Exxonmobil Chemical Patents Inc.

Exxon Chemical Patents, Inc.

Other

Enichem S.p.a

Palanisamy Arjunan

Armenag Hagop Dekmezian

Aspy Keki Mehta

Weiqing Weng

Peijun Jiang

Sunny Jacob

Pradeep P Shirodkar

Peter William Manders

Main Chang

Eric John Markel

Olivier Jean Georjon

David John Lohse

Chon-Yie Lin

Pawan Kumar Agarwal

Galen Charles Richeson

Rajan K Chudgar

James Richard Ayers

Patrick Brant

Charles C Cozewith

Bruce Alan Harrington

Donald A White

Henry W Yang

James Charles Vizzini

Yu Feng Wang

Bruce Allan Harrington

Michael C Chen

Joseph A Olkusz

Christopher R Davey

Kavilipalayam M Natarajan

Thottinal Abraham Mathew

Scott K Jackson

David Elwood

Roma B Kusznir

Simon X Zhang

Wai Yan Chow

This invention relates to the preparation of thermoplastic vulcanizates (TPVs) with unique morphological features, more specifically, this invention relates to a method for preparing TPV compositions wherein the mixing of plastomers and elastomers are carried out in solvent with curatives to induce cross-linking.

Solution blending process for preparing thermoplastic vulcanizates

A homogeneous polymer blend comprises a thermoplastic first polymer having a crystallinity of at least 30%; and a second polymer having a crystallinity of more than 5% and being at least partially cross-linked.

Homogeneous polymer blend and process of making the same

The present invention relates to a process for preparing a thermoplastic vulcanizate (TPV) comprising: contacting a thermoplastic polymer, a cross-linkable elastomer, at least one curative, and at least one cure activator in a solvent to form Composition A. The solvent is then removed, and thereafter the cross-linkable elastomer is at least partially cured. The average particle size of the cross-linkable elastomer is 10 microns or less after the solvent is removed.

Process for preparing articles

Branched crystalline polypropylene compositions and methods for the preparation of branched crystalline polypropylene compositions are provided. For example, described herein is a process of preparing a branched crystalline polypropylene composition that includes combining two or more different metallocene catalyst compounds with a polymerization medium that includes propylene, for a time sufficient to provide branched crystalline polypropylene that has from 0.0 wt % to 2.0 wt % ethylene and a heat of fusion of 70 J/g or more.

Branched crystalline polypropylene

Certain specific embodiments of the invention will now be discussed. For example, a process of preparing a copolymer composition that includes a diene-modified polypropylene copolymer is described, which process includes: contacting a metallocene catalyst compound with a polymerization medium that includes at least a propylene monomer and 2-methyl-1,5-hexadiene monomer or an &#x3b1;, internal non-conjugated diene monomer; and conducting polymerization of the monomers in the presence of the metallocene catalyst compound for a time sufficient to provide a diene-modified polypropylene random copolymer that includes monomeric units derived from each of the monomers, and having from 0.0 wt % to 2.0 wt % ethylene and a heat of fusion of 25 J/g or more.

Diene-modified propylene copolymers

Branched crystalline polypropylene compositions and methods for the preparation of branched crystalline polypropylene compositions are provided. For example, described herein is a process of preparing branched crystalline polypropylene composition that comprises contacting a supported metallocene catalyst compound with a polymerization medium that comprises propylene monomers; and conducting polymerization of the propylene monomers at a temperature greater than 70&#xb0; C. for a time sufficient to provide branched crystalline polypropylene that has from 0.0 wt % to 2.0 wt % ethylene and a heat of fusion of 70 J/g or more.

