Methods of making a pressure-sensitive adhesive assembly

• US 7,833,577 B2
• Filed: 05/11/2007
• Issued: 11/16/2010
• Est. Priority Date: 05/11/2007
• Status: Active Grant

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Malmer, Jeffrey D., Bries, James L., Sheridan, Margaret M.
• Primary Examiner(s): Kornakov; Michael
• Assistant Examiner(s): ZHAO, XIAO SI
• Application Number:
  US11/747,530
• Publication Number:
  US 20080280037A1
• Time in Patent Office: 1,285 Days
• Field of Search: 427/207.1, 428/40.1, 428/343, 428/447, 248/205.3, 248/304
• US Class Current: 427/207.1
• CPC Class Codes: C09J 2301/1242 the opposite adhesive layers being different
• 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 2407/00 Presence of natural rubber
• CPC Class Codes: C09J 2409/00 Presence of diene rubber
• CPC Class Codes: C09J 2411/00 Presence of chloroprene
• CPC Class Codes: C09J 2433/00 Presence of (meth)acrylic polymer
• CPC Class Codes: C09J 2483/00 Presence of polysiloxane
• CPC Class Codes: C09J 7/10 without carriers
• CPC Class Codes: Y10T 428/14 Layer or component removable to expose adhesive
• CPC Class Codes: Y10T 428/28 Web or sheet containing structurally defined element or component and having an adhesive outermost layer
• CPC Class Codes: Y10T 428/31663 As siloxane, silicone or silane

Abstract

A method of making a pressure-sensitive adhesive assembly, the method including coating a pressure-sensitive adhesive composition that includes a silicone polymer on a first major surface of a first release liner to form a first layer, coating a composition on the first layer to form a second layer, the composition of the second layer including an elastomer, at least one of the pressure-sensitive adhesive composition of the first layer and the composition of the second layer being in an uncured state during the coating of the second layer, and curing at least one of the first layer and the second layer, the first pressure-sensitive adhesive composition of the multi-layer assembly exhibiting a release force to the release liner of no greater than 100 gram per 0.5 inch width after the multi-layer assembly has been stored for 46 days at 120° F.

Claims

1. A method of making a pressure-sensitive adhesive assembly, the method comprising:

coating a pressure-sensitive adhesive composition comprising a silicone polyurea block copolymer on a first major surface of a first release liner to form a first layer;

coating a composition on the first layer to form a second layer, the composition of the second layer comprising an elastomer,

at least one of the pressure-sensitive adhesive composition of the first layer and the composition of the second layer being in an uncured state during the coating of the second layer; and

curing at least one of the first layer and the second layer,

the first pressure-sensitive adhesive composition of the multi-layer assembly exhibiting a release force to the release liner of no greater than 100 gram per 0.5 inch width after the multi-layer assembly has been stored for 46 days at 120°

F.

2. The method of claim 1 further comprising rolling the multi-layer assembly upon itself in the form of a roll.

3. The method of claim 1, wherein the curing comprises at least one of cooling, drying, crosslinking or a combination thereof.

4. The method of claim 1, wherein coating the second layer comprises extruding, dry laminating, spray coating, solvent coating, hot melt coating, slot die, knife, slot fed knife, gravure, rod, curtain coating, or a combination thereof.

5. The method of claim 1, wherein the composition of the second layer comprises a pressure-sensitive adhesive composition.

6. The method of claim 1, wherein the composition of the second layer comprises a silicone polymer different from the silicone polymer of the pressure-sensitive adhesive composition of the first layer, acrylic resin, natural rubber, polychloroprene, nitrile rubber, butyl rubber, polysulfide rubber, polyisoprene, ethylene-propylene diene rubber, polyurethane, acrylonitrile-butadiene rubber, acrylonitrile-butadiene-styrene, styrene-butadiene, styrene-butadiene-styrene, styrene-isoprene-styrene, styrene-ethylene-propylene-styrene, styrene-ethylene-butylene-styrene or a combination thereof.

7. The method of claim 6, wherein the composition of the second layer comprises a pressure-sensitive adhesive composition.

8. The method of claim 1, wherein the pressure-sensitive adhesive composition of the first layer is uncured during the coating of the second layer on the first layer and the composition of the second layer comprises a pressure-sensitive adhesive composition.

9. The method of claim 1, wherein the second layer is uncured during the coating of the second layer on the first layer.

10. The method of claim 1, wherein the first layer and the second layer are uncured during the coating of the second layer on the first layer.

11. The method of claim 1 further comprising priming at least one of the first layer and the second layer prior to contacting the first layer with the second layer.

12. The method of claim 1, wherein when the release liner is removed from the resulting multilayer assembly and the assembly is bonded to a painted drywall surface through the first layer, the assembly exhibits a static shear to the painted drywall of at least 30,000 minutes.

13. The method of claim 1, wherein when the release liner is removed from the resulting multilayer assembly and the assembly is bonded to a glass substrate through the first layer, the assembly exhibits a static shear to the glass substrate of at least 30,000 minutes.

14. The method of claim 1, wherein when the release liner is removed from the resulting multilayer assembly and the assembly is bonded to a glass substrate through the first layer, the assembly exhibits a static shear to the glass substrate of at least 30,000 minutes at 90% relative humidity and 90°

F.

15. The method of claim 1, wherein the first and second layers are coated on each other substantially simultaneously.

16. The method of claim 1, wherein the first and second layers are coated on each other sequentially.

17. A method of making a pressure-sensitive adhesive assembly, the method comprising:

coating a first composition comprising a pressure-sensitive adhesive composition comprising a silicone polyurea block copolymer on a first major surface of a first release liner to form a first layer;

coating a second composition on a second release liner, the second composition comprising an elastomer;

contacting the first composition and the second composition to form a multi-layer assembly,

the first composition of the multi-layer assembly exhibiting a release force to the first release liner of no greater than 100 gram per 0.5 inch width after the multi-layer assembly has been stored for 46 days at 120°

F.