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US3897386A Expired / Lapsed US ⏱️ 0.0 years remaining

Tire treads

Assignee: Bridgestone Firestone Inc
•
Filing: 1972-06-08
•
Granted: 1975-07-29
•
Expires: 1992-06-08
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Abstract

Abstract In the production of vehicle tires, a vulcanizable tread composition which includes a reinforcing agent is applied to the tread portion of a tire mold and a tire body is then centrifugally cast in the mold against this tread. The tread is prepared from an elastomeric polymer selected from the class consisting of (a) polyhydroxy conjugated diene homopolymers or copolymers, (b) polyhydroxy copolymers of a conjugated diene and an aromatic vinyl monomer and (c) polyhydroxy copolymers of a conjugated diene and a vinyl nitrile monomer, by reacting the same with a diisocyanate in a one-step reaction. Any moisture present will convert isocyanate terminal groups to amino groups, and thus more or less amino-terminated polymers will be present. The NCO/OH ratio of the reactants must be at least about 1.15 or higher up to 2 or even 3 or higher.

Inventors

  • 👤 Jr Joseph C Sanda

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-29 20:12
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/62; B; B60; B60C; B60C1/00; B60C1/0016; C08G18/67; C08G18/69; C08G2380/00; Y; Y10; Y10S; Y10S152/00; Y10S152/905

