Block diene elastomer for rubber compositions that can be used in pneumatic tires

摘要

The invention relates to a block diene elastomer corresponding to the following formula:;where:
n and m are each an integer of greater than or equal to 0, such that n+m≧1 and n+m≦20,each A block is composed of a polybutadiene,each B block is composed of a diene elastomer, the molar content of units resulting from conjugated dienes of which is greater than 15%, the B blocks being identical to one another,X is an organic or inorganic group which can comprise a functional group which interacts with a reinforcing filler,the number-average molecular weight Mn1 of each A block varies from 2 500 to 20 000 g/mol,the number-average molecular weight Mn2 of each B block varies from 80 000 to 350 000 g/mol, andthe content of 1,2- linkages in each A block is between 1 and 20%.

主权项

1. Block diene elastomer corresponding to the following formula: where:
n and m are each an integer of greater than or equal to 0, such that n+m≧1 and n+m≦20,each A block is composed of a polybutadiene,each B block is composed of a diene elastomer, the molar content of units resulting from conjugated dienes of which is greater than 15%, the B blocks being identical to one another,X is an organic or inorganic group which can comprise a functional group which interacts with a reinforcing filler,the number-average molecular weight Mn1 of each A block varies from 2 500 to 20 000 g/mol,the number-average molecular weight Mn2 of each B block varies from 80 000 to 350 000 g/mol, andthe content of 1,2- linkages in each A block is between 1 and 20%.