Title: Magnetic recording medium

Abstract: A magnetic recording medium consisting of a base coated with a magnetic coating material, characterized in that the binder composition in said magnetic coating material is ternary, consisting of from 30 to 70% of a polyurethane resin having an --OH group in the terminal position, from 10 to 50% of an epoxy resin, and from 10 to 50% of a vinyl chloride-vinylidene chloride copolymer, all by weight on the basis of the total weight of the binder together with a curing agent. The magnetic recording medium exhibits superior electromagnetic properties and physical properties such as stability on repeated runs and bonding strength of the coating.

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Inventors: Hosaka, Akihiko (Saku, JP)
Tanaka, Kazushi (Saku, JP)

Application Number: 06/095648
Filing Date: 1979-11-19
Publication_date: 1982-05-11
Assignee: TDK ELECTRONICS CO LTD

Primary Class(es): 428/413 428/522, 427/128, 428/900, 252/62.540, 428/483, 428/8
Other Classes: C08K3/22; C08L75/04; G11B5/702; C08K3/00; C08L75/00; G11B5/68
US Patent Ref:

3247017	April, 1966	Eichler et al.	428/900	Magnetic recording tape for sound, image and pulse recording
3320090	May, 1967	Graubart	428/900	Phenoxy-polyurethane magnetic tape binder
3650828	March, 1972	Higaohi et al.	252/62.54	MAGNETIC COATING FORMULATION FOR RECORDING TAPE
3689317	September, 1972	Akashi et al.	428/900
3740266	June, 1973	Akashi et al.	428/900
3840400	October, 1974	Yamada et al.	428/900	MAGNETIC RECORDING MEMBER
3911196	October, 1975	Navidad	428/425.9	Magnetic tape binder system

Other Refs: JP53-11443JP55-5176SU661600

April, 1978	427/128
February, 1980	427/128
May, 1979	428/900

Primary Examiner: Silverman, Stanley S.
Assistant Examiner:
Attorney: Wyatt, Gerber, Shoup, Scobey & Badie

Claims: