Abstract:
Top coatings of polyamino acids adhere firmly to plasticized polyvinyl chloride over a primer of an elastomeric polyurethane prepared from a urethane prepolymer having available NCO groups and a chain extender having active hydrogen if the isocyanate moiety of the prepolymer or the chain extender contains at least one cyclohexane ring. The primer also prevents plasticizer migration.
Abstract:
A gas-permeable, leather-like material is obtained by coating a fibrous base with a heterogeneous mixture of a liquid and two polymers, or by impregnating the base material with the mixture, and thereafter drying the coated or impregnated material until the liquid is removed. The two polymers are a polyamino acid and an elastomer respectively, at least one of the polymers being present in the mixture as a separate, dispersed phase.