Process of producing high purity bis(4-hydroxyphenyl) sulfides and heat-sensitive recording materials contaning the same
申请人:SEITETSU KAGAKU CO., LTD.
公开号:EP0346824A2
公开(公告)日:1989-12-20
In a process of producing high purity bis(4-hydroxyphenyl)sulfides which comprises reacting phenols with sulfur dichloride in organic solvents, the improvement comprising: reacting the phenols with sulfur dichloride in nonpolar organic solvents; removing partly or wholly the nonpolar organic solvents after the reaction; adding polar organic solvents to the reaction mixture to dissolve the reaction mixture therein at elevated tempertures; 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°C to 124.9°C as a developer and a fluoran compound as a color former.