Toa Nenryo Kogyo Kabushiki Kaisha

Toa Nenryo Kogyo, K. K.

Tokuo Makishima, Deceased

Chihiro Imai

Satoshi Ueki

By Nobuko Makishima, Legal Representative

Masayuki Kato

Yoshio Taguchi

Yuji Fujita

Mamoru Tachikawa

Tadashi Niwa

By Satoshi Ueki, Legal Representative

By Chichiro Imai, Legal Representative

Tadanao Kohora

Tadao Ikeda

A novel block copolymer is disclosed which includes a random ethylene-propylene copolymer segment (A) and a methacrylate segment (B). The block copolymer has a number-average molecular weight of about 1,000 to about 600,000 and a ratio of (A) to (B) of 15/85 to 97/3 by weight.

Block copolymers having ethylene-propylene copolymer blocks and

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

Block copolymer containing a methacrylate ester block

A copolymer of p-methylstyrene and N-substituted maleimide exhibits high temperature stability.

Methylstyrene maleimide copolymer

A catalyst component for the polymerization of olefins which is prepared by contacting a contact reaction product of (a) a metal oxide, (b) an organic magnesium compound, and (c) an alkoxy group-containing compound held in contact with (d) a titanium compound.

Catalyst component for polymerization of olefins

A polypropylene composition having superior clarity and good low-temperature impact resistance, said composition comprising 65 wt % to 95 wt % crystalline polypropylene and 5 wt % to 35 wt % of ethylene-propylene random copolymer containing higher than 70 wt % to 85 wt % of ethylene.

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Saitama, Japan

Tokuo Makishima, Deceased