High strength, reduced heat distortion temperature thermoplastic

Details High strength, reduced heat distortion temperature thermoplastic High strength, reduced heat distortion temperature thermoplastic

1986-03-25

1988-11-22

Short, Patricia

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525148, 525 92, 524537, C08L 6702, C08L 6900

Patent

active

047866926

ABSTRACT:
New and improved thermoplastic compositions are disclosed comprising a blend of an aromatic polycarbonate and a copolymer derived from a glycol portion comprising 1,4-cyclohexanedimethanol and ethylene glycol present in molar ratios of 1:4 to 4:1 respectively and an acid portion comprising an aromatic dicarboxylic acid selected from terephthalic acid, isophthalic acid, and mixtures thereof. The compositions are compatible with, and advantageously contain impact modifiers and flame retardants. The copolymer of the subject invention has a heat distortion temperature of from 60.degree. C. to 70.degree. C. and when incorporated in the thermoplastic compositions of this invention provides polycarbonate-based compositions which exhibit lower heat distortion temperatures while retaining good tensile, flexural and impact strengths.
The lower heat distortion temperatures of the compositions permits them to be molded and processed at lower temperatures thereby avoiding the degradation of the materials with concomitant loss in impact strength observed with higher conventional molding temperatures employed with earlier compositions.

REFERENCES:
patent: 4188314 (1980-02-01), Fox
patent: 4267096 (1981-05-01), Bussink
patent: 4352907 (1982-10-01), Lee
Research Disclosure, May 1983, pp. 182-183.

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