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US 5,091,467 AGranted
Controlled morphology barrier elastomers made from blends of syndiotactic 1,2-polybutadiene and ethylene-vinyl acetate-vinyl alcohol terpolymers
AssigneeThe Goodyear Tire & Rubber Company
InventorRoger N. Beers
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Abstract
An elastomer barrier composition comprises a melt blend of syndiotactic 1,2-polybutadiene, a terpolymer of ethylene, vinyl acetate and vinyl alcohol, and a compatibilizing agent. The melt blend is formed under suitable mixing and shear conditions such that the terpolymer exists as a separate domain in generally a flat or plate-like form. The elastomer barrier material can be utilized in rubber compositions such as in the innerliner of the tire.
Claims10
An innerliner of a tire containing a barrier composition, comprising;
- a blend of syndiotactic 1,2-structure containing polybutadiene, a saponified copolymer of ethylene, vinyl acetate, and vinyl alcohol, and a compatibilizing agent, wherein said compatibilizing agent is one or more unsaturated acids, esters, anhydrides or derivatives thereof, or polymers containing unsaturated acids, esters, anhydrides or derivatives thereof, wherein the amount of said syndiotactic microstructure in said polybutadiene is at least 80 percent by weight based upon the total weight of syndiotactic, atactic, and isotactic structure of said polybutadiene, wherein the amount of said terpolymer is form about 10 to about 40 percent by weight, wherein the amount of said compatibilizing agent is from about 0.2 to about 3 percent by weight, and wherein the amount of said polybutadiene is the difference, all based upon the total weight of said polybutadiene, said terpolymer, and said compatibilizing agent.
Dependencies are inferred from the claim text.