Rubber compositions with activated sulfur cure

Details Rubber compositions with activated sulfur cure Rubber compositions with activated sulfur cure

2007-07-12

2010-10-19

Harlan, Robert 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...

C524S570000

Reexamination Certificate

active

07816443

ABSTRACT:
Cured rubber compositions with reduced divalent metal levels and improved physical properties are prepared using methods that limit or avoid a deleterious side reaction, and that make activator compounds available only during cure and not earlier during mixing. Specifically, the presence of activator soap (or of components that can form the activator soap in situ) and silica filler together is avoided or minimized in process steps where the temperature would tend to be above 100° C. or 110° C. The use of ZnO for example can be reduced by as much as 90˜95% in a typical rubber compound.

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Heideman, Geert et al., “Various routes for reduction of zinc oxide levels in rubber compounds”, Tire Technology International 2004, pp. 22-27.

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