FLUOROSILICONE BLEND RELEASE MATERIALS

• US 20120219794A1
• Filed: 12/14/2009
• Published: 08/30/2012
• Est. Priority Date: 11/16/2009
• Status: Active Grant

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Seth, Jayshree, Boulos, Marie A., Qiu, Zai-Ming, Venne, Janet A.
• Granted Patent: US 9,206,317 B2
• Time in Patent Office: Days
• US Class Current: 428/352
• CPC Class Codes: C08G 77/12 containing silicon bound to hydrogen C08G77/045 takes precedence
• CPC Class Codes: C08G 77/20 containing silicon bound to unsaturated aliphatic groups C08G77/045 takes precedence
• CPC Class Codes: C08G 77/24 halogen-containing groups
• CPC Class Codes: C08K 5/01 Hydrocarbons C08K5/0091 takes precedence
• CPC Class Codes: C08K 5/05 Alcohols; Metal alcoholates
• CPC Class Codes: C08K 5/06 Ethers; Acetals; Ketals; Ortho-esters
• CPC Class Codes: C08K 5/07 Aldehydes; Ketones
• CPC Class Codes: C08K 5/5406 containing elements other than oxygen or nitrogen
• CPC Class Codes: C08K 5/56 Organo-metallic compounds, i.e. organic compounds containing a metal-to-carbon bond
• CPC Class Codes: C08L 2666/14 Macromolecular compounds according to C08L59/00 - C08L87/00; Derivatives thereof
• CPC Class Codes: C08L 83/00 Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 83/08 containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen
• CPC Class Codes: C09D 183/08 containing silicon bound to organic groups containing atoms other than carbon, hydrogen, and oxygen
• CPC Class Codes: C09J 2483/005 in the release coating
• CPC Class Codes: C09J 7/401 characterised by the release coating composition
• CPC Class Codes: Y10T 428/2839 with release or antistick coating

Abstract

Release compositions comprising a blend of ethylenically unsaturated fluoroorganopolysiloxane polymers and ethylenically unsaturated non-fluorinated organopolysiloxane polymers are described. The release compositions are dispersed in a solvent system and also contain a catalyst and at least one crosslinker. Both fluoroorganohydrogenpolysiloxane and organohydrogenpolysiloxane are described. Release liners and adhesive articles including cured release compositions are also disclosed.

Claims

1. A coatable release solution comprising a solvent system and a curable release composition dissolved in the solvent system, wherein the curable release composition comprises

(a) an ethylenically unsaturated fluoroorganopolysiloxane polymer;

(b) a non-fluorinated organopolysiloxane polymer comprising an average of at least two ethylenically unsaturated organic groups;

(c) a hydrosilation catalyst; and

(d) at least one crosslinker selected from the group consisting of

(i) a fluoroorganohydrogenpolysiloxane and

(ii) an organohydrogenpolysiloxane.

2. The coatable release solution of claim 1, wherein the non-fluorinated organopolysiloxane polymer has a vinyl equivalent weight of no greater than 60,000 grams per equivalent.

3. The coatable release solution according to claim 2, wherein the non-fluorinated organopolysiloxane polymer has a vinyl equivalent weight of 2000 to 5000 grams per equivalent.

4. The coatable release solution according to claim 1, wherein the ethylenically unsaturated fluoroorganopolysiloxane polymer comprises an average of at least two ethylenically unsaturated organic groups.

5. The coatable release solution according to claim 1, wherein fluoroorganopolysiloxane polymer comprises a siloxane backbone and pendant C1 to C6 perfluoroalkyl groups bonded to backbone with a linking group.

6. The coatable release solution according to claim 5, wherein the linking group is an alkylene group comprising at least two carbon atoms.

7. The coatable release solution according to claim 5, wherein the pendant perfluoroalkyl group is —

C₄F₉.

8. The coatable release solution according to claim 1, wherein the weight ratio of non-fluorinated organopolysiloxane to fluoroorganopolysiloxane is between 50:

50 and 95;

5, inclusive.

9. The coatable release solution of claim 8, wherein the weight ratio of non-fluorinated organopolysiloxane to fluoroorganopolysiloxane is between 75:

25 and 90;

10, inclusive.

10. The coatable release solution according to claim 1, wherein the solvent system comprises a polar solvent and a non-polar solvent, optionally wherein the solvent system comprises at least 50 percent by weight of the polar solvent.

11. The coatable release solution according to claim 1, wherein the curable release composition comprises both the fluoroorganohydrogenpolysiloxane crosslinker and the organohydrogenpolysiloxane crosslinker.

13. A release liner comprising a substrate and a release layer bonded to the substrate, wherein the release layer comprises the cured coatable release solution according to claim 1.

14. An adhesive article comprising an adhesive bonded to the release layer of the release liner according to claim 13.

12. A curable release composition consisting essentially of

(a) the at least one ethylenically unsaturated fluoroorganopolysiloxane polymer;

(b) the at least one non-fluorinated organopolysiloxane polymer comprising an average of at least two ethylenically unsaturated organic groups;

(c) the at least one hydrosilation catalyst;

(d) the at least one crosslinker selected from the group consisting of

(i) the fluoroorganohydrogenpolysiloxane and

(ii) the organohydrogenpolysiloxane; and

(e) at least one cure inhibitor.

15. An adhesive article comprising

(I) a release liner comprising a substrate and a cured release composition on at least one surface of the substrate, wherein the release composition comprises

(a) an ethylenically unsaturated organopolysiloxane base polymer having a vinyl equivalent weight of 400 to 25,000 grams per equivalent and a weight average molecular weight of 800 to 50,000 grams per mole;

(b) an ethylenically unsaturated fluoroorganopolysiloxane polymer;

(c) a hydrosilation catalyst; and

(d) at least one crosslinker selected from the group consisting of

(i) an fluoroorganohydrogenpolysiloxane and

(ii) an organohydrogenpolysiloxane; and

(II) a pressure-sensitive adhesive in contact with the release composition.

16. The adhesive article of claim 15, further comprising a backing adhered to the adhesive opposite the release liner.

17. The adhesive article according to claim 15, wherein the adhesive comprises a silicone adhesive.

18. The adhesive article according to claim 15, wherein the adhesive comprises an acrylate adhesive.