Method of coloring polycarbonate extruded or molded products for optical members
US5116547A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jul 20, 1990 |
| Grant date | May 26, 1992 |
| Priority date | — |
| Expiry date | Jul 20, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2491/00
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method of coloring a polycarbonate extruded or molded product for optical members, which is colored by a liquid coloring process for obtaining a colored polycarbonate extruded or molded product for optical members by extrusion or injection molding. The process involves mixing a polycarbonate resin for optical members and a liquid coloring agent dispersion obtained by dispersing a coloring agent in a dispersing agent. The dispersing agent includes a specific saturated fatty acid ester or silicon oil. After mixing the polycarbonate resin and liquid coloring agent dispersion, the resulting mixture is melted and thereafter extruded or molded to form a product for optical members.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.