Method of coloring polycarbonate extruded or molded products for optical members
AssigneesMitsubishi Gas Chemical Company, Inc., Victor Company of Japan, Ltd.
InventorsShuji Tsukahara, Toshikazu Umemura, Kazuyoshi Ichise
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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.
Claims15
A method of coloring a polycarbonate extruded or molded product for optical members, which is colored by a liquid coloring process for obtaining a polycarbonate extruded or molded product for optical members, colored with a coloring agent, in an extruder or injection molding machine that extrudes or molds a polycarbonate resin for optical members;
- said process comprising mixing a polycarbonate resin for optical members and a liquid coloring agent dispersion obtained by dispersing a coloring agent in a dispersing agent, thereafter melting said resin and said dispersion, and subsequently forming a colored extruded or molded product for optical members wherein;
- said liquid coloring agent dispersion comprises a coloring agent comprising at least one of a dye and a pigment, and a dispersing agent comprising a saturated fatty acid ester comprising a full ester of a straight-chain or branched saturated monobasic fatty acid having 4 to 35 carbon atoms with a saturated monohydric or polyhydric alcohol having 2 to 35 carbon atoms;
- and
- said liquid coloring agent dispersion is used in an amount of from 0.05 to 2 parts by weight based on said polycarbonate resin for optical members.
Dependencies are inferred from the claim text.