Thermoplastic elastomers having improved low temperature...

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...

Reexamination Certificate

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Details

C525S237000, C525S240000, C525S242000, C525S194000, C525S088000

Reexamination Certificate

active

06939918

ABSTRACT:
The present invention provides a thermoplastic vulcanizate prepared by a process comprising the steps of dynamically vulcanizing rubber within a blend that includes the rubber and a thermoplastic resin, where the rubber comprises an elastomeric copolymer of ethylene, at least one α-olefin, and optionally one or more diene monomers, where the elastomeric copolymer is characterized by having a crystallinity, as measured by differential scanning calorimetry, of less than 10 J/g, an ethylene content that is less than 90 mole percent based upon the entire copolymer, a weight average molecular weight that is greater than about 20,000 as measured by GPC with polystyrene standards, a molecular weight distribution that is less than 7, and an ethylene compositional distribution that is less than about 4 percent for the closest 90 percent of fractioned samples.

REFERENCES:
patent: 4130535 (1978-12-01), Coran et al.
patent: 4843129 (1989-06-01), Spenadel et al.
patent: 4985502 (1991-01-01), Izumi et al.
patent: WO 97 36741 (1997-10-01), None

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