Pressure sensitive adhesives with a fibrous reinforcing material

• US 6,756,098 B2
• Filed: 06/25/2002
• Issued: 06/29/2004
• Est. Priority Date: 01/17/2001
• Status: Expired due to Term

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Everaerts, Albert I., Zhou, Zhiming
• Primary Examiner(s): Ahmad, Nasser
• Application Number:
  US10/180,784
• Publication Number:
  US 20020187294A1
• Time in Patent Office: 735 Days
• Field of Search: 428/40.1, 428/40.2, 428/41.3, 428/41.5, 428/41.9, 428/42.1, 428/212, 428/220
• US Class Current: 428/40.1
• CPC Class Codes: A61L 15/58 Adhesives
• CPC Class Codes: B33Y 80/00 Products made by additive manufacturing
• CPC Class Codes: C08L 2205/16 Fibres; Fibrils
• CPC Class Codes: C08L 2666/02 Organic macromolecular compounds, natural resins, waxes or and bituminous materials
• CPC Class Codes: C09J 11/08 Macromolecular additives
• CPC Class Codes: C09J 133/06 of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
• CPC Class Codes: C09J 2301/302 the adhesive being pressure-sensitive, i.e. tacky at temperatures inferior to 30°C
• CPC Class Codes: C09J 2301/308 the adhesive tape or sheet losing adhesive strength when being stretched, e.g. stretch adhesive
• CPC Class Codes: C09J 2433/00 Presence of (meth)acrylic polymer
• CPC Class Codes: C09J 7/10 without carriers
• CPC Class Codes: C09J 7/38 Pressure-sensitive adhesives [PSA]
• CPC Class Codes: Y10T 428/14 Layer or component removable to expose adhesive
• CPC Class Codes: Y10T 428/1405 Capsule or particulate matter containing [e.g., sphere, flake, microballoon, etc.]
• CPC Class Codes: Y10T 428/1452 Polymer derived only from ethylenically unsaturated monomer
• CPC Class Codes: Y10T 428/1462 Polymer derived from material having at least one acrylic or alkacrylic group or the nitrile or amide derivative thereof [e.g., acrylamide, acrylate ester, etc.]
• CPC Class Codes: Y10T 428/1481 Dissimilar adhesives
• CPC Class Codes: Y10T 428/1486 Ornamental, decorative, pattern, or indicia
• CPC Class Codes: Y10T 428/24942 including components having same physical characteristic in differing degree
• CPC Class Codes: Y10T 428/28 Web or sheet containing structurally defined element or component and having an adhesive outermost layer

Abstract

This invention is directed to a fiber reinforced adhesive composition comprising a pressure sensitive adhesive matrix and a fibrous reinforcing material within the pressure sensitive adhesive matrix. The adhesive composition has a yield strength and a tensile strength. The tensile strength is at least about 150% of the yield strength. Generally, the adhesive composition exhibits these properties at least 50% elongation when measured according to ASTM D 882-97 at a crosshead speed of 12 inches/minute (30 centimeters/minute).

Claims

1. An adhesive composition comprising

a pressure sensitive adhesive matrix;

and

a fibrous reinforcing material within the pressure sensitive adhesive matrix;

wherein at least 50% of the fibers in the fibrous reinforcing material are continuous for at least 5 centimeters and the adhesive composition has a yield strength and a tensile strength, and wherein the tensile strength is about 0.7 MPa or greater, and at least about 150% of thy yield strength.

2. The adhesive composition of claim 1 wherein the adhesive composition has an elongation a break of at least about 50%.

3. The adhesive composition of claim 1 wherein the adhesive composition has an elongation at break of at least about 300%.

4. The adhesive composition of claim 1 wherein the adhesive composition has a tensile strength of about 0.8 MPa or greater.

5. The adhesive composition of claim 1 wherein the adhesive composition has a yield strength of no less than about 0.1 MPa.

6. The adhesive composition of claim 1 wherein the adhesive composition has a yield strength of no less than about 0.2 MPa.

