Crosslinkable, cellulose ester compositions and films formed therefrom
AssigneeEastman Chemical Company
InventorsKevin Wayne McCreight, Douglas Claire Hoffman, Wesley Raymond Hale
Life of this patent
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Abstract
New compositions for forming films for use in optical devices are provided. The compositions comprise a cellulose and a crosslinking agent dissolved or dispersed in a solvent system. Preferred celluloses are cellulose esters such as cellulose acetates, cellulose triacetates, cellulose acetate phthalates, and cellulose acetate butyrates. Preferred crosslinking agents are triazines such as those derived from melamine and benzoguanamine. The inventive compositions can be used to form, for example, protective and/or compensation films for use in polarizing plates.
Claims22
A method of forming a polarizing plate for use in optical display devices, said method comprising:
- providing a polarizing film having first and second outer surfaces;
- and applying a companion film to at least one of said first and second outer surfaces, said companion film comprising a cellulose crosslinked with a crosslinking agent, said cellulose being selected from the group consisting of cellulose ethers and cellulose esters, and said crosslinking agent having the formula
- wherein:
- each X is individually selected from the group consisting of phenyl groups and —NR2, where each R is individually selected from the group consisting of hydrogen, alkoxyalkyl groups, carboxyl groups, alkoxy groups, and hydroxymethyl groups;
- and
- at least one X being —NR2 and at least one R being selected from the group consisting of alkoxyalkyl groups, carboxyl groups, alkoxy groups, and hydroxymethyl groups.
A method of forming a polarizing plate for use in optical display devices, said method comprising:
- providing a polarizing film having first and second outer surfaces;
- and
- applying a companion film to at least one of said first and second outer surfaces, said companion film comprising a cellulose crosslinked with a crosslinking agent, said cellulose being selected from the group consisting of cellulose ethers and cellulose esters, and said crosslinking agent:
- comprising at least one group having the formula —OR′, where R′ is an alkyl;
- and
- being free of epoxy groups and groups having the formula
Dependencies are inferred from the claim text.