Toa Nenryo Kogyo, K. K.

Toa Nenryo Kogyo Kabushiki Kaisha

By Nobuko Makishima, Legal Representative

Tokuo Makishima, Deceased

Chihiro Imai

Satoshi Ueki

Masayuki Kato

Yoshio Taguchi

Tadashi Niwa

By Chichiro Imai, Legal Representative

By Satoshi Ueki, Legal Representative

This invention relates to a p-methyl styrene polymer represented by the following formula: ##STR1## Z denotes a group such as a functional group. Poly p-methylstyrene (PPMS) is lithiated by reaction with n-butyllithium. The lithiated PPMS is used to prepare polymers containing functional groups. As an example, a solution of PPMS (MW 260,000), 1.0 g in 20 ml of cyclohexane, was reacted with n-butyllithium, 8.5 mmol, and tetramethylethylenediamine, 8.7 mmol, for 20 hours to obtain a precipitate. The precipitate was dissolved in THF, and CO.sub.2 was blown into the solution. The solution was washed with an aqueous solution of HCl and dropped into methanol to obtain a solid polymer having carboxyl group functionality.

Process for producing a modified styrene polymer

A block copolymer is disclosed which includes an ethylene-propylene copolymer segment (A) and a tetrahydrofuran segment (B). The weight ratio of (A) to (B) is 5/95 to 95/5, and the block copolymer has a number-average molecular weight of about 1,000 to about 1,000,000.

Block copolymer containing block from tetrahydrofuran

Block copolymer containing tetrahydrofuran block

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Tokyo, Japan

By Nobuko Makishima, Legal Representative