Polycarbonate processing
US4487874A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 14, 1983 |
| Grant date | Dec 11, 1984 |
| Priority date | — |
| Expiry date | Apr 14, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L69/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The lubricant which is incorporated into the polycarbonate resin is a complex ester formed by partial esterification of pentaerythritol with a C.sub.5 to C.sub.9 aliphatic carboxylic acid followed by reaction with a C.sub.4 to C.sub.8 aliphatic dicarboxylic acid to form a material represented by the structural formula: EQU [RCO.sub.2 CH.sub.2 ].sub.3 CCH.sub.2 O[CO(CH.sub.2).sub.x CO.sub.2 CH.sub.2 C(CH.sub.2 O.sub.2 CR).sub.2 CH.sub.2 O].sub.y --CO(CH.sub.2).sub.x CO.sub.2 CH.sub.2 C[CH.sub.2 O.sub.2 CR].sub.3 wherein the above formula y has an average value of from 3 through 12; x has a value of 2 to 6 and R is an aliphatic hydrocarbon group of from 5 to 9 carbon atoms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.