Polythetics, Inc.

Other

Adolfas Damusis

Kurt C Frisch

Ralph W Colpitts

A method for producing a urethane elastomer is disclosed. The method involves mixing benzotriazole or a tolyl triazole with an isocyanate terminated prepolymer while the prepolymer is at a temperature sufficiently high that it is a liquid. The proportion of benzotriazole or tolyl triazole used can range from 0.1 to 1.0 equivalent per equivalent of isocyanate in the prepolymer, and must be sufficient to increase the pot life of a mixture of the prepolymer with a diamine, but insufficient to cause substantial impairment of the physical properties of the cured elastomer. A substantially equivalent amount of a diamine is then mixed with the stabilized prepolymer, and the resulting composition is heated to produce the elastomer.

Polyurethane elastomer produced by reaction between a

A denture consisting of teeth anchored in a gum member composed of a unitary mass of non-hydrophilic polyurethane elastomer, the tooth-holding portion of which is hard and the mouth-engaging portion of which is soft is prepared by first casting the teeth-holding portion about the teeth and then casting the gum holding portion onto the tooth-holding portion and curing the denture during which the gum-engaging portion and the tooth-holding portion become integrally chemically bonded into a unitary mass.

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Southfield, MI, United States of America

Adolfas Damusis