Heterogeneous silica carbon black-filled rubber compound
AssigneeThe Goodyear Tire & Rubber Company
InventorsRichard Robinson Smith, Kevin James Pyle, William Paul Francik, Paul Harry Sandstrom
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Abstract
The present invention relates to a heterogeneous silica/carbon black-filled rubber compound and a process for making the same. The rubber compound is characterized by containing silica, two different carbon blacks and two different rubbers. One of the carbon blacks is selectively dispersed in one rubber along with the silica and the other carbon black is dispersed in another rubber. The two rubber compounds are then mixed to form a heterogeneous rubber compound.
Claims44
A process for the production of a heterogeneous precipitated silica/carbon black-filled rubber compound comprising
- (a) intimately dispersing substantially all of the precipitated silica filler and a first carbon black in a first rubber to form a silica/first carbon black-filled compound;
- (b) separately and intimately dispersing a second carbon black in a second rubber to form a second carbon black-filled compound;
- and
- (c) mixing said silica/first carbon black-filled compound with said second carbon black-filled compound to form a heterogeneous silica/carbon black-filled rubber compound, wherein said first carbon black and second carbon black are different from each other and one of said first carbon black or second carbon black has a DBP absorption value in a range of from about 90 to about 160 cc/100 gm and a corresponding Iodine Number in a range of from about 90 to about 150 g/kg and the other first or second carbon black has a DBP absorption value in a range of from about 60 to about 160 cc/100 gm with a corresponding Iodine Absorption Number in a range of about 25 to about 85 g/kg;
- and wherein said first rubber and second are different from each other and one of said first rubber or second rubber is cis 1,4-polyisoprene and the other first or second rubber is selected from the group consisting of emulsion polymerized styrene/butadiene copolymers, solution polymerized styrene/butadiene copolymers, cis 1,4-polybutadiene, styrene/isoprene copolymers, 3,4-polyisoprene, isoprene/butadiene copolymers, medium vinyl polybutadiene, styrene/isoprene/butadiene terpolymers, butyl rubber, polychloroprene, acrylonitrile/butadiene copolymers and ethylene/propylene/diene terpolymers and mixtures thereof.
A heterogeneous precipitated silica/carbon black-filled rubber compound by a process comprising
- (a) intimately dispersing substantially all of the precipitated silica filler and a first carbon black in a first rubber to form a silica/first carbon black-filled compound;
- (b) separately and intimately dispersing a second carbon black in a second rubber to form a second carbon black-filled compound;
- and
- (c) mixing said silica/first carbon black-filled compound with said second carbon black-filled compound to form a heterogeneous silica/carbon black-filled rubber compound, wherein said first carbon black and second carbon black are different from each other and one of said first carbon black or second carbon black has a DBP absorption value in a range of from about 90 to about 160 cc/100 gm and a corresponding Iodine Number in a range of from about 90 to about 150 g/kg and the other first or second carbon black has a DBP absorption value in a range of from about 60 to about 160 cc/100 gm with a corresponding Iodine Absorption Number in a range of about 25 to about 85 g/kg;
- and wherein said first rubber and second are different from each other and one of said first rubber or second rubber is cis 1,4-polyisoprene and the other first or second rubber is selected from the group consisting of emulsion polymerized styrene/butadiene copolymers, solution polymerized styrene/butadiene copolymers, cis 1,4-polybutadiene, styrene/isoprene copolymers, 3,4-polyisoprene, isoprene/butadiene copolymers, medium vinyl polybutadiene, styrene/isoprene/butadiene terpolymers, butyl rubber, polychloroprene, acrylonitrile/butadiene copolymers and ethylene/propylene/diene terpolymers and mixtures thereof.
Dependencies are inferred from the claim text.