Japan Synthetic Rubber Co., Ltd.

Tooru Shibata

Toshio Teramoto

Kunio Goshima

Yoshiharu Hashiguchi

Yasuo Takeuchi

Yasumasa Takeuchi

Minoru Maeda

Noboru Oshima

Iwakazu Hattori

Mitsuhiko Sakakibara

Kenya Makino

Hiroharu Ikeda

Noboru Ohshima

Shinichi Kimura

Mikio Takeuchi

Masaaki Mawatari

Isao Nagaoka

Kan Mori

Minoru Hasegawa

Yutaka Obata

Kaoru Nakako

Sigeo Kawatani

Tatsuhiko Kikuchi

A hydrogenated diene block copolymer having a polystyrene-reduced number-average molecular weight of 50,000-600,000 which is a hydrogenation product of an (A)-(B) block copolymer in which (A) means an alkenyl aromatic compound polymer block and (B) means a conjugated diene homopolymer block wherein the vinyl content of the conjugated diene portion is more than 60%, or an alkenyl aromatic compound-conjugated diene random copolymer block wherein the vinyl content of the conjugated diene portion is 15% or more, an (A)-(B)-(C) block copolymer in which (A) and (B) are as defined above and (C) means an alkenyl aromatic compound-conjugated diene copolymer tapered block wherein the proportion of the alkenyl aromatic compound increases gradually, or an (A)-(B)-(A) block copolymer in which (A) and (B) are as defined above. Said hydrogenated diene block copolymer is useful as a modifier for polar resins, non-polar resins or both of them.

(Modified) hydrogenated diene block copolymer and composition comprising

A hydrogenated diene block copolymer having a polystyrene-reduced number-average molecular weight of 50,000-600,000 which is a hydrogenation product of an (A)-(B) block copolymer in which (A) means an alkenyl aromatic compound polymer block and (B) means a conjugated diene homopolymer block wherein the vinyl content of the conjugated diene portion is more than 60%, or an alkenyl aromatic compound-conjugated diene random copolymer block wherein the vinyl content of the conjugated diene portion is 15% or more, an (A)-(B)-(C) block copolymer in which (A) and (B) are as defined above and (C) means an alkenyl aromatic compound-conjugated diene copolymer tapered block wherein the proportion of the alkenyl aromatic compound increases gradually, or an (A)-(B)-(A) block copolymer in which (A) and (B) are as defined above and in which hydrogenation product at least 80% of the double bonds of the conjugated diene portion is saturated by the hydrogenation. Said hydrogenated diene block copolymer is useful as a modifier for polar resins, non-polar resins or both of them.

Hydrogenated diene block copolymer and composition comprising the same

Hydrogenated block copolymer and composition comprising the same

A hydrogenated diene block copolymer having a polystyrene-reduced number-average molecular weight of 50,000-600,000 which is a hydrogenation product of an (A)--(B) block copolymer in which (A) means an alkenyl aromatic compound polymer block and (B) means a conjugated diene homopolymer block wherein the vinyl content of the conjugated diene portion is more than 60%, or an alkenyl aromatic compound-conjugated diene random copolymer block wherein the vinyl content of the conjugated diene portion is 15% or more, an (A)--(B)--(C) block copolymer in which (A) and (B) are as defined above and (C) means an alkenyl aromatic compound-conjugated diene copolymer tapered block wherein the proportion of the alkenyl aromatic compound increases gradually, or an (A)--(B)--(A) block copolymer in which (A) and (B) are as defined above, in which block copolymer

A hydrogenated diene copolymer resin composition comprising (A) 5-70% by weight of a hydrogenated diene copolymer which is a hydrogenation product of a random copolymer of at least one conjugated diene and 3-50% by weight of an alkenyl aromatic compound having a number average molecular weight of 5,000-1,000,000 and a molecular weight distribution (Mw/Mn) of 10 or less, the vinyl content in the diene portion of the random copolymer being 10-90%, at least 70% of the olefinic unsaturation of the random copolymer being hydrogenated, and (B) 95-30% by weight of at least one resin selected from the group consisting of a polypropylene resin, a polyphenylene ether resin and an alkenyl aromatic compound polymer resin. The hydrogenated diene copolymer (A) can be used in combination with (B) a polyphenylene ether resin and (C) at least one member selected from the group consisting of a polyamide and a thermoplastic polyester in such a proportion that the amount of (A) is 1-50 parts by weight, the amount of (B) is 10-89 parts by weight and the amount of (C) is 10-89 parts by weight. The above composition has improved impact resistance and improved gloss and appearance of molded article.

Hydrogenated diene copolymer-containing resin composition and process

A process for producing a conjugated diene polymer, characterized by polymerizing at least one conjugated diene with a catalyst consisting of (A) a reaction product of a Lewis base and a carboxylate of a rare earth element of the lanthanum series represented by Ln(R.sup.1 CO.sub.2).sub.3 wherein Ln is a rare earth element of the lanthanum series having an atomic number of 57 to 71 and R.sup.1 is a hydrocarbon substituent having 1 to 20 carbon atoms, (B) an organic aluminum compound represented by AlR.sup.2 R.sup.3 R.sup.4 wherein R.sup.2, R.sup.3 and R.sup.4, which may be identical or different, represent hydrogen atoms or hydrocarbon substituents having 1 to 8 carbon atoms, excluding the case where all of R.sup.2, R.sup.3 and R.sup.4 are hydrogen atoms at the same time, and (C) an (alkyl)aluminum halide represented by AlX.sub.n R.sup.5.sub.3-n wherein X is Cl, Br, F or I; R.sup.5 is a hydrocarbon substituent having 1 to 8 carbon atoms; and n has a value of 1, 1.5, 2 or 3, or consisting of these (A), (B) and (C) components and (D) a conjugated diene. A polymer obtained by said process has a high cis-1,4-configuration content and is excellent in physical properties of vulcanizate.

Process for producing conjugated diene polymer using a solubilized

A process for preparing polybutadiene having a 1,2-configuration content of 5-40% and a cis-1,4-configuration content of 60% or more, which comprises polymerizing 1,3-butadiene in the presence of a catalyst consisting of:

Process for preparing polybutadiene having a 1,2-configuration content

High molecular weight cis-1,4-polyisoprene is produced by contacting isoprene with a catalyst formed by admixing (A) a titanium tetrachloride, (B) a trihydrocarbylaluminum and (C) a beta-diketone. The activity of this ternary catalyst is not adversely affected by such impurities as cyclopentadiene that are contained in the feed stock isoprene.

Catalytic production of a high molecular weight cis-1,4-polyisoprene

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Yokkaichi, Japan

Tooru Shibata