Silicone pressure sensitive adhesive and articles

• US 7,407,709 B2
• Filed: 12/22/2003
• Issued: 08/05/2008
• Est. Priority Date: 12/22/2003
• Status: Expired due to Fees

• 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
• Primary Examiner(s): PENG, KUO LIANG
• Application Number:
  US10/744,212
• Publication Number:
  US 20050136266A1
• Time in Patent Office: 1,688 Days
• Field of Search: 428/447, 525/474, 524/588, 528/28
• US Class Current: 428/447
• 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 medical device comprising:

a substrate; and

a pressure sensitive adhesive composition disposed on the substrate;

wherein the adhesive exhibits a 180°

peel adhesion force from polypropylene of less than 100 g/linear inch at a rate of 90 inches per minute and the adhesive composition comprises an unreactive mixture of

about 10 wt-% to about 20 wt-% 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 about 60 wt-% of silicate tackifying resin.

2. The medical device 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.

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

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

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

6. The medical device of claim 1 further comprising a tie layer disposed between the substrate and the adhesive.

7. The medical device of claim 6 wherein the tie layer composition comprises the same components as the adhesive and further comprises polymeric fibers.

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

10₅ Pa at about 25°

C.

9. The medical device of claim 1 wherein the adhesive exhibits a peel force from polypropylene of at least 3 g/linear inch (2.54 cm).

10. The medical device of claim 1 wherein the adhesive exhibits a peel force from polypropylene of at least about 10 g/linear inch.

11. The medical device of claim 1 wherein the medical device further comprises a scrim.

12. The medical device of claim 1 wherein the device further comprises a release liner temporarily covering the adhesive.

13. A medical device comprising:

a substrate; and

a pressure sensitive adhesive composition disposed on the substrate;

wherein the adhesive composition comprises an unreactive mixture of

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

30 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 about 60 wt-% of silicate tackifying resin.

14. The medical device of claim 13 wherein the diluent is a silicone fluid.

15. The medical device of claim 13 wherein the adhesive exhibits a 1800 peel adhesion force from polypropylene of less than 500 g/linear inch at a rate of 90 inches per minute.

16. The medical device of claim 13 wherein the adhesive exhibits a 180°

peel adhesion force from polypropylene of less than 200 g/linear inch at a rate of 90 inches per minute.

17. 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.