Zero pressure device such as tires or run-flat rings

Details Zero pressure device such as tires or run-flat rings Zero pressure device such as tires or run-flat rings

B - Operations, Transporting

60

C

403/14, 152/81,

B60C 1/00 (2006.01) B60C 7/10 (2006.01) B60C 17/06 (2006.01) C08G 18/10 (2006.01) C08G 18/66 (2006.01) C08G 18/79 (2006.01)

Patent

CA 1092296

Abstract of the Disclosure A zero pressure device is composed of either a micro- cellular or homogeneous polyurethane made by reacting an organic polyisocyanate with at least three polyols, a mono- meric polyol of 2 to 3 hydroxyls having a molecular weight of less than 250, a polyester polyol of 2 to 3 hydroxyls having a molecular weight of 800 to 3000 and a polyether polyol of 2 to 3 hydroxyls having a molecular weight of 4 to 7000. When the zero pressured device is a run-flat ring for a tire- wheel assembly, it has an average density of 60 to 65 pounds per cubic foot and 30 to 42 pounds per cubic foot when it is a tire.

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