Magnetic recording medium

Abstract

Abstract PURPOSE:To enhance dispersibility of a magnetic powder by successively coating the surface of the magnetic powder with polyisocyanate and aliphatic amine. CONSTITUTION:A magnetic recording medium is prepared by feeding a kneader with 100pts.wt. Co-deposited alpha-Fe2O3, stirring it in reduced pressure, spraying 3pts.wt. of ethyl acetate soln. of toluene diisocyanate on the surface of said Fe2O3 with a spray gun, further continuing stirring and kneading, again spraying 5pts.wt. of ethyl acetate soln. of stearylamine likewise, stirring and kneading at 50 deg.C, after that, washing the obtained powder, coating the dried surface with toluene diisocyanate and stearylamine in succession, dispersing a liquid prescribed compsn. contg. 100pts.wt. of the obtained. Co-coated alpha-Fe2O3 (1) thus covered, etc. in a ball mill, coating a polyester film with said liquid with a blade in a dried thickness of 3mum blade, and drying to form a magnetic layer.

Inventors

• 👤 Sho Naruse
• 👤 成瀬　省
• 👤 Akira Ichikawa
• 👤 晃 市川
• 👤 Kazuo Kato
• 👤 一男 加藤
• 👤 Yukio Konagaya
• 👤 行夫 小長谷

Bibliographic Details