Deflation-proof pneumatic tire and elastomeric fillings therefore
OwnerRansome J. Wymaninventor
Life of this patent
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Abstract
A deflation-proof pneumatic tire comprises a casing and a substantially void-free, preferably oil-containing elastomeric filling material. The tire casing is injected with a combination comprising a polyol, an organic polyisocyanate and water, in amounts and under conditions sufficient to produce carbon dioxide and form a polyurea-containing polyurethane elastomer in which the carbon dioxide is dissolved in the elastomer, thereby providing a substantially void-free filling material. The formulation permits the addition of a substantial amount of extender oil while retaining an acceptable level of hardness.
Claims13
A method for obtaining a deflation-proof tire, comprising:
- filling a pneumatic tire casing to a pressure of at least 25 psi with a liquid solution prior to significant production of carbon dioxide, said solution comprising, in combination, a polyol, an organic polyisocyanate and water, in amounts sufficient to produce carbon dioxide and form a polyurethane elastomer containing polyurea, said pressure being sufficient to prevent bubble formation in the tire;
- and
- curing said elastomer to maintain said carbon dioxide dissolved in said elastomer whereby to produce a substantially void-free elastomeric filling material within said casing.
A method for obtaining a deflation-proof tire, comprising:
- filling a pneumatic tire casing with a liquid solution prior to significant production of carbon dioxide, to a predetermined desired tire pressure, said solution comprising, in combination, a polyol, an organic polyisocyanate and water, in amounts sufficient to produce carbon dioxide and form a polyurethane elastomer containing polyurea, said combination additionally comprising an inorganic absorbant for said carbon dioxide, said pressure being sufficient to prevent bubble formation in the tire;
- and
- curing said elastomer to maintain said carbon dioxide dissolved in said elastomer whereby to produce a substantially void-free elastomeric filling material within said casing.
A method for obtaining a deflation-proof tire comprising:
- injecting into a pneumatic tire casing a liquid solution comprising in combination a triol having a molecular weight of at least 3000, an organic polyisocyanate, water and substantially aromatic extender oil, in amounts sufficient to produce carbon dioxide and form a polyurea-containing polyurethane elastomer, having a Durometer hardness of at least 20 A;
- filling said tire casing prior to significant production of carbon dioxide to a pressure of at least 25 psi, said pressure being sufficient to prevent bubble formation in the tire;
- and
- curing said elastomer to maintain said carbon dioxide dissolved in said elastomer whereby to produce said polymer-containing urethane elastomer as a substantially void-free filling material within said casing.
A method for obtaining a deflation-proof tire comprising:
- injecting into a pneumatic tire casing a liquid solution comprising in combination a triol having a molecular weight of at least 3000, an organic polyisocyanate, water and substantially aromatic extender oil, in amounts sufficient to produce carbon dioxide and form a polyurea-containing polyurethane elastomer, having a Durometer hardness of at least 20 A, said combination additionally comprising an inorganic absorbent for said carbon dioxide;
- filling said tire casing prior to significant production of carbon dioxide to a desired tire pressure, said pressure being sufficient to prevent bubble formation in the tire;
- and
- curing said elastomer to maintain said carbon dioxide dissolved in said elastomer whereby to produce said polymer-containing urethane elastomer as a substantially void-free filling material within said casing.
Dependencies are inferred from the claim text.