Toray Industries, Inc.

Toray Thiokol Company Limited

Hiroyoshi Kuramoto

Takashi Taniguchi

Haruyo Sato

Shinzo Imamura

Akio Takahashi

Tadami Kamaishi

Hideaki Tanisugi

Keiichi Minami

A concrete article having a mixture layer comprising concrete and a polysulfide-modified epoxy resin as an intermediate layer between a concrete body and a cured layer of a polysulfide-modified epoxy resin, which concrete article is excellent in corrosion resistance, durability and workability, and shows good adhesion to the concrete body and to the cured layer of the polysulfide-modified epoxy resin. This concrete article can be produced by applying a coating composition containing the polysulfide-modified epoxy resin to the concrete body in an uncured state.

Concrete article and method of producing same

Novel indole derivatives of the general formula I can be obtained by reacting, directly or indirectly, N,N-dimethyl-3-indolemethylamine with a Schiff base of the general formula II, ##STR1## in which R.sup.1 is cyano or methoxycarbonyl, ethoxycarbonyl, propoxycarbonyl or butoxycarbonyl, and .phi. is phenyl. The successive hydrolysis of the indole derivatives of the general formula I in the presence of an acid and of a base gives tryptophane.

2-Diphenylmethyleneamino-3-indolylpropionitrile and alkyl esters of

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Ichihara, Japan

Hiroyoshi Kuramoto