Elastomeric films having low tear propagation
AssigneeBerry Film Products Company, Inc.
InventorIyad Muslet
Life of this patent
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Abstract
Multilayer thermoplastic films, and laminates and articles comprising the films, wherein the film comprises at least one inner layer and at least two outer layers, wherein the inner layer comprises a polymeric composition comprising from about 55% to about 95% of one or more non-hydrogenated styrenic block copolymers, olefinic block copolymers, or combinations thereof; and each outer layer comprises at least 20% polypropylene and has a thickness of from about 5% to about 15% of the total film thickness, and further wherein the film has a constant force tear propagation of about 20% or less.
Claims20
A multilayer thermoplastic film comprising an inner layer and two outer layers, wherein the inner layer comprises a polymeric composition comprising (a) from about 50% to about 95% of one or more non-hydrogenated styrenic block copolymers selected from the group consisting of SBS, SIS, SIBS;
- and (b) an olefinic block copolymer;
- and wherein each outer layer comprises polypropylene and polyethylene, the polypropylene being at least 20% by weight, and wherein each outer layer has a thickness of from about 5% to about 15% of the total film thickness.
A laminate comprising a substrate and a multilayer thermoplastic film, said film comprising an inner layer and two outer layers, wherein the inner layer comprises a polymeric composition comprising (a) from about 50% to about 95% of one or more non-hydrogenated styrenic block copolymers selected from the group consisting of SBS, SIS, SIBS;
- and (b) an olefinic block copolymer;
- and wherein each outer layer comprises polypropylene and polyethylene, the polypropylene being at least 20% by weight, and each outer layer has a thickness of from about 5% to about 15% of the total film thickness.
Dependencies are inferred from the claim text.