Universal cement for natural and synthetic rubber tire compounds
AssigneeThe B. F. Goodrich Company
InventorChong-Kon Rhee
Life of this patent
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Abstract
A universal cement composition is disclosed suitable for both natural and synthetic rubber based tire compounds which solves the tack and cured adhesion problems heretofore encountered at the tread splice region of radial and bias/belted tires. The composition disclosed contains 75 to 90 parts by weight ("wt") of a cis-polybutadiene elastomer, 10 to 25 parts by wt of natural rubber, 5 to 30 parts by wt of a phenolic tackifying resin, and 40 to 80 parts by wt of a fine reinforcing carbon black and has an AMEDA carbon black dispersion rating of from 96 to 99 percent.
Claims7
An adhesive composition for tread splicing containing
- (a) from 75 to 90 parts by weight of a cis-polybutadiene elastomer having a Mooney viscosity (ML-4) of at least 30;
- (b) from 10 to 25 parts by weight of natural rubber;
- (c) from 40 to 80 parts by weight of reinforcing carbon black having a surface area of at least 70 m.sup.2 /g;
- (d) from 5 to 30 parts by weight of a p-alkylphenol tackifying resin;
- and,
- (e) other compounding ingredients including zinc oxide, sulfur and an accelerator;
- the amounts by weight being based on 100 parts by weight of rubbers contained in the composition;
- said adhesive composition having an AMEDA carbon black dispersion rating of at least 95 percent.
A radial tire of generally toroidal shape having a fabric-reinforced carcass, an annular two-layer tread comprising an external circumferential cap portion and a circumferential undertread portion, and a plurality of circumferential belts between the tread and the carcass, each comprising wires or cords embedded in a natural rubber-based rubber compound, said tread having spliced tapered end portions joined by a compatible synthetic rubber-based tread-adhesive composition containing
- (a) from 75 to 90 parts by weight of a cis-polybutadiene elastomer having a Mooney viscosity (ML-4) of at least 30;
- (b) from 10 to 25 parts by weight of natural rubber;
- (c) from 40 to 80 parts by weight of reinforcing carbon black having a surface area of at least 70 m.sup.2 /g;
- (d) from 5 to 30 parts of a p-alkylphenol tackifying resin;
- and,
- (e) other compounding ingredients including zinc oxide, sulfur and an accelerator;
- the amounts by weight being based on 100 parts by weight of rubbers contained in the composition;
- said adhesive composition having an AMEDA carbon black dispersion rating of at least 95 percent.
Dependencies are inferred from the claim text.