Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Reexamination Certificate
1998-07-17
2001-01-09
Robinson, Ellis (Department: 1772)
Stock material or miscellaneous articles
Hollow or container type article
Polymer or resin containing
C138S138000, C428S036900, C428S036910, C524S202000, C524S203000
Reexamination Certificate
active
06171671
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a rubber composition, a vulcanized rubber composition, and a heat-resistant rubber product (e.g., radiator hose, heater hose, or radiator packing) using the same.
2. Related Background Art
As radiator hoses, heater hoses, and radiator packing, ethylene/&agr;-olefin copolymer rubber or ethylene/&agr;-olefin/unconjugated diene copolymer rubber such as ethylene/propylene rubber (EPM) or ethylene/propylene/unconjugated diene rubber (EPDM) has conventionally been in wide use. Here, ethylene/&agr;-olefin copolymer rubber and ethylene/&agr;-olefin/unconjugated diene copolymer rubber are used as vulcanized rubber which has been vulcanized with an organic peroxide. In this case, it has been common technical knowledge that a zinc-containing compound such as zinc oxide is used as an essential component compounded in a rubber composition in order to prevent aging. When a rubber composition including a zinc-containing compound is employed as a radiator hose, heater hose, or radiator packing, however, zinc is likely to dissolve in a cooling medium, thereby affecting mechanical systems.
SUMMARY OF THE INVENTION
In view of such a problem, it is an object of the present invention to provide a rubber composition, a vulcanized rubber composition, and a heat-resistant product (e.g., radiator hose, heater hose, and radiator packing) which are mainly composed of ethylene/&agr;-olefin copolymer rubber and/or ethylene/&agr;-olefin/unconjugated diene copolymer rubber, employ no zinc-containing compound causing the above-mentioned problem, and are excellent in age resistance.
The inventors have conducted diligent studies in order to solve the above-mentioned problem and, as a result, have attained the present invention.
The rubber composition of the present invention is a rubber composition comprising:
(A) at least one copolymer ingredient selected from the group consisting of ethylene/&agr;-olefin copolymer rubber and ethylene/&agr;-olefin/unconjugated diene copolymer rubber;
(B) nickel diisobutyldithiocarbamate; and
(C) carbon black; and not containing any compound having zinc.
The vulcanized rubber composition of the present invention is a vulcanized rubber composition which is obtained by vulcanizing the above-mentioned rubber composition with an organic peroxide.
The heat-resistant rubber product of the present invention is a heat-resistant rubber product employing the above-mentioned vulcanized rubber composition. Examples of the heat-resistant rubber product include radiator hose, heater hose, and radiator packing.
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Daikai Eiichi
Ikemoto Ayumu
Nakano Sadayuki
Nolan Sandra M.
Pillsbury Madison & Sutro LLP
Robinson Ellis
Sumitomo Chemical Co.
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