sand being in the range of from 20 to 60% by weight of the foamed product, with the polyurethane being no less than about 20% by weight of the foamed product, said silica sand being of a mesh size of from No. 30 U.S. sieve to No. 200 U.S. sieve, said chopped glass fibers being 1/32" to 1" in length with each fiber being comprised of a plurality of filament strands, heating the mold to a temperature approximately at or above the temperature of the preheated materials, pouring the admixed components into the mold for foaming.

Claim 7

In a process for manufacturing in a mold a rigid polyurethane foam product having a density of from 10 to 80 lb/ft 3 with said foam being formed from the reaction of an isocyanate component and a polyol component having a highly branched polyol having a molecular weight per branch of approximately 300 to 800 with at least one said component including a suitable blowing agent, the steps comprising: heating the polyol component and isocyanate component to a preselected temperature above 74° F, mixing the preheated polyol component and isocyanate component, mixing in silica sand and chopped glass fibers, said chopped glass fibers being in the range of from 5 to 15% by weight of the foamed product, said silica sand being in the range of from 20 to 60% by weight of the foamed product, the grains of said silica sand being of a size substantially larger than finely divided silica and having a mesh size of from No. 30 U.S. sieve to No. 200 U.S. sieve, said chopped glass fibers being 1/32" to 1" in length with each fiber being comprised of a plurality of filament strands, pouring the admixed components into the mold for foaming.

Claim 8

In a process for manufacturing in a mold a rigid polyurethane foam product having a density of from 10 to 80 lb/ft 3 with said foam being formed from the reaction of an isocyanate component and a polyol component having a highly branched polyol having a molecular weight per branch of approximately 300 to 800 with at least one said component including a suitable blowing agent, the steps comprising: heating the polyol component and isocyanate component to a preselected temperature above 74° F, mixing the preheated polyol component and isocyanate component, mixing in silica sand and chopped glass fibers, said chopped glass fibers being in the range of from 5 to 15% by weight of the foamed product, said silica sand being in the range of from 20 to 60% by weight of the foamed product, the grains of said silica sand being of a size substantially larger than finely divided silica and having a mesh size of from No. 30 U.S. sieve to No. 200 U.S. sieve, said chopped glass fibers being 1/32" to 1" in length with each fiber being comprised of a plurality of filament strands, pouring the admixed components into the mold for foaming.

Claim 9

In a process for manufacturing in a mold a rigid polyurethane foam product having a density of from 10 to 80 lb/ft 3 with said form being formed from the reaction of an isocyanate component and a polyol component having a highly branched polyol having a molecular weight per branch of approximately 300 to 800 with at least one said component including a suitable blowing agent, the steps comprising: mixing the polyol component and isocyanate component, mixing in silica sand and chopped glass fibers with the viscosity of the admixed components being at a preselected magnitude sufficiently high to hold said glass fibers evenly distributed, said chopped glass fibers being in the range of from 3 to 25% by weight of the foamed product, said silica sand being of a preselected magnitude and sufficient to obviate the effects of air entrapped with said glass fibers, the grains of said silica sand being of a size substantially larger than finely divided silica and having a mesh size of from No. 30 U.S. sieve to No. 200 U.S. sieve, said chopped glass fibers being 1/32" to 1" in length with each fiber being comprised of a plurality of filament strands, pouring the admixed components into the mold for foaming.

Claim 10

In a process for manufacturing in a mold a rigid polyurethane foam product having a density of from 10 to 80 lb/ft 3 with said form being formed from the reaction of an isocyanate component and a polyol component having a highly branched polyol having a molecular weight per branch of approximately 300 to 800 with at least one said component including a suitable blowing agent, the steps comprising: mixing the polyol component and isocyanate component, mixing in silica sand and chopped glass fibers with the viscosity of the admixed components being at a preselected magnitude sufficiently high to hold said glass fibers evenly distributed, said chopped glass fibers being in the range of from 3 to 25% by weight of the foamed product, said silica sand being of a preselected magnitude and sufficient to obviate the effects of air entrapped with said glass fibers, the grains of said silica sand being of a size substantially larger than finely divided silica and having a mesh size of from No. 30 U.S. sieve to No. 200 U.S. sieve, said chopped glass fibers being 1/32" to 1" in length with each fiber being comprised of a plurality of filament strands, pouring the admixed components into the mold for foaming.

