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
2000-07-28
2003-02-11
Yoon, Tae H. (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...
C524S495000, C524S262000, C524S114000, C525S332900
Reexamination Certificate
active
06518350
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a rubber composition with excellent workability that gives vulcanized products with high wet skid resistance, low rolling resistance and excellent abrasion resistance, and to a tire possessing treads produced from the rubber composition.
2. Description of the Prior Art
Recent requirements for lower fuel consumption by automobiles have led to demand for tire rubber materials that provide reduced tire rolling resistance. Tire rolling resistance can be reduced by lowering the low frequency energy loss of vulcanized rubber; tan &dgr; at 60° C. is used as the evaluation index for vulcanized rubber, and starting rubber preferably has a small tan &dgr; at 60° C.
Demands for running stability have made it highly desirable to provide starting rubber with high frictional resistance on wet surfaces (wet grip) and high frictional resistance on dry surfaces (dry grip). In order to increase the frictional resistance of tires on wet surfaces it is sufficient to increase the high frequency energy loss of vulcanized rubber; here, tan &dgr; at 0° C. is used as the evaluation index for vulcanized rubber, and the starting rubber preferably has a large tan &dgr; at 0° C.
However, the low rolling resistance and high frictional resistance on wet surfaces are in an antimonious relationship, and it has been very difficult to achieve both. The use of rubber compositions containing silica as a reinforcer instead of carbon black has been proposed in the past. Examples include rubber compositions comprising styrene-butadiene copolymer, vinylpolybutadiene and mixtures of silica and carbon black (Japanese Laid-open Patent Publication No. 252433 of 1991, No. 183868 of 1997, and the like.).
These methods, however, require the use of large amounts of expensive silane coupling agents in order to achieve an adequate effect, the mixing temperature must be controlled to no higher than 150-160° C., and the workability of the compounded rubber prior to vulcanization is poorer.
SUMMARY OF THE INVENTION
Problems to be Solved by the Invention
It is an object of the present invention to provide a rubber composition with no mixing temperature problem and excellent workability prior to vulcanization, and which gives vulcanized products with high wet resistance and that satisfy both the required low rolling resistance and abrasion resistance.
It is another object of the invention to provide a tire with high wet skid resistance, low rolling resistance and excellent abrasion resistance.
Features of the Invention
According to the invention, the aforementioned objects are achieved by providing a rubber composition and tire with the composition described below.
[1] A rubber composition comprising a diene-based rubber (a), silica (b) at 5-100 parts by weight to 100 parts by weight of said diene-based rubber (a) and a compatibilizer (c) at 0.1-20 parts by weight to 100 parts by weight of said silica (b), characterized in that said compatibilizer (c) is at least one selected from among:
(I) Aminosilane compounds;
(II) Epoxy group-containing compounds;
(III) Compounds with an amino group and a hydroxyl group, an amino group and an epoxy group, an amino group and an ether, bond, an amino group and a carboxyl group, an amino group and an ester bond or an amino group and a polymerizable unsaturated bond in the molecule; and
(IV) Compounds with a polymerizable unsaturated bond and a hydroxyl group, a polymerizable unsaturated bond and an epoxy group, a polymerizable unsaturated bond and an ether bond, a polymerizable unsaturated bond and a carboxyl group or a polymerizable unsaturated bond and an ester bond in the molecule.
