Method for the preparation of unsaturated dimers of .alpha.-meth

Details Method for the preparation of unsaturated dimers of .alpha.-meth Method for the preparation of unsaturated dimers of .alpha.-meth

1974-11-01

1976-10-12

Horwitz, D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 1512

Patent

active

039858189

ABSTRACT:
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.

REFERENCES:
patent: 2593417 (1952-04-01), D'Alelio
patent: 2766312 (1956-10-01), Sernuik
patent: 3763256 (1973-10-01), Massie

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