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 121 words
THE METHOD OF PRODUCING A POLYURETHANE TREAD FOR A PNEUMATIC TIRE WHICH COMPRISES PRODUCING IN ONE STEP A POLYURETHANE BY HEATING TO CURING TEMPERATURE (A) A POLYHYDROXY ELASTOMERIC POLYMER OF THE CLASS CONSISTING OF (1) HOMOPOLYMERS AND COPOLYMERS OF CONJUGATED DIENES WHICH CONTAIN 4 TO 6 CARBON ATOMS AND (2) COPOLYMERS OF SUCH A DIENE AND AN AROMATIC VINYL MONOMER OR VINYL NITRILE MONOMER, AND (B) A DIISOCYANATE OR MIXTURE OF DIISOCYANATES, AND (C) TO 5 TO 25 PART OF N,N-BIS(22-HYDROXYPROPYL) ANILINE PER 100 PARTS OF DIHY DROXY POLYMER AND (D) SUFFICIENT REINFORCING AGENT TO MAKE THE COMPOSITION SERVICEABLE AS A TREAD, THE -NCO/-OH RATIO OF THE POLYMER OR POLYMERS AND THE DIISOCYANATE OR DIISOCYANATES BEING GREATER THAN 1.15 TO 5.0.
Claim 2
Independent Claim 121 words
THE METHOD OF PRODUCING A POLYURETHANE TREAD FOR A PNEUMATIC TIRE WHICH COMPRISES PRODUCING IN ONE STEP A POLYURETHANE BY HEATING TO CURING TEMPERATURE (A) A POLYHYDROXY ELASTOMERIC POLYMER OF THE CLASS CONSISTING OF (1) HOMOPOLYMERS AND COPOLYMERS OF CONJUGATED DIENES WHICH CONTAIN 4 TO 6 CARBON ATOMS AND (2) COPOLYMERS OF SUCH A DIENE AND AN AROMATIC VINYL MONOMER OR VINYL NITRILE MONOMER, AND (B) A DIISOCYANATE OR MIXTURE OF DIISOCYANATES, AND (C) TO 5 TO 25 PART OF N,N-BIS(22-HYDROXYPROPYL) ANILINE PER 100 PARTS OF DIHY DROXY POLYMER AND (D) SUFFICIENT REINFORCING AGENT TO MAKE THE COMPOSITION SERVICEABLE AS A TREAD, THE -NCO/-OH RATIO OF THE POLYMER OR POLYMERS AND THE DIISOCYANATE OR DIISOCYANATES BEING GREATER THAN 1.15 TO 5.0.
Claim 3
Dependent Claim 130 words
A tread for a pneumatic tire the elastomer of which is essentially a polyurethane derived in one-step synthesis from (a) a dihydroxy elastomeric polymer of the class consisting of (1) homopolymers and copolymers of conjugated dienes which contain 4 to 6 carbon atoms and (2) copolymers of such a diene and an aromatic vinyl monomer or vinyl nitrile monomer, and (b) a diisocyanate or mixture of diisocyanates, and (c) 5 to 25 parts of N,N-bis(2-hydroxypropyl) aniline per 100 parts of dihydroxy polymer and (d) sufficient reinforcing agent to make the composition, when cured, serviceable as a tread; the -NCO/-OH ratio of the polymer or polymers and the diisocyanate or diisocyanates being greater than 1.15 to 5.0, which tread comprises reinforcing and other pigment and is substantially free from unreacted diisocyanate.
Claim 4
Dependent Claim 130 words
A tread for a pneumatic tire the elastomer of which is essentially a polyurethane derived in one-step synthesis from (a) a dihydroxy elastomeric polymer of the class consisting of (1) homopolymers and copolymers of conjugated dienes which contain 4 to 6 carbon atoms and (2) copolymers of such a diene and an aromatic vinyl monomer or vinyl nitrile monomer, and (b) a diisocyanate or mixture of diisocyanates, and (c) 5 to 25 parts of N,N-bis(2-hydroxypropyl) aniline per 100 parts of dihydroxy polymer and (d) sufficient reinforcing agent to make the composition, when cured, serviceable as a tread; the -NCO/-OH ratio of the polymer or polymers and the diisocyanate or diisocyanates being greater than 1.15 to 5.0, which tread comprises reinforcing and other pigment and is substantially free from unreacted diisocyanate.
Claim 5
Dependent Claim 151 words
A pneumatic tire, the tread and sidewalls of which are composed of different elastomers bonded directly to one another by curing, the tread being composed of an elastomer which is essentially a polyurethane derived in a one-step synthesis from (a) a dihydroxy elastomeric polymer of the class consisting of (1) homopolymers and copolymers of conjugated dienes which contain 4 to 6 carbon atoms and (2) copolymers of such a diene and an aromatic vinyl monomer or vinyl nitrile monomer, and (b) a diisocyanate or mixture of diisocyanates, and (c) 5 to 25 parts of N,N-bis(2-hydroxylpropyl) aniline per 100 parts of dihydroxy polymer and (d) sufficient reinforcing agent to make the composition serviceable as a tread; the -NCO/-OH ratio of the polymer or polymers and the diisocyanate or diisocyanates in the tread being greater than 1.15 to 5.0, which tread comprises reinforcing and other pigment and is substantially free from unreacted diisocyanate.
Claim 6
Dependent Claim 151 words
A pneumatic tire, the tread and sidewalls of which are composed of different elastomers bonded directly to one another by curing, the tread being composed of an elastomer which is essentially a polyurethane derived in a one-step synthesis from (a) a dihydroxy elastomeric polymer of the class consisting of (1) homopolymers and copolymers of conjugated dienes which contain 4 to 6 carbon atoms and (2) copolymers of such a diene and an aromatic vinyl monomer or vinyl nitrile monomer, and (b) a diisocyanate or mixture of diisocyanates, and (c) 5 to 25 parts of N,N-bis(2-hydroxylpropyl) aniline per 100 parts of dihydroxy polymer and (d) sufficient reinforcing agent to make the composition serviceable as a tread; the -NCO/-OH ratio of the polymer or polymers and the diisocyanate or diisocyanates in the tread being greater than 1.15 to 5.0, which tread comprises reinforcing and other pigment and is substantially free from unreacted diisocyanate.

References Cited (Backward Citations)

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USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-07-28 1979-01-27 1979-07-29 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-07-28 1983-01-27 1983-07-29 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-07-28 1987-01-27 1987-07-29 $7700.00 Window Closed / Lapsed

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