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US 9,309,360 B2Granted
Cellulose ester based quarter wave plates having normal wavelength dispersion
AssigneeEastman Chemical Company
InventorsBin Wang, Thauming Kuo, Michael Eugene Donelson, Douglas Stephens McWilliams
Life of this patent
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Abstract
The present invention pertains to an optical film for use as a quarter wave plate (QWP) having a normal wavelength dispersion curve. More specifically, this invention relates to a quarter wave plate based on cellulose ester polymer and fused ring additives.
Claims25
A uniaxially or biaxially stretched optical film comprising:
- (a) a cellulose ester polymer;
- and
- (b) an additive having the structure below:
- wherein
- DISK represents a naphthalene group;
- A is —OOC—;
- Z is an aryl group having 6 to 30 carbon atoms;
- Y is each independently a halogen or an alkyl, alkoxy, or alkanoyl group having 1 to 20 carbon atoms;
- m=0, 1, 2, 3, or 4;
- and
- n=0, 1, 2, or 3.
8 more elements
A uniaxially or biaxially stretched optical film comprising:
- (a) a cellulose ester polymer and
- (b) an additive having the structure below:
- wherein DISK represents a disk-like moiety having a fused ring structure, A is each independently —COO—, —OOC—, —CO—, —CONH—, —NHCO—, —O—, or —S—;
- Z is each independently an aryl, alkyl, ethoxylated alkyl, or ethoxylated aryl group, having 1 to 30 carbon atoms;
- Y is each independently a halogen or an alkyl, alkoxy, or alkanoyl group, having 1 to 20 carbon atoms, m=0, 1, 2, 3, or 4;
- n is the number of the independent -A-Z substituents on the DISK, n=0, 1, 2, or 3;
- and wherein the additive is 2-naphthyl benzoate.
4 more elements
A uniaxially or biaxially stretched optical film comprising:
- (a) a cellulose ester polymer;
- and
- (b) an additive having the structure below:
- wherein DISK represents a disk-like moiety having a fused ring structure, A is each independently —COO—, —OOC—, —CO—, —CONH—, —NHCO—, —O—, or —S—;
- Z is each independently an aryl, alkyl, ethoxylated alkyl, or ethoxylated aryl group, having 1 to 30 carbon atoms;
- Y is each independently a halogen or an alkyl, alkoxy, or alkanoyl group, having 1 to 20 carbon atoms, m=0, 1, 2, 3, or 4;
- n is the number of the independent -A-Z substituents on the DISK, n=0, 1, 2, or 3;
- and wherein the cellulose ester polymer is selected from the group consisting of cellulose acetate (CA), cellulose acetate propionate (CAP), and cellulose acetate butyrate (CAB) and the additive is 2-naphthyl benzoate.
5 more elements
Dependencies are inferred from the claim text.