Claim 11

In a process for manufacturing in a mold a rigid polyurethane foam product having a density of from 10 to 80 lb/ft 3 with said foam being formed from the reaction of an isocyanate component and a polyol component having a highly branched polyol having a molecular weight per branch of approximately 300 to 800 with at least one said component including a suitable blowing agent, the steps comprising: mixing the polyol component and isocyanate component, mixing in silica sand and chopped glass fibers with the viscosity of the admixed components being at a preselected magnitude, said silica sand being in the range of from 10 to 75% by weight of the foamed product, said glass fibers being of a sufficient quantity to increase flexural modulus and impact strength by at least 25% over the flexural modulus and impact strength of the same product with the silica sand and without said glass fibers and with the same density, said silica sand being of a mesh size of from No. 30 U.S. sieve to No. 200 U.S. sieve, said chopped glass fibers being 1/32" to 1" in length with each fiber being comprised of a plurality of filament strands, pouring the admixed components into the mold for foaming.

Claim 12

In a process for manufacturing in a mold a rigid polyurethane foam product having a density of from 10 to 80 lb/ft 3 with said foam being formed from the reaction of an isocyanate component and a polyol component having a highly branched polyol having a molecular weight per branch of approximately 300 to 800 with at least one said component including a suitable blowing agent, the steps comprising: mixing the polyol component and isocyanate component, mixing in silica sand and chopped glass fibers with the viscosity of the admixed components being at a preselected magnitude, said silica sand being in the range of from 10 to 75% by weight of the foamed product, said glass fibers being of a sufficient quantity to increase flexural modulus and impact strength by at least 25% over the flexural modulus and impact strength of the same product with the silica sand and without said glass fibers and with the same density, said silica sand being of a mesh size of from No. 30 U.S. sieve to No. 200 U.S. sieve, said chopped glass fibers being 1/32" to 1" in length with each fiber being comprised of a plurality of filament strands, pouring the admixed components into the mold for foaming.

Claim 13

The process of claim 3 with said chopped fibers being approximately 1/4" in length.

Claim 14

The process of claim 7 with said chopped fibers being 200, 0.00052" diameter, filaments per strand.

Claim 15

The process of claim 4 with said chopped fibers being approximately 1/4" in length.

Claim 16

The process of claim 5 with said chopped fibers being approximately 1/4" in length.

Claim 17

A rigid polyurethane foam product made by a process for manufacturing said product in a mold and having a density of from 10 to 80 lb/ft 3 with said product being formed from the reaction of an isocyanate component and a polyol component having a highly branched polyol having a molecular weight per branch of approximately 300 to 800 with at least one said component including a suitable blowing agent, the steps comprising: heating the polyol component and isocyanate component to a preselected temperature above 74° F, mixing the preheated polyol component and isocyanate component, mixing in silica sand and chopped glass fibers with the viscosity of the admixed components being in the range of from around 1200 cps to around 3600 cps, said chopped glass fibers being in the range of from 3 to 25% by weight of the foamed product, said silica sand being in the range of from 10 to 75% by weight of the foamed product, with the polyurethane being no less than about 20% by weight of the foamed product, said silica sand being of a mesh size of from No. 30 U.S. sieve to No. 200 U.S. sieve, said chopped glass fibers being 1/32" to 1" in length with each fiber being comprised of a plurality of filament strands, heating the mold to a temperature approximately at or above the temperature of the preheated materials, pouring the admixed components into the mold for foaming, said product having a flexural modulus at least 25% higher than a similar product made of the polyurethane alone and a flexural modulus and impact strength at least 25% higher than the combination of polyurethane and 15% silica sand, said product having said chopped glass fibers uniformly distributed throughout with little noticeable effects of air entrapped in processing.

