Leland Stanford Junior University

Borg-warner Chemicals, Inc.

Borgwarner Inc.

Amoco Corporation

Bp Corporation North America Inc.

Charles L Myers

Eric J Moore

Roger W Quan

Andreas B Ernst

Robert M Waymouth

Raisa L Kravchenko

Larry L Bendig

Charles F Parsons

Edward E Paschke

Gary T Brooks

Thomas S Grant

Michael K Rinehart

Glenn P Desio

William Steffancin

Gerald Goldberg

Curtis M Miller

Brian L Joss

A metallocene catalyst system component for polymerization of olefins includes at least one 2-arylindenyl ligand substituted on the 1-position by a substituted or unsubstituted alkyl, alkylsilyl, or aryl substituent of 1 to 30 carbon atoms.

Catalyst systems for high melting thermoplastic elastomeric &#x3b1;-olefin polymers and plastomers

This invention relates generally to low ethylene insertions into I-olefin polymers and processes for production of such polymers using unbridged fluxional metallocenes, primarily substituted aryl indenyl metallocenes, and more particularly to use of unbridged, fluxional, cyclopentadienyl or indenyl metallocene catalyst systems in methods of production of high melting point I-olefin homo- and co-polymers, particularly elastomeric crystalline and amorphous block homo- and co-polymers of I-olefins. The activity of fluxional unbridged metallocene polymerization catalysts containing at least one 2-arylindene ligand is increased 10&times; or more by the addition of small (typically 0.1-10 wt. %) amounts of ethylene to the polymerization system, which increase is termed the Polymerization Rate-Enhancement effect (PRE), which is measured in terms of an Ethylene Enhancement Factor (EEF) as a dimensionless ratio in the range of from about 1.1 to about 10 or above. The amount of ethylene included in the reaction system can be selected and controlled to be so small as to result in essentially minimal (<2 mole %) incorporation of ethylene units into the resulting elastomeric polymer and the molecular weight may be increased. Amounts of ethylene to generate the PRE effect may be greater than 0.1 wt. % and preferably range up to about 2 wt. %. However, if a polymer with more ethylene is desired, additional ethylene may be incorporated into the polymerization feed, including up to 10 to about 50 mole % based on olefin units. A second important aspect of this invention is the ability to use a PRE activity-enhancing amount of ethylene in an olefin polymerization without substantially affecting the physical properties of the elastomer. In a third important aspect of this invention, I-olefin elastomers are produced through incorporation of ethylene using unbridged fluxional catalyst systems which may not otherwise produce acceptable elastomeric homopolymers. This effect is termed the EPE effect, for Elastomeric Property-Enhancing effect. The EPE amount of ethylene required to produce such elastomers typically overlaps the PRE activity-enhancing amount. Incorporation of up to about 5 mole % or more of ethylene typically will produce an elastomeric polymer using such catalyst systems. Typical useful amounts of incorporated ethylene include about 1 to 3 mole %. Preferred polymers of this invention retain sufficient crystallinity to provide a high melting point (by DSC) of about 80&deg; C., preferably above 100&deg; C., including in the range of from about 120&deg; C. to about 140&deg; C. and above. Novel flexible &agr;-olefin homo and copolymers having elongation in excess of 600% and substantially no retained force are disclosed.

High melting thermoplastic elastomeric alpha-olefin polymers (PRE/EPE effect) and catalysts therefor

Fluxional catalysts and related ligands containing bulky substituents

This invention relates generally to low ethylene insertions into .alpha.-olefin polymers and processes for production of such polymers using unbridged fluxional metallocenes, primarily substituted aryl indenyl metallocenes, and more particularly to use of unbridged, fluxional, cyclopentadienyl or indenyl metallocene catalyst systems in methods of production of high melting point .alpha.-olefin homo- and co-polymers, particularly elastomeric crystalline and amorphous block homo- and co-polymers of .alpha.-olefins. The activity of fluxional unbridged metallocene polymerization catalysts containing at least one 2-arylindene ligand is increased 10.times. or more by the addition of small (typically 0.1-10 wt. %) amounts of ethylene to the polymerization system, which increase is termed the Polymerization Rate-Enhancement effect (PRE), which is measured in terms of an Ethylene Enhancement Factor (EEF) as a dimensionless ratio in the range of from about 1.1 to about 10 or above. A second important aspect of this invention is the ability to use a PRE activity-enhancing amount of ethylene in an olefin polymerization without substantially affecting the physical properties of the elastomer. In a third important aspect of this invention, .alpha.-olefin elastomers are produced through incorporation of ethylene using unbridged fluxional catalyst systems which may not otherwise produce acceptable elastomeric homopolymers. Preferred polymers of this invention retain sufficient crystallinity to provide a high melting point (by DSC) of about 80.degree. C., preferably above 100.degree. C., including in the range of from about 120.degree. C. to about 140.degree. C. and above. Novel flexible .alpha.-olefin homo and copolymers having elongation in excess of 600% and substantially no retained force are disclosed.

Ethylene enhancement of processes for synthesis of high melting

Neat and filled polyphthalamide resins are improved in processability when blended with polypropylene and a carboxylated polyolefin resin. Filled polyphthalamides, particularly glass-filled polyphthalamide formulations, are significantly benefited, and glass fiber-filled molding resin formulations of this invention comprising high levels of fiber are more readily moldable than polyphthalamide formulations without the polyolefin components comprising the same and even lower levels of glass-fiber.

Filled polyphthalamide blends having improved processability and

Polypropylene resins are improved in mechanical properties and in rigidity without loss in thermal processability when blended with polyphthalamide resins together with a minor amount of a carboxylated polyolefin compatibilizing aid. Filled compositions, including glass-filled polypropylenes are similarly benefited when blended with a polyphthalamide and a carboxylated polyolefin compatibilizing aid.

Polypropylene-polyphthalamide blends

A method for producing a high molecular weight polystyrene comprises polymerizing styrene monomer and from about 0.01 to about 2.0 parts by weight per 100 parts by weight total monomer of a polyfunctional monomer in an emulsion polymerization medium. Preferred polyfunctional monomers include allyl groups, vinyl groups or mixtures thereof, and the resultant high molecular polystyrene preferably has a weight average molecular weight, Mw, greater than about 400,000.

High molecular weight polystyrene and method

A thermoplastic molding composition is provided wherein the composition comprises an ABS copolymer, a copolymer of an unsaturated dicarboxylic acid anhydride, and a minor portion of an alkylene oxide copolymer.

Thermoplastic molding compositions

Styrenic resins having incorporated therein from 0.5 to 15 pbw of a copolymerizable, ethlenically unsaturated carbonamide such as acrylamide form alloys with polyamides which exhibit improved compatibility, higher heat distortion temperatures and improved Izod impact values over the range of from 5 to 95 wt. % polyamide and 95 to 5 wt. % modified styrenic resin. The alloys may further include unmodified styrenic resins, as well as conventional stabilizers, fillers and the like.

Alloys of styrenic resins and polyamides

A metal platable high heat ABS resin containing alkyl substituted silicone polymers and, optionally, up to 35% by weight of a bis-phenol polycarbonate and plated parts made therefrom.

Platable high heat ABS resins and plated articles made therefrom

Thermoplastic copolymers and graft polymers containing from 1 to 15% by weight of a copolymerized salt of an ethylenically unsaturated vinyl sulfonic acid which exhibit improved heat distortion temperature properties while retaining excellent melt processing characteristics, and a method for their preparation.

Growing community of inventors

Palatine, IL, United States of America

Charles L Myers