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
2001-09-26
2003-11-25
Wu, David W. (Department: 1713)
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...
C524S247000, C524S249000, C524S492000, C524S502000, C524S571000
Reexamination Certificate
active
06653387
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to a conjugated diene-based rubber composition reinforced with particulate alumina in combination with a non-silane coupling agent as a high purity tetrathiodipropionic acid and/or trithiodipropionic acid. The invention includes an article of manufacture, including a tire, having at least one component comprised of such rubber composition.
BACKGROUND FOR THE INVENTION
For various applications utilizing rubber compositions, carbon black and/or synthetic amorphous silica-based materials are conventionally used as particulate reinforcing fillers for the elastomer(s) of the rubber composition(s).
Often an organosilane-based coupling agent such as, for example, an organoalkoxysilane-based polysulfide coupling agent is used together with precipitated silica or with alumina in order to couple, or otherwise enhance, its elastomer reinforcement effect for the elastomer(s) and such use of a coupling agent is well known to those having skill in such art (e.g. a bis(3-triethoxysilylpropyl)polysulfide having an average of from 2 to 2.6 or from 3.5 to 4 connecting sulfur atoms in its polysulfidic bridge.
However, use of such alkoxysilane-based silane coupling agent normally results in a release of an alcohol (e.g. ethanol), as a byproduct, by reaction of the alkoxy groups of the silane with hydroxyl groups contained on the surface of aggregates of synthetic precipitated silica, particularly during a rubber mixing process where rubber, precipitated silica and such type of coupling agent are mixed together.
For various purposes, it may be desired to reduce or substantially eliminate, or even entirely eliminate such alcohol evolution while mixing with various rubber compositions.
It is also appreciated that particulate alumina, particularly a natural occurring alumina such as, for example, Boehmite alumina as an aluminum oxide hydroxide comprised of the general formula: Al
2
O
3
·xH
2
O, has heretofore been proposed for blending with various rubber compositions where the “x” indicates that water of hydration is contained on or with the aluminum oxide in an amount of “x” units of water which can vary significantly such as for example only, from one to perhaps three or more units of water. Such water of association is well known to those having skill in such art. It is considered herein that such alumina contains hydroxyl groups on its surface.
In the description of this invention, the term “phr” is used to designate parts by weight of a material per 100 parts by weight of elastomer. In the further description, the terms “rubber” and “elastomer” may be used interchangeably unless otherwise mentioned. The terms “vulcanized” and “cured” may be used interchangeably, as well as “unvulcanized” or “uncured”, unless otherwise indicated.
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Causa Alfredo Guillermo
Hargis Glen
Wideman Lawson Gibson
Hu Henry S.
The Goodyear Tire & Rubber Company
Wu David W.
Young, Jr. Henry C.
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