The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 31, 2010
Filed:
Oct. 28, 2005
Jiro Ariki, Chiyoda-ku, JP;
Seiichi Tanabe, Chiyoda-ku, JP;
Jiro Ariki, Chiyoda-ku, JP;
Seiichi Tanabe, Chiyoda-ku, JP;
Teijin Chemicals Ltd., Tokyo, JP;
Abstract
A spectacle lens made of a polycarbonate resin composition which comprises (1) 100 parts by weight of a polycarbonate resin, (2) 0.05 to 0.5 part by weight of (A) at least one ultraviolet light absorber selected from the group consisting of 2-(2'-hydroxy-5′-methylphenyl)benzotriazole and 2-(2′-hydroxy-5′-tert-octylphenyl)benzotriazole, (3) 0.01 to 0.3 part by weight of (B) at least one ultraviolet light absorber selected from the group consisting of 2-(3-tert-butyl-5-methyl-2-hydroxyphenyl)-5-chlorobenzotriazole, 2,2′-methylenebis[4-(1,1,3,3-tetramethylbutyl)-6-(2H-benzotraizole)-2-ylphenol] and 2-[2-hydroxy-3,5-bis(α,α-dimethylbenzyl)phenyl]-2H-benzotriazole, and (4) 0.01 to 0.5 part by weight of (C) a full ester of a tetravalent to octavalent aliphatic polyhydric alcohol having 5 to 30 carbon atoms and an aliphatic carboxylic acid having 10 to 22 carbon atoms, having an acid value of 4 to 20. According to the present invention, the spectacle lens made of the above polycarbonate resin composition has molding heat resistance which enables it to be kept at a high temperature for a long time when the lens is formed by extrusion compression molding, a small change in hue when heat history such as re-extrusion is applied so as to recycle product waste and excellent releasability.