Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Reexamination Certificate
2005-02-22
2005-02-22
Teskin, Fred (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
C526S182000, C525S333300, C525S359500
Reexamination Certificate
active
06858683
ABSTRACT:
Process for the production of statistic elastomeric conjugated diene-vinyl arene copolymers having a branched structure which comprises: (1) anionic copolymerization in solution of the conjugated diene and vinyl arene monomers, in the presence of randomizing agents and an initiator selected from the group of Lithium alkyls, the copolymerization being carried out until the almost total disappearance of the monomers; (2) addition to the solution of step (1) of a quantity of Lithium alkyl from 1 to 4 times the molar quantity of the Lithium alkyl of step (1); (3) addition to the polymeric solution of step (2) of a compound having the general formula R—Br, the molar ratio between R—Br and the total Lithium alkyl ranging from 0.6/1 to 1/1, preferably from 0.7/1 to 0.9/1, thus obtaining an elastomeric branched copolymer.
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patent: 5914378 (1999-06-01), Viola et al.
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Basic Principles of Organic Chemistry, Roberts and Caserio, W.A. Benjamin, Inc., N.Y., pp. 63-66, 1964.*
U.S. Appl. No. 09/431,223, filed Nov. 1, 1999, Viola et al.
U.S. Appl. No. 10/257,395, filed Oct. 18, 2002, Viola et al.
Isidori Sabrina
Masi Francesco
Soddu Luca
Taccioli Attilio
Viola Gian Tommaso
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Polimeri Europa S.p.A.
Teskin Fred
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