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
2001-01-29
2003-01-28
Cain, Edward J. (Department: 1714)
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...
C524S292000, C524S306000, C524S387000, C525S331900, C152S564000, C152S905000
Reexamination Certificate
active
06512036
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to a sulfur curable (and cured) rubber composition which contains one or more pentaerythritol derivatives as pentaerythritol tetrabenzoate (PTB) and/or pentaerythritol tetrakis (3,5-di-tert-butyl4-hydroxyhydrocinnamate) (PTHC) together with a low molecular weight polyester sebacate. Such combination of materials has been observed to increase resistance to tear for a rubber composition. The invention particularly relates to a tire having a component comprised of such rubber composition.
BACKGROUND OF THE INVENTION
Rubber compositions for various components of tires are typically optimized for their physical properties. For example, for tire treads, the rubber compositions are usually optimized for traction, rolling resistance and/or treadwear.
For such components, as well as other components such as for example tire sidewall, tread base for a tire with a tread of a cap/base construction, are sometimes desired to be provided with a suitable resistance to tear, such as resistance to tear initiation.
In the description of this invention, the term “phr,” where used herein, and according to conventional practice, refers to “parts of a respective material per 100 parts by weight of rubber or elastomer”.
In the description of this invention, the terms “rubber” and “elastomer,” if used herein, may be used interchangeably, unless otherwise prescribed. The terms “rubber composition,” “compounded rubber” and “rubber compound,” if used herein, are used interchangeably to refer to “rubber which has been blended or mixed with various ingredients and materials” and such terms are well known to those having skill in the rubber mixing or rubber compounding art.
SUMMARY AND DESCRIPTION OF THE INVENTION
In accordance with this invention, a rubber composition is provided which comprises, based upon parts by weight per 100 parts by weight elastomer (phr);
(A) 100 parts by weight of at least one diene-based elastomer,
(B) about 1 to about 20, alternately about 5 to about 15 , phr of:
(1) pentaerythritol tetrabenzoate (PTB) or
(2) pentaerythritol tetrakis (3,5-di-tert-butyl4-hydroxyhydrocinnamate) (PTHC), and
(C) about 1 to about 20, alternately about 5 to about 15, phr of polyester sebacate having a molecular weight in a range of about 1000 to about 3000 so long as it has a melting point below 0° C.
In further accordance with this invention, said rubber composition is provided as a sulfur cured rubber composition.
In additional accordance with this invention, an article of manufacture is provided having at least one component comprised of such rubber composition, or sulfur cured rubber composition.
In further accordance with this invention, a tire having at least one component comprised of said rubber composition, including a sulfur cured rubber composition. Representative examples of such tire components are, for example, tire treads, particularly tire base of a tire having a tread of a cap/base construction, as well as tire sidewalls.
REFERENCES:
patent: 3617352 (1971-11-01), Shima et al.
patent: 3661623 (1972-05-01), Bhakuni et al.
patent: 5877269 (1999-03-01), Koch
patent: 0314271 (1989-05-01), None
patent: 2363124 (2001-06-01), None
Brochure “Esters for Industry” published by The C. P. Hall Company, 7300 South Central Avenue, Chicago, Illinois 60638.
Maly Neil Arthur
Wideman Lawson Gibson
Cain Edward J.
The Goodyear Tire & Rubber Company
Wyrozebski Lee Katarzyna I
Young, Jr. Henry C.
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