Claim 18

A rigid polyurethane foam product made by a process for manufacturing said product in a mold and having a density of from 10 to 80 lb/ft 3 with said product being formed from the reaction of an isocyanate component and a polyol component having a highly branched polyol having a molecular weight per branch of approximately 300 to 800 with at least one said component including a suitable blowing agent, the steps comprising: heating the polyol component and isocyanate component to a preselected temperature above 74° F, mixing the preheated polyol component and isocyanate component, mixing in silica sand and chopped glass fibers with the viscosity of the admixed components being in the range of from around 1200 cps to around 3600 cps, said chopped glass fibers being in the range of from 3 to 25% by weight of the foamed product, said silica sand being in the range of from 10 to 75% by weight of the foamed product, with the polyurethane being no less than about 20% by weight of the foamed product, said silica sand being of a mesh size of from No. 30 U.S. sieve to No. 200 U.S. sieve, said chopped glass fibers being 1/32" to 1" in length with each fiber being comprised of a plurality of filament strands, heating the mold to a temperature approximately at or above the temperature of the preheated materials, pouring the admixed components into the mold for foaming, said product having a flexural modulus at least 25% higher than a similar product made of the polyurethane alone and a flexural modulus and impact strength at least 25% higher than the combination of polyurethane and 15% silica sand, said product having said chopped glass fibers uniformly distributed throughout with little noticeable effects of air entrapped in processing.

Claim 19

A rigid polyurethane foam product made by a process for manufacturing in a mold a rigid polyurethane foam product having a density of from 10 to 80 lb/ft 3 with said foam being formed from the reaction of an ixocyanate component side and a polyol component having a highly branched polyol having a molecular weight per branch of approximately 300 to 800, the steps comprising: mixing a fluorinated, halogenated saturated aliphetic hydrocarbon solvent blowing agent in the polyol component, said blowing agent having a boiling point greater than around 115° F, heating the polyol component and isocyanate component to a temperature around 115° F, mixing the preheated polyol component and isocyanate component, mixing in silica sand and chopped glass fibers with the viscosity of the admixed components being in the range of from around 1200 cps to 3600 cps, said chopped glass fibers being in the range of from 3 to 25% by weight of the foamed product, said silica sand being in the range of from 10 to 75% by weight of the foamed product, with the polyurethane being no less than about 20% by weight of the foamed product, said silica sand being of a mesh size of from No. 30 U.S. sieve to No. 200 U.S. sieve, said chopped glass fibers being 1/32" to 1" in length with each fiber being comprised of a plurality of filament strands, heating the mold to a temperature approximately at or above the temperature of the preheated materials, pouring the admixed components into the mold for foaming, said product having a flexural modulus at least 25% higher than a similar product made of the polyurethane alone, said product having said chopped glass fibers uniformly distributed throughout with little noticeable effects of air entrapped in processing.

Claim 20

A rigid polyurethane foam product made by a process for manufacturing in a mold a rigid polyurethane foam product having a density of from 10 to 80 lb/ft 3 with said foam being formed from the reaction of an ixocyanate component side and a polyol component having a highly branched polyol having a molecular weight per branch of approximately 300 to 800, the steps comprising: mixing a fluorinated, halogenated saturated aliphetic hydrocarbon solvent blowing agent in the polyol component, said blowing agent having a boiling point greater than around 115° F, heating the polyol component and isocyanate component to a temperature around 115° F, mixing the preheated polyol component and isocyanate component, mixing in silica sand and chopped glass fibers with the viscosity of the admixed components being in the range of from around 1200 cps to 3600 cps, said chopped glass fibers being in the range of from 3 to 25% by weight of the foamed product, said silica sand being in the range of from 10 to 75% by weight of the foamed product, with the polyurethane being no less than about 20% by weight of the foamed product, said silica sand being of a mesh size of from No. 30 U.S. sieve to No. 200 U.S. sieve, said chopped glass fibers being 1/32" to 1" in length with each fiber being comprised of a plurality of filament strands, heating the mold to a temperature approximately at or above the temperature of the preheated materials, pouring the admixed components into the mold for foaming, said product having a flexural modulus at least 25% higher than a similar product made of the polyurethane alone, said product having said chopped glass fibers uniformly distributed throughout with little noticeable effects of air entrapped in processing.

