Protective films containing compatible plasticizer compounds useful in polarizing plates for displays and their method of manufacture
AssigneeEastman Kodak Company
InventorsTimothy C. Schunk, Donald R. Diehl, Daniel T. Linehan, Zora T. Marlowe, Deepak Shukla
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Abstract
Polymer films comprising plasticizer compounds represented by Structure 1 as described in the specification are useful as protective films in polarizing plates for display applications. Methods of manufacturing such polymer films and polarizing plates are also disclosed.
Claims31
A self-bearing polymer film comprising a polymer selected from cellulose esters, polycarbonate esters, and norbornene resins, which polymer film comprises, in a polymer phase, at least one plasticizer compound represented by the following structure:
- wherein:
- R1 and R2 are both non-aryl groups at the bond to the —C(═O)O— ester link;
- n is an integer of 2 or more, wherein each R2 may be the same or different;
- and
- at least one cycloalkyl group is present in either or both of R1 and R2, wherein the cycloalkyl group is a cyclohexyl or cyclopentyl group;
- wherein the self-bearing polymer film has mechanical, optical, and chemical properties for use as a protective layer disposed on one or both sides of a polarizing film to form a polarizing plate, the self-bearing polymer film having a thickness ranging from 5 to 200 microns, exhibiting an in-plane retardation ranging from 0.1 to 15 nm, an out-of-plane retardation ranging from −10 to −100 nm, and wherein the plasticizer compound is present in the range of about 1 to 30 weight percent.
A self-bearing polymer film comprising a polymer selected from cellulose esters, polycarbonate esters, and norbornene resins, and at least one plasticizer compound represented by the following structure:
- wherein:
- R1 and R2 are both non-aryl groups at the bond to the —C(═O)O— ester link;
- n is an integer of 2 or more, wherein each R2 may be the same or different;
- and
- one or more cycloalkyl groups are present in either or both R1 and R2, wherein the cycloalkyl group is a cyclohexyl or cyclopentyl group;
- wherein the self-bearing polymer film has mechanical, optical, and chemical properties for use as a protective layer disposed on one or both sides of a polarizing film to form a polarizing plate, the self-bearing polymer film having a thickness ranging from 5 to 200 microns, exhibiting an in-plane retardation ranging from 0.1 to 15 nm, an out-of-plane retardation ranging from −10 to −100 nm, and wherein the plasticizer compound is Present in the range of about 1 to 30 weight percent;
- the self-bearing polymer film further comprising a functional layer selected from the group consisting of an anti-glare layer, a low reflection layer, an anti-reflection layer, an optically anisotropic layer, and a liquid crystalline layer.
A composite film comprising a carrier substrate and a self-bearing polymer film, comprising a polymer selected from cellulose esters, polycarbonate esters, and norbornene resins, which polymer film comprises, in a polymer phase, at least one plasticizer compound represented by the following structure:
- wherein:
- R1 and R2 are both non-aryl groups at the bond to the —C(═O)O— ester link;
- n is an integer of 2 or more, wherein each R2 may be the same or different;
- and
- either or both the R1 and R2 comprise at least one cycloalkyl group wherein the cycloalkyl group is a cyclohexyl or cyclopentyl group,
- wherein the self-bearing polymer film has mechanical, optical, and chemical properties for use as a protective layer disposed on one or both sides of a polarizing film to form a polarizing plate, the self-bearing polymer film having a thickness ranging from 5 to 200 microns, exhibiting an in-plane retardation ranging from 0.1 to 15 nm, an out-of-plane retardation ranging from −10 to −100 nm, and wherein the plasticizer compound is present in the range of about 1 to 30 weight percent.
Dependencies are inferred from the claim text.