Film for pellicle

Details Film for pellicle Film for pellicle

1991-06-10

1992-12-15

Schofer, Joseph L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525 60, 525340, 525363, 525371, 525367, C08F 800

Patent

active

051717859

ABSTRACT:
A pellicle film comprised of a resin prepared by reducing a polyvinyl acetal of the formula: ##STR1## wherein R is a C1-3 alkyl group and the vinyl acetate content "y/(x+y+z)" is not larger than 0.1 and the degree of acetalization "z/(x+y+z)" is at least 0.6. This pellicle film exhibits a reduced UV absorption in the vicinity of 365 nm and is durable against irradiation with UV rays, especially i-line of a mercury arc light.

REFERENCES:
patent: 4499231 (1985-02-01), Ward et al.
patent: 4513117 (1985-04-01), Fries

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