Other

Exxonmobil Chemical Patents Inc.

Advanced Elastomer Systems, L.p.

Monsanto Company

Kuo-Shein Shen

Robert E Medsker

Tonson Abraham

Sabet Abdou-Sabet

Norman Glenn Barber

Gary W Gilbertson

Edward John Blok

Periagaram Srinivasan Ravishankar

Donald R Hazelton

Jianya Cheng

Krishna Venkataswamy

Ronald DeYoung

Donald S Wang

Kang-Bo Wang

Hari Prasad Nadella

Jianqun Zhao

Craig Allen Chmielewski

Ronald De Young

Ronald L Hazelton

Harry P Nadella

Provided in one aspect is a method of melt blending comprising providing an extruder possessing addition points from a zero point to a 100 point the length of the extruder; adding at least one thermoplastic and at least one curable polymer at the zero to 10 point of the extruder; adding at least one silicone hydride at the 5 to 30 point of the extruder; adding at least one metal catalyst at the 20 to 60 point of the extruder, with the proviso that the metal catalyst is added at least 5 points farther down the extruder than the silicone hydride. Provided in another aspect is a hydrosilylation curative composition comprising a silicone hydride having the formula wherein H is hydrogen, and each R' is independently selected from hydrogen and Cto Calkyl groups; R&#x2033; is selected from Cto Calkyl groups; n is an integer from 5 to 45; and m is an integer from 5 to 45.

Method of melt blending curable polymer compositions using silicone hydrides

The invention relates to a method of preparing a thermoplastic vulcanizate comprising: a) melt processing a blend of thermoplastic polymer and vulcanizable elastomer in a multi-screw extruder having at least three intermeshing screws, wherein said screws have 3-170 mixing zones, and said extruder having a L/D ratio of 15-100, and a screw profile that has 3 to 17 meshes per L/D; b) adding at least one curing agent to the melt-processed blend of a) in at least one location in the first 46% of the length of said extruder, or adding at least one curing agent to the melt-processed blend of a) in a second extruder, so as to initiate curing of the blend: and, curing at least partially said elastomer by reactive melt processing. Improved processing, reaction kinetics and efficiencies are achieved, as well as thermoplastic vulcanizate products having decreased weight gain when placed in mineral oils.

Preparation of thermoplastic elastomers by dynamic vulcanization in multi-screw extruders

This invention relates to a soft thermoplastic vulcanizate composition comprising: a) from about 2-10 wt %, based upon total polymer content weight a)+b)+c), of a thermoplastic polyethylene or polypropylene homopolymer, or ethylene-propylene copolymer, or copolymer that includes ethylene or propylene together with one or more Cto C&#x3b1;-olefins, said thermoplastic having at least 25% crystallinity by DSC; b) from about 15 to about 36 wt. %, based upon total polymer content weight a)+b)+c), of an ethylene-&#x3b1;-olefin random or block copolymer thermoplastic having less than 5% crystallinity by DSC; c) from about 60 to about 80 wt. %, based upon total polymer content weight a)+b)+c), of a cross-linked elastomer; and d) from about 50 to about 65 wt %, based upon total composition weight a)+b)+c)+d), of a process oil; wherein said thermoplastic vulcanizate composition has a Shore A Hardness of less than 35. The invention compositions may also comprise from about 0 to about 40 wt. %, based upon the total composition weight, of conventional additives.

Soft thermoplastic elastomers

In the preparation of thermoplastic elastomers by hydrosilylation crosslinking of the elastomeric component, the use of an elastomer containing a non-conjugated diene and having a Mooney viscosity within the MST range of 45 to 100 provides products with a high level of crosslinking and an improved combination of physical properties. This improvement is obtained even at low concentrations of hydrosilylation catalyst.

Hydrosilylation crosslinking of thermoplastic elastomer

An improved process for the preparation of thermoplastic elastomers by hydrosilylation crosslinking, in which a hydrosilylation crosslinking agent with a low degree of polymerization and/or a hydrosilylation crosslinking agent diluted in oil is used.

Preferred process for silicon hydride addition and preferred degree of

Processes for the preparation of a thermoplastic elastomer comprising a triblend of engineering resin, dynamically vulcanized alloy of thermoplastic olefin polymer and elastomeric copolymer, and a compatibilizer for the engineering resin and alloy. The compatibilizer can be formed in a separate step or in-situ in a one step process. The processes produce compositions which retain structural integrity at high temperature, and have good tensile properties, elongation and fluid resistance.

Processes for producing thermoplastic elastomers having improved

A process is described for the preparation of thermoplastic elastomers comprising a blend of plastic and cured rubber by dynamic vulcanization wherein the blend is subjected to high shear.

Process for the preparation of thermoplastic elastomers

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Akron, OH, United States of America

Kuo-Shein Shen