7. The adhesive composition of claim 1 wherein the pressure sensitive adhesive comprises about 60 to about 95 weight % of the adhesive composition and the reinforcing material comprises about 5 to about 40 weight % of the adhesive composition.

8. The adhesive composition of claim 1 wherein the pressure sensitive adhesive comprises about 70 to about 95 weight % of the adhesive composition and the reinforcing material comprises about 5 to about 30 weight % of the adhesive composition.

9. The adhesive composition of claim 1 wherein a ratio of the reinforcing material melt viscosity to the pressure sensitive adhesive melt viscosity is about 0.5 to about 1.2.

10. The adhesive composition a claim 1 wherein the fibrous reinforcing material comprises at least one fiber having a diameter of less than about 5 micrometers.

11. The adhesive composition of claim 1 wherein the fibrous reinforcing material comprises at least one fiber having an aspect ratio of greater than about 1000.

12. The adhesive composition of claim 1 wherein the pressure sensitive adhesive comprises a pressure sensitive adhesive based on at least one of a natural rubber, synthetic rubber, styrene block copolymer, polyvinyl ether, poly(meth)acrylate, polyolefin, silicone or combinations thereof.

13. The adhesive composition of claim 1 wherein the pressure sensitive adhesive comprises a polymer derived from at least one alkyl (meth)acrylate ester monomer selected from isooctyl acrylate, 2-ethyl-hexyl acrylate, and n-butyl acrylate;

and at least one co-monomer selected from acrylic acid and acrylamide.

14. The adhesive composition of claim 1 wherein the reinforcing material comprises an elastomer having a yield strength no greater than about 20 MPa and a tensile strength of at least about 150% of the yield strength.

15. The adhesive composition of claim 1 wherein the reinforcing material comprises a semi crystalline polymer.

16. The adhesive composition of claim 1 wherein the reinforcing material has a melting point greater than about 70°

C.

17. A substrate at least partially coated with the adhesive composition of claim 1.

18. The substrate of claim 17 wherein the substrate comprises a release liner.

19. A tape comprising

a backing having a first and second side; and

the adhesive composition of claim 1 coated on at least a portion of the first side of the backing.

20. A tape comprising

a backing having a first and second side;

and

the adhesive composition of claim 1 coated on at least a portion of the first side of the backing and, optionally, on at least a portion of the second side of the backing.

21. A stretch removable article comprising the adhesive composition of claim 1.

22. The adhesive composition of claim 1 wherein the adhesive composition is stretch removable from a substrate.

23. An adhesive composition comprising

a pressure sensitive adhesive matrix;

and

a fibrous reinforcing material, having a melting temperature of no less than about 70°

C., within the pressure sensitive adhesive matrix;

wherein the adhesive composition has a yield strength and a tensile strength, and the tensile strength is at least about 150% of the yield strength.

24. An adhesive composition comprising

a pressure sensitive adhesive matrix;

and

a uniformly dispersed substantially continuous fiber within the pressure sensitive adhesive matrix wherein the fiber is continuous for at least 5 centimeters.

25. An adhesive composition comprising

a pressure sensitive adhesive matrix;

and

a fibrous reinforcing material within the pressure sensitive adhesive matrix;

wherein at least 50% of the fibers in the fibrous reinforcing material are continuous for at least 5 centimeters and the adhesive composition flows less than 13 micrometers after 24 hours in an Accelerated Adhesive Flow Test.

26. The adhesive composition of claim 25 wherein the pressure sensitive adhesive matrix has an intrinsic viscosity of at least about 0.45 dl/g.

27. An adhesive composition comprising

a pressure sensitive adhesive matrix;

and

a fibrous reinforcing material within the pressure sensitive adhesive matrix;

wherein at least 50% of the fibers in the fibrous reinforcing material are continuous for at least 5 centimeters and the adhesive composition has a creep compliance of less than 7×

10<sup>−

4</sup> Pa<sup>−

1</sup> and a viscosity greater than 1×

10⁶ Pa·

s.