Acrylic polyvinyl acetal films comprising a second layer

Patent metadata

Field	Value
Publication number	US-11034830-B2
Application number	US-201615777686-A
Country	US
Kind code	B2
Filing date	Dec 13, 2016
Priority date	Dec 22, 2015
Publication date	Jun 15, 2021
Grant date	Jun 15, 2021

Abstract

A film is described comprising a first film layer having a Tg ranging from 30° C. to 60° C. The first film layer comprises a (meth)acrylic polymer and polyvinyl acetal polymer composition. The film further comprises a second layer proximate the first film layer. The second layer is different than the first film layer. The second may be a cured (meth)acrylic polymer film or coating; a backing such as thermoplastic polymer, woven or nonwoven fabrics, metal foils, paper, foams; or a coverfilm such as a fluoropolymer.

First claim

What is claimed is:

1. A film comprising:
a first film layer comprising a (meth)acrylic polymer and 5 wt. % to 30 wt. % of polyvinyl acetal polymer comprising polymerized units having the following formula

wherein R 1 is hydrogen or a C1-C7 alkyl group;
wherein the first film layer comprises 10 to 65 wt-% of polymerized units of polar monomer such that the (meth)acrylic polymer and polyvinyl acetal polymer have a single Tg ranging from 30° C. to 60° C. as measured by Differential Scanning calorimetry; and
a second film layer proximate the first film layer with the proviso that the second layer does not comprise a (meth)acrylic polymer and a polyvinyl acetal resin composition having a Tg less than 30° C.

2. The film of claim 1 wherein the second film layer is not thermoplastic.

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

4. The film of claim 1 wherein the second film layer comprises a cured (meth)acrylic polymer and optionally a polyvinyl acetal polymer.

5. The film of claim 4 wherein the cured (meth)acrylic polymer of the second film layer comprises greater than 10 wt-% polymerized units of a multifunctional (meth)acrylate monomer or oligomer.

6. The film of claim 4 wherein the cured (meth)acrylic polymer of the second film layer comprises at least one monomer, oligomer, or polymer comprising a free radically polymerizable silicone group or a free radically polymerizable fluorine group.

7. The film of claim 1 wherein the second film layer has a Tg no greater than 60° C.

8. The film of claim 1 wherein the second film layer has a Tg greater than 60° C.

9. The film of claim 1 wherein the first film layer and/or second film layer comprises a pigment, colorant, decorative additive, or a combination thereof.

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

11. The film of claim 1 wherein the first film layer and/or second film layer comprises 10 to 85 wt-% of polymerized units of monofunctional alkyl (meth)acrylate monomer having a Tg of less than 0° C.

12. The film of claim 11 wherein the monofunctional alkyl (meth)acrylate monomer has a Tg of less than −40° C.

13. The film of claim 1 wherein the second film layer comprises polyvinyl butyral polymer.

14. The film of claim 1 wherein the first film layer comprises photoinitiator.

15. The film of claim 1 wherein the film or second film layer further comprises a backing selected from polymeric films, woven or nonwoven fabrics, metal foils, paper, foams, and combinations thereof.

16. The film of claim 15 wherein the backing comprises a thermoplastic polymer that is selected from polycarbonate, polyethylene terephthalate, polyamide, polyethylene, polypropylene, polystyrene polyvinyl chloride, poly(meth)acrylic polymer, and ABS (acrylonitrile-butadiene-styrene copolymer).

17. The film of claim 1 wherein the first film layer further comprises a metal or metal oxide layer.

18. The film of claim 1 further comprising a cover film or the second film layer is a cover film and the cover film is selected from fluoropolymer, polycarbonate, polyethylene terephthalate, polyamide, polyethylene, polypropylene, polystyrene polyvinyl chloride, poly(meth)acrylic polymer, and ABS (acrylonitrile-butadiene-styrene copolymer).

19. The film of claim 1 wherein the film comprises no greater than 25 wt-% of inorganic oxide materials.

20. The film of claim 1 wherein the (meth)acrylic polymer of the first film layer is a random polymer.

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
• Hebrink Timothy J
• Hulke Amanda K
• Shockey Eric D
• Renstrom Anthony M
• Mackey Sonja S
• Klun Thomas P

Classifications

• B32B7/027

  Thermal properties · CPC title

• B32B2307/416

  Reflective · CPC title

• B32B2307/41

  Opaque · CPC title

• B32B27/308

  comprising acrylic (co)polymers · CPC title

• B32B15/082

  comprising vinyl resins; comprising acrylic resins · CPC title