US4094353A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tires having a solid polyurethane core
Assignee: Dunlop Ltd
•
Filing: 1976-02-27
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Granted: 1978-06-13
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Expires: 1996-02-27
Abstract
Abstract A process for puncture-proofing a pneumatic tire mounted on a wheel rim comprises filling the tire with a liquid reactant mixture of (a) at least one liquid polyoxypropylene polyether polyol and (b) a diphenylmethane diisocyanate chemically modified by known means to liquid form, the amounts of these reactants being such that the ratio of functional isocyanate groups to hydroxyl groups in the reactants is in the range 0.65 to 0.9, and cross-linking said mixture to form a resilient solid polyurethane material filling the tire, and a tire and wheel rim assembly so formed.
Inventors
- 👤 Peter Ford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:23
CPC Classifications
B; B60; B60C; B60C7/00; B60C7/10; B60C7/101; B29; B29D; B29D30/00; B29D30/02; Y; Y10; Y10T; Y10T152/00; Y10T152/10; Y10T152/10279; Y10T152/10378
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
87 words
A tire and wheel rim assembly comprising a tire having a reinforced carcass, a wheel rim on which the tire is mounted to define a chamber, the chamber having a filling of resilient solid polyurethane material consisting of the reaction product of a) at least one liquid polyoxpropylene polyether polyol and b) a diphenylmethane diisocyanate chemically modified by known means to liquid form, the amounts of these reactants being such that the ratio of functional isocyanate groups to hydroxyl groups is in the range 0.65 to 0.9.
Claim 2
Dependent Claim
87 words
A tire and wheel rim assembly comprising a tire having a reinforced carcass, a wheel rim on which the tire is mounted to define a chamber, the chamber having a filling of resilient solid polyurethane material consisting of the reaction product of a) at least one liquid polyoxpropylene polyether polyol and b) a diphenylmethane diisocyanate chemically modified by known means to liquid form, the amounts of these reactants being such that the ratio of functional isocyanate groups to hydroxyl groups is in the range 0.65 to 0.9.
Claim 3
Dependent Claim
16 words
An assembly according to claim 1 in which the liquid polyoxypropylene polyether polyol is a triol.
Claim 4
Dependent Claim
35 words
An assembly according to claim 2 in which the molecular weight of the triol is selected in order to obtain a solid reaction product having a hardness in the range 10 to 50 Shore A.
Claim 5
Dependent Claim
28 words
An assembly according to claim 2 in which the liquid polyoxypropylene polyether polyol consists of a mixture of two or more polyoxypropylene polyether triols of different molecular weights.
Claim 6
Dependent Claim
18 words
An assembly according to claim 1 in which the diphenylmethane diisocyanate is a liquid carbodiimide-modified diphenylmethane diisocyanate (MDI).
Claim 7
Dependent Claim
27 words
An assembly according to claim 1 in which the ratio of functional isocyanate groups to hydroxyl groups in said reactants is in the range 0.67 to 0.80.
Claim 8
Dependent Claim
37 words
An assembly according to claim 1 in which the speed of reaction between the liquid polyoxypropylene polyether polyol and the diphenylmethane diisocyanate is adjusted by means of addition of a catalyst for the reaction, to said reactants.
Claim 9
Dependent Claim
13 words
An assembly according to claim 7 in which the catalyst is stannous octoate.
Claim 10
Dependent Claim
84 words
A process for puncture-proofing a pneumatic tire mounted on a wheel rim comprises filling the tire with a liquid reactant mixture of (a) at least one liquid polyoxypropylene polyether polyol and (b) a diphenylmethane diisocyanate chemically modified by known means to liquid form the amounts of these reactants being such that the ratio of functional isocyanate groups to hydroxyl groups in the reactants is in the range 0.65 to 0.9, and cross-linking said mixture to form a resilient solid polyurethane material filling the tire.
Claim 11
Dependent Claim
84 words
A process for puncture-proofing a pneumatic tire mounted on a wheel rim comprises filling the tire with a liquid reactant mixture of (a) at least one liquid polyoxypropylene polyether polyol and (b) a diphenylmethane diisocyanate chemically modified by known means to liquid form the amounts of these reactants being such that the ratio of functional isocyanate groups to hydroxyl groups in the reactants is in the range 0.65 to 0.9, and cross-linking said mixture to form a resilient solid polyurethane material filling the tire.
Claim 12
Dependent Claim
47 words
A process according to claim 9 in which filling of the tire is carried out by forcing a liquid mixture of the reactants into the tire under pressure the tire being vented in such a position that entrapment of air bubbles in the tire is substantially eliminated.
Claim 13
Dependent Claim
36 words
A process according to claim 10 in which the tire is vented in such a manner that a back-pressure is maintained in the tire to keep the tire beads in sealing relationship with the wheel rim.
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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) | 1981-06-12 | 1981-12-12 | 1982-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-12 | 1985-12-12 | 1986-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-12 | 1989-12-12 | 1990-06-13 | $7700.00 | Window Closed / Lapsed |