Claim 21

A rigid polyurethane foam product made by a process for manufacturing in a mold a rigid polyurethane foam product having a density of from 10 to 80 lb/ft 3 with said foam being formed from the reaction of an isocyanate component and a polyol component having a highly branched polyol having a molecular weight per branch of approximately 300 to 800 with at least one said component including a suitable blowing agent, the steps comprising: heating the polyol component and isocyanate component to a preselected temperature above 74° F, mixing the preheated polyol component and isocyanate component, mixing in silica sand and chopped glass fibers with the viscosity of the admixed components being in the range of from around 1200 cps to around 3600 cps, said chopped glass fibers being in the range of from 5 to 15% by weight of the foamed product, said silica sand being in the range of from 20 to 60% by weight of the foamed product, with the polyurethane being no less than about 20% by weight of the foamed product, said silica sand being of a mesh size of from No. 30 U.S. sieve to No. 200 U.S. sieve, said chopped glass fibers being 1/32" to 1" in length with each fiber being comprised of a plurality of filament strands, heating the mold to a temperature approximately at or above the temperature of the preheated materials, pouring the admixed components into the mold for foaming, said product having a flexural modulus and impact strength at least 20% higher than a similar product made of the polyurethane alone and at least twice the impact strength of such similar product made of the combination of polyurethane and 15% silica sand, said product having said chopped glass fibers uniformly distributed throughout with little noticeable effects of air entrapped in processing.

Claim 22

A rigid polyurethane foam product made by a process for manufacturing in a mold a rigid polyurethane foam product having a density of from 10 to 80 lb/ft 3 with said foam being formed from the reaction of an isocyanate component and a polyol component having a highly branched polyol having a molecular weight per branch of approximately 300 to 800 with at least one said component including a suitable blowing agent, the steps comprising: heating the polyol component and isocyanate component to a preselected temperature above 74° F, mixing the preheated polyol component and isocyanate component, mixing in silica sand and chopped glass fibers with the viscosity of the admixed components being in the range of from around 1200 cps to around 3600 cps, said chopped glass fibers being in the range of from 5 to 15% by weight of the foamed product, said silica sand being in the range of from 20 to 60% by weight of the foamed product, with the polyurethane being no less than about 20% by weight of the foamed product, said silica sand being of a mesh size of from No. 30 U.S. sieve to No. 200 U.S. sieve, said chopped glass fibers being 1/32" to 1" in length with each fiber being comprised of a plurality of filament strands, heating the mold to a temperature approximately at or above the temperature of the preheated materials, pouring the admixed components into the mold for foaming, said product having a flexural modulus and impact strength at least 20% higher than a similar product made of the polyurethane alone and at least twice the impact strength of such similar product made of the combination of polyurethane and 15% silica sand, said product having said chopped glass fibers uniformly distributed throughout with little noticeable effects of air entrapped in processing.

