| abstract |
A masterbatch composition comprising a glass bubble dispersed in a blend of syndiotactic 1,2-polybutadiene and cis-1,4-polybutadiene is disclosed. The glass bubbles are present in an amount of at least 30% by weight, based on the total weight of the masterbatch composition. Rubber compositions and vulcanized rubbers prepared from the masterbatch composition are disclosed, as well as methods for making rubber compositions from masterbatch compositions. |