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US 6,184,327 B2Granted
Elastomeric propylene polymers
AssigneeExxon Chemical Patents Inc.
InventorsWeiqing Weng, Armen H. Dekmezian, Eric J. Markel, David L. Peters
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AssigneeExxon Chemical Patents Inc.
InventorsWeiqing Weng, Armen H. Dekmezian, Eric J. Markel, David L. Peters
Estimating the term…
A thermoplastic elastomer is provided comprising a branched olefin polymer having crystalline sidechains and an amorphous backbone wherein at least 90 mole percent of the sidechains are isotactic or syndiotactic polypropylene and at least 80 mole percent of the backbone is atactic polypropylene. Additionally, a process is provided for producing a thermoplastic elastomer composition comprising: a) contacting, in solution, at a temperature from about 90° C. to about 120° C., propylene monomers with a catalyst composition comprising a chiral, stereorigid transition metal catalyst compound capable of producing isotactic or syndiotactic polypropylene; b) copolymerizing the product of a) with propylene and, optionally, one or more copolymerizable monomers, in a polymerization reactor using an achiral transition metal catalyst capable of producing atactic polypropylene; and c) recovering a branched olefin polymer.
A thermoplastic elastomer composition comprising a branched olefin polymer having crystalline sidechains and an amorphous backbone wherein said sidechains are at least 90 mole percent isotactic or syndiotactic polypropylene and said backbone is at least 80 mole percent atactic polypropylene.
A thermoplastic elastomer composition comprising a branched olefin polymer having crystalline sidechains and an amorphous backbone,
A thermoplastic elastomer composition comprising a branched olefin polymer having crystalline sidechains and an amorphous backbone wherein the sidechains are composed of propylene units and, optionally, one or more comonomer units, wherein the sidechains are at least 90 mole percent isotactic or syndiotactic polypropylene, and wherein the backbone is composed of propylene units and, optionally, one or more comonomer units and wherein the backbone is at least 80 mole percent atactic polypropylene.
A thermoplastic elastomer composition comprising
Dependencies are inferred from the claim text.