Appeal No. 95-4036
Application No. 08/137,332
reactor containing the dispersing medium: (1) the first block
of the dispersing agent prepared in step (a), (2) a second
monomer charge containing a second vinyl aromatic monomer and
a second conjugated diene monomer, and (3) an organolithium
polymerization initiator, and polymerizing the second monomer
charge to form:
(i) a second block of the dispersing agent, the
second block being insoluble in the dispersing medium and
linking with the first block to form the dispersing agent, and
(ii) a product copolymer comprising the second
vinyl aromatic monomer and the second conjugated diene
monomer; and
(c) continuously recovering the product copolymer and
the dispersing agent from the second polymerization reactor.
Claim 12 recites a process for preparing a styrene-butadiene
copolymer which comprises essentially the same steps as claim
1.
Discussion
Claims 1-20 are rejected under 35 U.S.C. § 103 as being
unpatentable over the combination of Markle and Gunesin. We
reverse this rejection.
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