Claim 23

A rigid polyurethane foam product made by a process for manufacturing in a mold a rigid polyurethane foam product having a density of from 10 to 80 lb/ft 3 with said foam being formed from the reaction of an isocyanate component and a polyol component having a highly branched polyol having a molecular weight per branch of approximately 300 to 800 with at least one said component including a suitable blowing agent, the steps comprising: heating the polyol component and isocyanate component to a preselected temperature above 74° F, mixing the preheated polyol component and isocyanate component, mixing in silica sand and chopped glass fibers, said chopped glass fibers being in the range of from 5 to 15% by weight of the foamed product, said silica sand being in the range of from 20 to 60% by weight of the foamed product, the grains of said silica sand being of a size substantially larger than finely divided silica and having a mesh size of from No. 30 U.S. sieve to No. 200 U.S. sieve, said chopped glass fibers being 1/32" to 1" in length with each fiber being comprised of a plurality of filament strands, pouring the admixed components into the mold for foaming, said product having a flexural modulus and impact strength at least 20% higher than a similar product made of the polyurethane alone and at least twice the impact strength of such similar product made of the combination of polyurethane and 15% silica sand, said product having said chopped glass fibers uniformly distributed throughout with little noticeable effects of air entrapped in processing.

Claim 24

A rigid polyurethane foam product made by a process for manufacturing in a mold a rigid polyurethane foam product having a density of from 10 to 80 lb/ft 3 with said foam being formed from the reaction of an isocyanate component and a polyol component having a highly branched polyol having a molecular weight per branch of approximately 300 to 800 with at least one said component including a suitable blowing agent, the steps comprising: heating the polyol component and isocyanate component to a preselected temperature above 74° F, mixing the preheated polyol component and isocyanate component, mixing in silica sand and chopped glass fibers, said chopped glass fibers being in the range of from 5 to 15% by weight of the foamed product, said silica sand being in the range of from 20 to 60% by weight of the foamed product, the grains of said silica sand being of a size substantially larger than finely divided silica and having a mesh size of from No. 30 U.S. sieve to No. 200 U.S. sieve, said chopped glass fibers being 1/32" to 1" in length with each fiber being comprised of a plurality of filament strands, pouring the admixed components into the mold for foaming, said product having a flexural modulus and impact strength at least 20% higher than a similar product made of the polyurethane alone and at least twice the impact strength of such similar product made of the combination of polyurethane and 15% silica sand, said product having said chopped glass fibers uniformly distributed throughout with little noticeable effects of air entrapped in processing.

Claim 25

A rigid polyurethane foam product made by a process for manufacturing in a mold a rigid polyurethane foam product having a density of from 10 to 80 lb/ft 3 with said foam being formed from the reaction of an isocyanate component and a polyol component having a highly branched polyol having a molecular weight per branch of approximately 300 to 800 with at least one said component including a suitable blowing agent, the steps comprising: mixing the polyol component and isocyanate component, mixing in silica sand and chopped glass fibers with the viscosity of the admixed components being at a preselected magnitude sufficiently high to hold said glass fibers evenly distributed, said chopped glass fibers being in the range of from 3 to 25% by weight of the foamed product, said silica sand being of a preselected quantity to at least assure said viscosity of said preselected magnitude and sufficient to obviate the effects of air entrapped with said glass fibers, the grains of said silica sand being of a size substantially larger than finely divided silica and having a mesh size of from No. 30 U.S. sieve to No. 200 U.S. sieve, said chopped glass fibers being 1/32" to 1" in length with each fiber being comprised of a plurality of filament strands, pouring the admixed components into the mold for foaming, said product having a flexural modulus at least 20% higher than a similar product made of the polyurethane alone and at least twice the impact strength of such similar product made of the combination of polyurethane and 15% silica sand, said product having said chopped glass fibers uniformly distributed throughout with little noticeable effects of air entrapped in processing.

