Photo-elastic compensation of thin glass sheets

Patent metadata

Field	Value
Publication number	US-10399893-B2
Application number	US-201515533717-A
Country	US
Kind code	B2
Filing date	Dec 8, 2015
Priority date	Dec 18, 2014
Publication date	Sep 3, 2019
Grant date	Sep 3, 2019

Abstract

A coated glass substrate. The coated glass substrate comprises a glass sheet having a thickness from 0.1 to 0.7 mm and coated on a first side with a first optical layer having a positive photo-elastic constant and coated on a second side with a second optical layer having a negative photo-elastic constant.

First claim

The invention claimed is:

1. A coated glass substrate; said coated glass substrate comprising a glass sheet having a thickness from 0.1 to 0.7 mm and coated on a first side with a first optical layer having a positive photo-elastic constant from 5 to 250×10 −12 Pa −1 and coated on a second side with a second optical layer having a negative photo-elastic constant from −5 to −250×10 −12 Pa −1 , wherein the difference between the absolute values of the photo-elastic constants is no greater than 250×10 −12 Pa −1 .

2. The coated glass substrate of claim 1 in which each of the first optical layer and the second optical layer has a thickness from 1 to 100 microns.

3. The coated glass substrate of claim 2 , wherein the first optical layer is selected from the group consisting of poly(benzyl methacrylate), poly(vinyl naphthalene), polycarbonate, polyester, polystyrene, styrene copolymer, styrene acrylonitrile, styrene maleic anhydride, maleimide-styrene copolymer, cyclic olefin copolymer, cyclic olefin polymer and cellulosic polymers.

4. The coated glass substrate of claim 3 , wherein the second optical layer is selected from the group consisting of fully hydrogenated vinyl aromatic polymers and copolymers, cyclic block copolymer, polymethylmethacrylate, poly(α-methyl styrene), poly(tri-fluoroethyl methacrylate) and poly(tri-chloroethyl methacrylate).

5. The coated glass substrate of claim 4 in which the thickness of the glass sheet is from 0.2 to 0.5 mm.

6. A liquid crystal cell comprising at least one coated glass substrate of claim 1 .

Assignees

• Rohm & Haas
• Rohm & Haas Elect Mat
• Dow Global Technologies Llc

Inventors

• Chang Shih-Wei
• Li Lanfang
• O'Connell Kathleen M
• Zhou Weijun

Classifications

• C03C17/28

  with organic material (C03C17/34, C03C17/44 take precedence) · CPC title

• C03C17/002 Primary

  for flat glass, e.g. float glass · CPC title

• C03C17/32

  with synthetic or natural resins (C03C17/30 takes precedence) · CPC title

• C03C17/324 Primary

  Polyesters · CPC title

• C03C17/328

  Polyolefins · CPC title