Spectacle Lens and Polycarbonate Resin Molding Material for Optical Moldings
First Claim
1. 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-benzotriazol)-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.
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Accused Products
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.
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Citations
16 Claims
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1. 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-benzotriazol)-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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
- -hydroxy-5′
-
15. A polycarbonate resin molding material for optical moldings, 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-benzotriazol)-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.
- -hydroxy-5′
-
16. A polycarbonate resin molding material for optical moldings, which comprises (1) 100 parts by weight of a polycarbonate resin, (2) 0.05 to 0.5 part by weight of 2-(2′
- -hydroxy-5′
-tert-octylphenyl)benzotriazole, (3) 0.01 to 0.3 part by weight of 2,2′
-methylenebis[4-(1,1,3,3-tetramethylbutyl)-6-(2H-benzotriazol)-2-ylphenol], (4) 0.01 to 0.5 part by weight of (C) a full ester of pentaerythritol and a mixed aliphatic carboxylic acid of palmitic acid and stearic acid, having an acid value of 4 to 20, and (5) 0.001 to 0.2 part by weight of a phosphorus-based heat stabilizer.
- -hydroxy-5′
Specification