Acetoacetyl group-containing polyvinyl alcohol resin powder composition, and production method therefor

Patent metadata

Field	Value
Publication number	US-9593174-B2
Application number	US-201415024118-A
Country	US
Kind code	B2
Filing date	Oct 10, 2014
Priority date	Oct 30, 2013
Publication date	Mar 14, 2017
Grant date	Mar 14, 2017

Abstract

Acetoacetyl group-containing polyvinyl alcohol resin powder composition containing a C1 to C3 alcohol in an amount of 0.5 to 4 wt % is produced by allowing a powdery polyvinyl alcohol resin to react with diketene, washing the resulting acetoacetyl group-containing polyvinyl alcohol resin particles with the C1 to C3 alcohol to remove an unreacted portion of the diketene, and drying the intermediate acetoacetyl group-containing polyvinyl alcohol resin particles composition at a temperature of 40° C. to 120° C. at a pressure of not higher than 20 kPa after the washing. The acetoacetyl group-containing polyvinyl alcohol resin powder composition thus produced is highly soluble in water.

First claim

The invention claimed is:

1. An acetoacetyl group-containing polyvinyl alcohol resin (AA-PVA) powder composition comprising:
acetoacetyl group-containing polyvinyl alcohol resin particles consisting of a structural unit represented by the following formula (1), a vinyl alcohol structural unit and a vinyl acetate structural unit:

and
a C1 to C3 alcohol in an amount of 0.5 to 4 wt. % of the powder composition.

2. The acetoacetyl group-containing polyvinyl alcohol resin powder composition according to claim 1 , wherein the C1 to C3 alcohol is methanol.

3. A method of producing the acetoacetyl group-containing polyvinyl alcohol resin powder composition according to claim 1 , the method comprising:
preparing acetoacetyl group-containing polyvinyl alcohol resin particles through a reaction of a powdery polyvinyl alcohol resin with diketene;
washing the acetoacetyl group-containing polyvinyl alcohol resin particles with a C1 to C3 alcohol to remove an unreacted portion of the diketene and thereby to form an intermediate acetoacetyl group-containing polyvinyl alcohol resin particles composition; and
drying the intermediate acetoacetyl group-containing polyvinyl alcohol resin particles composition at a temperature of 40° C. to 120° C. at a pressure of not higher than 20 kPa so as to control an alcohol content of the intermediate acetoacetyl group-containing polyvinyl alcohol resin particles composition obtained by washing the AA-PVA particles at 0.5 to 4 wt. % after the washing to form the acetoacetyl group-containing polyvinyl alcohol resin powder composition.

4. A method of producing the acetoacetyl group-containing polyvinyl alcohol resin powder composition according to claim 2 , the method comprising:
preparing acetoacetyl group-containing polyvinyl alcohol resin particles through a reaction of a powdery polyvinyl alcohol resin with diketene;
washing the acetoacetyl group-containing polyvinyl alcohol resin particles with a C1 to C3 alcohol to remove an unreacted portion of the diketene and thereby to form an intermediate acetoacetyl group-containing polyvinyl alcohol resin particles composition; and
drying the intermediate acetoacetyl group-containing polyvinyl alcohol resin particles composition at a temperature of 40° C. to 120° C. at a pressure of not higher than 20 kPa so as to control an alcohol content of the intermediate acetoacetyl group-containing polyvinyl alcohol resin particles composition obtained by washing the AA-PVA particles at 0.5 to 4 wt. % after the washing to form the acetoacetyl group-containing polyvinyl alcohol resin powder composition.

5. The method of producing the acetoacetyl group-containing polyvinyl alcohol resin powder composition according to claim 3 , wherein a drying period is in a range of 30 to 120 minutes.

6. The method of producing the acetoacetyl group-containing polyvinyl alcohol resin powder composition according to claim 4 , wherein a drying period is in a range of 30 to 120 minutes.

Assignees

• Nippon Synthetic Chem Ind Co Ltd

Inventors

• Yamauchi Yoshihito

Classifications

• C08F8/14 Primary

  Esterification · CPC title

• C08F216/06

  Polyvinyl alcohol {; Vinyl alcohol} · CPC title

• C08K5/05

  Alcohols; Metal alcoholates · CPC title

• C08F16/06

  Polyvinyl alcohol {; Vinyl alcohol} · CPC title

• C08F6/10

  Removal of volatile materials, e.g. solvents {(C08F6/001, C08F6/003, C08F6/005, C08F6/006, C08F6/008, C08F6/02, C08F6/04 take precedence)} · CPC title