Pressure-Sensitive Adhesive and Liquid Crystal Cell

Patent metadata

Field	Value
Publication number	US-2023279279-A1
Application number	US-202118008230-A
Country	US
Kind code	A1
Filing date	Jul 2, 2021
Priority date	Jul 2, 2020
Publication date	Sep 7, 2023
Grant date	—

Abstract

A pressure-sensitive adhesive and a liquid crystal cell including the same are disclosed herein. In some embodiments, a pressure-sensitive adhesive having a storage elastic modulus of 700 kPa or more at a temperature of 25° C. and a frequency of 6 rad/sec, and a gel fraction of 35% or more, wherein the gel fraction is defined by Equation 1:B/A×100  [Equation 1]wherein, A is an initial mass (g) of the pressure-sensitive adhesive, B is a mass (g) of an insoluble content after the pressure-sensitive adhesive is immersed in a solvent at 60° C. for 24 hours and then dried at 150° C. for 30 minutes. The press-sensitive adhesive is advantageous for implementation into a flexible element between upper and lower substrates of a liquid crystal cell, and providing excellent electro-optical properties and appearance uniformity by minimizing defects.

First claim

1 . A pressure-sensitive adhesive having a storage elastic modulus of 700 kPa or more at a temperature of 25° C. and a frequency of 6 rad/sec, and a gel fraction of 35% or more, wherein the gel fraction is defined by Equation 1:
B/A× 100  [Equation 1]

wherein, A is an initial mass (g) of the pressure-sensitive adhesive, B is a mass (g) of an insoluble content after the pressure-sensitive adhesive is immersed in a solvent at 60° C. for 24 hours and then dried at 150° C. for 30 minutes.

2 . The pressure-sensitive adhesive according to claim 1 , wherein the storage elastic modulus is in a range of 700 kPa to 2000 kPa.

3 . The pressure-sensitive adhesive according to claim 1 , wherein the gel fraction is in a range of 35% to 50%.

4 . The pressure-sensitive adhesive according to claim 1 , wherein the pressure-sensitive adhesive is a silicone-based pressure-sensitive adhesive.

5 . The pressure-sensitive adhesive according to claim 1 , wherein the pressure-sensitive adhesive is a liquid crystal orientational pressure-sensitive adhesive.

6 . A liquid crystal cell comprising:
an upper substrate including an upper base film and a layer of the pressure-sensitive adhesive of claim 1 formed on one side of the upper base film, a lower substrate including a lower base film and a spacer formed on one side of the lower base film, and a liquid crystal layer between the upper substrate and the lower substrate.

7 . The liquid crystal cell according to claim 6 , wherein the upper base film and the lower base film are each a polymer film.

8 . The liquid crystal cell according to claim 6 , wherein the layer of pressure-sensitive adhesive of the upper substrate and the spacer of the lower substrate are present in are attached.

9 . The liquid crystal cell according to claim 6 , wherein the lower substrate further comprises a lower alignment film formed on the spacer.

10 . The liquid crystal cell according to claim 6 , wherein the upper substrate further comprises an upper electrode layer formed on the upper base film, and the lower substrate further comprises a lower electrode layer formed on the lower base film.

11 . The liquid crystal cell according to claim 6 , wherein the spacer comprises a curable resin.

12 . The liquid crystal cell according to claim 6 , wherein the spacer a partition wall spacer.

13 . The liquid crystal cell according to claim 6 , wherein the spacer has a line width in a range of 5 μm to 50 μm, and the spacer has a height in a range of 3 μm to 20 μm.

14 . The liquid crystal cell according to claim 6 , wherein the upper substrate and the lower substrate are spaced apart by the spacer, and the liquid crystal layer is present in a region where the spacer does not exist between the upper substrate and the lower substrate.

15 . A sunroof comprising the liquid crystal cell of claim 6 .

Assignees

• Lg Chemical Ltd

Inventors

• You Jung Sun
• Oh Dong Hyun
• Kim Jin Hong
• Kim Jung Woon
• Gim Min Jun

Classifications

• C09J183/04 Primary

  Polysiloxanes · CPC title

• C08G77/04

  Polysiloxanes · CPC title

• G02F1/13394

  spacers regularly patterned on the cell subtrate, e.g. walls, pillars (G02F1/133377 takes precedence) · CPC title

• G02F1/13398

  Spacer materials; Spacer properties · CPC title

• G02F2202/28

  Adhesive materials or arrangements · CPC title