Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Reexamination Certificate
2003-09-30
2008-03-04
Mulcahy, Peter D. (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C524S401000, C524S524000, C525S240000
Reexamination Certificate
active
07338994
ABSTRACT:
Rheology-modified, gel-free thermoplastic elastomer compositions comprising a melt blend of an ethylene/α-olefin polymer and a high melting polymer such as polypropylene or a propylene/α-olefin copolymer wherein the rheology modification is induced by a combination of a peroxide and a free radical coagent in a peroxide:coagent ratio of 1:4 to 1:20 and a maximum peroxide concentration of 0.075 wt %. The resulting compositions have an elastomeric phase, a non-elastomeric phase and certain physical properties that exceed those of a like composition that is rheology-modified by peroxide alone or peroxide and coagent in a 1:2 to 2:1 ratio. The compositions are used to make a variety of articles of manufacture, such as tubing and weatherstripping, via calendaring, extrusion, and molding techniques such as blow molding.
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Walton Kim Louis
Weaver Laura Bauerle
Dow Global Technologies Inc.
Mulcahy Peter D.
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