SILICONE GEL ADHESIVE CONSTRUCTION

• US 20100267302A1
• Filed: 04/15/2010
• Published: 10/21/2010
• Est. Priority Date: 04/17/2009
• Status: Abandoned Application

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Brown, Mary L., Lewis, Terry W., KANTNER, Steven S.
• Application Number:
  US12/761,118
• Publication Number:
  US 20100267302A1
• Time in Patent Office: Days
• US Class Current: 442/71
• CPC Class Codes: A61F 13/0256 characterized by the parametric properties of the adhesive
• CPC Class Codes: A61L 15/585 Mixtures of macromolecular compounds
• 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: C08L 33/06 of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
• CPC Class Codes: C08L 83/04 Polysiloxanes
• CPC Class Codes: C09J 133/08 Homopolymers or copolymers of acrylic acid esters
• CPC Class Codes: C09J 183/04 Polysiloxanes
• CPC Class Codes: C09J 2301/208 the adhesive layer being constituted by at least two or more adjacent or superposed adhesive layers, e.g. multilayer adhesive
• CPC Class Codes: C09J 2400/263 in the substrate
• CPC Class Codes: C09J 2433/00 Presence of (meth)acrylic polymer
• CPC Class Codes: C09J 2475/006 in the substrate
• CPC Class Codes: C09J 2483/00 Presence of polysiloxane
• CPC Class Codes: C09J 7/21 Paper; Textile fabrics
• CPC Class Codes: C09J 7/38 Pressure-sensitive adhesives [PSA]
• CPC Class Codes: D06N 2211/22 Patches, e.g. medical patches, repair patches
• CPC Class Codes: D06N 3/042 Acrylic polymers D06N3/045 takes precedence
• CPC Class Codes: D06N 3/128 with silicon polymers
• CPC Class Codes: D06N 3/183 the layers are one next to the other
• CPC Class Codes: Y10T 428/249983 As outermost component
• CPC Class Codes: Y10T 442/2098 : At least two coatings or impregnations of different chemical composition

Abstract

A silicone gel adhesive construction comprises (a) a porous backing, (b) an acrylic copolymer pressure sensitive adhesive layer on at least a portion of one side of the porous backing, and (c) a cured silicone gel adhesive on the pressure sensitive adhesive layer.

Claims

1. A silicone gel adhesive construction comprising:

(a) a porous backing,

(b) an acrylic copolymer pressure sensitive adhesive layer on at least a portion of one side of the porous backing, and

(c) a cured silicone gel adhesive on the pressure sensitive adhesive layer.

2. The silicone gel adhesive construction of claim 1 wherein the pressure sensitive adhesive layer substantially seals the at least a portion of one side of the porous backing.

3. The silicone gel adhesive construction of claim 1 wherein the construction has a moisture vapor transmission rate of at least about 300 g/m²/24 hours.

4. The silicone gel adhesive construction of claim 3 wherein the construction has a moisture vapor transmission rate of at least about 600 g/m²/24 hours.

5. The silicone gel adhesive construction of claim 1 wherein the porous backing comprises a non-woven material.

6. The silicone gel adhesive construction of claim 5 wherein the porous backing comprises a non-woven melt-blown polyurethane material.

7. The silicone gel adhesive construction of claim 1 wherein the coating weight of the acrylic copolymer pressure sensitive adhesive layer is from about 15 g/m² to about 80 g/m².

8. The silicone gel adhesive construction of claim 7 wherein the coating weight of the acrylic copolymer pressure sensitive adhesive layer is from about 20 g/m² to about 45 g/m².

9. The silicone gel adhesive construction of claim 1 wherein the coating weight of the silicone gel adhesive is from about 20 g/m² to about 150 g/m².

10. The silicone gel adhesive construction of claim 9 wherein the coating weight of the silicone gel adhesive is from about 40 g/m² to about 120 g/m².

11. The silicone gel adhesive construction of claim 1 wherein the silicone gel adhesive is from about 0.8 mils to about 6 mils thick.

12. The silicone gel adhesive construction of claim 1 wherein the silicone gel adhesive was formed from a hydrosilation reaction between an alpha-omega vinyl terminated polydimethyl siloxane and a Si—

H containing siloxane catalyzed by a platinum catalyst.

13. The silicone gel adhesive construction of claim 1 wherein the silicone gel adhesive is selected for the group consisting of Blue Star Silicones Silbione™

RT Gel 4317, Dow Corning MG 7-9850 Soft Skin Adhesive (SSA), and Wacker SilGel™

612.

14. The silicone gel adhesive construction of claim 1 wherein the pressure sensitive adhesive comprises a majority of 2-ethylhexyl acrylate or butyl acrylate and a minor amount of acrylic acid or acrylamide.

15. The silicone gel adhesive construction of claim 1 wherein the pressure sensitive adhesive is an emulsion polymer or a hot melt polymer.

16. A method for making a silicone gel adhesive construction comprising:

(a) substantially sealing at least a portion of one side of a porous backing with an acrylic copolymer pressure sensitive adhesive,

(b) coating a silicone adhesive gel precursor on the pressure sensitive adhesive, and

(c) curing the silicone adhesive gel precursor.

19. The method of claim 16 or 17 wherein substantially sealing at least a portion of one side of the porous backing with pressure sensitive adhesive comprises coating acrylic copolymer on at least a portion of one side of the porous backing.

20. The method of claim 19 wherein coating acrylic copolymer on the porous backing comprises coating a water-based emulsion polymer or coating a 100% solids hot-melt polymer.

21. The method of claim 16 or 17 wherein substantially sealing at least a portion of one side of the porous backing with pressure sensitive adhesive comprises coating acrylic copolymer on a release liner and laminating the acrylic copolymer to at least a portion of one side of the porous backing.

17. A method for making a silicone gel adhesive construction comprising:

(a) substantially sealing at least a portion of one side of a porous backing with an acrylic copolymer pressure sensitive adhesive, and

(b) laminating a cured silicone gel adhesive to the pressure sensitive adhesive.

18. The method of claim 17 wherein the cured silicone gel adhesive is provided on a release liner.