Thermoplastic polycarbonate compositions with improved optical surface quality, articles made therefrom and method of manufacture
US7358293B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 31, 2005 |
| Grant date | Apr 15, 2008 |
| Priority date | — |
| Expiry date | Jul 26, 2026 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L55/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A thermoplastic composition contains a polycarbonate resin, an aromatic vinyl copolymer, an impact modifier and a mineral filler, wherein the composition has a lightness L* of greater than or equal to about 70 under one or more of CIE D65, CWF-2 or C illumination using a 2° observer at 360 to 750 nanometers (nm), including specular components. Alternatively, a thermoplastic composition may contain a polycarbonate resin, a vinyl aromatic copolymer, an impact modifier and a mineral filler, and less than or equal to about 400 parts per million iron, by weight of the composition. An article may be formed by molding, extruding, shaping or forming such a composition to form the article.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.