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US 6,186,202 B1Granted
Silica reinforced solventless elastomeric adhesive compositions
AssigneeThe Goodyear Tire & Rubber Company
InventorsRamendra Nath Majumdar, Lewis Timothy Lukich, Thomas Edwin Duncan, Bruce Raymond Hahn
Life of this patent
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Abstract
A silica reinforced solventless adhesive composition or cushion comprises a blend of rubber, silica, a silica coupling agent, an optional tackifier, and low or nil amounts of carbon black. The elastomeric adhesive composition can be utilized with various other rubber layers to adhere a cured or uncured tire tread to a cured tire casing. The elastomeric adhesive composition has good blowout resistance and a very low, final blowout test temperature.
Claims9
A retreaded tire assembly, comprising:
- a circular laminate including a cured casing having an outer peripheral surface;
- a circular, uncured, solvent free adhesive cushion layer having an inner and outer peripheral surface, said inner peripheral surface of said cushion layer being directly adhered to said outer peripheral surface of said cured casing without intervening layers of cement or adhesives, said adhesive cushion layer consisting essentially of a blend of at least one rubber, sulfur, a tackifying agent, from about 40 to about 60 phr of silica, less than 20 phr by weight of carbon black, and a silica coupling agent, said adhesive cushion layer rubber being natural rubber, a polymer or copolymer derived from at least one conjugated diene having from 4 to about 7 carbon atoms, a copolymer made from a conjugated diene having from 4 to about 7 carbon atoms and a vinyl substituted aromatic having from 8 to 12 carbon atoms, or blends thereof, said silica coupling agent having the formula
- wherein n is from 2 to 6, wherein x and y independently is from 1 to 4, and R1 through R6 independently is an alkyl having from 1 to 4 carbon atoms, and
- a retread layer having an inner surface adhered to said outer peripheral surface of said cushion layer, the rubber component of said retread layer consisting of natural rubber, a rubber derived from a conjugated diene having from 4 to 10 carbon atoms, or a rubber derived from a conjugated diene having from 4 to 10 carbon atoms and a vinyl substituted aromatic monomer having from 8 to 12 carbon atoms, or blends thereof.
1 more element
A retread layer and a cured tire casing, comprising:
- a first elastomeric layer, the rubber component of said first elastomeric layer consisting of natural rubber, a rubber derived from a conjugated diene having from 4 to 10 carbon atoms, or a rubber derived from a conjugated diene having 4 to 10 carbon atoms and a vinyl substituted aromatic monomer having from 8 to 12 carbon atoms, or blends thereof;
- a second elastomeric layer, said second elastomeric layer being cured, and
- an uncured adhesive cushion layer adhering said first elastomeric layer to said second elastomeric layer, said adhesive cushion layer being an uncured composition in direct contact with said cured second elastomeric layer without intervening layers of cement or adhesive, said adhesive cushion layer consisting essentially of a rubber, a tackifying agent, from about 40 to about 60 phr of silica, 20 parts by weight or less of carbon black per one hundred parts by eight rubber, and a silica coupling agent, said adhesive cushion layer rubber being natural rubber, a polymer or copolymer derived from at least one conjugated diene having from 4 to about 7 carbon atoms, or a copolymer derived from a conjugated diene having from 4 to about 7 carbon atoms and a vinyl substituted aromatic having from 8 to 12 carbon atoms, or blends thereof, said silica coupling agent having the formula
- wherein n is from 2 to 6, wherein x and y independently is from 1 to 4, and R1 through R6 independently is an alkyl having from 1 to 4 carbon atoms, wherein said first and second elastomeric layers comprise a retread layer and a cured tire casing
- and wherein said adhesive cushion layer is substantially free of any volatile organic compound.
2 more elements
Dependencies are inferred from the claim text.