| 摘要 |
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. |
