Asahi Kasei Kogyo Kabushiki Kaisha

Kuniaki Sakamoto

Kunio Satake

Yasushi Sato

Isaburo Fukawa

Toshio Ibaragi

Hiroshi Harada

Tsuyoshi Yamada

Kiyoshi Hayakawa

Takeshi Wada

Osamu Suzuki

This invention provides a concentrated latex of synthetic rubbers almost without causing precipitation or coagulation of the latex components.

Concentrated latex of synthetic rubbers and the method for the

Novel rubbery polymer having a uniform and broad molecular weight distribution, a ratio of weight average molecular weight to number average molecular weight of 3 or more, a content of monovinyl aromatic compound of 0 to 30% by weight, a bonding manner of conjugated diolefin of 60% or more of 1,4-linkage and improved processability and physical properties can be obtained by circulating living polymer in the polymerization or copolymerization of conjugated diolefins or copolymerization of conjugated diolefin and monovinyl aromatic hydrocarbon carried out with a lithium-based catalyst.

Method for producing novel rubbery polymers from diene monomers

A novel high-impact polystyrene composition superior to conventional high-impact polystyrene composition, in low temperature high-impact properties, tensile strength, processability, toughness, stiffness, etc. can be obtained by a radical polymerization of a mixture of (1) 2-20% by weight of a random copolymer having a composition of continuously and gradually reduced styrene content along the polymer chain of the copolymer which is obtained by the solution polymerization of butadiene and styrene in the presence of a lithium base catalyst and (2) 80-98% by weight of styrene, carried out in bulk polymerization manner or in a manner in which bulk and suspension polymerizations are used in series.

Method of producing polystyrene composition

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Kawasaki, Japan

Kuniaki Sakamoto