random copolymers of butadiene-isoprene with a trans-1,4 structure

摘要

random copolymers of butadiene-isoprene with a 1,4-trans structure, having a composiciónmolar butadiene / isoprene 32/68 and 98/2 between being crystalline oamorfos above copolymers depending on the isoprene content in which structures 1 , 4-cis and vinyl are not detected by standard analytical lastécnicas and wherein said copolymers are characterized in that they Mwcomprendido value between 200 x 103 and 500 x 103 and a Mw / Mn between 1.7 and 4.