Sulfur-modified copolyether glycols, a method for preparing them, and polyurethanes prepared therefrom
AssigneeE. I. Du Pont de Nemours and Company
InventorIvan M. Robinson
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Abstract
Copolyether glycols are modified so that they contain 1-25%, by weight of .beta.,.beta.'-dihydroxyalkyl sulfide moieties. These modified copolyether glycols have enhanced resistance to degradation by heat and oxygen. The invention also relates to a method of making the modified copolyether glycols, to their use as stabilizers against the degradation of the polyether chains, and to polyurethanes made with them.
Claims12
A copolyether glycol modified so that it contains in its chain 1-25%, by weight, of moieties represented by the structure ##STR3## where R is hydrogen, an alkyl radical of 1-3 carbon atoms or phenyl, and the oxygen atom is linked to a hydrogen atom or a carbon atom.
Dependencies are inferred from the claim text.