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US 4,379,904 AGranted
Novel polyurethane product
AssigneeThe Upjohn Company
InventorsBenjamin S. Ehrlich, Richard W. Oertel, III
Life of this patent
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AssigneeThe Upjohn Company
InventorsBenjamin S. Ehrlich, Richard W. Oertel, III
Estimating the term…
Improved thermoplastic polyurethane elastomers are disclosed which are the reaction product of 4,4'-methylene-bis(phenyl isocyanate); a polymeric diol; and an extender wherein the equivalent proportions of said diol to said extender fall within the range of about 1:2 to about 1:20 and the isocyanate to total hydroxyl equivalents are within the range of about 0.99:1 to 1.06:1, the improvement which comprises replacing at least about 15 percent by weight of said polymeric diol by a polyol selected from the class consisting of: (i) polyoxypropylene-polyoxyethylene glycols having a molecular weight of about 3500 to about 4500 and an ethylene oxide content of about 10 to about 60 percent by weight; (ii) polyoxypropylene-polyoxyethylene triols having a molecular weight from about 5000 to about 7000 and an ethylene oxide content of about 10 to about 40 percent by weight; and (iii) mixtures of (i) and (ii). The elastomers find particular utility in the manufacture of ski boots, hockey boots and automotive exterior panels, bumpers, fascia, and the like.
In a thermoplastic polyurethane elastomer which is the product of reaction of 4,4'-methylenebis(phenyl isocyanate), difunctional extender and a polymeric diol selected from the class consisting of (a) polyoxypropylene-polyoxyethylene copolymers having a molecular weight of from about 1000 to about 3000, and having a minimum content of ethylene oxide (E.O.) residues by weight for any given molecular weight (MW) corresponding to:
In a thermoplastic polyurethane elastomer which is the product of reaction of 4,4'-methylenebis(phenyl isocyanate), difunctional extender and a polymeric diol selected from the class consisting of (a) a 2000 MW polyoxypropylene-polyoxyethylene glycol having about 45 percent by weight of E.O. residues, (b) a 2000 MW polybutylene adipate, and mixtures of (a) and (b), the equivalent proportions of polymeric diol to extender being within the range of about 1:2 to about 1:20 and the ratio of equivalents of said isocyanate to total hydroxyl equivalents being within the range of about 0.99:1 to 1.06:1, the improvement which comprises replacing at least about 15 percent by weight of said polymeric diol by a polyoxypropylene-polyoxyethylene glycol having a molecular weight of about 3500 to about 4500 and an E.O. content of about 10 to about 60 percent by weight.
Dependencies are inferred from the claim text.