Agency of Industrial Science and Technology

Director-general of the Agency of Industrial Science and Technology

Seiichi Mima

Masaru Miya

Susumu Yoshikawa

Disclosed are polymers of metal salts of itaconic acid monoester and copolymers of the said metal salts with vinyl monomer, having excellent optical properties such as high refractive index and transparency. The polymers and copolymers are obtained by irradiating with radioactive rays a polymerizable ingredient which is one member selected from the group consisting of (1) one metal salt of itaconic acid monoester, (2) a mixture of two or more metal salts of itaconic acid monoester and (3) a mixture of at least one metal salt of itaconic acid monoester with vinyl monomer. Further, a polymerizable ingredient prepared by adding to the aforementioned polymerizable ingredient a polymerization catalyst is subjected to thermal treatment to produce a polymer.

Polymers with high transparency and refractive index and process for

Hydrophilic polymer membranes useful as semi-permeable membranes or ultrater membranes, are manufactured by forming a film from an aqueous solution containing polyvinyl alcohol and a chitosan salt and then subjecting the film to an alkali treatment.

Growing community of inventors

Toyonaka, Japan

Seiichi Mima