VINYLAROMATIC (CO) POLYMER REINFORCED BY RUBBER, HAVING AN OPTIMAL COMBINATION OF PHYSICAL AND MECHANICAL PROPERTIES AND HIGH SHINE

摘要

1. Rubber-reinforced vinyl aromatic (co) polymer comprising a polymer matrix and a rubber phase consisting of diene rubber dispersed and / or grafted onto a polymer matrix, wherein said rubber phase is selected from at least one rubber from: (i) linear diene rubber consisting of polybutadiene with a solution viscosity of 40 to 70 cP, measured in a solution of this rubber in an amount of 5 wt.% in styrene at a temperature of 25 ° C; the content of 1,2-vinyl from 5 to 35 wt.% and the content of 1,4-cis units from 20 to 85 wt.%; (ii) diene rubber of partially radial structure with a solution viscosity of less than 70 cP, in which at the end up to 15 a wt.%, preferably 1 to 12 wt.% polymer chains, a four-functional bonding agent is attached to form a radial terminal structure of the linear diene rubber chains; (iii) a three-chain diene rubber with a solution viscosity of less than 70 cP, i.e. linear diene rubber, consisting of polybutadiene, with a solution viscosity of 40 to 70 cP, measured in a solution of this rubber in an amount of 5 wt.% in styrene at a temperature of 25 ° C; vinyl content of 5 to 35 wt.% and 1,4-cis content of 20 to 85 wt.% connected to a trifunctional binding agent; (iv) a mixture of linear diene rubbers (i) and diene rubbers (v) radial structure with a maximum ratio between them (i) / (v from 99.5 / 0.5 to 85/15) with a solution viscosity of less than 70 cPs. 2. The rubber-reinforced vinyl aromatic (co) polymer according to claim 1, wherein the diene rubber in the diene rubber (ii) of a partially radial structure or in the diene rubber (v) of a radial structure is obtained from a polymer consisting of a 1,3-conjugated diene containing from 4 up to 6 a