Reaction setting, polymer, sealing material for liquid crystal displays
First Claim
1. In a liquid crystal display element comprising upper and lower substrates both made of flexible polymeric film, a layer of liquid crystal material disposed between said substrates and sealing material surrounding said layer of liquid crystal material and sealing the space between said substrates to form a closed cell, the improvement which comprises:
- said sealing material is free of solvents and comprises a reaction-setting type polymer containing siloxane bonds, and shows a characteristic infra-red absorption at least in the range of 1,000 cm-1 to 1,100 cm-1.
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Abstract
A sealing material particularly suitable for producing liquid crystal display panels of which the base plates are made of flexible polymer film, which sealing material comprises a reaction-setting type polymer containing siloxane bonds in the molecules, which polymer is represented by the following general formula ##STR1## wherein R represents a lower alkyl group, and X1, X2, X3, X4, X5, X6 and X7 independently represent radicals selected from the group consisting of hydroxy, acetoxy, alkoxy, hydrogen, vinyl, epoxy, amino, glycol, phenyl, fluorinated alkyl and lower alkyl, and at least one of X1 through X7 is a radical selected from the group consisting of hydroxy, acetoxy, alkoxy, hydrogen, vinyl, epoxy, amino and glycol, and n represents an integer of 5 to 10000. Since sealing material has high sealing strength for the polymer film over a long period of time and is free from solvents, the liquid crystal, the orientation processed films, the transparent electrodes and the base plates of the liquid display panels are not caused to deteriorate by this sealing material.
35 Citations
11 Claims
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1. In a liquid crystal display element comprising upper and lower substrates both made of flexible polymeric film, a layer of liquid crystal material disposed between said substrates and sealing material surrounding said layer of liquid crystal material and sealing the space between said substrates to form a closed cell, the improvement which comprises:
- said sealing material is free of solvents and comprises a reaction-setting type polymer containing siloxane bonds, and shows a characteristic infra-red absorption at least in the range of 1,000 cm-1 to 1,100 cm-1.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A liquid crystal display element comprising:
- a twisted-nematic liquid crystal layer;
upper and lower transparent substrates disposed on opposite sides of said liquid crystal layer, said substrates both being made of flexible polymeric film, selected from the group consisting of polyethylene terephthalate films, polybutylene terephthalate films, polyether sulfone films, polycarbonate films and polysulfone films;
upper and lower transparent electrodes supported on the opposed inner faces of said upper and lower substrates respectively, said electrodes being effective to apply an electric field to said liquid crystal layer;
upper and lower polarizers mounted on the outer faces of said upper and lower substrates; and
a layer of sealing material disposed between said substrates surrounding said liquid crystal layer, said sealing material consisting essentially of a solvent-free, reaction-setting polysiloxane. - View Dependent Claims (10, 11)
- a twisted-nematic liquid crystal layer;
Specification