Oxymethylene polymer molding compositions having enhanced impact resistance and article molded therefrom

摘要

Articles molded from oxymethylene polymer molding compositions of the present invention exhibit enhanced impact strength properties, especially at low temperatures such as -20 DEG F. It has now been found that the impact strength of articles molded from oxymethylene polymer molding compositions may be improved when the compositions include an elastomeric polyurethane, which is the reaction product of: (i) 4,4'-methylenebis(phenyl isocyanate), (ii) polyoxytetramethylene glycol having a molecular weight within the range of about 1500 to about 3000, and (iii) at least one diol extender selected from the group consisting of aliphatic straight chain diols having from 2 to about 6 carbon atoms, bis(2-hydroxy-ethyl) ether of hydroquinone, and bis(2-hydroxy-ethyl) ether of resorcinol.