Mitsui Toatsu Chemicals, Incorporated

Eiichi Noda

Yoshiaki Noguchi

Isamu Yamamoto

Katsuyoshi Sasagawa

Masao Imai

Noboru Kawasaki

Shigenobu Nakayama

A composition obtained by incorporating a benzenedithiol nickel complex in a liquid formulation containing a solvent and, as a binder, an organic polymer or containing a solvent, organic color-producing substance, acidic substance and binder suitable for producing a laser beam recording/reading means having an absorption band in the region of 800-950 nm.

Composition suitable for use in the production of laser beam

A process for producing 2-mercaptoethylamine hydrohalides of the general formula ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are identical or different, and each represents a hydrogen atom, a lower alkyl group, a hydroxy-substituted lower alkyl group or a phenyl group, and X represents a halogen atom, which comprises reacting a 2-mercaptothiazoline of the general formula ##STR2## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are as defined above, with a 2-halogenoethylamine hydrohalide of the general formula ##STR3## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4 and X are as defined above, in the presence of water.

Process for producing 2-mercaptoethylamine hydrohalides

A process for preparing an organic phosphorous compound of the general formula ##STR1## wherein R.sub.A represents ##STR2## where X.sup.1 is a halogen atom, Y is --CH.sub.2 -- or --CH.sub.2 --C.sub.2 --, and

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Yokohama, Japan

Eiichi Noda