Magnetic composition for deposit on sound recording tape or motion picture film

Abstract

Abstract A COMPOSITION ADAPTED FOR PRODUCING AN MAGNETIC RECORDING MEMBER SUCH AS TAPE OR STRIPED MOTION PICTURE FILM WHEREIN A LAYER OF FERROMAGNETIC PARTICLES IS BOUND ON A SYNTHETIC RESIN WEB BY A BINDER. THE COMPOSITION COMPRISES FERROMAGNETIC PARTICLES AND RESINOUS BINDER PHASE CONSISTING ESSENTIALLY OF, IN PERCENT BY WEIGHT 20% TO 80% OF CELLULOSE NITRATE IN INTIMATE MIXTURE WITH 80% TO 20% OF A POLYMERIC COMPOSITION CONSISTING ESSENTIALLY OF, BY WEIGHT, 50-80% VINYLIDENE CHLORIDE, 2-30% ACRYLONITRILE AND 0-60% OF A LOWER ALKYL UNSUBSTITUTED OR HYDROXY SUBSTITUTED ACRYLIC ESTER OR METHACRYLIC ESTER SUCH AS METHYL METHACRYLATE OR ACETYLATE OR HYDROXY PROPYL METHACRYLATE. THIS BINDER IS ESPECIALLY GOOD FOR POLY(ETHYLENE TEREPHTHALATE) WEBS. BEST ADHERENCE TO A WEB IS SECURED WHEN THE FERROMAGNETIC PARTICLES AND THE ABOVE BINDER ARE DEPOSITED FROM AN ORGANIC SOLVENT WHEREIN AT LEAST 8% OF THE SOLVENT IS A LOWER N,N-DIALKYLAMIDE OF A LOWER ALIPHATIC ACID SUCH AS N,N-DIMETHYL FORMAMIDE OR ACETAMIDE.

Inventors

• 👤 R Stimson

Bibliographic Details