Film

Patent metadata

Field	Value
Publication number	US-9964669-B2
Application number	US-201515113736-A
Country	US
Kind code	B2
Filing date	Jan 23, 2015
Priority date	Jan 23, 2014
Publication date	May 8, 2018
Grant date	May 8, 2018

Abstract

A film obtained by molding a methacrylic resin composition, the methacrylic resin composition comprises: a methacrylic resin having a triad syndiotacticity (rr) of not less than 50% and a weight average molecular weight of 80000 to 200000 and comprising not less than 92% by mass of a structural unit derived from methyl methacrylate, and a polycarbonate resin having a melt volume-flow rate of 130 to 250 cm 3 /20 min at 300° C. and 1.2 Kg, in which a mass ratio of the methacrylic resin to the polycarbonate resin is 91/9 to 99/1, and the total content of the methacrylic resin and the polycarbonate resin is 80 to 100% by mass. The film is layered to at least one surface of a polarizer to give a polarizing plate.

First claim

The invention claimed is:

1. A film comprising a methacrylic resin composition, the methacrylic resin composition comprising:
a methacrylic resin having a triad syndiotacticity (rr) of not less than 50% and a weight average molecular weight of 80000 to 200000 and comprising not less than 92% by mass of a structural unit derived from methyl methacrylate, and
a polycarbonate resin having a melt volume-flow rate of 130 to 250 cm 3 /10 min at a temperature of 300° C. and a load of 1.2 kg;
in which a mass ratio of the methacrylic resin to the polycarbonate resin is from 91/9 to 99/1, and
a total content of the methacrylic resin and the polycarbonate resin is 80 to 100% by mass.

2. The film according to claim 1 , having a thickness of 10 to 50 μm.

3. The film according to claim 1 , wherein the methacrylic resin has the syndiotacticity (rr) of not less than 58% and not more than 85%.

4. The film according to claim 1 , wherein the methacrylic resin comprises not less than 99% by mass of the structural unit derived from methyl methacrylate.

5. The film according to claim 1 , the film being a biaxially stretched film having an area based draw ratio of 1.5 to 8.

6. A polarizer protective film, comprising the film according to claim 1 .

7. A polarizing plate, comprising a polarizer and at least one of the polarizer protective film according to claim 6 layered on the polarizer.

8. The polarizing plate according to claim 7 , wherein the polarizer comprises a polyvinyl alcohol resin having a degree of polymerization from 100 to 5000, and a dichroic substance.

9. The polarizing plate according to claim 7 , further comprising adhesive-agent layer between the polarizer and the polarizer protective film.

10. The polarizing plate according to claim 7 , further comprising an adhesiveness enhancing layer provided by adhesiveness enhancing treatment or performing a method of forming an anchor layer.

11. The film according to claim 1 , wherein the methacrylic resin has a ratio of the weight average molecular weight to the number average molecular weight of 1.2 to 2.0.

12. The film according to claim 1 , wherein the methacrylic resin has a melt flow rate of 0.1 to 5 g/10 min.

13. The film according to claim 1 , wherein the methacrylic resin has a glass transition temperature of not less than 120° C.

14. The film according to claim 1 , wherein the polycarbonate resin has a weight average molecular weight of 15000 to 28000.

15. The film according to claim 1 , wherein the polycarbonate resin has a glass transition temperature of not less than 130° C.

16. The film according to claim 1 , wherein the methacrylic resin composition has a melt flow rate of 0.1 to 6 g/10 min.

17. The film according to claim 1 , wherein the methacrylic resin composition has a haze under 3.2 mm-thick of not more than 3.0%.

18. The film according to claim 1 , having a haze under 50 μm-thick of not more than 0.2%.

19. The film according to claim 1 , having an in-plane direction retardation Re of not more than 5 nm.

20. The film according to claim 1 , having a thickness direction retardation Rth of not less than −5 nm and not more than 5 nm.

Assignees

• Kuraray Co

Inventors

• Nakahara Atsuhiro
• Abe Toru
• Nomoto Yusaku
• Tsuji Wataru
• Takasuka Yuuki
• Hoshiba Takao

Classifications

• G02B5/3033

  in the form of a thin sheet or foil, e.g. Polaroid · CPC title

• C08J2333/12

  Homopolymers or copolymers of methyl methacrylate · CPC title

• C08J2469/00

  Characterised by the use of polycarbonates; Derivatives of polycarbonates · CPC title

• C08L33/12 Primary

  Homopolymers or copolymers of methyl methacrylate · CPC title

• G02B1/14 Primary

  Protective coatings, e.g. hard coatings · CPC title