SILICONE PRESSURE SENSITIVE ADHESIVE AND ARTICLES

• US 20080268242A1
• Filed: 06/30/2008
• Published: 10/30/2008
• Est. Priority Date: 12/22/2003
• Status: Active Grant

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Dunshee, Wayne K., Winkler, Wendi J., Sherman, Audrey A., Zhou, Zhiming
• Granted Patent: US 7,807,268 B2
• Time in Patent Office: Days
• US Class Current: 428/355N
• CPC Class Codes: A61L 15/58 Adhesives
• CPC Class Codes: C08G 18/324 containing only one aromatic ring
• CPC Class Codes: C08G 18/61 Polysiloxanes
• CPC Class Codes: C08G 2170/40 Compositions for pressure-sensitive adhesives
• 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 83/02 Polysilicates
• CPC Class Codes: C08L 83/04 Polysiloxanes
• CPC Class Codes: C08L 83/10 Block- or graft-copolymers containing polysiloxane sequences obtained by polymerising a compound having a carbon-to-carbon double bond on to a polysiloxane C08L51/08, C08L53/00
• CPC Class Codes: C09J 175/04 Polyurethanes
• CPC Class Codes: C09J 183/10 Block or graft copolymers containing polysiloxane sequences obtained by polymerising a compound having a carbon-to-carbon double bond on to a polysiloxane C09J151/08, C09J153/00
• CPC Class Codes: Y10T 428/2896 including nitrogen containing condensation polymer [e.g., polyurethane, polyisocyanate, etc.]
• CPC Class Codes: Y10T 428/31663 As siloxane, silicone or silane

Abstract

Pressure sensitive adhesive compositions comprising an unreactive mixture of polydiorganosiloxane polyurea copolymer, diluent, and silicate tackifying resin. The compositions are useful for articles such as medical devices.

Claims

1. A pressure sensitive adhesive composition comprising an unreactive mixture of

about 10 wt-% to about 20 wt-% of a polydiorganosiloxane polyurea copolymer;

30 wt-% to 50 wt-% of a diluent, wherein the diluent has a number average molecular weight of no more than about 30,000 g/mole; and

greater than 30 wt-% to less than 60 wt-% of silicate tackifying resin;

wherein the adhesive exhibits a 180°

peel adhesion force from polypropylene of less than 500 g/linear inch at a rate of 90 inches per minute.

2. The adhesive of claim 1 wherein the adhesive exhibits a 1800 peel adhesion force from polypropylene of less than 200 g/linear inch at a rate of 90 inches per minute

3. The adhesive of claim 1 wherein the polydiorganosiloxane polyurea copolymer comprises unreactive end groups.

4. The adhesive of claim 1 wherein the polydiorganosiloxane polyurea copolymer comprises end groups having ethylenic unsaturation.

5. The adhesive of claim 1 wherein the diluent is a silicone fluid.

6. The adhesive of claim 1 wherein the diluent is substantially free of functional groups that react with the polydiorganosiloxane polyurea copolymer and silicate tackifying resin of the adhesive composition.

7. The adhesive of claim 1 wherein the adhesive has a loss modulus of no greater than 1×

10⁵ Pa at about 25°

C.

8. An article comprising:

a substrate;

the pressure sensitive adhesive composition of claim 1 disposed on the substrate.

12. The article of claim 8 wherein the substrate is selected from the group consisting of polymer films, metallic foils, and combinations thereof.

13. The article of claim 12 wherein substrate is a polymer film selected from the group consisting of polyacetate, polyacrylic, polyester, polyurethane, polyvinylchloride, polystyrene, and combinations thereof.

14. The article of claim 8 wherein the substrate has stretch release properties.

15. The article of claim 8 wherein the substrate is a release liner.

16. The article of claim 8 wherein the adhesive exhibits a 180°

peel adhesion force from polypropylene of at least 5 g/linear inch at a rate of 90 inches per minute.

17. The article of claim 8 wherein the adhesive exhibits a 180°

peel adhesion force from polypropylene of at least 10 g/linear inch at a rate of 90 inches per minute.

18. The pressure sensitive adhesive composition of claim 1 wherein the adhesive cleanly removes from the polypropylene without leaving a sticky residue.

19. The pressure sensitive adhesive composition of claim 1 wherein the adhesive is clear.

20. The pressure sensitive adhesive composition of claim 1 wherein the adhesive exhibits a 180°

peel adhesion force from polypropylene of at least 5 g/linear inch at a rate of 90 inches per minute.

21. The pressure sensitive adhesive composition of claim 1 wherein the adhesive exhibits a 180°

peel adhesion force from polypropylene of at least 10 g/linear inch at a rate of 90 inches per minute.

9-11. -11. (canceled)