Process of producing high purity bis(4-hydroxyphenyl)sulfides an

Details Process of producing high purity bis(4-hydroxyphenyl)sulfides an Process of producing high purity bis(4-hydroxyphenyl)sulfides an

1991-04-10

1992-12-29

Cintins, Marianne M.

Organic compounds -- part of the class 532-570 series

Organic compounds

Sulfur containing

C07C31914

Patent

active

051753723

ABSTRACT:
In a process of producing high purity bis(4-hydroxyphenyl)sulfides which comprises reacting phenols with sulfur dichloride in an organic solvent, the improvement comprising: reacting the phenols with sulfur dichloride in a nonpolar organic solvent; removing partly or wholly the nonpolar organic solvent after the reaction; adding a polar organic solvent to the reaction mixture to dissolve the reaction mixture therein at elevated temperatures; and crystallizing out the high purity bis(4-hydroxyphenyl)sulfides.
There is further provided a high performance heat-sensitive recording material which comprises high purity bis(4-hydroxy-3-methylphenyl)sulfide thus prepared and having a melting point in the range of from 123.9.degree. C. to 124.9.degree. C. as a developer and a fluoran compound as a color former.

REFERENCES:
patent: 3390190 (1968-06-01), Curtis et al.
patent: 3678115 (1972-07-01), Fujisawa et al.
patent: 4380671 (1983-04-01), Yamaguchi et al.

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