Mitsui Toatsu Chemicals, Incorporated

Toshio Itakura

Yoshio Morimoto

Satoshi Numata

Tsutomu Takase

Kunio Hanauye

Mitsuhiro Iwasa

Yoshiro Shimizu

A process for producing a phenolic resin comprising condensing a phenol component and an aldehyde component, characterized in that the phenol component comprises (high-molecular-weight phenolic compounds which are left after bisphenol A-containing by-products formed in the production of bisphenol A by condensing acetone and phenol in the presence of an acid catalyst are treated at a high temperature of at least 150.degree. C. in the presence of an alkaline catalyst to remove low-boiling components therefrom.

Process for production of phenolic resin from bisphenol-A by-products

Unsaturated dimers which contain 2,4-diphenyl-4-methyl-1-pentene as their main component (i.e., in an amount of greater than 95%) are produced by reacting an .alpha.-methylstyrene at a temperature of from 20.degree. to 100.degree.C. in the presence of a sulfonic acid type cation-exchange resin catalyst and in the further presence of a primary or secondary monohydric alcohol containing from 2 to 5 carbon atoms. By this reaction, side products including a saturated dimer of 1,1,3-trimethyl-3-phenylindane, trimers and higher polymers are produced only in an extremely small amount. The unsaturated dimers are very useful as a molecular weight modifier when employed, instead of dodecylmercaptans, for the production of polymers such as an ABS resin, an AS resin, and the like.

Method for the preparation of unsaturated dimers of

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Okazaki, Japan

Toshio Itakura