Heat de-bondable optical articles

Patent metadata

Field	Value
Publication number	US-9827739-B2
Application number	US-201314416852-A
Country	US
Kind code	B2
Filing date	Jul 1, 2013
Priority date	Jul 26, 2012
Publication date	Nov 28, 2017
Grant date	Nov 28, 2017

Abstract

Heat de-bondable optical articles include two optical substrates and a heat de-bondable adhesive article disposed between them. The adhesive article includes a heat-shrinkable substrate and an optically clear adhesive proximate to the heat-shrinkable substrate. Optical articles can be prepared by disposing the heat-shrinkable substrate and the optically clear adhesive between two optical substrates. The optically clear adhesive covers a majority of the surface area of the optical substrates, and the heat-shrinkable substrate is located near the edge of the optical substrates.

First claim

What is claimed is:

1. An article comprising:
a first optical substrate with a first major surface, a second major surface, and
at least one edge;
a second optical substrate with a first major surface and a second major surface and at least one edge; and
an adhesive article disposed between the first optical substrate and the second optical substrate, the adhesive article comprising:
a first optically clear adhesive with a first major surface and a second major surface, wherein the first major surface of the first optically clear adhesive is disposed on the second major surface of the first optical substrate such that the first optically clear adhesive is disposed on a majority of the surface area of the second major surface of the first optical substrate, and is disposed on the first major surface of the second optical substrate such that the first optically clear adhesive is disposed on a majority of the surface area of the first major surface of the second optical substrate; and
a heat-shrinkable substrate with a first major surface and a second major surface, wherein the heat-shrinkable substrate is proximate to the first optically clear adhesive and also is proximate to the edge of the second major surface of the first optical substrate and wherein the second major surface of the heat-shrinkable substrate is proximate to the edge of the first major surface of the second optical substrate, such that the heat-shrinkable substrate is not disposed on a majority of the surface area of either the first optically clear substrate or the second optical substrate, and wherein at least part of the heat-shrinkable substrate has a threshold shrink force of at least 100 grams per inch (3.85 N/dm), and the first optically clear adhesive has a Failure Force of from 0.1 to 85 grams per inch (0.039-3.3 N/dm), where the Failure Force is determined by measuring either the 90° Peel Adhesion at room temperature or the 180° Peel Adhesion at 100° C. to a glass substrate of an article comprising the first optically clear adhesive and the heat-shrinkable substrate.

2. The article of claim 1 , further comprising a second adhesive disposed between the first major surface of the heat-shrinkable substrate and the second major surface of the first optical substrate and a third adhesive disposed between the second major surface of the heat-shrinkable substrate and the first major surface of the second optical substrate, wherein the second and third adhesive each has a Failure Force of from 0.1 to 85 grams per inch (0.039-3.3 N/dm), where the Failure Force is determined by measuring either the 90° Peel Adhesion at room temperature or the 180° Peel Adhesion at 100° C. to a glass substrate of an article comprising the second or third adhesive and the heat-shrinkable substrate.

3. The article of claim 1 , wherein the first optical substrate comprises a rigid or semi-rigid substrate and the second optical substrate comprises a rigid, semi-rigid, or flexible substrate.

4. The article of claim 3 , wherein the first optical substrate comprises a semi-rigid substrate with a thickness of from 25-100 micrometers.

5. The article of claim 1 , wherein the first optically clear adhesive comprises a pressure sensitive adhesive.

6. The article of claim 1 , wherein the first optically clear adhesive comprises a gel, or a cured adhesive.

7. The article of claim 1 , wherein the heat-shrinkable substrate comprises a film comprising a polyolefin film, a poly(meth)acrylate film, a polyester film, a polystyrene film, a polycarbonate film, a vinyl film, a cellulose-based film, or a blend film.

8. The article of claim 1 , wherein the first and second optical substrates each comprise a second edge, and the adhesive article further comprises a second heat-shrinkable substrate with a first major surface and a second major surface proximate to the first optically clear adhesive, wherein the first major surface of the second heat-shrinkable substrate is proximate to the second edge of the second major surface of the first optical substrate and wherein the second major surface of the heat-shrinkable substrate is proximate to the second edge of the first major surface of the second optical substrate.

9. The article of claim 1 , wherein the first and second optical substrates each comprise multiple edges, and wherein the adhesive article further comprises multiple heat-shrinkable substrates proximate to the first optically clear adhesive and wherein each heat-shrinkable substrate is proximate to an edge of the first and second optical substrate.

10. The article of claim 9 , wherein the multiple heat-shrinkable substrates are proximate to the entire perimeter of the optical substrates.

11. A method comprising:
preparing a multi-layer article, wherein preparing the multi-layer article comprises:
providing a first optical substrate having a first major surface and a second major surface and at least one edge;
providing a second optical substrate having a first major surface and a second major surface and at least one edge;
forming an adhesive article on the second major surface of the first optically clear substrate, wherein forming the adhesive article comprises:
disposing a heat-shrinkable substrate on the second major surface of the first optical substrate, proximate to the edge of the first optically clear substrate, wherein the heat-shrinkable substrate has a first major surface and a second major surface and threshold shrink force of at least 100 grams per inch (3.85 N/dm); and
disposing a first optically clear adhesive on the majority of the surface area of the second major surface of the first optical substrate and proximate to the heat-shrinkable substrate, such that the first optically clear adhesive forms an adhesive bond to the first optical substrate, and wherein the first optically clear adhesive has a Failure Force of from 0.1 to 85 grams per inch (0.039-3.3 N/dm), where the Failure Force is determined by measuring either the 90° Peel Adhesion at room temperature or the 180° Peel Adhesion at 100° C. to a glass substrate of an article comprising the second or third adhesive and the heat-shrinkable substrate; and

disposing the second optical substrate on the adhesive article such that the edge of the second major substrate is proximate to the second major surface of the heat-shrinkable substrate, and the first optically clear adhesive is disposed on the majority of the surface area of the first major surface of the second optical substrate, such that the first optically clear adhesive forms an adhesive bond to the second optical substrate.

12. The method of claim 11 , wherein the heat-shrinkable substrate further comprises a second adhesive disposed on the first major surface of the heat-shrinkable substrate and a third adhesive layer disposed on the second major surface of the heat-shrinkable substrate.

13. The method of claim 11 , wherein the first optical substrate comprises a rigid or semi-rigid substrate and the second optical substrate comprises a rigid, semi-rigid, or flexible substrate.

14. The method of claim 11 , wherein the first optically clear adhesive comprises a pressure sensitive adhesive.

15. The method of claim 11 , wherein the first optically clear adhesive comprises a gel, or a cured adhesive.

16. The method of claim 11 , wherein the heat-shrinkable substrate comprises a film comprising a polyolefin film, a poly(meth)acrylate film, a polyester film, a polystyrene film, a polycarbonate film, a vinyl film, a cellulose-based film, or a blend film.

17. The method of claim 11 , wherein the first and second opti

Assignees

• 3M Innovative Properties Co

Inventors

• Rule Joseph D
• Tapio Scott M
• Sherman Audrey S
• Schaffer Kevin R
• Liu Lan H
• Branigan Margot A
• Behling Ross E

Classifications

• B32B7/06 Primary

  permitting easy separation · CPC title

• C09J5/06

  involving heating of the applied adhesive · CPC title

• G02B5/00 Primary

  Optical elements other than lenses (light guides G02B6/00; optical logic elements G02F3/00) · CPC title

• B32B37/18

  involving the assembly of discrete sheets or panels only · CPC title

• B32B38/0036

  Heat treatment (for heating or cooling of layers during lamination B32B37/06, B32B37/08) · CPC title