US 11,590,744 B2 · Shrink film

Abstract

Oriented, multilayer shrink films, either clear or opaque, comprise a core layer and at least one skin layer. The core layer has a thickness greater than the thickness of the at least one skin layer. The at least one skin layer comprises at least one cyclic-olefin copolymer as the predominant component thereof. The core layer comprises a blend of a polyolefin polymer and a polybutene-1 copolymer with ethylene, the butene-1 constituting over 75% by weight of the polybutene-1 copolymer. The film has a shrinkage of at least 20% in at least one of the machine and transverse directions of formation when said film is heated to a temperature of between 80 and 100° C. Optionally the films can include a propylene-based elastomer, a styrenic based block copolymer elastomer, reclaim including the components of the film, or combinations thereof.

Claims38

Dependent claims

An oriented, multilayer shrink film comprising a core layer and at least one skin layer, said core layer having a thickness greater than a thickness of said at least one skin layer, said at least one skin layer comprising at least one cyclic-olefin copolymer as a predominant component thereof, said core layer comprising a blend of:

(a) an olefin polymer which is a terpolymer;
(b) an olefin-based elastomer;
and (c) a butene-1 copolymer with ethylene, the butene-1 constituting over 75% by weight of the butene-1 copolymer and the butene-1 copolymer constituting 20-50% by weight of the core layer, said film having a Z-axis strength greater than 93 g/in, a shrinkage of at least 20% in at least one of a machine direction and a transverse direction of formation when said film is heated to a temperature of 80° C.

Dependencies are inferred from the claim text.

Shrink film

Life of this patent

Shrink film

Life of this patent

Abstract

Claims38