Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Reexamination Certificate
2005-07-19
2008-12-30
Mulcahy, Peter D (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
C524S554000, C524S571000
Reexamination Certificate
active
07470743
ABSTRACT:
A crosslinkable or crosslinked rubber composition is described which includes a diene elastomer having a mass content of cyclic vinyl units of greater than 15%, and which may be used to form a tire tread. Also described is a tire tread and a tire incorporating the tread. The composition contains a linear or branched diene elastomer derived from at least one conjugated diene, and a reinforcing filler. The elastomer has cyclic vinyl units according to a mass content of greater than or equal to 15% and a number-average molecular weight of from 30,000 to 350,000 g/mol. The elastomer may be obtained by anionic polymerization of one or more monomers including a conjugated diene in an inert hydrocarbon solvent with a catalytic system including an organolithium initiator and a polar agent with several heteroatoms. The reaction may be performed batchwise where the polar agent:initiator molar ratio is greater than 8, or continuously where the polar agent:initiator molar ratio is greater than or equal to 3.
REFERENCES:
patent: 3966691 (1976-06-01), Halasa
patent: 5906956 (1999-05-01), Halasa et al.
patent: 1423442 (2004-06-01), None
patent: 03/008470 (2003-01-01), None
Luxton et al., “Observations on the preparation of polybutadiene containing vinyl cyclopentane units,”Polymer, Mar. 1981, pp. 382-386, vol. 22, IPC Business Press, Oxford, GB.
Cabioch Jean-Luc
Coissieux Laurent
Favrot Jean-Michel
Varagniat Franck
Buchanan & Ingersoll & Rooney PC
Michelin & Recherche et Technique S.A.
Mulcahy Peter D
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