The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 03, 1988
Filed:
Oct. 31, 1986
Chiaki Abe, Ichikai, JP;
Hiroyuki Kanai, Utsunomia, JP;
Akira Ishikawa, Utsunomia, JP;
Shigetoshi Suzue, Wakayama, JP;
Takashi Takeuchi, Utsunomia, JP;
Takahide Minami, Ichikai, JP;
Kao Corporation, Tokyo, JP;
Abstract
A magnetic recording medium comprises a support the magnetic layer and a magnetic layer, coated on said support, comprising magnetic powder, a binder, (I) an ester compound having the formula: ##STR1## in which R1 and R2 are each a saturated alkyl group having 1 to 25 carbon atoms, branched or straight, the total carbon number of R1 and R2 being from 22 to 34, and R3 is a saturated or unsaturated alkyl group having 7 to 29 carbon atoms, branched or straight, and (II) an ester compound having the formula: ##STR2## in which R4 is an aliphatic hydrocarbon group having 1 to 29 carbon atoms, straight or branched, and R5 is an aliphatic hydrocarbon group having 1 to 23 carbon atoms, straight or branched, or a straight aliphatic hydrocarbon group having 24 to 36 carbon atoms, the total carbon number of R4 and R5 being 15 to 65. Alternatively, the ester (II) compound can be replaced by an aliphatic acid having from 8 to 30 carbon atoms. The magnetic layer comprising compounds (I) and (II) may also include an aliphatic acid having from 10-30 carbon atoms.