Article comprising polyacrylate pressure sensitive primer and adhesive comprising polyacrylate component

Patent metadata

Field	Value
Publication number	US-9850405-B2
Application number	US-201415022217-A
Country	US
Kind code	B2
Filing date	Sep 30, 2014
Priority date	Oct 2, 2013
Publication date	Dec 26, 2017
Grant date	Dec 26, 2017

Abstract

An article is described comprising a substrate, a pressure sensitive polyacrylate primer layer disposed on the substrate, and an adhesive layer disposed onto the primer layer; wherein the adhesive layer comprises a polyacrylate component. The adhesive layer is typically further bonded to a second substrate or a release liner. In some embodiments, at least one substrate further comprises a microstructured surface layer and the primer layer is bonded to the microstructured surface layer. In other embodiments, the adhesive layer is further bonded to a (e.g. post) structure. In some embodiments, the articles are optical films or optical film stacks. Methods of making an (e.g. adhesive coated) article are also described.

First claim

What is claimed is:

1. An article comprising a substrate, a pressure sensitive polyacrylate primer layer disposed on the substrate wherein the pressure sensitive polyacrylate primer layer consists essentially of at least 80% polyacrylate and a nitrogen containing polymer, and an adhesive layer disposed onto the primer layer; wherein the adhesive layer comprises a polyacrylate component.

2. The article of claim 1 wherein the adhesive layer is further bonded to a second substrate or a release liner.

3. The article of claim 1 wherein at least one substrate further comprises a microstructured surface layer and the primer layer is bonded to the microstructured surface layer.

4. The article of claim 3 wherein the microstructured surface layer comprises a plurality of peaks and the peaks are free of matte particles.

5. The article of claim 1 wherein the substrate is an optical substrate.

6. The article of claim 1 wherein the adhesive layer comprises a cured adhesive layer comprising an interpenetrating network of the reaction product of the polyacrylate and a polymerizable monomer.

7. The article of claim 6 wherein the cured adhesive layer has an elastic modulus ranging from 100 to 2000 MPa at 25 C.

8. The article of claim 6 wherein the polymerizable monomer of the adhesive layer comprises a monomer comprising functional groups and a molecular weight less than 150 g/mole per functional group.

9. The article of claim 8 wherein the polymerizable monomer of the cured adhesive layer is a cationically polymerizable epoxy resin or a free-radically polymerizable monomer.

10. The article of claim 6 wherein the cured adhesive layer comprises about 35 wt-% to about 75 wt-% of the polyacrylate.

11. The article of claim 6 wherein the cured adhesive layer is free of a nitrogen-containing monomer or polymer.

12. The article of claim 1 wherein the primer layer comprises at least 85 wt-% of the polyacrylate.

13. The article claim 1 wherein the polyacrylate of the adhesive is a pressure sensitive adhesive.

14. The article of claim 1 wherein the polyacrylate of the primer, adhesive, or combination thereof comprises at least 40 wt-% of monomeric repeat units comprising branched C4-C12 alkyl groups.

15. The article of claim 1 wherein the nitrogen-containing polymer of the pressure sensitive polyacrylate primer layer comprises at least one nitrogen atom comprising a free pair of electrons.

16. The article of claim 15 wherein the primer layer comprises up to 5 wt-% of one or more nitrogen-containing polymers.

17. The article of claim 16 wherein the nitrogen-containing polymer is a homopolymer or copolymer of vinylcaprolactam, vinylpyrollidone, or a combination thereof.

18. An film stack comprising a first film comprising
a pressure sensitive polyacrylate primer layer disposed on the first optical film wherein
the pressure sensitive polyacrylate primer layer consists essentially of at least 80% polyacrylate and a nitrogen containing polymer, and
an adhesive layer disposed onto the primer layer; wherein the adhesive layer comprises a polyacrylate component; and

a second film bonded to the adhesive layer.

19. The film stack of claim 18 wherein the first film comprises a plurality of structures on a first surface bonded to a second film such that a portion of the structures penetrate a major surface of the adhesive layer and a separation is provided between the major surface of the adhesive layer and the first surface.

20. The film stack of claim 19 wherein less than 50% of the total surface area of the major surface of the adhesive layer is in contact with the structures.

Assignees

• 3M Innovative Properties Co

Inventors

• Edmonds William F
• Petaja Jason S
• Solomon Jeffrey L

Classifications

• C09J2433/003

  in the primer coating · CPC title

• C09J2463/00

  Presence of epoxy resin · CPC title

• C09J7/381 Primary

  based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds · CPC title

• C09J7/29

  Laminated material (metallised plastics C09J7/22) · CPC title

• B32B7/12

  using interposed adhesives or interposed materials with bonding properties · CPC title