Title: Process for the production of 1,2-polybutadiene with regulated molecular weight

Abstract: In the production of 1,2-polybutadiene by contacting 1,3-butadiene with a catalyst composed of (A) a cobalt compound, (B) an organic phosphine compound, (C) trialkylaluminum and (D) water in an amount of 0.25 to 1.5 moles per mole of said trialkylaluminum, the addition of (E) at least one compound selected from the group consisting of allyl halides, alkyl-substituted allyl halides, benzyl halides, alkyl-substituted benzyl halides, and tertiary aliphatic halides to the reaction system enables the molecular weight of the objective 1,2-polybutadiene to be regulated to any desired value without causing any change in microstructure and degree of crystallization of the product and also without deteriorating so much the polymerization activity.

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Inventors: Makino, Kenya (Kuwana, JP)
Ishikawa, Tsunezo (Suzuka, JP)
Komatsu, Koei (Tokyo, JP)

Application Number: 910429
Filing Date: 1978-05-30
Publication_date: 1979-11-27
Assignee: Japan Synthetic Rubber Co., Ltd. (Tokyo, JP)
Primary Class(es): 526/92 526/139, 526/144
Other Classes:
US Patent Ref:

3284431	Nov, 1966	Gippin	526/144.
3386983	Jun, 1968	Witte et al.	526/144.
3498963	Mar, 1970	Ichikawa et al.	260/94.
3928303	Dec, 1975	Yasui et al.	526/92.
3983183	Sep, 1976	Kampf	526/139.

Other Refs: 115778845-1191647-29791971746

Nov, 1963	DE
Apr, 1970	JP
Aug, 1972	JP
Oct, 1964	GB

Primary Examiner: Hamrock, William F.
Assistant Examiner:
Attorney: Oblon, Fisher, Spivak, McClelland & Maier