Polymer material, film, circular polarizing plate, image display apparatus, and manufacturing method for film

Patent metadata

Field	Value
Publication number	US-10851180-B2
Application number	US-201615766265-A
Country	US
Kind code	B2
Filing date	Oct 6, 2016
Priority date	Oct 6, 2015
Publication date	Dec 1, 2020
Grant date	Dec 1, 2020

Abstract

Provided is a polymer material containing at least one kind of a cellulose derivative having (a) an organosilyl group (the organosilyl group having a first aliphatic group, an unsaturated aliphatic group, or an aromatic group), and (b) an acyl group or a second aliphatic group.

First claim

What is claimed is:

1. A polymer material, comprising:
at least one cellulose derivative having the following formula (1):

wherein R 1 , R 2 , and R 3 are each independently selected from the group consisting of i) a hydrogen atom, ii) an organosilyl group having at least one selected from the group consisting of a tertiary butyl group, a tertiary hexyl group, an isopropyl group, an isobutyl group, a phenyl group, and a naphthyl group, iii) an acyl group, and iv) a second aliphatic group, provided that the at least one cellulose derivative comprises (a) the organosilyl group and (b) an aromatic acyl group, and
n is a positive integer.

2. The polymer material according to claim 1 , wherein the organosilyl group or the second aliphatic group in each of the at least one cellulose derivative has a substitution degree D 1 of from 1.00 to 2.40,
the acyl group in each of the at least one cellulose derivative has a substitution degree D 2 of from 0.10 to 2.00,
the acyl group in the polymer material has a total substitution degree D 3 of from 0.10 to 2.00, and
D 1 and D 2 satisfy D 1 +D 2 ≤3.0.

3. The polymer material according to claim 1 , wherein the at least one cellulose derivative comprises a plurality of organosilyl groups, and at least one of the organosilyl groups is a trisubstituted organosilyl group.

4. The polymer material according to claim 1 , wherein each of the at least one cellulose derivative comprises a plurality of organosilyl groups, and at least one of the organosilyl groups has at least one selected from the group consisting of a tertiary butyl group, a tertiary hexyl group, and an isopropyl group.

5. The polymer material according to claim 1 , wherein the polymer material has a glass transition temperature (Tg) of 180° C. or higher.

6. The polymer material according to claim 1 , wherein each of the at least one cellulose derivative comprises a plurality of acyl groups, and at least one of the acyl groups is an acyl group having a 1-naphthoyl group or a 2-naphthoyl group.

7. The polymer material according to claim 1 , wherein each of the at least one cellulose derivative comprises a plurality of acyl groups, and at least one of the acyl groups is an acyl group having a 2-naphthoyl group.

8. A film, comprising:
the polymer material of claim 1 .

9. The film according to claim 8 , wherein the film has an in-plane retardation Re (550) of from 130 to 160 nm and a film thickness of 50 μm or less.

10. The film according to claim 8 , wherein the film has a reverse wavelength dispersion (Re (450) Re (550)) of from 0.50 to 0.99.

11. The film according to claim 8 , wherein the film has a photoelastic coefficient (K) of from 5×10 −12 to 30×10 −12 m 2 /N.

12. A circular polarizing plate, comprising:
at least one sheet of the film of claim 8 .

13. An image display apparatus, comprising:
the circular polarizing plate of claim 12 .

14. A method of manufacturing the film according to claim 8 , the method comprising:
stretching a film comprising the polymer material at a temperature of from (Tg−10) to (Tg+30) ° C., wherein Tg is a glass transition temperature of the film comprising the polymer material.

15. The method according to claim 14 , wherein the stretching of the film is conducted at a stretch ratio of 20-200%.

16. A polymer material, comprising:
at least one cellulose derivative having the following formula (1):

where R1, R2 and R3 are each independently selected from the group consisting of i) a hydrogen atom, ii) an organosilyl group having a first aliphatic group, an unsaturated aliphatic group or an aromatic group, iii) an acyl group and iv) a second aliphatic group, provided that the last one cellulose derivative comprises (a) the organosilyl group and (b) a plurality of acyl groups, wherein at least one of the plurality of acyl groups is an acyl group having a 1-naphthoyl group or a 2-naphthoyl group, and
n is a positive integer.

17. A film, comprising:
the polymer material of claim 16 .

18. A circular polarizing plate, comprising:
at least one sheet of the film of claim 17 .

19. An image display apparatus, comprising:
the circular polarizing plate of claim 18 .

20. A method of manufacturing the film according to claim 17 , the method comprising:
stretching a film comprising the polymer material at a temperature of from (Tg−10) to (Tg+30) ° C., wherein Tg is a glass transition temperature of the film comprising the polymer material.

Assignees

• Kaneka Corp

Inventors

• Mukai Ryutaro
• Koma Hiroto
• Yasumoto Takahiro
• Fujisawa Katsuya
• Abo Tomohiro

Classifications

• C08J2301/32

  Cellulose ether-esters · CPC title

• B29K2001/08

  Cellulose derivatives · CPC title

• C08J2301/26

  Cellulose ethers · CPC title

• B29L2011/0066

  Optical filters · CPC title

• B29C55/06

  parallel with the direction of feed · CPC title