Claim 26

A rigid polyurethane foam product made by a process for manufacturing in a mold a rigid polyurethane foam product having a density of from 10 to 80 lb/ft 3 with said foam being formed from the reaction of an isocyanate component and a polyol component having a highly branched polyol having a molecular weight per branch of approximately 300 to 800 with at least one said component including a suitable blowing agent, the steps comprising: mixing the polyol component and isocyanate component, mixing in silica sand and chopped glass fibers with the viscosity of the admixed components being at a preselected magnitude sufficiently high to hold said glass fibers evenly distributed, said chopped glass fibers being in the range of from 3 to 25% by weight of the foamed product, said silica sand being of a preselected quantity to at least assure said viscosity of said preselected magnitude and sufficient to obviate the effects of air entrapped with said glass fibers, the grains of said silica sand being of a size substantially larger than finely divided silica and having a mesh size of from No. 30 U.S. sieve to No. 200 U.S. sieve, said chopped glass fibers being 1/32" to 1" in length with each fiber being comprised of a plurality of filament strands, pouring the admixed components into the mold for foaming, said product having a flexural modulus at least 20% higher than a similar product made of the polyurethane alone and at least twice the impact strength of such similar product made of the combination of polyurethane and 15% silica sand, said product having said chopped glass fibers uniformly distributed throughout with little noticeable effects of air entrapped in processing.

Claim 27

A rigid polyurethane foam product made by a process for manufacturing in a mold a rigid polyurethane foam product having a density of from 10 to 80 lb/ft 3 with said foam being formed from the reaction of an isocyanate component and a polyol component having a highly branched polyol having a molecular weight per branch of approximately 300 to 800 with at least one said component including a suitable blowing agent, the steps comprising: mixing the polyol component and isocyanate component, mixing in silica sand and chopped glass fibers with the viscosity of the admixed components being at a preselected magnitude, said silica sand being in the range of from 10 to 75% by weight of the foamed product, said glass fibers being of a sufficient quantity to increase flexural modulus by at least 20% over the flexural modulus of the same product without said glass fibers and with the same density, said silica sand being of a mesh size of from No. 30 U.S. sieve to No. 200 U.S. sieve, said chopped glass fibers being 1/32" to 1" in length with each fiber being comprised of a plurality of filament strands, pouring the admixed components into the mold for foaming, said product having a flexural modulus at least 20% higher than a similar product made of the polyurethane alone and at least twice the impact strength of such similar product made of the combination of the polyurethane and 15% silica sand, said product having said chopped glass fibers uniformly distributed throughout with little noticeable effects of air entrapped in processing.

Claim 28

A rigid polyurethane foam product made by a process for manufacturing in a mold a rigid polyurethane foam product having a density of from 10 to 80 lb/ft 3 with said foam being formed from the reaction of an isocyanate component and a polyol component having a highly branched polyol having a molecular weight per branch of approximately 300 to 800 with at least one said component including a suitable blowing agent, the steps comprising: mixing the polyol component and isocyanate component, mixing in silica sand and chopped glass fibers with the viscosity of the admixed components being at a preselected magnitude, said silica sand being in the range of from 10 to 75% by weight of the foamed product, said glass fibers being of a sufficient quantity to increase flexural modulus by at least 20% over the flexural modulus of the same product without said glass fibers and with the same density, said silica sand being of a mesh size of from No. 30 U.S. sieve to No. 200 U.S. sieve, said chopped glass fibers being 1/32" to 1" in length with each fiber being comprised of a plurality of filament strands, pouring the admixed components into the mold for foaming, said product having a flexural modulus at least 20% higher than a similar product made of the polyurethane alone and at least twice the impact strength of such similar product made of the combination of the polyurethane and 15% silica sand, said product having said chopped glass fibers uniformly distributed throughout with little noticeable effects of air entrapped in processing.

Claim 29

The product of claim 13 with said chopped fibers being approximately 1/4" in length.

Claim 30

The product of claim 17 with said chopped fibers being 200, 0.00052" diameter, filaments per strand.

Claim 31

The product of claim 14 with said chopped fibers being approximately 1/4" in length.

Claim 32

The product of claim 15 with said chopped fibers being approximately 1/4" in length.