US3980606A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane elastomers having prolonged flex life and tires made therefrom
Assignee: Bridgestone Firestone Inc
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Filing: 1975-02-24
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Granted: 1976-09-14
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Expires: 1995-02-24
Abstract
Abstract Polyurethane elastomers having prolonged flex life are prepared by reacting a diisocyanate with polypropylene glycol (PPG) or triol and poly(tetramethylene ether) glycol (PTEG). The diisocyanate may be reacted with each glycol separately or they may be mixed before the reaction. A smaller amount of the prepolymer obtained from the polypropylene glycol or triol is mixed with a larger amount of the prepolymer obtained from the poly(tetramethylene ether) glycol and the mixture is reacted with a hindered aromatic diamine. Elastomers cured from the resulting mixed polyurethane were found to have an exceptionally high flex life and are particularly useful in the production of products which undergo dynamic flexing, as in the preparation of pneumatic tires, particularly the sidewalls thereof, because of their exceptionally long flex life.
Inventors
- 👤 Byron H. Werner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:22
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4804; C08G18/4812; C08G18/08; C08G18/10; C08G18/12; C08G18/4808; C08G2380/00; Y; Y10; Y10T; Y10T152/00; Y10T152/10; Y10T152/10495; Y10T152/10819; Y10T152/10846
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
124 words
A pneumatic tire the sidewalls of which are composed essentially of a cured mixture of (A) 95 to 75 parts by weight of a polyurethane prepolymer with a molecular weight of 950 to 1850, which is the reaction product of substantially one mole of poly(tetramethylene ether) glycol and substantially 2 moles of a toluene diisocyanate and (B) 5 to 25 parts by weight of a prepolymer which is the reaction product of substantially 1 mole of polypropylene glycol or triol and substantially 2 or 3 moles, respectively, of a toluene diisocyanate, which prepolymer B has a molecular weight of 2350 to 4000, said mixtures being cured by a hindered aromatic diamine and producing a polyurethane in which the NH 2 /NCO ratio is 0.95-1.20.
Claim 2
Dependent Claim
124 words
A pneumatic tire the sidewalls of which are composed essentially of a cured mixture of (A) 95 to 75 parts by weight of a polyurethane prepolymer with a molecular weight of 950 to 1850, which is the reaction product of substantially one mole of poly(tetramethylene ether) glycol and substantially 2 moles of a toluene diisocyanate and (B) 5 to 25 parts by weight of a prepolymer which is the reaction product of substantially 1 mole of polypropylene glycol or triol and substantially 2 or 3 moles, respectively, of a toluene diisocyanate, which prepolymer B has a molecular weight of 2350 to 4000, said mixtures being cured by a hindered aromatic diamine and producing a polyurethane in which the NH 2 /NCO ratio is 0.95-1.20.
Claim 3
Dependent Claim
37 words
The tire of claim 1 in which prepolymer A is essentially the reaction product of 1 mole of polytetramethylene ether glycol having a molecular weight of 600 to 1500 and substantially 2 moles of 80/20 2,4/2,6-toluene diisocyanate.
Claim 4
Dependent Claim
36 words
The tire of claim 1 in which prepolymer A is essentially the reaction product of 1 mole of polytetramethylene ether glycol having a molecular weight of 600 to 1500 and substantially 2 moles of 2,4-toluene diisocyanate.
Claim 5
Dependent Claim
32 words
The tire of claim 1 in which prepolymer B is essentially the reaction product of 1 mole of polypropylene glycol of molecular weight of substantially 3000 and 2 moles of a toluene/diisocyanate.
Claim 6
Dependent Claim
33 words
The tire of claim 1 in which prepolymer B is essentially the reaction product of 1 mole of polypropylene triol of molecular weight of substantially 3000 and 3 moles of a toluene diisocyanate.
Claim 7
Dependent Claim
14 words
The tire of claim 1 in which the diamine is trismethylene dianiline/sodium chloride complex.
Claim 8
Dependent Claim
11 words
The tire of claim 1 in which the diamine is 4,4'-methylene-bis)2-chloroaniline).
Claim 9
Dependent Claim
26 words
The tire of claim 1 in which the polyurethane is plasticized with substantially 10 to 25 parts of polyurethane plasticizer per 100 parts of the polyurethane.
Claim 10
Dependent Claim
12 words
The tire of claim 1 in which the plasticizer is dioctyl phthalate.
Claim 11
Independent Claim
77 words
The method of producing a polyurethane of high flexibility which comprises forming a first prepolymer from 1 mole of poly(tetramethylene ether) glycol and substantially 2 moles of a toluene diisocyanate, forming a second prepolymer from 1 mole of polypropylene glycol or triol and substantially 2 or 3 moles, respectively, of a toluene diisocyanate, and curing 5 to 25 parts of the second prepolymer and 95 to 75 parts of the first prepolymer with a hindered aromatic diamine.
Claim 12
Independent Claim
77 words
The method of producing a polyurethane of high flexibility which comprises forming a first prepolymer from 1 mole of poly(tetramethylene ether) glycol and substantially 2 moles of a toluene diisocyanate, forming a second prepolymer from 1 mole of polypropylene glycol or triol and substantially 2 or 3 moles, respectively, of a toluene diisocyanate, and curing 5 to 25 parts of the second prepolymer and 95 to 75 parts of the first prepolymer with a hindered aromatic diamine.
Claim 13
Dependent Claim
17 words
The process of claim 10 in which the prepolymers are formed separately and then blended before curing.
Claim 14
Dependent Claim
16 words
The process of claim 10 in which the cure is effected with tris-methylene dianiline/sodium chloride complex.
Claim 15
Dependent Claim
13 words
The process of claim 10 in which the cure is effected with 4,4'-methylene-bis(2-chloroaniline).
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-14 | 1980-03-15 | 1980-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-14 | 1984-03-15 | 1984-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-14 | 1988-03-15 | 1988-09-14 | $7700.00 | Window Closed / Lapsed |