Resin composition and optical compensation film using same

Patent metadata

Field	Value
Publication number	US-10126478-B2
Application number	US-201515519403-A
Country	US
Kind code	B2
Filing date	Oct 13, 2015
Priority date	Oct 15, 2014
Publication date	Nov 13, 2018
Grant date	Nov 13, 2018

Abstract

A resin composition suitable for an optical compensation film, an optical compensation film using the same, which is excellent in the retardation characteristics and wavelength dispersion characteristics, and a production method of an optical compensation film. A resin composition containing, as resin components, from 30 to 99 wt % of a cellulose-based resin represented by the following formula (1) and from 1 to 70 wt % of a cinnamic acid ester copolymer:

where each of R 1 , R 2 and R 3 independently represents hydrogen or a substituent having a carbon number of 1 to 12.

First claim

The invention claimed is:

1. A resin composition, comprising, as resin components:
from 30 to 99 wt % of a cellulose-containing resin represented by the following formula (1); and
from 1 to 70 wt % of a cinnamic acid ester copolymer:

wherein each of R 1 , R 2 and R 3 independently represents hydrogen or a substituent having a carbon number of 1 to 12.

2. The resin composition according to claim 1 , wherein the cinnamic acid ester copolymer comprises from 10 to 90 mol % of an alkoxycinnamic acid ester residue unit represented by the following formula (2):

wherein each of R 4 and R 5 independently represents an alkyl group having a carbon number of 1 to 12.

3. The resin composition according to claim 2 , wherein the cinnamic acid ester copolymer comprises from 5 to 50 mol % of a fumaric acid monoester residue unit represented by the following formula (3), from 0 to 85 mol % of a fumaric acid diester residue unit represented by the following formula (4), and from 10 to 90 mol % of an alkoxycinnamic acid ester residue unit represented by the following formula (2):

wherein R 6 represents an alkyl group having a carbon number of 1 to 12;

wherein each of R 7 and R 8 independently represents an alkyl group having a carbon number of 1 to 12; and

wherein each of R 4 and R 5 independently represents an alkyl group having a carbon number of 1 to 12.

4. The resin composition according to claim 2 , wherein the cinnamic acid ester copolymer comprises from 10 to 50 mol % of a fumaric acid monoester residue unit represented by the following formula (3), from 0 to 60 mol % of a fumaric acid diester residue unit represented by the following formula (4), and from 30 to 90 mol % of an alkoxycinnamic acid ester residue unit represented by the following formula (2):

wherein R 6 represents an alkyl group having a carbon number of 1 to 12;

wherein each of R 7 and R 8 independently represents an alkyl group having a carbon number of 1 to 12; and

wherein each of R 4 and R 5 independently represents an alkyl group having a carbon number of 1 to 12.

5. The resin composition according to claim 2 , wherein the cinnamic acid ester copolymer comprises:
from 5 to 50 mol % of a fumaric acid monoester residue unit selected from the group consisting of a monomethyl fumarate residue unit, a monoethyl fumarate residue unit, a monoisopropyl fumarate residue unit, a mono-n-propyl fumarate residue unit, a mono-n-butyl fumarate residue unit, a mono-tert-butyl fumarate residue unit, and a mono-2-ethylhexyl fumarate residue unit;
from 0 to 85 mol % of a fumaric acid diester residue unit selected from the group consisting of a dimethyl fumarate residue unit, a diethyl fumarate residue unit, a diisopropyl fumarate residue unit, a di-n-propyl fumarate residue unit, a di-n-butyl fumarate residue unit, a di-tert-butyl fumarate residue unit, and a di-2-ethylhexyl fumarate residue unit; and
from 10 to 90 mol % of an alkoxycinnamic acid ester residue unit represented by the following formula (2):

wherein each of R 4 and R 5 independently represents an alkyl group having a carbon number of 1 to 12.

6. The resin composition according to claim 2 , wherein the cinnamic acid ester copolymer contains:
from 5 to 85 mol % of a fumaric acid diester residue unit represented by the following formula (4);
from 5 to 40 mol % of a residue unit selected from the group consisting of an acrylic acid ester residue unit represented by the following formula (5), a methacrylic acid ester residue unit represented by the following formula (6), an acrylic acid amide residue unit represented by the following formula (7) and a methacrylic acid amide residue unit represented by the following formula (8); and
from 10 to 90 mol % of an alkoxycinnamic acid ester residue unit represented by the following formula (2):

wherein each of R 7 and R 8 independently represents an alkyl group having a carbon number of 1, to 12;

wherein each of R 9 , R 10 , R 11 and R 12 independently represents an alkyl group having a carbon number of 1 to 12, an alkylene group or an ether group; and

wherein each of R 4 and R 5 independently represents an alkyl group having a carbon number of 1 to 12.

7. The resin composition according to claim 2 , wherein the cinnamic acid ester copolymer comprises:
from 5 to 65 mol % of a fumaric acid diester residue unit represented by the following formula (4);
from 5 to 40 mol % of a residue unit selected from the group consisting of an acrylic acid ester residue unit represented by the following formula (5), a methacrylic acid ester residue unit represented by the following formula (6), an acrylic acid amide residue unit represented by the following formula (7), and a methacrylic acid amide residue unit represented by the following formula (8); and
from 30 to 90 mol % of an alkoxycinnamic acid ester residue unit represented by the following formula (2):

wherein each of R 7 and R 8 independently represents an alkyl group having a carbon number of 1 to 12;

wherein each of R 9 , R 10 , R 11 and R 12 independently represents an alkyl group having a carbon number of 1 to 12, an alkylene group or an ether group; and

wherein each of R 4 and R 5 independently represents an alkyl group having a carbon number of 1 to 12.

8. The resin composition according to claim 1 , wherein the cinnamic acid ester copolymer comprises 20 mol % or more of a fumaric acid diester residue unit represented by the following formula (4) and 5 mol % or more of a substituted cinnamic acid ester residue unit represented by the following formula (9):

wherein each of R 7 and R 8 independently represents an alkyl group having a carbon number of 1 to 12; and

wherein R 13 represents an alkyl group having a carbon number of 1 to 12, and X represents

Assignees

• Tosoh Corp

Inventors

• Ito Masayasu
• Kitagawa Takahiro
• KOMINE Takuya
• Suyama Kaori

Classifications

• C08F22/16

  Esters having free carboxylic acid groups · CPC title

• C08L1/26

  Cellulose ethers · CPC title

• C08L2201/10

  Transparent films; Clear coatings; Transparent materials · CPC title

• G02B5/3033

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

• C08J5/18

  Manufacture of films or sheets · CPC title