Polarizing plate protective film, polarizing plate, and display device

Patent metadata

Field	Value
Publication number	US-10457792-B2
Application number	US-201715497824-A
Country	US
Kind code	B2
Filing date	Apr 26, 2017
Priority date	Oct 31, 2014
Publication date	Oct 29, 2019
Grant date	Oct 29, 2019

Abstract

A polarizing plate protective film which prevents deterioration of polarization performance in a high temperature, high humidity environment, and a polarizing plate and display device using the film including a compound represented by the following General Formula (I).

(X-L n Z  General Formula (I)

X represents a formyl group, a boronic acid group, or a group represented by the following General Formula (I-B) or a group represented by the following General Formula (I-C), where L represents a single bond or divalent linking group, and n represents an integer equal to or greater than 2. When n is 2, Z represents a single bond or a divalent group, and when n≥3, Z represents an n-valent group.

R A and R B represent an alkyl group, a cycloalkyl group, an aryl group, or an acyl group. R A and R B may be bonded to each other to form a ring. * represents a bond to be bonded to L.

First claim

What is claimed is:

1. A polarizing plate protective film comprising: a compound represented by the following General Formula (I),
(X-L n Z  General Formula (I)

in General Formula (I), X represents a formyl group, and a group represented by the following General Formula (I-B) or a group represented by the following General Formula (I-C), L represents a single bond or divalent linking group, and n represents an integer equal to or greater than 2; when n is 2, Z represents a single bond or a divalent group, and when n is equal to or greater than 3, Z represents an n-valent group where a plurality of -L-X's may be the same as each other or different from each other; however, among a plurality of X's, the number of the group represented by General Formula (I-B) and the group represented by the General Formula (I-C) is respectively 0 or 1, and when n is 2, both of L and Z may not be a single bond,

in General Formulae (I-B) and (I-C), R A and R B each independently represent an alkyl group, a cycloalkyl group, an aryl group, or an acyl group where, R A and R B may be bonded to each other to form a ring; and * represents a bond to be bonded to L.

2. The polarizing plate protective film according to claim 1 ,
wherein the compound represented by General Formula (I) is represented by any of the following General Formulae (II-1) to (II-5),

in General Formulae (II-1) to (II-5), X and n are identical to X and n of General Formula (I); when n is 2, Z 2 represents a divalent group, and when n is equal to or greater than 3, Z 2 represents an n-valent group; when n is 2, Z 3 represents an alkylene group, and when n is equal to or greater than 3, Z 3 represents an n-valent alkyl group; however, Z 3 does not have a ring structure; R 1 to R 5 each independently represent a substituent; n1 represents an integer of 2 to 6, n2 represents an integer of 2 to 12, and n3 and n4 each independently represent an integer of 1 to 5; and m1, m2, m4, and m5 each independently represent an integer of 0 to 4, and m3 represents an integer of 0 to 10.

3. The polarizing plate protective film according to claim 1 ,
wherein the compound represented by General Formula (I) includes at least one benzene ring.

4. The polarizing plate protective film according to claim 1 ,
wherein the compound represented by General Formula (I) is represented by General Formula (II-1) or (II-3).

5. The polarizing plate protective film according to claim 1 ,
wherein the n is an integer of 2 to 4, and the total number of carbon atoms of component parts other than X is equal to or smaller than 40.

6. The polarizing plate protective film according to claim 1 ,
wherein the number of shortest linking atoms which link two X's with each other is equal to or smaller than 20 between every two X's.

7. The polarizing plate protective film according to claim 1 ,
wherein the Z is a single bond, —O—, —S—, —SO—, —SO 2 —, —OC(═O)—, —C(R a1 )(R a2 ) —, >C<, (—OCH 2 CH 2 ) 2 C(CH2CH2O—) 2 , >C(R a3 )—, >N—, or —N(Ra)—, R a1 to R a3 each independently represent a hydrogen atom, an alkyl group, or an aryl group, and Ra represents a hydrogen atom, an alkyl group, an aryl group, or an acyl group.

8. The polarizing plate protective film according to claim 1 , including cellulose acylate.

9. A polarizing plate comprising:
the polarizing plate protective film according to claim 1 on both sides or one side of a polarizer.

10. The polarizing plate according to claim 9 further comprising:
a compound represented by the following General Formula (A) on at least one polarizing plate protective film which is bonded to both sides or one side of the polarizer,

in General Formula (A), R A1 and R A3 each independently represent a hydrogen atom, an alkyl group, a cycloalkyl group, an alkenyl group, or an aromatic group where an alkyl group, a cycloalkyl group, an alkenyl group, or an aromatic group may include a substituent; and R A5 represents a hydrogen atom or a substituent.

11. A display device comprising at least one polarizing plate according to claim 9 .

Assignees

• Fujifilm Corp

Inventors

• Fukagawa Nobutaka
• Sano Naoki
• Nojiri Mayumi
• Yoshida Aiko
• Shimoju Naoya

Classifications

• C07C47/575

  containing ether groups, [IMAGE cpc-sch-C07C-0958.gif] groups,[IMAGE cpc-sch-C07C-0959.gif] groups, or[IMAGE cpc-sch-C07C-0960.gif] groups · CPC title

• C08L1/10

  Esters of organic acids {, i.e. acylates} · CPC title

• C08K5/1565

  Five-membered rings · CPC title

• C08L1/12

  Cellulose acetate · CPC title

• C07C47/52

  Compounds having —CHO groups bound to carbon atoms of six—membered aromatic rings · CPC title