Patent ID: 9023924
Filing Date: 2015-05-05
Classification: C08C,C08F,C08G

Abstract:
1. A process for preparing copolymer of 1,3-butadiene and styrene containing in its main chain a random segment, followed by a block having a different structure to the main chain, homopolymeric or copolymeric, functionalized and characterized by comprising the steps of: a first step of random copolymerization corresponding to an aromatic vinyl structure monomer and a conjugated diene with percentage relationship ranging between monomers of 5% to 50% w/w, for the aromatic vinyl monomer, and ranging from 50% to 95% w/w for the conjugated diene; a second step of adding a determined quantity of the monomer(s) in a temperature range of between 55° C. and 90° C., with the reactor pressure ranging from 2 Kgf/cm a third step of adding functionalization compound of the copolymer in a temperature range of between 60° C. and 80° C., in the same pressure range as used in the prior step; and a stabilization step comprising the addition of antioxidants trinonylphenylphosphite and octadecyl 3,5-di-t-butyl-4-hydroxyhydrocinnamate.