Abstract: A system for the retention of finely divided solid catalysts inside a continuously stirred back-mixed reactor is presented. The system includes multiple porous media filter elements and multiple reactor baffles. The porous media filter elements are located to act as part of said reactor baffles. The porous media is selected to retain the large majority of the catalyst particles while allowing the reacted contents to leave the reactor through the pores of the porous media. The porous media elements may have a circular cross-section. The system utilizes the pumped flow of the reactor's agitator system to sweep solids from the porous media, and a high velocity zone is created around the back side of the porous media filter elements by a venturi effect caused by design and placement of the baffles and the porous media elements.

Abstract: A method for producing transparent or pigmented films from resin particles, of a particular class of laurolactam containing polyamide copolymers and/or terpolymer, said film suitable as a coating and/or heat melt adhesive for fabrics and other materials. The method comprises drying the resin while in the solid state until it is substantially water free, extruding the dried resin particles while heating to a temperature sufficient to volatilize and drive off unreacted monomer contaminants, but below the degradation temperature of the resin, expelling the molten resin from the extruder onto heated, sheeting dye means to form a film therefrom, dropping the film onto a substrate backing material, and running the film and backing through a roller to achieve a uniform and controlled thickness.