Exxon Chemical Patents, Inc.

Exxonmobil Chemical Patents Inc.

Exxonmobile Chemical Patents Inc.

Andrew J Peacock

Weiqing Weng

Eric John Markel

Armen H Dekmezian

Paul Mark Henrichs

Richard R Eckman

The present invention is broadly directed to a process for copolymerizing one or more alpha-olefins and one or more di-olefin monomers in the presence of at least one stereospecific metallocene catalyst system and at least one non-stereospecific metallocene catalyst system. Crosslinking of at least a portion of the mixture of polymer segments is accomplished during the polymerization of the composition by incorporation of single di-olefin comonomers into two polymer segments.

Method of preparation of crosslinked blends of amorphous and crystalline polymers

The present invention is broadly directed to a polyolefin polymer composition produced by copolymerizing one or more alpha-olefins and one or more di-olefin monomers in the presence of at least one stereospecific metallocene catalyst system and at least one non-stereospecific metallocene catalyst system. The polymer composition so produced contains amorphous polymer segments and crystalline polymer segments in which at least some of the segments are crosslinked. Both the amorphous and the crystalline polymer segments are copolymers of one or more alpha-olefins and one or more di-olefin monomers. Crosslinking of at least a portion of the mixture of polymer segments is accomplished during the polymerization of the composition by incorporation of single di-olefin comonomers into two polymer segments.

Crosslinked blends of amorphous and crystalline polymers and their applications

The invention relates to a thermoplastic elastomer composition comprising a branched olefin copolymer derived from olefinically unsaturated monomers capable of insertion polymerization having A) a T.sub.g as measured by DSC less than or equal to 10.degree. C.; B) T.sub.m greater than 80.degree. C.; C) an elongation at break of greater than or equal to 300%; D) a tensile strength of greater than or equal to 1,500 psi (10,300 kPa); and E) an elastic recovery of greater than or equal to 50%. The invention also relates to process for preparing the invention composition comprising: A) polymerizing ethylene or propylene and optionally, one or more copolymerizable monomers in a polymerization reaction under conditions sufficient to form copolymer having greater than 40% chain end-group unsaturation; B) copolymerizing the product of A) with ethylene and one or more comonomers so as to prepare said branched olefin copolymer. The branched olefin copolymer compositions of the invention are suitable as replacements for styrene block copolymer compositions and in other traditional thermoplastic elastomer applications.

Thermoplastic elastomer compositions from branched olefin copolymers

Modifiers for ethylene copolymers for use in hot melt adhesives are provided, particularly modifiers for ethylene vinyl acetate-based adhesives which improve adhesive properties are provided. Blends comprising ethylene copolymers, modifiers and tackifiers and applications thereof are also provided for.

Ethylene based hot melt adhesives and modifiers for those hot melt

This invention relates to a ternary blend of 25 to 45 wt. % random polypropylene copolymer, 20 to 40 wt. % ethylene propylene rubber and 30 to 45 wt. % high density polyethylene having excellent low temperature impact resistance and useful for producing molded articles.

Thermoplastic olefins

The addition of small amounts of low molecular weight visco-elastic rubber material to rubber-modified polypropylene has been Found to reduce the severity of flow marks that occur on the surface of injection molded articles.

Reduction of flow marks in rubber modified polypropylene

This invention relates to syndiotactic polypropylene having greater than 55% racemic dyads having elastic characteristics at room or ambient temperature, a method for producing said syndiotactic polypropylene and articles made therefrom.

Syndiotactic polypropylene, methods for producing amorphous syndiotactic

This invention relates to a ternary blend of 20 to 50 wt. % of random propylene copolymer of approximately 2% ethylene, 10 to 40 wt. % ethylene/propylene rubber, and 20 to 50 wt. % high density polyethylene for use as a molded article.

Thermoplastic olefins with low viscosity

Syndiotactic polypropylene fibers from syndiotactic polypropylene having a melting point of from 100.degree. C. to 160.degree. C. and desirably a polymer having blocks of repeating racemic dyads connected predominantly by units having a meso triad or a meso dyad and methods of making such fibers. Fabrics, yarns and tows made from these fibers are useful in the production of diapers, hospital gowns, and the like.

Growing community of inventors

Houston, TX, United States of America

Andrew J Peacock