Injection moldable poly(ethylene terephthalate)
First Claim
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1. In a molding composition comprisinga. a thermoplastic, saturated, linear polyester of terephthalic acid,b. a plasticizing material andc. a crystal nucleating agent, the improvement which consists in using as the nucleating agent a powdered crystalline metal hydroxide of grain size not exceeding 45 microns, selected from the group of hydrated aluminum hydroxide containing 30±
- 5% water of hydration, nickel hydroxide, indium hydroxide and copper hydroxide in an amount sufficient to increase the crystallization temperature of an article molded from the polyester composition by at least about 15°
C. with regard to that of the mixture of a and b.
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Abstract
A molding composition of a terephthalate polyester such as PET, a plasticizing material and a crystal nucleating agent. The nucleating agent is a powdered metal hydroxide such as aluminum hydroxide, which raises the Tcc of the composition and permits reduced cycling time and enables higher molecular weight polymer to be used in the molding process.
13 Citations
15 Claims
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1. In a molding composition comprising
a. a thermoplastic, saturated, linear polyester of terephthalic acid, b. a plasticizing material and c. a crystal nucleating agent, the improvement which consists in using as the nucleating agent a powdered crystalline metal hydroxide of grain size not exceeding 45 microns, selected from the group of hydrated aluminum hydroxide containing 30± - 5% water of hydration, nickel hydroxide, indium hydroxide and copper hydroxide in an amount sufficient to increase the crystallization temperature of an article molded from the polyester composition by at least about 15°
C. with regard to that of the mixture of a and b. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
- 5% water of hydration, nickel hydroxide, indium hydroxide and copper hydroxide in an amount sufficient to increase the crystallization temperature of an article molded from the polyester composition by at least about 15°
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15. In the process of producing shaped articles of high surface quality and gloss by cooling in a mold a molten thermoplastic polyester composition comprising:
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a. a polyester of terephthalic acid with diol selected from the group of ethanediol, 1,4-butanediol, and hexanediol and 1,4-cyclohexanedimethanol or mixtures or copolymers thereof, b. a plasticizing material and c. a nucleating agent, the improvement which comprises using as the nucleating agent a powdered crystalline metal hydroxide of grain size not exceeding 45 microns, selected from the group of hydrated aluminum hydroxide containing 30±
5% water of hydration, nickel hydroxide, indium hydroxide and copper hydroxide in an amount sufficient to increase the crystallization temperature of the polyester composition by at least about 15°
C. with regard to the mixture of a and b.
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Specification