Kanegafuchi Kagaku Kogyo Kabushiki Kaisha

Hayashi Uchino

Kiyoshi Watanabe

Takehisa Ohashi

Fumiya Nagoshi

Masaaki Azuma

Hideyuki Arakawa

Masaki Matsuo

Mitsuru Echigoya

A sulfate of tetrahydrobiopterin having the formula (I): ##STR1## and a process for preparing the same, which comprises crystallizing tetrahydrobiopterin from an aqueous medium containing sulfuric acid. The sulfate of the (6R)-form of (1) has a high crystallinity and the process easily gives a sulfate of the (6R)-form

Sulfate of 5,6,7,8-tetrahydro-L-erythro-biopterin and process for

A method of producing a polymer or copolymer solution of vinyl chloride series, wherein polymerization of 100 parts by weight of a monomer mixture of at least 50 weight percent of vinyl chloride and less than 50 weight percent of one or more monomers copolymerizable therewith is carried out in a solvent mixture consisting essentially of 30 to 55 weight percent water, remainder N,N-dimethyl formamide, in the presence of 0.5 to 5 parts by weight of a salt of a monomeric compound having a sulphonic acid group and using an initiator for radical polymerization.

Method of producing polymer solutions of polymers or copolymers of vinyl

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Kobe, Japan

Hayashi Uchino