ES378968A1 - Curing butadiene polymers - Google Patents

Abstract

Process for the preparation of hard, fast-curing resins of improved thermal and chemical resistance, including resistance to swelling in toluene, characterized in that the steps of preparing a substantially uniform mixture of: (a) 100 parts by weight of a butadiene polymer having an intrinsic viscosity corresponding to an average molecular weight of 12,500 to 55,000, at least 50 by weight of the polymer having a molecular weight of at least 10,000 and 95% by weight of the polymer, therefore less, a molecular weight of at least 2,000, with at least 80% of the units being butadiene repeats thereof with a pendant vinyl structure, and (b) a decomposable peroxycompound in the range: used temperature, which has a represented structure by the formula CH3C (R) 2O-OC (R) 2CH3, in which R represents an aryl or alkyl radical having 1 to 20 carbon atoms, the proportion of said peroxy compound being equivalent Before 0.5-6 parts by weight of dicumyl peroxide, and heating said mixture to a temperature of 120ºC to 216ºC for a minimum period of 20 seconds, said butadiene comprising at least 40% by weight of repeated butadiene units and the The remainder of said polymer essentially comprises repeating units of an alkenyl aromatic comonomer having no more than 20 carbon atoms, selected from a vinyl benzene or isopropenyl benzene, naphthalene or diphenyl, or nuclear substituted derivatives thereof, in which the Derived groups are radicals chosen from among alkyl, aralkyl, cycloalkyl or chlorine. (Machine-translation by Google Translate, not legally binding)