Alkyl-modified vinyl acetal polymer, and composition

Patent metadata

Field	Value
Publication number	US-9416054-B2
Application number	US-201214008255-A
Country	US
Kind code	B2
Filing date	Mar 26, 2012
Priority date	Mar 28, 2011
Publication date	Aug 16, 2016
Grant date	Aug 16, 2016

Abstract

Provided are a vinyl acetal polymer that has sufficient plasticity and solubility in an alcohol solvent, imparts low viscosity, stability, etc., to a solution thereof, is less likely to cause phase separation from other components, and allows for formation of a slurry superior in dispersibility of particles and thixotropic nature, as well as a sheet superior in strength and flexibility, and the like. An alkyl-modified vinyl acetal polymer obtained by subjecting an alkyl-modified vinyl alcohol polymer to acetalization, in which the alkyl-modified vinyl alcohol polymer comprises a monomer unit represented by the following general formula (I), and has a viscosity average degree of polymerization P of 150 or greater and 5,000 or less, a degree of saponification of 20 mol % or greater and 99.99 mol % or less, and a percentage of alkyl modification S with the monomer unit of 0.05 mol % or greater and 5 mol % or less.

First claim

The invention claimed is:

1. An alkyl-modified vinyl acetal polymer obtained by subjecting an alkyl-modified vinyl alcohol polymer to acetalization,
wherein:
the alkyl-modified vinyl alcohol polymer comprises a monomer unit represented by formula (I), and
the alkyl-modified vinyl alcohol polymer has: a viscosity average degree of polymerization P of 150 to 5,000; a degree of saponification of 20 mol % to 99.99 mol %; and a percentage of alkyl modification S with the monomer unit of 0.05 mol % to 5 mol %,

wherein R 1 represents a linear or branched alkyl group having 10 to 29 carbon atoms; and R 2 represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms.

2. The alkyl-modified vinyl acetal polymer of claim 1 , having a degree of acetalization of 1 mol % to 85 mol %.

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

4. The composition of claim 3 , further comprising a ceramic powder and an organic solvent.

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

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

7. The composition of claim 4 , which is suitable for use as a slurry composition for producing a ceramic green sheet.

8. An alkyl-modified vinyl acetal polymer, comprising a monomer unit represented by formula (I), and having: a viscosity average degree of polymerization P of 150 to 5,000; a degree of acetalization of 1 mol % to 85 mol %; and a percentage of alkyl modification S with the monomer unit of 0.05 mol % to 5 mol %,

wherein R 1 represents a linear or branched alkyl group having 10 to 29 carbon atoms; and R 2 represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms.

9. A composition comprising the alkyl-modified vinyl acetal polymer of claim 8 .

10. The composition of claim 9 , further comprising a ceramic powder and an organic solvent.

11. A ceramic green sheet produced from the composition of claim 10 .

12. A laminated ceramic capacitor produced from the ceramic green sheet of claim 11 .

13. The composition of claim 10 , which is suitable for use as a slurry composition for producing a ceramic green sheet.

14. A method for producing an alkyl-modified vinyl acetal polymer, the method comprising:
copolymerizing an unsaturated monomer represented by formula (II) with a vinyl ester monomer to form an alkyl-modified vinyl ester polymer having a viscosity average degree of polymerization P of 150 to 5,000, and a percentage of alkyl modification S with the unsaturated monomer of 0.05 mol % to 5 mol %;
saponifying the alkyl-modified vinyl ester polymer to form an alkyl-modified vinyl alcohol polymer having a degree of saponification of 20 mol % to 99.99 mol %; and
subjecting the alkyl-modified vinyl alcohol polymer to acetalization to form an alkyl-modified vinyl acetal polymer having a degree of acetalization of 1 mol % to 85 mol %,

wherein R 1 represents a linear or branched alkyl group having 10 to 29 carbon atoms; and R 2 represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms.

Assignees

• Kawagoe Masako
• Nii Shinsuke
• Kuraray Co

Inventors

• Kawagoe Masako
• Nii Shinsuke

Classifications

• C04B35/10 Primary

  based on aluminium oxide · CPC title

• C08F218/08

  Vinyl acetate · CPC title

• C08F216/38

  by an acetal or ketal radical · CPC title

• C08F8/28

  Condensation with aldehydes or ketones · CPC title

• H01G4/12

  Ceramic dielectrics {(H01G4/085 takes precedence)} · CPC title