Teijin Chemicals Limited

Jiro Ariki

Seiichi Tanabe

Moritoshi Matsumoto

Keizo Ikari

A resin composition which contains polycarbonate resin, does not transmit a wavelength of 385 nm substantially and has a high total light transmittance and excellent heat resistance. The resin composition comprises (1) polycarbonate resin, (2) an ultraviolet absorber (A) such as 2-(2H-benzotriazol-2-yl)-p-cresol, (3) an ultraviolet absorber (B) such as 2,2'-methylenebis[4-(1,1,3,3-tetramethylbutyl)-6-(2H-benzotriazol-2-yl)phenol] and (4) at least one compound (C) represented by the following formula (I) or (II) and is used for spectacle lenses.(R&#x2014;S&#x2014;CH&#x2014;CH&#x2014;C(O)O&#x2014;CH&#x2014;)C&#x2003;&#x2003;(I)(R&#x2014;O&#x2014;C(O)&#x2014;CH&#x2014;CH&#x2014;)S&#x2003;&#x2003;(II)(wherein Ris an alkyl group having 4 to 20 carbon atoms, and Ris an alkyl group having 6 to 22 carbon atoms.)

Spectacle lens

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&#x2032;-methylphenyl)benzotriazole and 2-(2&#x2032;-hydroxy-5&#x2032;-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&#x2032;-methylenebis[4-(1,1,3,3-tetramethylbutyl)-6-(2H-benzotraizole)-2-ylphenol] and 2-[2-hydroxy-3,5-bis(&#x3b1;,&#x3b1;-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.

Spectacle lens and polycarbonate resin molding material for optical moldings

A spectacles lens and an optical transparent molded article are provided that are formed from a polycarbonate resin composition comprising:

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Chiyoda-ku, Japan

Jiro Ariki