Appeal No. 1996-1284
Application No. 08/084,685
polymerized with a lithium initiator, the improvement
comprising polymerizing at least 5% by weight of the monomers
in a non-polar solvent prior to addition of a sufficient
amount of tetramethylethylenediamine to achieve 1,2-addition
of at least 60%, and then slowly adding the remaining portion
of the monomers to maintain a reaction temperature from 10EC
to 40EC.
The examiner relies upon the following references as
evidence of obviousness:
Hall 4,429,091Jan. 31, 1984
Phillips Petroleum 884,490 Dec. 13, 1961
(GB '490)1
Van Amerongen et al. 1,283,327 Jul. 26, 1972
(Van Amerongen)2
Appealed claims 1-3 stand rejected under 35 U.S.C. § 103
as being unpatentable over Van Amerongen and GB '490 in view
of Hall.
Appellant's claimed invention is directed to a process
for preparing a random copolymer of a conjugated diene and a
vinyl aromatic compound, such as styrene. The process entails
employing tetramethylethylenediamine as a modifier in the
reaction process.
1(Great Britain patent specification)
2(Great Britain patent specification)
-2-
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