[2] A rubber composition comprising a diene-based rubber (a), silica (b) at 5-100 parts by weight to 100 parts by weight of said diene-based rubber (a) and a compatibilizer (c) at 0.1-20 parts by weight to 100 parts by weight of said silica (b), wherein said diene-based rubber (a) contains styrene-butadiene copolymer rubber at 30-100 wt % with respect to said diene-based rubber (a), and
said styrene-butadiene copolymer rubber has
(i) a styrene component content of 5-45 wt %;
(ii) a butadiene 1,2-bond content of 10-80 wt %;
(iii) a glass transition temperature of −70 to −10° C.; and
(iv) an amino group content of 0.01-2.0 mmol per 100 g of said copolymer rubber, and
said compatibilizer (c) is at least one selected from among:
(I) Aminosilane compounds;
(II) Epoxy group-containing compounds;
(III) Compounds with an amino group and a hydroxyl group, an amino group and an epoxy group, an amino group and an ether bond, an amino group and a carboxyl group, an amino group and an ester bond or an amino group and a polymerizable unsaturated bond in the molecule;
(IV) Compounds with a polymerizable unsaturated bond and a hydroxyl group, a polymerizable unsaturated bond and an epoxy group, a polymerizable unsaturated bond and an ether bond, a polymerizable unsaturated bond and a carboxyl group or a polymerizable unsaturated bond and an ester bond in the molecule; and
(V) Ether bond-containing compounds.
[3] A rubber composition according to [2] above, wherein said compatibilizer (c) is at least one selected from among compounds of (I), (II), (III) and (IV) above.
[4] A rubber composition comprising a diene-based rubber (a), silica (b) at 5-100 parts by weight to 100 parts by weight of said diene-based rubber (a) and a compatibilizer (c) at 0.1-20 parts by weight to 100 parts by weight of said silica (b), wherein said diene-based rubber (a) contains styrene-butadiene copolymer rubber at 30-100 wt % with respect to said diene-based rubber (a), and
said styrene-butadiene copolymer rubber has
(i) a styrene component content of 5-45 wt %;
(ii) a butadiene 1,2-bond content of 10-80 wt %;
(iii) a glass transition temperature of −70 to −10° C.; and
(iv) an alkoxysilyl group content of 0.01-5.0 mmol per 100 g of said copolymer rubber, and
said compatibilizer (c) is at least one selected from among:
(I) Aminosilane compounds;
(II) Epoxy group-containing compounds;
(III) Compounds with an amino group and a hydroxyl group, an amino group and an epoxy group, an amino group and an ether bond, an amino group and a carboxyl group, an amino group and an ester bond or an amino group and a polymerizable unsaturated bond in the molecule;
(IV) Compounds with a polymerizable unsaturated bond and a hydroxyl group, a polymerizable unsaturated bond and an epoxy group, a polymerizable unsaturated bond and an ether bond, a polymerizable unsaturated bond and a carboxyl group or a polymerizable unsaturated bond and an ester bond in the molecule; and
(V) Ether bond-containing compounds.
[5] A rubber composition according to [4] above, wherein said compatibilizer (c) is at least one selected from among compounds of (I), (II), (III) and (IV) above.
[6] A rubber composition comprising a diene-based rubber (a), silica (b) at 5-100 parts by weight to 100 parts by weight of said diene-based rubber (a) and a compatibilizer (c) at 0.1-20 parts by weight to 100 parts by weight of said silica (b), wherein said diene-based rubber (a) contains styrene-butadiene copolymer rubber at 30-100 wt % with respect to said diene-based rubber (a), and
said styrene-butadiene copolymer rubber has
(i) a styrene component content of 5-45 wt %;
(ii) a butadiene 1,2-bond content of 10-80 wt %;
(iii) a glass transition temperature of −70 to −10° C.; and
(iv) an alkoxysilyl group content of 0.01-5.0 mmol and an amino group content of 0.01-2.0 mmol per 100 g of said copolymer rubber, and
said compatibilizer (c) is at least one selected from among:
(I) Aminosilane compounds;
(II) Epoxy group-containing compounds;
(III) Compounds with an amino group and a hydroxyl group, an amino group and an epoxy group, an amino group and an ether bond, an amino group and a carboxyl group, an amino group and an ester bond or an amino group and a polymerizable unsaturated bond in the molecule;
(IV) Compou
Akema Hiroshi
Kobayashi Naokazu
Nishibata Syuji
Tadaki Toshihiro
JSR Corporation
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Yoon Tae H.
LandOfFree
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