Polycarbonate with reduced color
US7645851B2 · kind B2 · utility
7Cited by
33References
61Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 20, 2007 |
| Grant date | Jan 12, 2010 |
| Priority date | — |
| Expiry date | Jan 22, 2028 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/49
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method of making polycarbonate includes the steps of forming polycarbonate by a melt transesterification method using an activated diaryl carbonate, and compounding the polycarbonate with a phosphorus-containing compound that has an abstractable proton or hydrolyzable group. The phosphorus-containing compound is compounded with the polycarbonate in an amount sufficient to result in an improvement in the color properties of the polycarbonate as compared to pellets formed from the same polycarbonate without addition of the phosphorus-containing compound.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.