High strength, reduced heat distortion temperature thermoplastic composition
US4786692A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 25, 1986 |
| Grant date | Nov 22, 1988 |
| Priority date | — |
| Expiry date | Mar 25, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L67/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.