Special polycarbonate polarizing eyewear

Patent metadata

Field	Value
Publication number	US-9709702-B2
Application number	US-201314420799-A
Country	US
Kind code	B2
Filing date	Aug 12, 2013
Priority date	Aug 14, 2012
Publication date	Jul 18, 2017
Grant date	Jul 18, 2017

Abstract

Eyewear uses a polarizing lens obtained by bending a multilayer polarizing sheet in which a sheet (A) including at least 50% by mass of an aromatic polycarbonate resin and having a retardation value of 2000 nm or less at a wavelength of 600 nm is layered on one side of a polarizing film, and a sheet (B) including a special polycarbonate resin obtained by carbonate bonding a dihydroxy compound through use of a carbonic acid diester, the polycarbonate resin being a compound in which 70-100 mol % of the dihydroxy compound is represented by general formula (1), is layered on the other side of the polarizing film.

(In general formula (1), R 1 and R 2 are each independently a hydrogen atom, a C 1 -C 20 alkyl group, or the like. In general formula (1), X are each independently a C 2 -C 8 alkylene group or the like.)

First claim

The invention claimed is:

1. An eyewear which uses a polarizing lens obtained by bending a multilayer polarizing sheet in which a sheet (A) including at least 50% by mass of an aromatic polycarbonate resin and having a retardation value of 2000 nm or less at a wavelength of 600 nm is layered on one side of a polarizing film, and a sheet (B) including a special polycarbonate resin obtained by carbonate bonding a dihydroxy compound through use of a carbonic acid diester, the polycarbonate resin being a compound in which 70 to 100 mol % of the dihydroxy compound is represented by general formula (1), is layered on the other side of the polarizing film:

wherein in general formula (1), R 1 and R 2 are each independently a hydrogen atom, a C 1 -C 20 alkyl group, a C 1 -C 20 alkoxyl group, a C 5 -C 20 cycloalkyl group, a C 5 -C 20 cycloalkoxyl group, a C 6 -C 20 aryl group or a C 6 -C 20 aryloxy group; and Xs are each independently a C 2 -C 8 alkylene group, a C 5 -C 12 cycloalkylene group or a C 6 -C 20 arylene group.

2. The eyewear according to claim 1 , wherein 80 to 95 mol % of the whole dihydroxy compound constituting the resin included in the sheet (B) is a compound represented by general formula (1).

3. The eyewear according to claim 1 , wherein the resin included in the sheet (B) consists of only the special polycarbonate resin; 80 to 95 mol % of the dihydroxy compound constituting the special polycarbonate resin is a compound represented by general formula (1); and the remaining 20 to 5 mol % of the dihydroxy compound is a dihydroxy compound other than the compound represented by general formula (1).

4. The eyewear according to claim 1 , wherein the resin included in the sheet (B) consists of the special polycarbonate resin and an aromatic polycarbonate resin; 100 mol % of the dihydroxy compound constituting the special polycarbonate resin is a compound represented by general formula (1); the dihydroxy compound constituting the aromatic polycarbonate resin is a dihydroxy compound other than the compound represented by general formula (1); and 80 to 95 mol % of the whole dihydroxy compound constituting the resin included in the sheet (B) is the compound represented by general formula (1).

5. The eyewear according to claim 1 , wherein the temperature difference between the glass-transition temperature of the sheet (B) and the glass-transition temperature of the sheet (A) having a retardation value of 2000 nm or less is 10° C. or less.

6. The eyewear according to claim 1 , wherein in the compound represented by general formula (1), R 1 and R 2 are a hydrogen atom and Xs are an ethylene group.

7. The eyewear according to claim 3 , wherein the dihydroxy compound other than the compound represented by general formula (1) is a compound represented by the below-described structural formula (1).

8. The eyewear according to claim 3 , wherein the dihydroxy compound other than the compound represented by general formula (1) is a compound represented by the below-described general formula (2):
HOCH 2 —Y—CH 2 OH  general formula (2)

wherein in general formula (2), Y is a C 1 -C 10 alkylene group or a C 4 -C 20 cycloalkylene group.

9. The eyewear according to claim 8 , wherein the compound represented by general formula (2) is at least one selected from tricyclo[5.2.1.0 2,6 ]decanedimethanol, cyclohexane-1,4-dimethanol and pentacyclopentadecanedimethanol.

10. The eyewear according to claim 8 , wherein the compound represented by general formula (2) is tricyclo[5.2.1.0 2,6 ]decanedimethanol.

11. The eyewear according to claim 1 , wherein the retardation value of the sheet (B) at a wavelength of 600 nm is 20 nm or less.

12. The eyewear according to claim 1 , which is subjected to a curving process to have a spherical or non-spherical surface so that the surface at the sheet (B) side becomes a convex surface.

13. The eyewear according to claim 12 , wherein an aromatic polycarbonate resin is further injection-molded on the concave surface.

Assignees

• Mitsubishi Gas Chemical Co
• Mgc Filsheet Co Ltd

Inventors

• Gotou Takuya
• Mitsuhata Kazuhisa
• Nakamura Kyousuke
• Nakashima Masatoshi

Classifications

• B32B2551/00

  Optical elements · CPC title

• B32B2250/03

  3 layers · CPC title

• A61F9/022

  Use of special optical filters, e.g. multiple layers, filters for protection against laser light or light from nuclear explosions, screens with different filter properties on different parts of the screen; Rotating slit-discs (optical filters per se G02B5/20) · CPC title

• C08G64/06 Primary

  not containing aliphatic unsaturation · CPC title

• G02C7/12

  Polarisers · CPC title