Method of preparing thin liquid crystal films
First Claim
Patent Images
1. A method of producing a thin electrically addressable light modulating liquid crystalline film comprising the steps of:
- a) preparing a solution comprising a polymerizable monomeric material in a mesogenic solvent having positive dielectric anisotropy;
b) polymerizing said solution in bulk until said monomeric material polymerizes and phase separates from the mesogenic solvent to form a spreadable liquid crystalline paste; and
thereafter,c) coating said liquid crystal paste onto a substrate to form a thin electrically addressable film.
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Abstract
A liquid crystalline paste material is formed by polymerization of a solution containing a mesogenic solvent and monomeric material in bulk. The paste provides an improved method of preparing thin electrically addressable light modulating films by coating the paste onto a suitable substrate.
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Citations
19 Claims
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1. A method of producing a thin electrically addressable light modulating liquid crystalline film comprising the steps of:
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a) preparing a solution comprising a polymerizable monomeric material in a mesogenic solvent having positive dielectric anisotropy; b) polymerizing said solution in bulk until said monomeric material polymerizes and phase separates from the mesogenic solvent to form a spreadable liquid crystalline paste; and
thereafter,c) coating said liquid crystal paste onto a substrate to form a thin electrically addressable film. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of producing a thin electrically addressable light modulating liquid crystalline film comprising the steps of:
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a) polymerizing a monomeric material to form a light transmissive polymer; b) dissolving said light transmissive polymer in a mesogenic solvent having positive dielectric anisotropy; c) cooling the solution in bulk until said polymer material phase separates from the mesogenic solvent to form a spreadable liquid crystalline paste; and
thereafter,d) coating said liquid crystalline paste onto a substrate to form a thin electrically addressable film thereon. - View Dependent Claims (9, 10, 11)
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12. A method of producing a thin electrically addressable light modulating liquid crystalline film comprising the steps of:
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a) dissolving a monomeric material in a non-mesogenic solvent; b) polymerizing said monomeric material; c) adding a mesogenic solvent having positive dielectric anisotropy to the bulk solution of monomeric material and non-mesogenic solvent; d) removing said non-mesogenic solvent until the polymerized monomeric material phase separates from said solution to form a spreadable liquid crystalline paste; and
thereafter,e) coating said liquid crystalline paste onto a substrate to form a thin electrically addressable film thereon. - View Dependent Claims (13, 14, 15)
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16. An electrically addressable light modulating liquid crystalline paste formed by the process comprising the steps of:
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a) preparing a solution comprising a polymerizable monomeric material in a mesogenic solvent having positive dielectric anisotropy; b) polymerizing said solution in bulk until said monomeric material polymerizes and phase separates from the mesogenic solvent to form a spreadable liquid crystalline paste. - View Dependent Claims (17)
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18. An electrically addressable light modulating liquid crystalline paste formed by the process comprising the steps of:
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a) polymerizing a monomeric material to form a light transmissive polymer; b) dissolving said light transmissive polymer in a mesogenic solvent having positive dielectric anisotropy; c) cooling the solution in bulk until said polymer material phase separates from the mesogenic solvent to form a spreadable liquid crystalline paste.
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19. An electrically addressable light modulating liquid crystalline paste formed by the process comprising the steps of:
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a) dissolving a monomeric material in a non-mesogenic solvent; b) polymerizing said monomeric material; c) adding a mesogenic solvent having positive dielectric anisotropy to the bulk solution of monomeric material and non-mesogenic solvent; d) removing said non-mesogenic solvent until the polymerized monomeric material phase separates from said solution to form a spreadable liquid crystalline paste.
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Specification