FIELD: production of plastics. SUBSTANCE: $$$-methyl styrene is affected by dimerization, the process is carried out at 30-40 C in the presence of 70-75 % sulfuric acid and ferrum sulfate or mixture of ferrum, chromium, copper and nickel sulfates (their quantity being 0.03 weight % as calculated for monomer). Rate of conversion of monomer is 12-28 % per 1 hour. EFFECT: improves efficiency of the method.
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