Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From reactant having at least one -n=c=x group as well as...
Patent
1982-04-26
1983-04-12
Welsh, Maurice J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From reactant having at least one -n=c=x group as well as...
528 76, 528 77, 528 80, 528 83, C08G 1848
Patent
active
043799043
ABSTRACT:
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.
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Ehrlich Benjamin S.
Oertel, III Richard W.
Firth Denis A.
Rose James S.
The Upjohn Company
Welsh Maurice J.
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