Heat-activatable adhesive article

• US 5,589,246 A
• Filed: 10/17/1994
• Issued: 12/31/1996
• Est. Priority Date: 10/17/1994
• Status: Expired due to Fees

• Current Assignee: Minnesota Mining and Manufacturing Co (3M Company)
• Original Assignee: Minnesota Mining and Manufacturing Co (3M Company)
• Inventors: Koskenmaki, David C., Calhoun, Clyde D.
• Primary Examiner(s): Ahmad, Nasser
• Application Number:
  US08/324,333
• Time in Patent Office: 806 Days
• Field of Search: 428/40, 428/120, 428/119, 428/156, 428/173, 428/343, 428/353, 428/167, 428/354, 428/182, 428/355, 604/389, 604/390, 604/272.2
• US Class Current: 428/120
• CPC Class Codes: C09J 2301/206 the adhesive layer comprising non-adhesive protrusions
• CPC Class Codes: C09J 7/22 Plastics; Metallised plastics
• CPC Class Codes: C09J 7/35 Heat-activated
• CPC Class Codes: Y10T 428/24174 including sheet or component perpendicular to plane of web or sheet
• CPC Class Codes: Y10T 428/24182 Inward from edge of web or sheet
• CPC Class Codes: Y10T 428/24479 including variation in thickness
• CPC Class Codes: Y10T 428/2457 Parallel ribs and/or grooves
• CPC Class Codes: Y10T 428/2462 with partial filling of valleys on outer surface
• CPC Class Codes: Y10T 428/24694 Parallel corrugations
• CPC Class Codes: Y10T 428/2843 including a primer layer
• CPC Class Codes: Y10T 428/2848 Three or more layers
• CPC Class Codes: Y10T 428/2852 Adhesive compositions
• CPC Class Codes: Y10T 428/2891 including addition polymer from alpha-beta unsaturated carboxylic acid [e.g., acrylic acid, methacrylic acid, etc.] Or derivative thereof

Abstract

A heat-activatable adhesive article is provided. The article, preferably a tape, includes a substantially laterally stable heat recoverable carrier film having at least one surface comprising a recessed surface portion and a raised surface portion therein; and an adhesive layer in the recessed surface portion in an amount such that the adhesive does not extend above the raised surface portion thereby forming an exposed raised surface portion. In use, the carrier film recovers upon exposure to heat thereby allowing the adhesive in the recessed surface portion to contact a substrate. The heat-activatable adhesive article can be positionable, repositionable, or both.

Claims

1. A heat-activatable adhesive article comprising:

(a) a substantially laterally stable heat recoverable carrier film of memory shaped material and having at least one surface comprising a recessed surface portion and a raised surface portion therein; and

(b) an adhesive layer in the recessed surface portion in an amount such that the adhesive does not extend above the raised surface portion thereby forming an exposed raised surface portion.

2. The heat-activatable adhesive article of claim 1 wherein the exposed raised surface portion is substantially nontacky such that the article is positionable.

3. The heat-activatable adhesive article of claim 2 wherein the adhesive is a repositionable adhesive.

4. The heat-activatable adhesive article of claim 2 wherein the exposed raised surface portion is substantially free of adhesive.

5. The heat-activatable adhesive article of claim 1 wherein the exposed raised surface portion has an adhesive coating thereon which is sufficiently tacky to make the article repositionable.

6. The heat-activatable adhesive article of claim 1 wherein the adhesive is a pressure sensitive adhesive.

7. The heat-activatable adhesive article of claim 1 wherein the recessed surface portion comprises a plurality of recesses in a substantially spaced-apart relationship to one another.

8. The heat-activatable adhesive article of claim 7 wherein the recesses are of three dimensional shape having a cross-section of oval, circular, polygonal, or rectangular shape;

the cross-section taken parallel to the surfaces of the carrier film.

9. The heat-activatable adhesive article of claim 1 wherein the recessed surface portion comprises one continuous recess.

10. The heat-activatable adhesive article of claim 1 wherein the raised surface portion comprises a plurality of projections in a substantially spaced-apart relationship to one another.

11. The heat-activatable adhesive article of claim 10 wherein the projections are substantially uniformly distributed.

12. The heat-activatable adhesive article of claim 1 wherein the raised surface portion comprises one continuous projection.

13. The heat-activatable adhesive article of claim 1 wherein the carrier film is a polyolefin, polyvinyl chloride, or polyester.

14. The heat-activatable adhesive article of claim 1 wherein the carrier film with a raised surface portion comprises a backing material having stand-offs adhered thereto.

15. The heat-activatable adhesive article of claim 1 wherein the substantially laterally stable heat recoverable carrier film further comprises:

(a) a second surface comprising a recessed surface portion and a raised surface portion therein; and

(b) an adhesive in the recessed surface portion of the second surface in an amount such that the adhesive does not extend above the raised surface portion thereby forming an exposed raised surface portion.

16. The heat-activatable adhesive article of claim 1 further comprising a release coating between the carrier film and the pressure sensitive adhesive thereby forming a transfer article.

17. A heat-activatable positionable adhesive tape comprising:

(a) a carrier film having two oppositely parallel surfaces wherein at least one of the surfaces comprises at least one recess that is substantially continuous and interrupted by projections protruding therefrom,

(b) a pressure sensitive adhesive in the recess;

wherein the carrier film recovers upon exposure to heat thereby allowing the adhesive in the recess to contact a substrate.

18. The heat-activatable positionable adhesive tape of claim 17 further comprising a release coating between the carrier film and the pressure sensitive adhesive thereby forming a transfer tape.

19. The heat-activatable positionable adhesive tape of claim 18 wherein the projections result in perforations in the adhesive upon transfer to the substrate and wherein the projections provide spaces for liquids and gases to pass through the adhesive.

20. The heat-activatable positionable adhesive tape of claim 17 wherein the projections in the carrier film recover upon exposure to heat thereby allowing the adhesive in the recess to contact the substrate.

21. A method of adhering a heat-activatable adhesive article to a substrate comprising:

(a) applying the heat-activatable adhesive article to the substrate;

wherein the heat-activatable adhesive article comprises;

(i) a substantially laterally stable heat recoverable carrier film of memory shaped material and having at least one surface comprising a recessed surface portion and a raised surface portion therein; and

(ii) an adhesive layer in the recessed surface portion in an amount such that the adhesive does not extend above the raised surface portion thereby forming an exposed raised surface portion; and

(b) applying a sufficient amount of heat to the heat-activatable adhesive article such that the carrier film is modified to allow the adhesive in the recessed surface portion to contact the substrate.

22. The method of claim 21 wherein the exposed raised surface portion is substantially nontacky such that the article is positionable.

23. The method of claim 21 wherein the adhesive is a repositionable adhesive.

24. The method of claim 21 wherein the exposed raised surface portion has an adhesive coating thereon which is sufficiently tacky to make the article repositionable.

25. The method of claim 21 wherein the adhesive is a pressure sensitive adhesive.