K-type polarizer and preparation thereof
Assignee3M Innovative Properties Company
InventorsTodd D. Jones, Duane D. Fansler, Robert T. Fitzsimons JR., Wayne S. Mahoney, Kevin M. Lewandowski, Michael S. Wendland, Babu N. Gaddam
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Abstract
A process for preparing a polarizer is described whereby a pre-polarizing article comprising an oriented, vinylalcohol polymer film layer, and an acid donor layer comprising a thermal acid generator, is exposed to radiant energy at a temperature sufficient to effect a partial dehydration of the vinylalcohol polymer to a vinylalcohol/poly(acetylene) copolymer.
Claims50
A process for preparing a polarizer comprising the step of:
- heating a pre-polarizing article to activate a thermal acid generator,
- said pre-polarizing article comprising:
- a uniaxially oriented vinylalcohol polymer film layer, and
- an acid donor layer comprising a thermal acid generator;
- wherein said thermal acid generator has an activation temperature of 200° C. or less.
The process of 1 wherein said acid donor layer comprises a mixture of said thermal acid generator and an amorphous polymer.
A process for preparing a polarizer comprising the steps of:
- a. providing an article comprising an oriented, vinylalcohol polymer film;
- b. coating a surface of said oriented, vinylalcohol polymer film with a polymer composition comprising a thermal acid generator;
- c. laminating said donor layer with a barrier layer;
- and
- d. exposing said vinylalcohol polymer film to thermal energy.
A K-type polarizer comprising at least one layer of an oriented poly(vinyl alcohol)/poly(acetylene) copolymer and an acid donor layer containing residue from a thermal acid generator.
Dependencies are inferred from the claim text.