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US 5,708,053 AGranted
Silica-filled rubber compositions and the processing thereof
AssigneeThe Goodyear Tire & Rubber Company
InventorsGeorge Jalics, Adel Farhan Halasa, David John Zanzig
Life of this patent
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Abstract
The present invention relates to silica-filled rubber compositions and their method of processing. The rubber compositions contain a mixture of 10 to 150 phr of a particulate precipitated silica having dispersed thereon, from 1 to 20 percent by weight based upon the weight of the silica, of a silane-modified elastomer.
Claims15
A method of processing a silica-filled rubber composition which comprises mixing
- (i) 100 parts by weight of at least one sulfur-vulcanizable elastomer selected from conjugated diene homopolymers and copolymers and from copolymers of at least one conjugated diene and aromatic vinyl compound;
- and
- (ii) 10 to 150 phr of a particulate precipitated silica having dispersed thereon from 1 to 20 percent by weight, based upon the weight of the silica, of a silane-modified elastomer, wherein said silane-modified elastomer is obtained by reacting an active terminal of a resulting living polymer through polymerization of 1,3-butadiene or copolymerization of 1,3-butadiene and styrene in an inert organic solvent in the presence of an organic alkali initiator with a silane compound of the formula
- XyWySi(OR.sup.1).sub.z I
- wherein X is a halogen selected from the group consisting of chlorine, bromine and iodine;
- W is an alkylene radical having from 1 to 8 carbon atoms;
- y is 0 or 1;
- R.sup.1 is independently selected from the group consisting of alkyl radicals having from 1 to 8 carbon atoms and aryl radicals having from 6 to 24 carbon atoms;
- and z is 4 when y is 0 and z is 3 when y is 1.
6 more elements
A silica-filled rubber composition which is prepared by a process comprising mixing
- (i) 100 parts by weight of at least one sulfur-vulcanizable elastomer selected from conjugated diene homopolymers and copolymers and from copolymers of at least one conjugated diene and aromatic vinyl compound;
- and
- (ii) 10 to 150 phr of a particulate-precipitated silica having dispersed thereon from 1 to 20 percent by weight, based upon the weight of the silica, of a silane-modified elastomer, wherein said silane-modified elastomer is obtained by reacting an active terminal of a resulting living polymer through polymerization of 1,3-butadiene or copolymerization of 1,3-butadiene and styrene in an inert organic solvent in the presence of an organic alkali initiator with a silane compound of the formula
- XyWySi(OR.sup.1).sub.z
- wherein X is a halogen selected from the group consisting of chlorine, bromine and iodine;
- W is an alkylene radical having from I to 8 carbon atoms;
- y is 0 or 1;
- R.sup.1 is independently selected from the group consisting of alkyl radicals having from 1 to 8 carbon atoms and aryl radicals having from 6 to 24 carbon atoms;
- and z is 4 when y is 0 and z is 3 when y is 1.
6 more elements
A method of reducing the energy required in mixing a silica-filled rubber composition which comprises mixing
- (i) 100 parts by weight of at least one sulfur-vulcanizable elastomer selected from conjugated diene homopolymers and copolymers and from copolymers of at least one conjugated diene and aromatic vinyl compound;
- and
- (ii) 10 to 150 phr of a particulate precipitated silica having dispersed thereon from 1 to 20 percent by weight, based upon the weight of the silica of a silane-modified elastomer, wherein said silane-modified elastomer is obtained by reacting an active terminal of a resulting living polymer through polymerization of 1,3-butadiene or copolymerization of 1,3-butadiene and styrene in an inert organic solvent in the presence of an organic alkali initiator with a silane compound of the formula
- XyWySi(OR.sup.1).sub.z
- wherein X is a halogen selected from the group consisting of chlorine, bromine and iodine;
- W is an alkylene radical having from 1 to 8 carbon atoms;
- y is 0 or 1;
- R.sup.1 is independently selected from the group consisting of alkyl radicals having from 1 to 8 carbon atoms and aryl radicals having from 6 to 24 carbon atoms;
- and z is 4 when y is 0 and z is 3 when y is 1.
6 more elements
Dependencies are inferred from the claim text.