Claims
- 1. A rubber composition comprised of (A) 100 parts by weight of at least one diene-based elastomer, (B) about 10 to about 250 phr particulate silica and (C) from 0.5 to 50 phr of a silica coupler of the formula: ##STR6## wherein R.sup.1, R.sup.2 and R.sup.3 individually represent hydrogen or an alkyl of 1 to 6 carbon atoms; X represents oxygen or sulfur; and Z represents a hydroxyalkyl group of 2 to 7 carbon atoms.
- 2. The rubber composition of claim 1 wherein R.sup.1, R.sup.2 and R.sup.3 are each hydrogen.
- 3. The rubber composition of claim 1 wherein Z is a hydroalkyl group of two to four carbon atoms.
- 4. The rubber composition of claim 1 wherein R.sup.1, R.sup.2 and R.sup.3 are each hydrogen and Z is a hydroxyalkyl group of two carbon atoms.
- 5. The rubber composition of claim 1 where said silica coupler is present in an amount ranging from 1.5 to 8 phr.
- 6. The rubber composition of claim 1 wherein the diene based elastomer is selected from at least one of cis 1,4-polyisoprene rubber, 3,4-polyisoprene rubber, styrene/butadiene copolymer rubbers, styrene/isoprene/butadiene terpolymer rubbers, cis 1,4-polybutadiene rubber, and emulsion polymerization prepared styrene/butadiene/acrylonitrile terpolymer rubber and butadiene/acrylonitrile copolymer rubber.
- 7. The rubber composition of claim 1 wherein the silica is characterized by having a BET surface area in a range of about 40 to about 600 square meters per gram and a dibutylphthalate (DBP) absorption value in a range of about 100 to about 400.
- 8. A process for improving the reinforcing properties of a rubber polymer containing a siliceous filler comprising adding 0.5 to 50 phr of a silica coupler of the formula: ##STR7## wherein R.sup.1, R.sup.2 and R.sup.3 individually represent hydrogen or an alkyl of 1 to 6 carbon atoms; X represents oxygen or sulfur; and Z represents a hydroxyalkyl group of 2 to 7 carbon atoms.
Parent Case Info
This is a Divisional of application Ser. No. 08/681,031, filed on Jul. 22, 1996, now U.S. Pat. No. 5,679,727, which is a Continuation of application Ser. No. 08/304,294, filed on Sep. 12, 1994, now abandoned.
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Divisions (1)
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Number |
Date |
Country |
Parent |
681031 |
Jul 1996 |
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Continuations (1)
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Number |
Date |
Country |
Parent |
304294 |
Sep 1994 |
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