Polarizer laminates comprising coextruded liquid crystal polymer moieties and integral thermoplastic cover layers
AssigneeHoechst Celanese Corporation
InventorRandy Douglas Jester
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Abstract
This invention discloses laminates comprising dyed liquid crystalline polymer based polarizers in the middle with a non-peelable, non-liquid crystalline polymeric cover layers, prepared by a process of coextrusion. The laminates are suitable to prepare liquid crystal display devices therefrom. An illustrative laminate comprises a dyed liquid crystal polymer as the polarizing film with polyethylene terephthalate as the cover layers.
Claims17
A laminate comprising a layer of a polarizing film located between two layers of an optically transparent, adherent polymer, wherein said polarizing film comprises a mixture of a liquid crystalline polyester and a dichroic absorber, and said adherent polymer is a non-liquid crystalline polymer, and further wherein said laminate is prepared by coextruding said polarizing film with said adherent polymer layer, and still further wherein said polyester comprises repeat units corresponding to the formula :
- -P.sup.1 !.sub.m -P.sup.2 !.sub.n -P.sup.3 !.sub.q -P.sup.4 !.sub.r -P.sup.5 !.sub.s -
- wherein P.sup.1, P.sup.2, P.sup.3, P.sup.4 and P.sup.5 represent monomeric moieties with P.sup.1 being an aromatic hydroxy carboxylic acid or aromatic amino carboxylic acid, P.sup.2 being an aromatic dicarboxylic acid, P.sup.3 being a phenol, P.sup.4 being a second aromatic hydroxy carboxylic acid or aromatic amino carboxylic acid moiety different from P.sup.1, and P.sup.5 being a second phenolic moiety different from P.sup.3 ;
- and m, n and q represent mole percent of the respective monomers ranging from 5-70 mole percent individually, and r and s represent mole percent of the respective monomers ranging from 5-20 mole percent individually, with m+n+q+r+s totaling 100 mole percent.
A laminate comprising a layer of a polarizing film located between two layers of an optically transparent, adherent polymer, wherein said polarizing film comprises a mixture of a liquid crystalline polyesteramide and a dichroic absorber, and said adherent polymer is a non-liquid crystalline polymer, and further wherein said laminate is prepared by coextruding said polarizing film with said adherent polymer layer, and still further wherein said polyesteramide comprises repeat units corresponding to the formula:
- -P.sup.1 !.sub.m -P.sup.2 !.sub.n -P.sup.3 !.sub.q -P.sup.4 !.sub.r -P.sup.5 !.sub.s -
- wherein P.sup.1, P.sup.2, P.sup.3, P.sup.4 and P.sup.5 represent monomeric moieties with P.sup.1 being an aromatic amino carboxylic acid, P.sup.2 being an aromatic dicarboxylic acid, P.sup.3 being a phenol, P.sup.4 being an aromatic hydroxy carboxylic acid, and P.sup.5 being a second phenolic moiety different from P.sup.3, with m, n and q representing mole percent of the respective monomers ranging from 5-70 mole percent individually, and with r and s representing mole percent of the respective monomers, r and s being 5-20 mole %.
Dependencies are inferred from the claim text.