FIELD: chemistry.
SUBSTANCE: disclosed is a method which involves heterofunctional polycondensation of polyphenylsilsesquioxane and polydiorganosiloxane of formula 
(I), where n=100-640, in an organic solvent medium in the presence of diethylhydroxyl amine at temperature 110-120°C and weight ratio of polyphenylsilsesquioxane to polydiorganosiloxane ranging from 10:90 to 50:50.
EFFECT: method enables to obtain block copolymers, cold curing vulcanisates of which, along with good physical and mechanical properties, have good oil-and-petrol resistance.
1 cl, 1 tbl, 4 ex
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