Film

Patent metadata

Field	Value
Publication number	US-9605121-B2
Application number	US-201414891544-A
Country	US
Kind code	B2
Filing date	May 16, 2014
Priority date	May 16, 2013
Publication date	Mar 28, 2017
Grant date	Mar 28, 2017

Abstract

A film is obtained by forming a methacrylic resin composition comprising 100 parts by mass of a methacrylic resin (A) and preferably 1 to 10 parts by mass of a polycarbonate resin, the methacrylic resin (A) having a triad syndiotacticity (rr) of not less than 58%, a weight average molecular weight of 50000 to 150000, a content of fraction having a molecular weight of not less than 200000 of 0.1 to 10% by mass and a content of fraction having a molecular weight of less than 15000 of 0.2 to 5% by mass. A polarizer protective film comprising the above film is obtained.

First claim

The invention claimed is:

1. A film comprising:
a methacrylic resin (A) which has
a triad syndiotacticity (rr) of not less than 58%,
a weight average molecular weight of 50000 to 150000,
a content of fraction having a molecular weight of not less than 200000 of 0.1 to 10%, and
a content of fraction having a molecular weight of less than 15000 of 0.2 to 5%.

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

3. The film according to claim 1 , wherein the methacrylic resin (A) has a melt flow rate of not less than 0.1 g/10 min. and not more than 10 g/10 min. as measured at a temperature of 230° C. and a load of 3.8 kg.

4. A polarizer protective film comprising the film according to claim 1 .

5. A film comprising:
100 parts by mass of a methacrylic resin (A) which has a triad syndiotacticity (rr) of not less than 58%, a weight average molecular weight of 50000 to 150000, a content of fraction having a molecular weight of not less than 200000 of 0.1 to 10%, and a content of fraction with a molecular weight of less than 15000 of 0.2 to 5%; and
1 to 10 parts by mass of a polycarbonate resin.

6. The film according to claim 5 , wherein the methacrylic resin (A) comprises not less than 99% by mass of a structural unit derived from methyl methacrylate.

7. The film according to claim 5 , wherein the methacrylic resin (A) has a melt flow rate of not less than 0.1 g/10 min. and not more than 10 g/10 min. as measured at a temperature of 230° C. and a load of 3.8 kg.

8. A polarizer protective film comprising the film according to claim 5 .

9. A method for manufacturing a film, the method comprising forming a methacrylic resin composition into a film, the methacylic resin composition comprising a methacrylic resin (A) which has a triad syndiotacticity (rr) of not less than 58%, a weight average molecular weight of 50000 to 150000, a content of fraction having a molecular weight of not less than 200000 of 01 to 10%, and a content of fraction having a molecular weight of less than 15000 of 0.2 to 5%.

10. The manufacturing method according to claim 9 , further comprising obtaining the methacrylic resin (A) by an anionic polymerization method.

11. The manufacturing method according to claim 9 , further comprising obtaining the methacrylic resin (A) by mixing a methacrylic resin (1) with a methacrylic resin (2) different from the methacrylic resin (1).

12. The manufacturing method according to claim 9 , further comprising obtaining the methacrylic resin (A) by mixing a methacrylic resin (I) manufactured by the anionic polymerization method with a methacrylic resin (II) manufactured by a radical polymerization method.

13. The manufacturing method according to claim 9 , further comprising obtaining the methacrylic resin composition by melt-kneading the methacrylic resin (A) with a polycarbonate resin or a polyester resin.

Assignees

• Kuraray Co

Inventors

• Takahashi Toru
• Nakahara Atsuhiro
• Ozawa Hiroshi
• Abe Toru
• Nomoto Yusaku

Classifications

• C08J5/18 Primary

  Manufacture of films or sheets · CPC title

• G02B5/3033

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

• C08J2333/06

  of esters containing only carbon, hydrogen, and oxygen, the oxygen atom being present only as part of the carboxyl radical · CPC title

• C08L33/10

  Homopolymers or copolymers of methacrylic acid esters · CPC title

• C08L2205/025

  containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure · CPC title