E.i. Dupont De Nemours and Company

William L Evans

Charles W Goodrich

Polyhydroxy urethanes prepared from reduced sugars of the formula C.sub.x H.sub.2(x+1) O.sub.x where x is 4, 5 and 6 and diisocyanates are disclosed. There is a molar excess of 1.5 and preferably 2.0 of the reduced sugar in the polyhydroxy urethane product and the molecular weight of the product is generally less than 1,500 and preferably less than 1,000.

Polyhydroxy urethanes formed by reaction of reduced sugars and organic

An improved spandex polymer composition provides fibers or films of the composition with increased heat set efficiency and greater discoloration resistance. The composition contains zinc oxide and a polyhydroxy additive selected from certain sugars, reduced sugars and/or polyhydroxy urethanes formed from these sugars or reduced sugars and an organic diisocyanate.

Discoloration-resistant spandex

A process for preparing alkylanthrquinones wherein the alkyl group contains from 2 to 5 carbon atoms such as 2-ethylanthraquinone, 2-t-amylanthraquinone or 2-t-butylanthraquinone by ring closure from the corresponding alkylbenzoylvenzoic acid is disclosed. The process involves adding a solution of the alkylbenzoylbenzoic acid to 100% concentrated sulfuric acid or up to 12% oleum, distilling off the solvent at from 20.degree. to 60.degree. C., heating the remaining solution to from 80.degree. to 95.degree. C. and preferably from 83.degree. to 87.degree. C. for 3 to 5 hours, diluting the remaining reaction mixture with water and separating the alkylanthraquinone product.

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Turnersville, NJ, United States of America

William L Evans