Abstract: Films of low ether solubles content, satisfactory mechanical properties, and a greatly improved heat seal impact strength can be made from butene-1 polymers which are stereoregular, predominantly isotactic, thermoplastic elastomers (referred to herein as SEPB) and from blends of these polymers with conventional copolymers of butene-1 with small amounts of ethylene (PBE). Because of the low ether solubles content the films are useful for food and medical packaging.Films of low ether solubles content, satisfactory mechanical properties, and excellent heat seal impact strength are produced from SEPB and preferably from blends of SEPB with small amounts of polypropylene and, optionally, high density polyethylene or a crystallization nucleating agent.Mechanical properties of SEPB films are improved by addition of conventional PBE. Conversely, the heat seal impact strength of conventional PBE films is greatly improved and mechanical properties are synergistically improved by addition of minor proportions of SEPB.

Abstract: A package for blood and/or intravenous solutions which is nontoxic, autoclavable, retains its strength when dropped, sufficiently flexible and is of substantially reduced material cost which comprises an outer layer blend of propylene-ethylene copolymer and butene-1-ethylene copolymer, which is laminated to an inner layer blend of butene-1-ethylene copolymer and propylene-ethylene copolymer. The copolymers are random and the thickness ratio of the inner layer blend to the outer layer blend is 4:1.

Abstract: The crystallization from the melt of an isotactic butene-1 homopolymer composition, isotactic butene-1-ethylene copolymer or isotactic butene-1-propylene copolymer composition is promoted by adding a small amount of stearamide and high density polyethylene as nucleating agents. The two nucleating agents cooperate in a synergistic fashion, resulting in much faster processing rates.

Abstract: A heat sealable blend of a butene-1-ethylene copolymer, about 2 to 9% by weight of polypropylene and from about 0.02 to 1.5% by weight of high density polyethylene can be processed at high line speed in the blown-bubble extrusion process to form films or sheets exhibiting improved heat sealing characteristics, processability, tear strength and other properties.

Abstract: Molecularly oriented films, and compositions used therein, comprise blends of a first EVA copolymer having a relatively low VA content, and a second EVA copolymer having a relatively high VA content. The blend exhibits a balance of properties which permit ready processability for orientation, while affording high levels of strength, particularly at elevated temperatures. Consequently laminates may be produced which are well suited for shrink packaging of meat, especially when a high oxygen barrier resin provides one layer thereof.