Akzona Incorporated

David A Johnson

Kenneth B Wagener

Robert L Lilly

Ronald W Worley

Robert L Gilly

The use of aluminum sulfate as a dessicant for drying the starting materials used in polymerization reactions employing readily hydrolyzable catalysts is disclosed. The aluminum sulfate is allowed to remain in the reaction mixture during polymerization, and, indeed, may advantageously be allowed to remain in the reaction product without any deleterious effect.

Method for the prevention of hydrolysis of polyesterification catalysts

Polyester/polyether segmented copolymers are stabilized against degradation by UV light via copolymerization with novel diesters and/or bis-hydroxyalkyl terminated derivatives of 2,2,6,6-tetramethylpiperidines.

Polyester/polyether segmented copolymers stabilized against degradation

There is disclosed a method for minimizing ozone fading in dyed polyamides by treating the dyed polyamide with a substituted piperidine thiourea of the formula ##STR1## where R is a lower alkyl radical having 1-5 carbon atoms or phenyl. The treated dyed polyamides, preferably in fiber form, display minimize ozone fade without a reduction in light stability.

Minimizing ozone fading in dyed polyamides by treating same with

This invention relates to polyester polyether segmented copolymers wherein the polyether segment contains a certain amount of heterocyclic ring repeat units, for example, the hydantoin ring. These polyester polyether segmented copolymers are useful in the production of fibers, films or other extrusion moldings where elastomeric properties are desirable.

Growing community of inventors

Norton, MA, United States of America

David A Johnson