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Lens for glasses and process for producing the same

Inactive Publication Date: 2007-02-07
TEIJIN CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This composition has improved comprehensive properties of hydrolysis resistance, impact resistance, and mold contamination, but its hue is insufficient. If heat history is applied such as re-extrusion, the hue will change greatly, and the molding heat resistance is also insufficient.

Method used

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  • Lens for glasses and process for producing the same
  • Lens for glasses and process for producing the same
  • Lens for glasses and process for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] 2-(2'-Hydroxy-5' -0.3 parts of tert-octylphenyl)benzotriazole (maximum absorption is 340nm), add 2,2'-methylenebis[4-(1,1,3,3- Tetramethylbutyl)-6-(2H-benzotriazol-2-yl)phenol] (maximum absorption is 349nm) 0.04 parts, add 5,7-di-tert-butyl- 3-(3,4-dimethylphenyl)-3H-benzofuran-2-one (in the aforementioned formula (1), R 1 is a hydrogen atom, R 2 is 3,4-dimethylphenyl, R 3 and R 4 0.0027 parts of a compound represented by a tert-butyl group), 0.25 parts of stearyl stearate (release agent), 0.03 parts of the following phosphorus-based stabilizer (e) and a compound represented by the following formula as a bluing agent 0.5ppm,

[0084]

[0085] After fully mixing with a roller, granulate (new raw material pellets) at 260-280° C. with a 30 mm vented extrusion molding machine. In order to study the hue of the recycled raw material pellets, the re-granulated pellets were obtained by performing two consecutive granulations under the same extrusion conditions. These ...

Embodiment 2

[0091] Change the amount of 5,7-di-tert-butyl-3-(3,4-dimethylphenyl)-3H-benzofuran-2-one in Example 1 to 0.01 parts, except The same operation as in Example 1 was carried out to obtain a sample plate, and the evaluation results are shown in Table 1.

Embodiment 3

[0093] Change the addition amount of 5,7-di-tert-butyl-3-(3,4-dimethylphenyl)-3H-benzofuran-2-one in Example 1 to 0.05 parts, in addition The same operation as in Example 1 was carried out to obtain a sample plate, and the evaluation results are shown in Table 1.

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Abstract

A spectacles lens and an optical transparent molded article are provided that are formed from a polycarbonate resin composition comprising: (1) 100 parts by weight of polycarbonate resin (A), (2) 0.05 to 0.5 parts by weight of at least one ultraviolet absorber (B) selected from the group consisting of 2-(2'-hydroxy-5'-methylphenyl)benzotriazole (B-1) and 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole (B-2), (3) 0.01 to 0.3 parts by weight of at least one ultraviolet absorber (C) selected from the group consisting of 2-(3-tert-butyl-5-methyl-2-hydroxyphenyl)-5-chlorobenzotriazole (C-1), 2,2'-methylenebis[4-(1,1,3,3-tetramethylbutyl)-6-(2H-benzotriazole)-2-ylphenol] (C-2) and 2-[2-hydroxy-3,5-bis(+-,+--dimethylbenzyl)phenyl]-2H-benzotriazole (C-3), and (4) 0.0005 to 0.1 parts by weight of lactone compound having a specific structure.

Description

technical field [0001] The present invention relates to eyeglasses made of a polycarbonate resin composition that is excellent in transparency and ultraviolet absorption performance, good in molding heat resistance, high in reproducibility (rip portability), hardly yellows even if it has a heat history, and excellent in hue Lenses and methods for their manufacture. [0002] The term "recyclability" here refers to the property that the color of the resin changes little even when heat history such as re-extrusion is applied in order to reuse polycarbonate resin molded products or their molding waste. That is, even if a thermal history is applied to a resin product (or its waste), there is little reduction in hue, and the molded product can be reused. [0003] The present invention also relates to a polycarbonate resin molding material for optics that is excellent in transparency and ultraviolet absorption performance, and hardly yellows. Background technique [0004] Polycar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02C7/02C08K5/13C08K5/1535C08K5/52C08L69/00C08K5/3435G02B1/04
CPCC08K5/3435C08K5/1535G02B1/041C08L69/00
Inventor 井狩圭造有木次郎
Owner TEIJIN CHEM LTD
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