SPECTACLE LENS

• US 20100029812A1
• Filed: 12/04/2007
• Published: 02/04/2010
• Est. Priority Date: 12/06/2006
• Status: Active Grant

• Current Assignee: Teijin Chemicals Ltd. (Teijin Limited)
• Original Assignee: Teijin Chemicals Ltd. (Teijin Limited)
• Inventors: Matsumoto, Moritoshi, Ariki, Jiro, Tanabe, Seiichi
• Granted Patent: US 7,863,354 B2
• Time in Patent Office: Days
• US Class Current: 524/91
• CPC Class Codes: C08K 5/005 Stabilisers against oxidation, heat, light, ozone
• CPC Class Codes: C08K 5/3475 condensed with carbocyclic rings
• CPC Class Codes: C08K 5/372 Sulfides , e.g. R-(S)x-R'
• CPC Class Codes: C08L 69/00 Compositions of polycarbonates; Compositions of derivatives of polycarbonates
• CPC Class Codes: G02B 1/041 Lenses

Abstract

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.

(R¹—S—CH₂—CH₂—C(O)O—CH₂—)₄C  (I)

(R²—O—C(O)—CH₂—CH₂—)₂S  (II)

(wherein R¹ is an alkyl group having 4 to 20 carbon atoms, and R² is an alkyl group having 6 to 22 carbon atoms.)

Claims

1. A resin composition comprising (1) 100 parts by weight of polycarbonate resin, (2) 0.05 to 0.4 part by weight of at least one ultraviolet absorber (A) selected from the group consisting of 2-(2H-benzotriazol-2-yl)-p-cresol and 2-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol, (3) 0.01 to 0.3 part by weight of at least one ultraviolet absorber (B) selected from the group consisting of 2-[5-chloro(2H)-benzotriazol-2-yl]-4-methyl-6-(tert-butyl)phenol, 2,2′

-methylenebis[4-(1,1,3,3-tetramethylbutyl)-6-(2H-benzotriazol-2-yl)phenol] and 2-(2H-benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl)phenol, and (4) 0.01 to 0.5 part by weight of at least one thioether-based compound (C) selected from the group consisting of a compound represented by the following formula (I) and a compound represented by the following formula (II).

(R¹—

S—

CH₂—

CH₂—

C(O)O—

CH₂—

)₄C 

 

(I)

(R²—

O—

C(O)—

CH₂—

CH₂—

)₂S 

 

(II)

(wherein R¹ is an alkyl group having 4 to 20 carbon atoms, and R² is an alkyl group having 6 to 22 carbon atoms.)

2. The resin composition according to claim 1, wherein the ultraviolet absorber (A) is 2-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol and the ultraviolet absorber (B) is at least one selected from the group consisting of 2-[5-chloro(2H)-benzotriazol-2-yl]-4-methyl-6-(tert-butyl)phenol and 2,2′

-methylenebis[4-(1,1,3,3-tetramethylbutyl)-6-(2H-benzotriazol-2-yl)phenol].

3. The resin composition according to claim 1, wherein the mixing ratio (R) of the ultraviolet absorber (A) and the ultraviolet absorber (B) is 0.05 to 4 in terms of B/A weight ratio.

4. The resin composition according to claim 1, wherein the thioether-based compound (C) is pentaerythritol tetrakis(3-laurylthiopropionate).

5. The resin composition according to claim 1 which comprises a phosphorus-based heat stabilizer (D) in an amount of 0.001 to 0.2 part by weight based on 100 parts by weight of the polycarbonate resin.

6. The resin composition according to claim 1 which comprises a hindered phenol-based heat stabilizer (E) in an amount of 0.001 to 0.1 part by weight based on 100 parts by weight of the polycarbonate resin.

7. The resin composition according to claim 1, wherein the polycarbonate resin contains 2,2-bis(4-hydroxyphenyl)propane as the main diphenol component.

8. A molded article of the resin composition of claim 1.

9. A spectacle lens made of the resin composition of claim 1.