US4263409A — Process for the production of a foamed thermoplas…

Claim 1

Independent Claim 103 words

A process for the production of an injection moldable foamed thermoplastic composition which consists essentially of blending from about 0.10 to about 5.0 weight percent based on the weight of resin of a chemical foaming agent containing a decomposable group selected from azo, N-nitroso, carboxylate, carbonate, heterocyclic nitrogen containing and sulfonyl hydrazide groups with a thermoplastic resin selected from the group consisting of an aromatic polycarbonate; a saturated polyester, a polyphenylene ether and a mixture thereof with a polystyrene resin, extruding at an elevated constant temperature below the decomposition temperature of said resin and comminuting the resultant extrudate into pellets or molding granules.

Claim 2

Dependent Claim 103 words

A process for the production of an injection moldable foamed thermoplastic composition which consists essentially of blending from about 0.10 to about 5.0 weight percent based on the weight of resin of a chemical foaming agent containing a decomposable group selected from azo, N-nitroso, carboxylate, carbonate, heterocyclic nitrogen containing and sulfonyl hydrazide groups with a thermoplastic resin selected from the group consisting of an aromatic polycarbonate; a saturated polyester, a polyphenylene ether and a mixture thereof with a polystyrene resin, extruding at an elevated constant temperature below the decomposition temperature of said resin and comminuting the resultant extrudate into pellets or molding granules.

Claim 3

Dependent Claim 21 words

The process of claim 1 wherein the polycarbonate is an aromatic carbonate polymer of a dihydric phenol and a carbonate precursor.

Claim 4

Dependent Claim 18 words

The process of claim 2 wherein the aromatic carbonate polymer is a reaction product of bisphenol-A and phosgene.

Claim 5

Dependent Claim 19 words

The process of claim 1 wherein the polyester is the reaction product of a dicarboxylic acid and a diol.

Claim 6

Dependent Claim 12 words

The process of claim 4 wherein the polyester is a poly(butylene terephthalate).

Claim 7

Dependent Claim 21 words

The process of claim 1 wherein the thermoplastic resin is a blend of a polyphenylene ether resin and a styrene resin.

Claim 8

Dependent Claim 27 words

The process of claim 1 wherein the thermoplastic resin contains a filler selected from the group consisting of fibrous glass or a mineral or a mixture thereof.

Claim 9

Dependent Claim 14 words

The process of claim 1 wherein the thermoplastic resin contains a flame retardant additive.

Claim 10

Dependent Claim 72 words

The process of claim 8 wherein said flame retardant additive is a halogen-containing compound, a halogen-containing compound in admixture with an antimony compound; elemental phosphorus or a phosphorus compound; a halogen-containing compound in admixture with a phosphorus compound; a compound containing phosphorus-nitrogen bonds; or a mixture of the foregoing, and said compound is present in an amount of from about 0.5 to about 50 weight percent based on the weight of resin.

Claim 11

Dependent Claim 14 words

The process of claim 1 wherein the thermoplastic resin contains an impact enhancing additive.

Claim 12

Dependent Claim 42 words

The process of claim 10 wherein said impact enhancing additive is selected from the group consisting of polyethylene, polypropylene, polyisobutylene, a copolymer of ethylene and an alkyl acrylate, a copolymer of ethylene and propylene, a polyurethane elastomer, and an organopolysiloxane polycarbonate polymer.

Claim 13

Dependent Claim 113 words

A process for the production of an injection moldable foamed thermoplastic composition which consists essentially of blending from about 0.10 to about 5.0 weight percent based on the weight of resin of a chemical foaming agent selected from the group consisting of dinitrosopentamethylene tetramine, p-toluene sulfonyl semicarbazide, 5-phenyltetrazole, calcium oxalate, trihydrazine-s-triazine, azodicarbonamide, and mixtures thereof, with a thermoplastic resin selected from the group consisting of an aromatic polycarbonate, a saturated polyester consisting of an aromatic polycarbonate, a saturated polyester, a polyphenylene ether and a mixture thereof with a polystyrene resin, extruding at an elevated constant temperature below the decomposition temperatures of said resin and comminuting the resultant extrudate into pellets or molding granules.

