Unsaturated polyester resin compositions

Claim 2

The process of claim 2, wherein said polycarboxylic acid is at least one member selected from the group consisting of maleic and fumaric acid, wherein said polyhydroxy alcohol is at least one member selected from the group consisting of ethylene glycol, propylene glycol and pentaerythritol, wherein said polycarboxylic acid is reacted with said polyhydroxy alcohol in a molar ratio of from 0.3:1 to 0.5:1 in the presence of a phthalic acid wherein the molar ratio between said polycarboxylic acid and said phthalic acid is from 0.5:1 to 2:

Claim 3

The process of claim 3, wherein the temperature during polycondensation reaction varies from 160* to 200* C.

Claim 4

The process of claim 3, wherein said hardening catalyst comprises a peroxide which decomposes at high temperature.

Claim 5

The process of claim 5, wherein said peroxide is selected from the group consisting of cumene hydroperoxide, ditertiary butyl perbenzoate, dicumyl peroxide and tertiary butyl peroxide.

Claim 6

The process of claim 3, wherein said inert filler is selected from the group consisting of carbonates, sulfates, kaolin, quartz, slate, titanium dioxide, mica and talcum.

Claim 7

The process of claim 3, further comprising adding during said step (c), with stirring, not more than 5 weight percent, based upon the weight of the whole composition, of at least one member selected from the group consisting of a hardening activator, a lubricant and other coNventional additives.

Claim 8

The process of claim 3, wherein said composition achieves a viscosity during said step (e) of above 300,000 cps.

Claim 9

The process of claim 3, further comprising adding to said composition, during step (e), glass fibers which are impregnated during said step (e) by said composition undergoing the increase in viscosity.

Claim 10

A non-tacky and non-water-absorbing unsaturated polyester resin composition having improved resistance to atmospheric agents consisting essentially of: 50 to 60 parts by weight of an unsaturated polyester resin having an acidity number of from 30 to 35 and a Gardner viscosity, measured at room temperature and in 70 percent toluene, of from Z3 to Z5, said unsaturated polyester resin being diluted with a quantity of styrene to produce a diluted resin having a viscosity, measured at 25* C. with a Hubbelhode viscosimeter, of from 500 to 2,000 cps; 40 to 50 parts by weight of inert filler; 0.5 to 3 parts by weight per 100 parts by weight of said unsaturated polyester resin of a hardening catalyst; and not more than 1 part by weight of magnesium oxide, said composition being produced by a process which comprises; a. forming said unsaturated polyester resin by a polycondensation reaction of an unsaturated polycarboxylic acid with a polyhydroxy alcohol in the presence of a saturated acid; b. diluting the resulting resin with styrene to produce said viscosity after cooling the resin to at least 100* C.; c. adding to the styrene-diluted resin said inert filler and said hardening catalyst; d. adding to the resulting product said magnesium oxide, the magnesium oxide added during this step being all of the magnesium that is added to the composition during preparation; and e. allowing the resulting product to stand at room temperature for not more than 2 hours wherein the viscosity of the resulting composition increases to above 100,000 cps.

Claim 11

The polyester resin composition of claim 11, wherein the viscosity of said composition is greater than 300,000 cps.

Claim 12

The polyester resin composition of claim 11, wherein said unsaturated polyester resin is obtained by a polycondensation reaction at a temperature of from 160* to 200* C. between from 0.3 to 0.6 moles, per mole of polyhydroxy alcohol, at least one polycarboxylic acid selected from the group consisting of maleic and fumaric acids and at least one polyhydroxy alcohol selected from the group consisting of ethylene glycol, propylene glycol and pentaerythritol, said polycondensation reaction being conducted in the presence of a phthalic acid with the molar ratio between said polycarboxylic acid and said phthalic acid being from 0.5:1 to 2:1.

Claim 13

The polyester resin composition of claim 13 wherein said hardening catalyst comprises a peroxide that decomposes at high temperature.

Claim 14

The polyester resin composition of claim 14 wherein said peroxide is selected from the group consisting of cumene hydroperoxide, ditertiary butyl perbenzoate, dicumyl peroxide and tertiary butyl peroxide.

Claim 15

The polyester resin composition of claim 13, wherein said inert filler is selected from the group consisting of carbonates, sulfates, kaolin, quartz, slate, titanium dioxide, mica and talcum.

Claim 16

The polyester resin composition of claim 13, which further contains not more than 5 parts weight, based upon the weight of the entire composition, of at least one member selected from the group consisting of a hardening activator, a lubricant and other conventional additives.