Denki Kagaku Kogyo Kabushiki Kaisha

Minoru Handa

Shigeki Horiie

Shinichiro Asai

Shin-Ichiro Asai

Kazuhiro Shirakawa

Hiroko Ogawa

Takashi Torikoshi

Takuzi Nishizawa

Block copolymers of a vinyl-substituted aromatic hydrocarbon and a conjugated diene, having alkali metal atoms linked to at least one terminal of the polymer chain are obtained by polymerizing vinyl-substituted aromatic hydrocarbon and conjugated diene monomers with use of an alkali metal or organo alkali metal initiator. The block copolymer thus obtained is treated with a polar reactant to introduce polar groups into the polymer chain terminal. Compositions for paints and printing inks are prepared by incorporating inorganic pigments into the block copolymer having the terminal polar group.

Compositions for paints and printing inks

A stable and non-polar solvent soluble alpha-methylstyrene-conjugated diene oligomer dilithium as a polymerization initiator is obtained by preparing a dilithium initiator solution by reacting lithium metal with alpha-methylstyrene in a polar solvent at low temperature, thereafter adding gradually a small amount of a conjugated diene to the dilithium initiator solution to consume completely the alpha-methylstyrene, and then adding additional conjugated diene in a certain amount so as to prepare the stable and non-polar solvent soluble alpha-methylstyrene-conjugated diene oligomer dilithium.

Organolithium polymerization initiators and their preparations

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Machida, Japan

Minoru Handa