Acrylic polyvinyl acetal films comprising an adhesive layer

Patent metadata

Field	Value
Publication number	US-10344188-B2
Application number	US-201615777947-A
Country	US
Kind code	B2
Filing date	Dec 16, 2016
Priority date	Dec 22, 2015
Publication date	Jul 9, 2019
Grant date	Jul 9, 2019

Abstract

A film is described comprising a (meth)acrylic polymer and polyvinyl acetal polymer composition. A layer of an adhesive composition is disposed proximate the film. The adhesive composition has a tensile elastic modulus of less than 1 MPa at 25° C. and 1 hertz.

First claim

What is claimed is:

1. A film comprising a (meth)acrylic polymer and polyvinyl acetal polymer composition comprising polymerized units having the following formula

wherein R 1 is hydrogen or a C1-C7 alkyl group; and
wherein a layer of an adhesive composition is disposed proximate the film and the adhesive composition has a tensile elastic modulus of less than 1 MPa at 25° C. and 1 hertz.

2. The film of claim 1 wherein the adhesive composition has a Tg of less than 25° C.

3. The film of claim 1 wherein the adhesive composition is a pressure sensitive adhesive having a tensile elastic modulus of less than 0.9 MPa at 25° C. and 1 hertz.

4. The film of claim 1 wherein the film is a backing of an adhesive coated sheet or tape.

5. The film of claim 1 wherein the film further comprises a second backing proximate the base film.

6. The film of claim 5 wherein the second backing comprises a substrate selected from polymeric films, woven or nonwoven fabrics, metal foils, foams, paper, and combinations thereof.

7. The film of claim 1 wherein the film and/or second backing is a conformable polymeric film.

8. The film of claim 1 wherein the adhesive composition is an acrylic adhesive composition.

9. The film of claim 1 wherein the layer of adhesive is structured.

10. The film of claim 1 wherein the film comprises a structured layer.

11. The film of claim 1 further comprising a release coating disposed on an outer exposed surface of the film.

12. The film of claim 1 further comprising a removable release liner covering the layer of adhesive.

13. The film of claim 1 wherein the film has a Tg of at least 30° C.

14. The film of claim 1 wherein the film has a gel content of at least 20%.

15. The film of claim 1 wherein the film has a tensile elastic modulus of at least 1 MPa at 25° C. and 1 hertz.

16. The film of claim 1 wherein the film comprises at least 10 wt.-% of polymerized units of monofunctional alkyl (meth)acrylate monomer having a Tg of less than 0° C.

17. The film of claim 16 wherein the film comprises polymerized units of monofunctional alkyl (meth)acrylate monomer having a Tg of less than −40° C.

18. The film of claim 1 wherein the film comprises at least 10 wt.-% and no greater than 65 wt.-% of polymerized units of polar monomers selected from acid-functional, hydroxyl functional monomers, nitrogen-containing monomers, and combinations thereof.

19. The film of claim 1 wherein the film further comprises polymerized units of a multifunctional crosslinker wherein the crosslinker comprises functional groups selected from (meth)acrylate, alkenyl, and hydroxyl-reactive groups.

20. The film of claim 1 wherein the (meth)acrylic polymer and polyvinyl acetal polymer composition of the film has a single phase.

21. The film of claim 2 wherein the adhesive composition has a Tg of less than 0° C.

Assignees

• 3M Innovative Properties Co

Inventors

• Janoski Jonathan E
• Thomas Carla S
• Schultz Anthony F
• Whiting Tien Y H
• Lewandowski Kevin M
• Fansler Duane D
• Lyon Keith R
• Weikel Arlin L
• Shockey Eric D
• Gustafson Donald E
• Frank John W

Classifications

• B32B2262/062

  Cellulose fibres, e.g. cotton · CPC title

• B32B2307/41

  Opaque · CPC title

• B32B27/365

  comprising polycarbonates · CPC title

• B32B2262/101

  Glass fibres · CPC title

• B32B2451/00

  Decorative or ornamental articles · CPC title