Abstract: A radiation resistant resin suitable for the manufacture of, for example, disposable medical supplies comprises a semicrystalline polypropylene or propylene-ethylene and from 1500 to 5000 ppm triallyl trimellitate. The resin exhibits substantially no increase in melt flow rate after irradiation to a dosage of up to 5 Mrads, and may contain up to about 5% by weight of a polybutylene and/or up to about 3000 ppm of a sorbital based clarifying agent.

Abstract: Heat-sealable thermoplastic elastomeric films comprise from approximately 35% to about 65% of an A-B-A block copolymer wherein "A" blocks are derived from polystrene or a polystrene homolog and said "B" blocks being derived from lower alkenes and from about 25% to about 55% of an ethylene vinyl acetate copolymer, the ethylene vinyl acetate copolymer comprising approximately 28% vinyl acetate. The films are heat-sealable to various substrates including polyvinyl chloride. Once sealed to the substrate, the film may be readily peeled from the substrate by the application of a low and relatively constant peel force. A method for measuring the peel strengths of the film is disclosed. The films are especially adapted to being heat-sealed to a substrate which forms, together with the substrate a package, or multiple serially connected packages.

Abstract: A lidstock film adapted to form a peelable seal with a substrate upon heat sealing comprises, a first layer of high density polyethylene, a second layer of ethylene vinyl acetate, and a third seal layer of a blend of a polyionomer and a low density polyethylene is disclosed. Also disclosed is a forming web adapted to form a peelable seal with a lidstock upon heat sealing, the forming web comprising a first seal layer of a mixture of a rubber and ethylene vinyl acetate, a second layer of a mixture of ethylene vinyl acetate and a linear low density polyethylene, and a third layer comprising linear low density polyethylene. The lidstock film and forming web are heat sealable at temperatures between 250.degree. F. and 350.degree. F. to form packages with peelable seals.

Abstract: Polymer compositions having a first and second portion selected from polypropylenes, polyethylenes, propylene-ethylene copolymers and mixtures thereof having enhanced crystallization properties and a method for producing the same are disclosed. Antioxidant is mixed with the first portion, 0.01 to 1.25 wt %, of the composition which is then irradiated to a dosage of 5-30 Mrads of ionizing radiation in air to induce cross linking. The irradiated first portion is then blended with the non-irradiated second portion. The cross-linked polymer is believed to provide nucleation sites for the initiation of crystallization, thereby enhancing crystallization of the polymer as evidenced by elevated DSC freeze points. Crystallization of the polyolefin is enhanced without any detrimental effects on hexane or xylene extractability of the polymer and without degrading the composition to any appreciable extent.

Abstract: Improved resin compositions for use in multiple cavity stretch blow molding processes comprising: (a) a propyleneethylene copolymer resin including from about 5% to about 15% of a second stage polymer characterized by a cycle time of T.sub.1, when used to produce containers in multiple cavity stretch blow molding processes; (b) from about 0.1% to about 1.0% of a nucleating agent prepared by irradiating in air a mixture of a propylene homo or copolymer and about 500 to about 3000 ppm of antioxidant with a sufficient amount of ionizing radiation to cause said nucleating agent to have a xylene insoluble content of at least 30%. The improved resin composition is characterized by a cycle time of T.sub.2 when used to produce containers in multiple cavity stretch blow molding processes such that the ratio of T.sub.2 /T.sub.1 is less than 0.95.

Abstract: A starch filled, coextruded degradable polyethylene film includes a starch filled inner layer positioned between two outer layers that contain a prodegradant. The outer layers of the film, which contain no starch, enable the film to retain desirable physical properties similar to conventional polyethylene film. The prodegradant causes the outer layers of the film to degrade under appropriate conditions exposing the starch filled inner layer. The starch in the inner layer then serves as a source of nutrients for microorganisms which consume starch, leaving a porous structure that is vulnerable to oxidation, hydrolysis, direct enzyme action or combinations of these processes.

Abstract: Compositions useful in the manufacture of soft, heat sealable films and sheeting material of improved strength are prepared from blends of about 30 to about 80 wt. % of ethylene - methyl acrylate copolymer (EMA) and about 20 to about 70 wt. % of very low density polyethylene (VLDPE) having a density in the range between about 0.902 and about 0.910 gm/cc.

Abstract: Compositions useful in the manufacture of soft, heat sealable films and sheeting material of improved strength are prepared from blends of about 30 to about 80 wt. % of ethylene-methyl acrylate copolymer (EMA) and about 20 to about 70 wt. % of very low density polyethylene (VLDPE) having a density in the range between about 0.902 and about 0.910 gm/cc.

Abstract: Novel, substantially amorphous copolymers of propylene and ethylene are disclosed. The polymers have properties which make them applicable for use, e.g., as hot melt adhesives and as blending components in roofing materials.

Abstract: A novel highly efficient process is disclosed for the production of substantially amorphous ethylene-propylene copolymers. The polymers have properties which make them applicable for use, e.g., as hot melt adhesives, as blending components in roofing materials, and as cable and wire flooding agents.