摘要:
Eyeglass lenses made from 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 at least one ultraviolet absorber (A) selected from the group consisting of 2-(2'-hydroxy-5' -methylphenyl)benzotriazole and 2-(2'-hydroxy-5'-tert-octyl- phenyl)benzotriazole, (3) 0.01 to 0.3 part by weight of at least one ultraviolet absorber (B) selected from the group consisting of 2-(3-tert-butyl-5-methyl-2-hydroxyphenyl)-5-chlorobenzo- triazole, 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 a full ester (C) which is made from a tetra- to octa-hydric aliphatic C5-30 alcohol and an aliphatic C10-22 carboxylic acid and which has an acid value of 4 to 20. The polycarbonate resin composition has satisfactory heat resistance to withstand the long-term exposure to high -temperature conditions employed in molding lenses by extrusion compression molding or the like and causes little hue change even when has undergone a thermal history (such as re-extrusion) for the re-use of scrap. Further, the composition can give polycarbonate resin eyeglass lenses with excellent mold release characteristics.
摘要:
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.
摘要:
It is an object of the present invention to provide a styrene type resin composition excellent in thermal stability, hue, fluidity, and heat resistance, and also having the flame retardant performance, and a molded product excellent in outward appearance, formed therefrom. The present invention provides a flame retardant styrene type resin composition comprising (A) a styrene type resin (component A) in an amount of 100 parts by weight, (B) a polyphenylene ether type resin (component B) in an amount of 0 to 100 parts by weight, and (C) an organophosphorus compound (component C) represented by the following formula (1) in an amount of 1 to 100 parts by weight, characterized in that the organophosphorus compound (component C) satisfies:
(i) the weight loss residue on heating at 500°C is 10% or less; (ii) the HPLC purity is 90% or more, and (iii) the acid value is 0.5 mg KOH/g or less
(where in the formula, Ar 1 and Ar 2 may be the same or different, and is a phenyl group which may have a substituent.)