Weatherable, thermostable polymers having improved flow composition
US6861482B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 2, 2002 |
| Grant date | Mar 1, 2005 |
| Priority date | — |
| Expiry date | Dec 2, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31565
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention describes the incorporation of several types of soft-block materials into resorcinol phthalate-co-polycarbonate polymers. In preferred embodiments, the soft-block materials contain aliphatic moieties or silicones as flexibilizing units. Several methods of incorporation into the copolymer structure are described including co-reaction of diols with iso/terephthaloyl chloride, replacement of the normal chainstopper with a p-alkylphenol, replacement of a portion of the bisphenol A with an aliphatic ester-bisphenol, and co-reaction of aliphatic diacid chlorides. The polymers of the present invention have good flow characteristics at temperatures generally used for coating, and have good thermostability and weatherability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.