PRODUIT FORME DE FIBRES DE VERRE ET D'UN LIANT THERMODURCISSABLE ET PROCEDE DE PREPARATION D'UN TEL PRODUIT

摘要

An improved method is disclosed for effecting environmental control in the production of a binder-coated fiber and fiber products. Heat-softened material is attenuated into fibers, cooled to a maximum temperature of about 350 DEG F., coated with a binding agent, collected on a suitable conveyor, and heated in an oven to cure the binder. The binding agent is a phenol-aldehyde type resin which has been condensed to an advanced stage such that the condensate is water-insoluble at a pH of 7.5. The condensate is solubilized by adding a small amount of a non-ionic or anionic agent.