Appeal No. 95-3976
Application 08/164,733
Reference of Record
The following reference of record is relied upon by the examiner in support of the rejection of the
claims:
Eckert 4,156,673 May 29, 1979
The Rejection
Claims 15-20 stand rejected under 35 U.S.C. § 102(b) as being anticipated by, or in the
alternative, under 35 U.S.C. § 103 as obvious over Eckert.
Opinion
We have carefully considered the respective positions advanced by appellants and the examiner.
For the reasons set forth below, we will sustain the examiner's rejection.
Claim 15 is directed to a process for improving the viscosity index of oils. The process comprises
sequentially (i) polymerizing styrene, isoprene and a polyalkenyl coupling agent such as a
polydivinylbenzene to form a star polymer having the formula (A-B) )X to form living block copolymer
n
molecules, wherein A is a block of polystyrene, B is a block of polyisoprene, X is the polyalkenyl coupling
agent, and n is the number of block copolymer arms in the star polymer when coupled with 2.5 or more
moles of the polyalkenyl coupling agent per mole of living block copolymer molecules; (ii) recovering the
-3-
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