Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Reexamination Certificate
2007-03-20
2007-03-20
Wu, David W. (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
C526S336000, C526S339000, C526S172000
Reexamination Certificate
active
10481064
ABSTRACT:
A polymer comprising units (1) derived from an alpha-olefin having at least 3 carbon atoms (1′), units (2) derived from divinylbenzene or C1-10hydrocarbyl substituted derivatives thereof (2′), and units (3) derived from ethylene (3′), the polymer comprising at least 75 mole % of units (1), from 0.01 to 5 mole % of units (2), and up to 20 mole % of units (3), the polymer having a branching factor BF 0.75. A process for preparing a polymer comprising units (1) derived from an alpha-olefin having at least 3 carbon atoms (1′), units (2) derived from divinylbenzene or C1-10hydrocarbyl substituted derivatives thereof (2′), and units (3) derived from ethylene (3′), by contacting the alpha-olefin (1′), the divinylbenzene compound (2′), and ethylene (3′) in the presence of a polymerisation catalyst under polymerisation conditions wherein the mole ratio of alpha-olefin (1′) to divinylbenzene or C1-10hydrocarbyl substituted derivatives thereof (2′) is at least 10:1, the mole ratio of divinylbenzene or C1-10hydrocarbyl substituted derivatives thereof (2′) to ethylene (3′) is in the range of from 1:0.1 to 1:2000, and the mole ratio of (1′) to (3′) is at least 4:1.
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Arriola Daniel J
Devore David D.
Redwine Oscar D.
Timmers Francis J.
Dow Global Technology Inc.
Lee Rip A
Wu David W.
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