Process for obtaining a grafted elastomer having functional...

Details Process for obtaining a grafted elastomer having functional... Process for obtaining a grafted elastomer having functional...

2007-12-25

2007-12-25

Mulcahy, Peter D. (Department: 1713)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

C524S254000, C524S257000, C524S492000, C525S291000

Reexamination Certificate

active

11256986

ABSTRACT:
A process for obtaining a grafted diene elastomer having functional groups along the chain, a rubber composition containing this grafted elastomer and having in particular improved hysteresis properties in the cross-linked state, a preparation process for this composition, a tire tread made from this composition and a tire of reduced rolling resistance which incorporates this tread. A process for obtaining this grafted elastomer includes a radical grafting reaction carried out in solution or without a solvent by means of a reagent of the mercaptan type to graft functional groups on to the chain of a starting elastomer. The starting elastomer is treated with an antioxidant having at least one aromatic amine function before the grafting reaction, so that the grafted elastomer has a macrostructure which is practically identical to that of the starting elastomer. A rubber composition containing the grafted diene elastomer includes a reinforcing inorganic filler, and the grafted elastomer preferably has a molar ratio of units originating from conjugated dienes greater than 30%.

REFERENCES:
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Marvel C. S. et al, “Polybutadiene Modified By Addition of Thiols Containing Polar Groups”, Industrial and Engineering Chemistry, American Chemical Society, US, vol. 45, No. 9, 1953, pp. 2090-2093, XP002144506.

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