Cellulose ester film
AssigneeKonica Corporation
InventorKoichi Saito
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Abstract
A cellulose ester film is disclosed which comprises a polyhydric alcohol ester, which is an ester of one or more kinds of monocarboxylic acids with an aliphatic polyhydric alcohol, wherein the cellulose ester film has a water vapor transmission rate of from 20 to 260 g/m2·24 hours measured under conditions of 25° C. and 90% RH.
Claims10
A cellulose ester film comprising a polyhydric alcohol ester in an amount of 5 to 20% by weight based on the weight of cellulose ester, the polyhydric alcohol ester being an ester of one or more kinds of monocarboxylic acids with an aliphatic polyhydric alcohol,
- wherein the cellulose ester film has a water vapor transmission rate of from 20 to 260 g/m2·24 hours measured under conditions of 25° C. and 90% RH (relative humidity), and the polyhydric alcohol ester has a molecular weight of from 300 to 1500, and
- wherein the cellulose ester film has a retention property of from 0.0 to 2.0%.
A cellulose ester film comprising a polyhydric alcohol ester having an aromatic ring or a cycloalkyl ring in the molecule, which is an ester of one or more kinds of monocarboxylic acids with an aliphatic polyhydric alcohol, a total number of the aromatic ring or the cycloalkyl ring being not less than 3,
- wherein the cellulose ester film has a water vapor transmission rate of from 20 to 260 g/m2·24 hours measured under conditions of 25° C. and 90% RH (relative humidity), and the polyhydric alcohol ester has a molecular weight of from 300 to 1500, and
- wherein the cellulose ester film has a retention property of from 0.0 to 2.0%.
A polarizing plate comprising a polarizing film and a cellulose ester film provided on both surfaces of the polarizing film, the cellulose ester film comprising a polyhydric alcohol ester, which is an ester of one or more kinds of monocarboxylic acids with an aliphatic polyhydric alcohol,
- wherein the cellulose ester film has a water vapor transmission rate of from 20 to 260 g/m2·24 hours measured under conditions of 25° C. and 90% RH (relative humidity), and the polyhydric alcohol ester has a molecular weight of from 300 to 1500, and
- wherein the cellulose ester film has a retention property of from 0.0 to 2.0%.
Dependencies are inferred from the claim text.