High temperature bulk polymerization of branched crystalline polypropylene

This invention relates to a process to produce propylene polymers comprising contacting a metallocene catalyst compound and an activator in a reaction medium comprising propylene, from 0 to 30 volume % of one or more solvents and from 0 to 30 mole % of one or more comonomers, under temperature and pressure conditions below the melting point of the propylene polymer and where:

Supercritical polymerization process and polymers produced therefrom

Certain specific embodiments of the invention will now be discussed. For example, a process of preparing a polymer composition that includes a branched crystalline diene-modified polypropylene random terpolymer is described, which process includes: contacting a metallocene catalyst compound with a polymerization medium that includes at least a propylene monomer, a first diene monomer, and a second diene monomer; and conducting polymerization of the monomers in the presence of the metallocene catalyst compound for a time sufficient to provide a branched crystalline diene-modified polypropylene random terpolymer that includes monomeric units derived from each of the monomers, and having from 0.0 wt % to 2.0 wt % ethylene and a heat of fusion of 30 J/g or more.

Branched diene-modified crystalline polypropylene terpolymers

A method of lowering MFR response of a high melt flow rate polymer producing metallocene catalyst is provided. The method includes contacting the metallocene catalyst with a sufficient quantity of &#x3b1;,&#x3c9;-diene monomer such that when the catalyst composition is contacted with polymerizable reactants under suitable polymerization conditions, the resulting polymer has an MFR rate in the range of 0.1 to 19. Hydrogen and ethylene may also be present in the polymerization. Additionally a catalyst composition is provided which includes a high melt flow rate polymer producing metallocene catalyst and a sufficient quantity of &#x3b1;,&#x3c9;-diene monomers such that when the catalyst composition is contacted with a monomer under polymerization conditions, the resulting polymer has an MFR rate in the range of 0.1 to 19.

Propylene diene copolymerized polymers

The co-polymerization reaction of one or more olefin monomers, such as propylene, with &#x3b1;,&#x3c9;-diene units and the resulting copolymers are provided. More specifically, the copolymer may have from 90 to 99.999 weight percent of olefins and from 0.001 to 2.000 weight percent of &#x3b1;,&#x3c9;-dienes. The copolymer may have a weight average molecular weight in the range from 50,000 to 2,000,000, a crystallization temperature in the range from 115&#xb0; C. to 135&#xb0; C. and a melt flow rate in the range from 0.1 dg/min to 100 dg/min. These copolymers may be employed in a wide variety of applications, the articles of which include, for example, films, fibers, such as spunbonded and meltblown fibers, fabrics, such as nonwoven fabrics, and molded articles. The copolymer may further include at least two crystalline populations. Desirably, the melting point range of one of the crystalline populations is distinguishable from the melting point range of another crystalline population by a temperature range of from 1&#xb0; C. to 8&#xb0; C. More desirably, one of the crystalline populations has a melting point in the range from 152&#xb0; C. to 158&#xb0; C. and another crystalline population has a melting point in the range from 142&#xb0; C. to 148&#xb0; C.

Propylene diene copolymers

The co-polymerization reaction of one or more olefin monomers, such as propylene, with &agr;,&ohgr;-diene units and the resulting copolymers are provided. More specifically, the copolymer may have from 90 to 99.999 weight percent of olefins and from 0.001 to 2.000 weight percent of &agr;,&ohgr;-dienes. The copolymer may have a weight average molecular weight in the range from 50,000 to 2,000,000, a crystallization temperature in the range from 115&deg; C. to 135&deg; C. and a melt flow rate in the range from 0.1 dg/min to 100 dg/min. These copolymers may be employed in a wide variety of applications, the articles of which include, for example, films, fibers, such as spunbonded and meltblown fibers, fabrics, such as nonwoven fabrics, and molded articles. The copolymer may further include at least two crystalline populations. Desirably, the melting point range of one of the crystalline populations is distinguishable from the melting point range of another crystalline population by a temperature range of from 1&deg; C. to 8&deg; C. More desirably, one of the crystalline populations has a melting point in the range from 152&deg; C. to 158&deg; C. and another crystalline population has a melting point in the range from 142&deg; C. to 148&deg; C.

Articles formed from propylene diene copolymers

Branched polypropylene compositions

Growing community of inventors

Houston, TX, United States of America

Palanisamy Arjunan