Organosiloxane graft polyvinyl alcohol polymer and method of producing the same

Patent metadata

Field	Value
Publication number	US-10208138-B2
Application number	US-201715477318-A
Country	US
Kind code	B2
Filing date	Apr 3, 2017
Priority date	May 12, 2016
Publication date	Feb 19, 2019
Grant date	Feb 19, 2019

Abstract

An organosiloxane graft polyvinyl alcohol polymer contains a structural unit shown by the following general formula (1),

wherein M 1 and M 2 represent a hydrogen atom, an acetyl group, or a siloxane group shown by the following general formula (2), provided that at least one of M 1 and M 2 is a siloxane group shown by the general formula (2); and A represents a single bond or a linking group,

wherein R 1 represents a monovalent organic group having 1 to 6 carbon atoms; R 2 , R 3 , and R 4 each represent a monovalent organic group having 1 to 6 carbon atoms or a siloxy group shown by —OSiR 5 R 6 R 7 , where R 5 , R 6 , and R 7 each represent a monovalent organic group having 1 to 6 carbon atoms; “n” represents an integer of 1 to 10; and “a” represents an integer of 0 to 2.

First claim

What is claimed is:

1. An organosiloxane graft polyvinyl alcohol polymer comprising a structural unit shown by the following general formula (1),

wherein M 1 and M 2 represent a hydrogen atom, an acetyl group, or a siloxane group shown by the following general formula (2), provided that at least one of M 1 and M 2 is a siloxane group shown by the general formula (2); and A represents a single bond or a linking group,

wherein R 1 represents a monovalent organic group having 1 to 6 carbon atoms; R 2 , R 3 , and R 4 each represent a monovalent organic group having 1 to 6 carbon atoms or a siloxy group shown by —OSiR 5 R 6 R 7 , where R 5 , R 6 , and R 7 each represent a monovalent organic group having 1 to 6 carbon atoms; “n” represents an integer of 1 to 10; and “a” represents an integer of 0 to 2.

2. The organosiloxane graft polyvinyl alcohol polymer according to claim 1 , further comprising a structural unit shown by the following general formula (3) with a number average molecular weight (Mn) of 5,000 to 500,000 as measured by GPC in terms of polystyrene,

wherein M 3 represents a hydrogen atom, an acetyl group, or a siloxane group shown by the general formula (2).

3. The organosiloxane graft polyvinyl alcohol polymer according to claim 1 , wherein in the general formula (2), “n” is 3, R 2 , R 3 , and R 4 are methyl groups, and “a” is 0.

4. The organosiloxane graft polyvinyl alcohol polymer according to claim 2 , wherein in the general formula (2), “n” is 3, R 2 , R 3 , and R 4 are methyl groups, and “a” is 0.

5. A method of producing an organosiloxane graft polyvinyl alcohol polymer, comprising reacting a polyvinyl alcohol resin compound containing a structural unit shown by the following general formula (4) with an isocyanate group-containing organopolysiloxane shown by the following general formula (5),

wherein A represents a single bond or a linking group,

wherein R 1 represents a monovalent organic group having 1 to 6 carbon atoms; R 2 , R 3 , and R 4 each represent a monovalent organic group having 1 to 6 carbon atoms or a siloxy group shown by —OSiR 5 R 6 R 7 , where R 5 , R 6 , and R 7 each represent a monovalent organic group having 1 to 6 carbon atoms; “n” represents an integer of 1 to 10; and “a” represents an integer of 0 to 2.

6. The method of producing an organosiloxane graft polyvinyl alcohol polymer according to claim 5 , wherein the polyvinyl alcohol resin compound further contains a structural unit shown by the following formula (6).

7. The method of producing an organosiloxane graft polyvinyl alcohol polymer according to claim 5 , wherein the isocyanate group-containing organopolysiloxane shown by the general formula (5) is tristrimethylsiloxysilylpropyl isocyanate.

8. The method of producing an organosiloxane graft polyvinyl alcohol polymer according to claim 6 , wherein the isocyanate group-containing organopolysiloxane shown by the general formula (5) is tristrimethylsiloxysilylpropyl isocyanate.

Assignees

• Shinetsu Chemical Co

Inventors

• Hagiwara Mamoru

Classifications

• C08F8/12

  Hydrolysis · CPC title

• C08F116/06

  Polyvinyl alcohol {; Vinyl alcohol} · CPC title

• C08G18/6212 Primary

  Polymers of alkenylalcohols; Acetals thereof; Oxyalkylation products thereof · CPC title

• C08F8/42 Primary

  Introducing metal atoms or metal-containing groups · CPC title

• C08G18/718

  containing silicon · CPC title