Decolorization of polycarbonate resins
US4377684A · kind A · utility
12Cited by
0References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 8, 1982 |
| Grant date | Mar 22, 1983 |
| Priority date | — |
| Expiry date | Feb 8, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G64/406
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Polycarbonate resins which have been polymerized employing titanates as polymerizing agents generally have characteristic undesirable color. Removal of this color is accomplished by treatment of the polycarbonate resin with a quantity of an organic acid anhydride, optionally employing a smaller amount of a mineral acid, in addition for lower temperature decolorization.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.