Rubber composition containing silica having first and second...

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

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Details

C524S492000, C524S262000, C152S209100

Reexamination Certificate

active

06225397

ABSTRACT:

BACKGROUND OF THE INVENTION
Nanomaterials are particles having a size of from 1 to 30 nanometers in diameter. Use of nanomaterials have been known in rubber. For example, in U.S. Pat. No. 4,644,988, there is disclosed a tire tread compound containing a styrene-butadiene copolymer rubber reinforced with a high structure carbon black designated as N103 and a particle size smaller than 20 nanometers. In addition, it is known from U.S. Pat. No. 4,474,908 that siliceous fillers having an ultimate particle size in the range of from 15 to 30 nanometers have been used in rubber. One advantage in using such nanomaterials in rubber is to improve the treadwear. Unfortunately, upon mixing nanomaterials in a rubber composition, such nanomaterials tend to reagglomerate and, therefore, increase the individual particle sizes which result in decreasing the benefits for which they are added. In addition, with increasing levels of nanomaterials in place of larger particles (>100 nanometers in diameter), the rubber becomes more hysteretic.
Japanese Unexamined Patent 8-133720 discloses a production method of precipitated silica granulate involving (a) mixing 100 percent of precipitated silica powder, in which a mean particle size is more than 60 &mgr;m and a particle hardness is 10-30 g, with 5 to 30 percent of precipitated silica powder, in which a mean particle size is less than 20 &mgr;m, and (b) granulating.
SUMMARY OF THE INVENTION
The present invention relates to rubber compositions containing precipitated silica having two different aggregates each containing distinct particle sizes and where the pore size distribution of the silica, as measured by mercury porosimetry is monomodal.


REFERENCES:
patent: 5753732 (1998-05-01), Wideman et al.
“Influence of Precipitated Silica Characteristics on the Properties of a Truck Tyre Tread, II” by Y. Bomal et al.KGK Kautschuk Gummi Kunststoffe,vol. 51, No. 4 Published Apr. 1998, pp. 259-267.
“Reinforcement of EPDM-based ionic Thermoplastic elastomer by precipitated silica filler” by S. Datta et al.Polymer,vol. 37, No. 17, Published 1996, pp. 2581-2585.
“Die Einwirking gefällter Kieselsäure auf die Messing/Gummi-Hafting” by L. R. Evans et al.Gawk Gummi Fares Kunststoffe 2,vol. 49, No. 1, Published 1996.
“Ultra-High reinforcing Precipitated Silica for Tire and rubber Applications” by L. R. Evans, et al.KGK Kautschuk Gummi Kunststoffe,vol. 48, No. 10, Published Oct. 1995, pp. 718-723.
“The Unique Properties of Precipitated Silica in the Design of High Performance Rubber” by M. Q. Fetterman,ElastomericsPublished Sept. 1984, pp. 18-31.
European Patent Search Report.

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