Siloxane graft co-polymers for mold release

Patent metadata

Field	Value
Publication number	US-9309412-B2
Application number	US-201113881127-A
Country	US
Kind code	B2
Filing date	Nov 2, 2011
Priority date	Nov 2, 2010
Publication date	Apr 12, 2016
Grant date	Apr 12, 2016

Abstract

A graft co-polymer is provided comprising a vinyl polymeric backbone with grafts of siloxane monomers and monomers containing an anchoring group. Such co-polymers are well suited for coating metal molds. The siloxane groups provide release to the metal mold, while the anchoring groups provide durability to the coating. The durability and release characteristics may be varied by the number of grafts of each monomer and the molecular weight of the siloxane moiety. The co-polymers may be coated from water or organic solvents.

First claim

The invention claimed is:

1. A composition comprising the reaction product of (A) an ethylenically unsaturated siloxane monomer and (B) hydroxyethylmethacrylate phosphate, wherein the hydroxyethylmethacrylate phosphate is present at a concentration of 5%-8% of the total polymer weight.

2. The composition of claim 1 , wherein the siloxane monomer has the general formula X—(Y) n Si(R) 3-m Z m , wherein:
X is a vinyl group;
Y is a divalent linking group;
n is zero or 1;
m is 1, 2, or 3;
Z is a polymeric siloxane moiety; and
R is hydrogen, lower alkyl, aryl, or alkoxy.

3. The composition of claim 2 wherein the siloxane monomer has the formula:

wherein:
m is 1, 2, or 3;
p is 0 or 1;
q is an integer between 2 and 6;
X is a vinyl group;
Z is a polymeric siloxane moiety; and
R is hydrogen, lower alkyl, aryl, or alkoxy.

4. The composition of claim 1 wherein the siloxane monomer is present at a concentration of 25%-99% of the total polymer weight.

5. The composition of claim 4 wherein the siloxane monomer is present at a concentration of 25%-90% of the total polymer weight.

6. The composition of claim 5 wherein the siloxane monomer is present at a concentration of 25%-75% of the total polymer weight.

7. The composition of claim 1 comprising reaction product of (A), (B), and (C) an ethylenically unsaturated fluorinated monomer.

8. The composition of claim 1 comprising the reaction product of (A), (B), and (C) an ethylenically unsaturated non-fluorinated monomer.

9. A metal mold coated with the composition of claim 1 .

10. The composition of claim 1 , wherein the siloxane monomer has the formula:

11. An aqueous composition comprising the reaction product of an ethylenically unsaturated siloxane monomer and hydroxyethylmethacrylate phosphate, wherein the hydroxyethylmethacrylate phosphate has been neutralized with a volatile base, and wherein the hydroxyethylmethacrylate phosphate is present at a concentration of 5%-8% of the total polymer weight.

12. The composition of claim 11 wherein the siloxane monomer has the general formula X—(Y) n Si(R) 3-m Z m , wherein:
X is a vinyl group;
Y is a divalent linking group;
n is zero or 1;
m is 1, 2, or 3;
Z is a polymeric siloxane moiety; and
R is hydrogen, lower alkyl, aryl, or alkoxy.

13. The composition of claim 12 wherein the siloxane monomer has the formula:

wherein:
m is 1, 2, or 3;
p is 0 or 1;
q is an integer between 2 and 6;
X is a vinyl group;
Z is a polymeric siloxane moiety; and
R is hydrogen, lower alkyl, aryl, or alkoxy.

14. The composition of claim 11 wherein the siloxane monomer is present at a concentration of 25%-99% of the total polymer weight.

15. The composition of claim 14 wherein the siloxane monomer is present at a concentration of 25%-90% of the total polymer weight.

16. The composition of claim 15 wherein the siloxane monomer is present at a concentration of 25%-75% of the total polymer weight.

17. A method of making a composition comprising:
reacting an ethylenically unsaturated siloxane monomer and hydroxyethylmethacrylate phosphate in a reaction solvent to form a co-polymer, wherein the hydroxyethylmethacrylate phosphate is present at a concentration of 5%-8% of the total polymer weight.

18. A method of coating a mold comprising:
reacting an ethylenically unsaturated siloxane monomer and hydroxyethylmethacrylate phosphate in a reaction solvent to form a co-polymer, wherein the hydroxyethylmethacrylate phosphate is present at a concentration of 5%-8% of the total polymer weight;
coating a mold with the co-polymer; and
curing the coated co-polymer.

19. The method of coating a mold of claim 18 , the method comprising:
reacting an ethylenically unsaturated siloxane monomer and hydroxyethylmethacrylate phosphate in a reaction solvent to form a co-polymer;
mixing the co-polymer with a volatile base to form a neutralized co-polymer;
mixing the neutralized co-polymer with water to form an aqueous coating mixture;
coating a mold with the aqueous coating mixture; and
curing the coated co-polymer.

20. The method of coating a mold of claim 18 , the method comprising:
reacting an ethylenically unsaturated siloxane monomer and an ethylenically unsaturated monomer containing a basic vinyl pyridine anchoring group in a reaction solvent to form a co-polymer;
mixing the co-polymer with a volatile acid to form a neutralized co-polymer;
mixing the neutralized co-polymer with water to form an aqueous coating mixture;
coating a mold with the aqueous coating mixture; and
curing the coated co-polymer.

Assignees

• Jariwalla Chetan P
• Iyer Suresh
• Hanschen Thomas P
• 3M Innovative Properties Co

Inventors

• Jariwalla Chetan P
• Iyer Suresh
• Hanschen Thomas P

Classifications

• C08G77/20

  containing silicon bound to unsaturated aliphatic groups · CPC title

• B29K2096/02

  Graft polymers · CPC title

• C08G77/442

  containing vinyl polymer sequences · CPC title

• C08F230/08

  containing silicon · CPC title

• C08F2220/282

  Chemistry & Metallurgy · mapped topic