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AssigneeThe Dow Chemical Company
InventorsLouis W. Meyer, Linda M. McKinney, Don H. Kelley
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This invention is an improvement in a process for preparing a polyurethane backed substrate whereby a reacting polyurethane forming mixture comprising at least one polyahl and at least one polyisocyanate as applied to a substrate and subsequently curing thereon to form an attached polyurethane backing. The improvement which is this invention comprises employing an organoiron or organobismuth catalyst for said polyurethane forming mixture. The organoiron or organobismuth catalyst is employed in an amount such that the polymer forming mixture exhibits the viscosity of not greater than about 20,000 cps 2 minutes after the polyahl and polyisocyanates are contacted in the presence of said catalyst at 20.degree.-50.degree. C. and the polyurethane forming mixture cures to a tack free state at an elevated temperature in the presence of said catalyst in less than about 8 minutes.
In a process for preparing a polyurethane backed substrate whereby a reacting polyurethane forming mixture comprising at least one polyahl and at least one polyisocyanate is applied to a substrate and subsequently cured thereon to form an attached polyurethane backing, the improvement which comprises employing an organoiron or organobismuth catalyst in said polyurethane forming mixture, said organoiron or organobismuth catalyst being employed in an amount such that said polyurethane forming mixture has a viscosity of not greater than 20,000 cps two minutes after the polyurethane forming mixture is contacted with said organoiron or organobismuth at 20.degree.-50.degree. C. and the polyurethane forming mixture reaches a tack free state in less than about 8 minutes upon curing at about 100.degree.-150.degree. C. in the presence of said organoiron or organobismuth catalyst.
Dependencies are inferred from the claim text.