Patents Represented by Attorney Harvey Cohen

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  • Para-alkylstyrene/isoolefin copolymers having substantially homogeneous compositional distribution
    Patent number: 5430118
    Abstract: A copolymer having a substantially homogeneous composition distribution, said copolymer comprising the direct reaction product of an isoolefin and para-alkylstrene.
    Type: Grant
    Filed: January 14, 1994
    Date of Patent: July 4, 1995
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Kenneth W. Powers, Hsien-Chang Wang
  • Para-alkylstyrene/isoolefin copolymers having substantially homogeneous compositional distribution
    Patent number: 5426167
    Abstract: A copolymer having a substantially homogeneous composition distribution, said copolymer comprising the direct reaction product of an isoolefin and para-alkylstyrene.
    Type: Grant
    Filed: January 14, 1994
    Date of Patent: June 20, 1995
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Kenneth W. Powers, Hsien-Chang Wang
  • Immobilized Lewis acid catalysts
    Patent number: 5409873
    Abstract: Immobilized Lewis Acid catalyst comprising polymer having at least one Lewis Acid immobilized within the structure therein, said polymer having monomer units represented by the structural formula:--[A].sub.a --[B].sub.b --[C].sub.c --whereina represents about 1 to about 99 mole %b represents about 0 to about 50 mole %c represents about 1 to about 99 mole %a+b+c is preferably about 100 %; ##STR1## C is selected from the group consisting of: ##STR2## and, (III) combinations thereof, whereinD is OH, halide, OR.sup.4, NH.sub.2, NHR.sup.3, OM', or OM";E is the residue of the reaction of at least one Lewis Acid with the D substituent of monomer unit B.
    Type: Grant
    Filed: June 26, 1992
    Date of Patent: April 25, 1995
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Tze-Chiang Chung, Frank J.-Y. Chen, Jon E. Stanat, Alok Kumar