A flat free pneumatic tire comprising a casing and a void free elastomeric filling material, which filling material is a polyurethane of (a) prepolymer of organic polyisocyanate and defined polyether or defined polyester and (b) a defined polyether or defined polyester, in the absence of foam producing material in the reaction zone. The elastomeric filling material itself. A two container article (system) adapted for producing said void free filling material where one container has said prepolymer reactant and the other container has the polyether or polyester reactant, as required.
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1. A flat free pneumatic tire comprising a pneumatic tire casing and an essentially void-free polyurethane elastomeric filling material confined, at least in part, by said casing, said elastomeric material being the product of the reaction of, in the essential absence of foam producing material in the reaction zone, a defined prepolymer and a defined other reactant, where
said prepolymer reactant is selected from the class consisting of 1. organic polyisocyanate and hydroxyl group terminated polyfunctional polyether, wherein essentially all the prepolymer terminal groups are isocyanate groups; 2. organic polyisocyanate and hydroxyl group terminated polyfunctional polyester, wherein essentially all the prepolymer terminal groups are isocyanate groups; 3. organic polyisocyanate and hydroxyl group terminated polyfunctional polyether wherein essentially all the prepolymer terminal groups are isocyanate groups which groups have been blocked to afford "isocyanate" reactivity only at elevated temperature; and 4. organic polyisocyanate and hydroxyl group terminated polyfunctional polyester wherein essentially all the prepolymer terminal groups are isocyanate groups which groups have been blocked to afford "isocyanate" reactivity only at elevated temperature; said other reactant is hydroxyl group terminated polyfunctional polyether, in the case of said prepolymer (1) and said prepolymer (3) to obtain poly(ether)urethane elastomeric material; said other reactant is hydroxyl group terminated polyfunctional polyester, in the case of said prepolymer (2) and said prepolymer (4) to obtain poly(ester)urethane elastomeric material; said polyurethane elastomeric material being characterized in part by an essential freedom from voids.
2. The tire as defined in
3. The tire of
4. The tire of
5. The tire of
6. The tire of
7. The tire of
8. The tire of
9. A resilient essentially void-free polyurethane elastomer material product adapted for use as a filling material for a pneumatic tire, said elastomeric material being the product of the reaction of, in the essential absence of foam producing material in the reaction zone, a defined prepolymer reactant and a defined other reactant, where
said prepolymer reactant is selected from the class consisting of (1) organic polyisocyanate and hydroxyl group terminated polyfunctional polyether, wherein essentially all the prepolymer terminal groups are isocyanate groups; (2) organic polyisocyanate and hydroxyl group terminated polyfunctional polyester, wherein essentially all the prepolymer terminal groups are isocyanate groups; (3) organic polyisocyanate and hydroxyl group terminated polyfunctional polyether wherein essentially all the prepolymer terminal groups are isocyanate groups which groups have been blocked to afford "isocyanate" reactivity only at elevated temperature; and (4) organic polyisocyanate and hydroxyl group terminated polyfunctional polyester wherein essentially all the prepolymer terminal groups are isocyanate groups which groups have been blocked to afford "isocyanate" reactivity only at elevated temperature; said other reactant is hydroxyl group terminated polyfunctional polyether, in the case of said prepolymer (1) and said prepolymer (3) to obtain poly(ether)urethane elastomeric material; said other reactant is hydroxyl group terminated polyfunctional polyester, in the case of said prepolymer (2) and said prepolymer (4) to obtain poly(ester)urethane elastomeric material; said polyurethane elastomeric material being characterized in part by an essential freedom from voids.
10. The product of
11. The product of
12. The product of
13. The product of
14. The product of
15. The product of
16. A resilient essentially void-free polyurethane elastomeric material product adapted for use as a filling material for pneumatic tires, said elastomeric material being the product of the reaction of
a. a prepolymer of about 16 parts of toluene diisocyanate, 80/20 isomer content, and about 84 parts of triol polyoxypropylene derivative of glycerine of about 3,000 molecular weight, and about 0.03 parts of stannous octoate catalyst, at ambient temperature, said prepolymer having a theoretical free isocyanate group content of 4.2% and an equivalent weight of about 1,000; b. a mixture of polyoxypropylene diol of molecular weight of about 2,000 and the triol of (a), said mixture having an equivalent weight of about 1,000; c. said prepolymer of (a) and said mixture of (b) being reacted in about equal weight parts, in the presence of about 0.2 parts of stannous octoate catalyst, and d. the liquid reaction product of (c) being cured at about 160° F. for about 12 hours to obtain a resilient, essentially void-free elastomeric product.
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This is a continuation-in-part application of my copending application Ser. No. 397,940, filed Sept. 17, 1973, pot life of the mixture is then injected into the prepared wheel and tire casing as described above and allowed to cure for 12 hours at 200° F. The liquid mixture will cure with the following characteristics:
| ______________________________________ |
| Tensile strength approximately |
| 1400 psi |
| Elongation to rupture |
| 500% |
| Tear strength (Die C) |
| 68-75 p.l.i. |
| Durometer hardness, A Scale |
| 30± |
| ______________________________________ |
The physical characteristics of the cured material can be changed within a limited range by changing the ratio of Estrol 600 to prepolymer. It is found that 50 parts of Estrol 600 mixed with 50 parts of prepolymer will result in a cured rubber with Durometer hardness of 43 of the A Scale. Hardness decreases as the mixture is changed from this equal part mixture within a range of from 40 parts prepolymer with 60 parts Estrol 600 to 60 parts prepolymer with 40 parts Estrol 600. This range of mixtures will provide a Durometer hardness in the range of 25-43 on the A Scale.
A. Two popular sizes (8.25× 15 and 10.00×15) of mining vehicle tires were filled using the method of the invention using the reactants of Example II in that proportion to obtain void free filled pneumatic tires. Closed cell foam filled tires are available commercially in these sizes.
Conventional air filled tires, the foam filled tires, and the void free filled tires were tested for deflection. In the rated load range, the void free tires were equal to the air filled tires. In the overload condition, the void free filled tires showed less deflection than the air filled tires. The void free filled tires were better than the foam filled tires in both the rated load and in the overload condition.
Laboratory tests showed a definite advantage on heat buildup characteristics for the void free filled tires over the foam filled tires.
B. (1). Truck tires of rib design, highway type, in road tests showed void free filled tires averaged about 80° F. cooler running than foam filled tires.
(2). Truck tires of the traction type, cross bar lug design showed the void free filled tires gave excellent results at speeds of 60 mph or less. Continuous speeds of 60-70 mph for periods of 5 hours did show beginning of excessive heat buildup.
(3). Truck tires of extra heavy rib design, M&L type, showed foam filled tires failed after only a few miles at 60 mph -- caught fire. No void free filled tire failed this test.
C. Some GR70-15 radial tires filled with void free filling were run on heat stabilization tests on an indoor test wheel. One tire showed "high" temperature after being run 6 hours at 80 mph. All the other tires in this test showed satisfactory performance temperature after 6 hours at 80 mph.
It was concluded from the above tests that this void free elastomeric filling material possesses the necessary characteristics for a pneumatic tire filling material.
The foregoing detailed description is to be clearly understood as given by way of illustration and example only, the spirit and scope of this invention being limited solely by the appended claims.
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| 3605848, |
| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Nov 14 1977 | Synair Corporation | (assignment on the face of the patent) | / |
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