Vinyl alcohol polymer, aqueous solution, coating agent, ink jet recording material, thermal recording material and base paper for release paper containing same

Patent metadata

Field	Value
Publication number	US-9309431-B2
Application number	US-201214126147-A
Country	US
Kind code	B2
Filing date	Jun 12, 2012
Priority date	Jun 14, 2011
Publication date	Apr 12, 2016
Grant date	Apr 12, 2016

Abstract

Provided is a vinyl alcohol polymer that provides a coating film having superior water resistance and binder performances, and has sufficient solubility in water and viscosity stability even in a neutral pH region. Further provided are an aqueous solution, a coating agent, an ink jet recording material, a thermal recording material and a base paper for a release paper that comprise the vinyl alcohol polymer, and a method for producing same, and the like. The vinyl alcohol polymer includes a monomer unit represented by the following formula (1), with the following inequality (I) being satisfied. Preferably, the following inequalities (II) and (III) are further satisfied according to the PVA:

wherein, P represents the viscosity average degree of polymerization; and S represents the content (mol %) of the monomer unit.

First claim

The invention claimed is:

1. A vinyl alcohol polymer, comprising a monomer unit represented by formula (1):

wherein:
X represents a direct bond, a divalent hydrocarbon group, or a divalent organic group having an oxygen atom or a nitrogen atom;
R 1 represents a hydrogen atom or an alkyl group having 1 to 5 carbon atoms;
R 2 represents an alkoxyl group, an acyloxyl group or a group represented by OM, wherein M represents a hydrogen atom, an alkali metal or an ammonium group;
R 3 and R 4 each independently represent a hydrogen atom or an alkyl group, wherein hydrogen atoms included in the alkyl group, the alkoxyl group and the acyloxyl group represented by R 1 to R 4 are unsubstituted or substituted with a substituent having an oxygen atom or a nitrogen atom;
R 5 represents a hydrogen atom or a methyl group;
m is an integer of 0 to 2; and
n is an integer of 6 to 20,
wherein in a case where R 1 to R 5 are each present in a plurality of number, a plurality of R 1 s are each independently as defined above, a plurality of R 2 s are each independently as defined above, a plurality of R 3 s are each independently as defined above, a plurality of R 4 s are each independently as defined above, and a plurality of R 5 s are each independently as defined above,
and inequalities (I), (II), and (III) are satisfied:
370 ≦P×S≦ 6,000  (I)

200 ≦P≦ 4,000  (II)

0.1 ≦S≦ 10  (III);

wherein:
P represents a viscosity average degree of polymerization of the vinyl alcohol polymer; and
S represents a percentage content (mol %) of the monomer unit.

2. The vinyl alcohol polymer according to claim 1 , wherein:
X in formula (1) is represented by —CO—NR 6 —*;
R 6 represents a hydrogen atom or an alkyl group having 1 to 5 carbon atoms;
* denotes a binding site on a side where a Si atom is included in formula (1); and
n is an integer of 6 to 12.

3. An aqueous solution, comprising water and the vinyl alcohol polymer according to claim 1 in an amount of 4% by mass or more and 20% by mass or less, and having a pH of 4 or higher and 8 or lower.

4. A coating agent, comprising:
at least one of water and a non-aqueous solvent, and
the vinyl alcohol polymer according to claim 1 .

5. An ink jet recording material, comprising the vinyl alcohol polymer according to claim 1 .

6. A thermal recording material, comprising the vinyl alcohol polymer according to claim 1 .

7. A base paper for a release paper, the base paper comprising the vinyl alcohol polymer according to claim 1 .

8. The vinyl alcohol polymer according to claim 1 , wherein X represents a direct bond.

9. The vinyl alcohol polymer according to claim 1 , wherein X represents a divalent hydrocarbon group selected from the group consisting of a divalent aliphatic hydrocarbon group having 1 to 10 carbon atoms and a divalent aromatic hydrocarbon group having 6 to 10 carbon atoms.

10. The vinyl alcohol polymer according to claim 1 , wherein X represents a divalent organic group having an oxygen atom or a nitrogen atom selected from the group consisting of an ether group, an ester group, a carbonyl group, an amide group, a group derived by linking an ether group, an ester group, a carbonyl group, or an amide group with a divalent hydrocarbon group, an imino group, an amide group, and a group derived by linking an imino group or an amide group with a divalent hydrocarbon group.

11. The vinyl alcohol polymer according to claim 1 , wherein 400≦P×S≦3,000, 500≦P≦3,000 and 0.25≦S≦6.

12. The vinyl alcohol polymer according to claim 1 , wherein 500≦P×S≦2,000, 1,000≦P≦2,400 and 0.5≦S≦5.

13. The vinyl alcohol polymer according to claim 11 , wherein X represents a direct bond, a divalent hydrocarbon group selected from the group consisting of a divalent aliphatic hydrocarbon group having 1 to 10 carbon atoms and a divalent aromatic hydrocarbon group having 6 to 10 carbon atoms, or a divalent organic group having an oxygen atom or a nitrogen atom selected from the group consisting of an ether group, an ester group, a carbonyl group, an amide group, a group derived by linking an ether group, an ester group, a carbonyl group, or an amide group with a divalent hydrocarbon group, an imino group, an amide group, and a group derived by linking an imino group or an amide group with a divalent hydrocarbon group.

14. The vinyl alcohol polymer according to claim 12 , wherein X represents a direct bond, a divalent hydrocarbon group selected from the group consisting of a divalent aliphatic hydrocarbon group having 1 to 10 carbon atoms and a divalent aromatic hydrocarbon group having 6 to 10 carbon atoms, or a divalent organic group having an oxygen atom or a nitrogen atom selected from the group consisting of an ether group, an ester group, a carbonyl group, an amide group, a group derived by linking an ether group, an ester group, a carbonyl group, or an amide group with a divalent hydrocarbon group, an imino group, an amide group, and a group derived by linking an imino group or an amide group with a divalent hydrocarbon group.

Assignees

• Taoka Yuta
• Nii Shinsuke
• Nakamae Masato
• Kuraray Co

Inventors

• Taoka Yuta
• Nii Shinsuke
• Nakamae Masato

Classifications

• B41M2205/04

  Direct thermal recording [DTR] · CPC title

• D21H21/16

  Sizing or water-repelling agents · CPC title

• B41M5/44

  characterised by the macromolecular compounds · CPC title

• C09D129/02 Primary

  Homopolymers or copolymers of unsaturated alcohols (C09D129/14 takes precedence) · CPC title

• B41M5/506

  Intermediate layers · CPC title