Claim 14

Dependent Claim 113 words

A process for the production of an injection moldable foamed thermoplastic composition which consists essentially of blending from about 0.10 to about 5.0 weight percent based on the weight of resin of a chemical foaming agent selected from the group consisting of dinitrosopentamethylene tetramine, p-toluene sulfonyl semicarbazide, 5-phenyltetrazole, calcium oxalate, trihydrazine-s-triazine, azodicarbonamide, and mixtures thereof, with a thermoplastic resin selected from the group consisting of an aromatic polycarbonate, a saturated polyester consisting of an aromatic polycarbonate, a saturated polyester, a polyphenylene ether and a mixture thereof with a polystyrene resin, extruding at an elevated constant temperature below the decomposition temperatures of said resin and comminuting the resultant extrudate into pellets or molding granules.

Claim 15

Dependent Claim 119 words

A process for the production of a molded thermoplastic composition which consists essentially of the steps of: (a) admixing from about 0.10 to about 5.0 weight percent based on the weight of resin of a chemical foaming agent containing a decomposable group selected from azo, N-nitroso, carboxylate, carbonate, heterocyclic nitrogen containing and sulfonyl hydrazide groups with a thermoplastic resin selected from the group consisting of an aromatic polycarbonate, a saturated polyester, a polyphenylene ether and mixture thereof with a polystyrene resin; (b) extruding the admixture from step (b) at an elevated constant temperature below the decomposition temperature of said resin; (c) comminuting the resultant extrudate to produce injection moldable particles; and (d) injection molding the particles from step (c).

Claim 16

Dependent Claim 119 words

A process for the production of a molded thermoplastic composition which consists essentially of the steps of: (a) admixing from about 0.10 to about 5.0 weight percent based on the weight of resin of a chemical foaming agent containing a decomposable group selected from azo, N-nitroso, carboxylate, carbonate, heterocyclic nitrogen containing and sulfonyl hydrazide groups with a thermoplastic resin selected from the group consisting of an aromatic polycarbonate, a saturated polyester, a polyphenylene ether and mixture thereof with a polystyrene resin; (b) extruding the admixture from step (b) at an elevated constant temperature below the decomposition temperature of said resin; (c) comminuting the resultant extrudate to produce injection moldable particles; and (d) injection molding the particles from step (c).

Claim 17

Dependent Claim 122 words

A process for the production of a molded thermoplastic composition which consists essentially of the steps of: (a) admixing from about 0.10 to about 5.0 weight percent based on the weight of resin of a chemical foaming agent selected from the group consisting of dinitrosopentamethylene tetramine, p-toluene sulfonyl semicarbazide, 5-phenyltetrazole, calcium oxalate, trihydrazino-s-triazine, azodicarbonamide, and mixtures thereof, with a thermoplastic resin selected from the group consisting of an aromatic polycarbonate, a saturated polyester, a polyphenylene ether and a mixture thereof with a polystyrene resin; (b) extruding the admixture from step (b) at an elevated constant temperature below the decomposition temperature of said resin; (c) comminuting the resultant extrudate to produce injection moldable particles; and (d) injection molding the particles from step (c).

Claim 18

Dependent Claim 122 words

A process for the production of a molded thermoplastic composition which consists essentially of the steps of: (a) admixing from about 0.10 to about 5.0 weight percent based on the weight of resin of a chemical foaming agent selected from the group consisting of dinitrosopentamethylene tetramine, p-toluene sulfonyl semicarbazide, 5-phenyltetrazole, calcium oxalate, trihydrazino-s-triazine, azodicarbonamide, and mixtures thereof, with a thermoplastic resin selected from the group consisting of an aromatic polycarbonate, a saturated polyester, a polyphenylene ether and a mixture thereof with a polystyrene resin; (b) extruding the admixture from step (b) at an elevated constant temperature below the decomposition temperature of said resin; (c) comminuting the resultant extrudate to produce injection moldable particles; and (d) injection molding the particles from step (c).

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1984-04-20	1984-10-20	1985-04-21	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1988-04-20	1988-10-20	1989-04-21	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1992-04-20	1992-10-20	1993-04-21	$7700.00	Window Closed / Lapsed

Process for the production of a foamed thermoplastic composition

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