Polyoxyalkylene-modified vinyl acetal polymer, and composition comprising same

Patent metadata

Field	Value
Publication number	US-9410003-B2
Application number	US-201214001569-A
Country	US
Kind code	B2
Filing date	Feb 24, 2012
Priority date	Feb 25, 2011
Publication date	Aug 9, 2016
Grant date	Aug 9, 2016

Abstract

There is provided a polyoxyalkylene-modified vinyl acetal polymer which has polyoxyalkylene groups represented by general formula (I) in side chain, in which a viscosity-average polymerization degree P is 150 to 5000, an acetalization degree is 10 to 85 mol % and a polyoxyalkylene modification rate S is 0.1 to 10 mol %. Such a polymer has a feature that a film or sheet produced therefrom has improved film strength and flexibility, as well as a feature that a resin composition therefrom is free from phase separation.

wherein R 1 represents a hydrogen atom or a methyl group, R 2 represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms, and 1≦m≦10 and 3≦n≦20.

First claim

The invention claimed is:

1. A polyoxyalkylene-modified vinyl acetal polymer which comprises a polyoxyalkylene group represented by formula (I) in a side chain, and which has a viscosity-average polymerization degree P of 150 to 5000, an acetalization degree of 10 to 85 mol %, and a polyoxyalkylene modification rate S of 0.1 to 10 mol %

wherein R 1 represents a hydrogen atom or a methyl group; R 2 represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms; and 1≦m≦10 and 3≦n≦20.

2. The polyoxyalkylene-modified vinyl acetal polymer of claim 1 , produced by acetalizing a polyoxyalkylene-modified vinyl alcohol polymer which comprises the polyoxyalkylene group represented by formula (I) in a side chain, and which has a viscosity-average polymerization degree P of 150 to 5000, a saponification degree of 20 to 99.99 mol % and a polyoxyalkylene modification rate S of 0.1 to 10 mol %.

3. A composition comprising the polyoxyalkylene-modified vinyl acetal polymer of claim 1 .

4. A slurry composition comprising the polyoxyalkylene-modified vinyl acetal polymer of claim 1 , a ceramic powder and an organic solvent.

5. A ceramic green sheet produced from the slurry composition of claim 4 .

6. A laminated ceramic capacitor produced from the ceramic green sheet of claim 5 .

7. A process for producing the polyoxyalkylene-modified vinyl acetal polymer of claim 1 , the process comprising
copolymerizing an unsaturated monomer represented by formula (II) with a vinyl ester monomer, to obtain a polyoxyalkylene-modified vinyl ester copolymer;
saponifying the polyoxyalkylene-modified vinyl ester copolymer, to obtain a polyoxyalkylene-modified vinyl alcohol polymer; and
acetalizing the polyoxyalkylene-modified vinyl alcohol polymer

wherein R 1 , R 2 , m and n are as defined in formula (I); R 3 represents a hydrogen atom or a —COOM group, wherein M represents a hydrogen atom, an alkali metal or an ammonium group; R 4 represents a hydrogen atom, a methyl group or a —CH 2 —COOM group, wherein M is as defined above; and X represents —O—, —CH 2 —O—, —CO—, —(CH 2 ) k —, —CO—O—, —CO—NR 5 —or —CO—NR 5 —CH 2 —, wherein R 5 represents a hydrogen atom or a saturated alkyl group having 1 to 4 carbon atoms and 1≦k≦15.

8. The process of claim 7 , wherein the unsaturated monomer represented by formula (II) is an unsaturated monomer represented by formula (III)

wherein R 1 , R 2 , R 4 , R 5 , m and n are as defined in formula (II).

9. The polyoxyalkylene-modified vinyl acetal polymer of claim 1 . wherein R 1 represents a hydrogen atom.

10. The polyoxyalkylene-modified vinyl acetal polymer of claim 1 , wherein R 1 represents a methyl group.

11. The polyoxyalkylene-modified vinyl acetal polymer of claim 1 , wherein R 2 represents a hydrogen atom.

12. The polyoxyalkylene-modified vinyl acetal polymer of claim 1 , wherein R 2 represents an alkyl group having 1 to 8 carbon atoms.

13. The polyoxyalkylene-modified vinyl acetal polymer of claim 1 , wherein R 1 represents a hydrogen atom and R 2 represents a hydrogen atom.

14. The polyoxyalkylene-modified vinyl acetal polymer of claim 1 , wherein R 1 represents a hydrogen atom and R 2 represents an alkyl group having 1 to 8 carbon atoms.

15. The polyoxyalkylene-modified vinyl acetal polymer of claim 1 , wherein R 1 represents a methyl group and R 2 represents a hydrogen atom.

16. The polyoxyalkylene-modified vinyl acetal polymer of claim 1 , wherein R 1 represents a methyl group and R 2 represents an alkyl group having 1 to 8 carbon atoms.

Assignees

• Kawagoe Masako
• Nii Shinsuke
• Kuraray Co

Inventors

• Kawagoe Masako
• Nii Shinsuke

Classifications

• C08F216/38

  by an acetal or ketal radical · CPC title

• C08L29/14

  Homopolymers or copolymers of acetals or ketals obtained by polymerisation of unsaturated acetals or ketals or by after-treatment of polymers of unsaturated alcohols · CPC title

• C08F220/58

  containing oxygen in addition to the carbonamido oxygen {, e.g. N-methylolacrylamide, N-(meth)acryloylmorpholine} · CPC title

• C08F218/08

  Vinyl acetate · CPC title

• C08F16/38 Primary

  by an acetal or ketal radical · CPC title