Elastomer compositions and method of making them

A film comprising a layer formed of an elastomeric composition, the elastomeric composition comprising a mixture of:

• about 20-80% by weight of a high performance elastomer;
• about 20-80% by weight of a low performance elastomer;
• and
• about 1-10% by weight of a graft copolymer of the high and low performance elastomers;
• wherein the graft copolymer is selected from the group consisting of a) block copolymers in which a block of the high performance elastomer is chemically attached to a backbone molecule of the low performance elastomer, b) block copolymers in which a block of the low performance elastomer is chemically attached to a backbone molecule of the high performance elastomer, and c) combinations thereof;
• and
• the graft copolymer is formed during solid state shear pulverization of the high and low performance elastomers at a temperature below the melting or softening temperatures of both elastomers.

A fabric comprising at least one layer formed of an elastomeric composition, the elastomeric composition comprising a mixture of:

• about 20-80% by weight of a high performance elastomer;
• about 20-80% by weight of a low performance elastomer;
• and
• about 1-10% by weight of a graft copolymer of the high and low performance elastomers;
• wherein the graft copolymer is selected from the group consisting of a) block copolymers in which a block of the high performance elastomer is chemically attached to a backbone molecule of the low performance elastomer, b) block copolymers in which a block of the low performance elastomer is chemically attached to a backbone molecule of the high performance elastomer, and c) combinations thereof;
• and
• the graft copolymer is formed during solid state shear pulverization of the high and low performance elastomers at a temperature below the melting or softening temperatures of both elastomers.

An elastomeric composition, comprising a mixture of:

• about 20-80% by weight of a high performance elastomer;
• about 20-80% by weight of a low performance elastomer;
• and
• about 1-10% by weight of a graft copolymer of the high and low performance elastomers;
• wherein the composition is prepared by combining a masterbatch including a relatively higher concentration of the copolymer, with an additional amount of high performance elastomer, low performance elastomer, or high and low performance elastomers;
• the graft copolymer is selected from the group consisting of a) block copolymers in which a block of the high performance elastomer is chemically attached to a backbone molecule of the low performance elastomer, b) block copolymers in which a block of the low performance elastomer is chemically attached to a backbone molecule of the high performance elastomer, and c) combinations thereof;
• and
• the graft copolymer is formed during solid state shear pulverization of the high and low performance elastomers at a temperature below the melting or softening temperatures of both elastomers.