Elastomeric films having increased tear resistance

A split-layer thermoplastic film comprising:

• a structure A-(B-C)n-B-A, wherein A and C are inelastic layers each having a thickness and each comprising individually at least one of polymeric compositions A and C;
• B is an elastic layer comprising polymeric composition B, and n is 1 or 2, and wherein:
• the layers comprising (B-C)n-B have a combined thickness x;
• said polymeric compositions A and C comprise a polyolefin selected from the group consisting of polyethylene, polypropylene, or homopolymers, copolymers and combinations thereof;
• said polymeric composition B comprises styrenic block copolymers, elastomeric olefinic block copolymers, and mixtures thereof;
• and
• wherein the thickness of C comprises 5% or less of the thickness of the film;
• and wherein the film has a notched Elmendorf tear strength of at least twice the notched Elmendorf tear strength of a comparative thermoplastic film having the structure ABA, wherein A and B comprise substantially the same polymeric compositions A and C as the thermoplastic film, and wherein the B-layer of the comparative thermoplastic film has a thickness y which is substantially equal to x.

A split-layer thermoplastic film comprising:

• a structure A-(B-C)n-B-A, wherein n=2, A and C are inelastic layers each having a thickness and each comprising individually at least one of polymeric compositions A and C;
• B is an elastic layer comprising polymeric composition B, and wherein:
• the layers comprising (B-C)n-B have a combined thickness x;
• polymeric compositions A and C comprise an inelastic polymer;
• polymeric composition B comprises an elastomeric polymer;
• and
• wherein the thickness of C comprises 5% or less of the total thickness of the film;
• and wherein the film has a notched Elmendorf tear strength of at least twice the notched Elmendorf tear strength of a comparative thermoplastic film having the structure A-B-A, wherein A and B comprise substantially the same polymeric compositions A and B as the thermoplastic film, and wherein the B-layer of the comparative thermoplastic film has a thickness y which is substantially equal to x.