Elastomer composites, blends and methods for preparing same
AssigneeCabot Corporation
InventorsGerald D. Adler, Anand Prakash, Ralph E. Dickinson, Vijay R. Tirumala
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Abstract
Blends of elastomer composites with unfilled or less highly filled elastomer reduces hysteresis without compromising reinforcement. Hysteresis may also be reduced by adjusting the compounding method.
Claims24
A process for producing an elastomeric composition containing a filler, the process comprising:
- preparing an elastomer composite comprising natural rubber and a first filler loading of carbonaceous aggregated filler having an STSA of at least 120 m2/g, the first filler loading being greater than 55 phr, by a wet masterbatch method;
- and
- blending the elastomer composite with a second elastomer material comprising an elastomer and optional particulate filler to produce an elastomer composite blend having a second filler loading, the second filler loading being at least about 5 phr lower than the first filler loading, wherein M300/M100 of a vulcanizate of the elastomer composite blend is at least 0.5 higher than M300/M100 for a vulcanized elastomer composite of the same composition but prepared according to CTV Comparative Method 1.
A vulcanizate of an elastomer composite blend mixed with a curative package and exhibiting a ratio M300/M100 of α, the elastomer composite blend comprising a mixture of a wet mix elastomer composite and a second rubber comprising natural rubber, the wet mix elastomer composite comprising a carbonaceous aggregated particulate filler in an amount of X phr, X being at least 55, wherein
- the vulcanizate has a filler loading of Y phr, Y being at least 5 phr less than X, and
- the ratio M300/M100 of a vulcanized wet mix elastomer composite produced without the second rubber but having the same composition as the vulcanizate of the elastomer composite blend is less or equal to α.
A vulcanizate of an elastomer composite blend mixed with a curative package and exhibiting tan delta 60 of Z, the elastomer composite blend comprising a mixture of a wet mix elastomer composite and a second rubber comprising natural rubber, the wet mix elastomer composite comprising a carbonaceous aggregated particulate filler in an amount of X phr, X being at least 55, wherein
- the vulcanizate has a filler loading of Y phr, Y being at least 5 phr less than X, and
- the value of tan delta 60 of a vulcanized wet mix elastomer composite produced without the second rubber but having the same composition as the vulcanizate of the elastomer composite blend is greater than or equal to Z.
A process for producing an elastomeric composition containing a filler, the process comprising:
- preparing an elastomer composite comprising natural rubber and a first filler loading of carbonaceous aggregated filler, the first filler loading being greater than 55 phr, by a wet masterbatch method;
- and
- blending the elastomer composite with a second elastomer material comprising natural rubber and optional particulate filler to produce an elastomer composite blend having a second filler loading, the second filler loading being at least about 5 phr lower than the first filler loading, wherein M300/M100 of a vulcanizate of the elastomer composite blend is at least 0.5 higher than M300/M100 for a vulcanized elastomer composite of the same composition but prepared according to CTV Comparative Method 1.
Dependencies are inferred from the claim text.