Tosoh Corporation

Tatsuki Suzuki

Toru Seita

Takashi Yamamoto

Katsuya Shibata

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.

Growing community of inventors

Kawasaki, Japan

Tatsuki Suzuki