Method of making optical body having polyacrylate skin layer

Patent metadata

Field	Value
Publication number	US-9851481-B2
Application number	US-78033010-A
Country	US
Kind code	B2
Filing date	May 14, 2010
Priority date	Jun 3, 2005
Publication date	Dec 26, 2017
Grant date	Dec 26, 2017

Abstract

A method of making an optical body an optical body is disclosed. The method includes coextruding a first skin layer and a first strippable skin layer on a first side of an optical layer. The first skin layer is disposed between the optical layer and the first strippable skin layer. The first skin layer includes a mixture of a polyacrylate and a second polymer which may or may not be miscible in the polyacrylate. The second polymer may be an anti-static polymer.

First claim

What is claimed is:

1. A method of making an optical body, comprising:
coextruding a first skin layer comprising a dimensionally stable blend skin layer consisting essentially of a mixture of a polyacrylate and a second polymer, wherein the second polymer consists of an antistatic polymer, a functionalized copolymer, or an elastomer, and is present in a range from 1 to 40 weight percent, and a first strippable skin layer on a first side of an optical layer comprising polyester, such that the first skin layer is disposed between the optical layer and the first strippable skin layer, and such that the first strippable layer is applied to the first skin layer.

2. The method of claim 1 , wherein coextruding the first skin layer and the first strippable skin layer further comprises:
coextruding a second skin layer comprising polyacrylate, and a second strippable skin layer on a second side of the optical layer, wherein the second skin layer is disposed between the optical layer and the second strippable skin layer, and the second side of the optical layer is opposite the first.

3. The method of claim 1 , further comprising biaxially orienting the optical layer.

4. The method of claim 1 , further comprising substantially uniaxially orienting the optical layer.

5. The method of claim 1 , wherein the second polymer is not miscible in the polyacrylate and has a refractive index of from 1.45 to 1.53.

6. The method of claim 1 , wherein the second polymer is miscible in the polyacrylate.

7. The method of claim 1 , wherein the second polymer is an anti-static polymer.

8. The method of claim 1 , wherein the second polymer comprises polyvinylidene fluoride.

9. The method of claim 1 , wherein the optical layer comprises polyethylene terephthalate or copolyethylene terephthalate, and coextruding the first skin layer and the first strippable skin layer further comprises coextruding the optical layer.

10. The method of claim 9 , wherein the first skin layer consists of a mixture of a copolymer of polymethylmethacrylate and an anti-static polymer, and the first strippable skin layer comprises polypropylene.

11. The method of claim 1 , wherein the optical layer comprises polyethylene naphthalate or copolyethylene terephthalate, and coextruding the first skin layer and the first strippable skin layer further comprises coextruding the optical layer.

12. The method of claim 11 , wherein the first skin layer consists of a mixture of polymethylmethacrylate and an anti-static polymer, and the first strippable skin layer comprises polypropylene.

13. The method of claim 1 , wherein the first extruded strippable skin layer comprises a rough strippable skin layer comprising a continuous phase and a disperse phase.

14. The method of claim 1 , further comprising removing the first strippable skin layer from the first skin layer.

15. The method of claim 1 , wherein the first extruded skin layer further consists of a UV absorber.

16. The method of claim 1 , wherein the first extruded skin layer further consists of a UV absorber and a hindered amine light stabilizer.

17. A method of making an optical body, comprising:
coextruding a plurality of polymer layers including a first group of polymer layers and a first skin layer, the first group of polymer layers forming a multilayer optical stack that includes an optical layer comprising polyester, and the first skin layer consisting essentially of a mixture of a polyacrylate and a second polymer, wherein the second polymer comprises an antistatic polymer, a functionalized copolymer, or an elastomer, and is present in a range from 1 to 40 weight percent; and applying a first strippable skin layer to the first skin layer such that the first skin layer is disposed between the optical layer and the first strippable skin layer.

18. The method of claim 17 , wherein the applying comprises coating the first strippable skin layer onto the first skin layer.

19. The method of claim 17 , wherein the applying comprises extruding the first strippable skin layer onto the first skin layer.

Assignees

• Hebrink Timothy J
• Johnson Stephen A
• Derks Kristopher J
• Hamer Kevin M
• 3M Innovative Properties Co

Inventors

• Hebrink Timothy J
• Johnson Stephen A
• Derks Kristopher J
• Hamer Kevin M

Classifications

• Y10T428/24355

  Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.] · CPC title

• Y10T428/31909

  Next to second addition polymer from unsaturated monomers · CPC title

• B29D11/0073

  Optical laminates · CPC title

• Y10T428/1476

  Release layer · CPC title

• Y10T428/14

  Layer or component removable to expose adhesive · CPC title