Magnetic recording material
AssigneeFuji Photo Film Co., Ltd.
InventorsHiroshi Ogawa, Masashi Aonuma, Yasuo Tamai
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Abstract
A magnetic recording material, and, more particularly, a high density magnetic recording material is disclosed having an aromatic polyamide support in which the adhesion between the support and the magnetic recording layer is improved by an undercoating of an alcohol-soluble polyamide resin.
Claims43
A magnetic recording material comprising a nonmagnetizable flexible support of an aromatic polyamide resin having provided thereon a magnetic recording layer containing a ferromagnetic fine powder dispersed in a binder, and between said support and said magnetic recording layer an alcoholsoluble polyamide resin layer, wherein said aromatic polyamide resin is a polyamide resin represented by the formulae (I) or (II):
- ##STR11## wherein R.sub.1, R.sub.2 and R.sub.3 each represents ##STR12## R.sub.4 represents ##STR13## and --S.sub.2 --, X and X' which may be the same or different each represents a hydrogen atom, a halogen atom and nitro group, and m and m' each is an integer of from about 100 to about 1,000, provided that the polyamide resin contains at least 70% p-arylene groups based on the total number of arylene groups in the resin;
- or a polyamide resin containing units of both the formulae (I) and (II) in a molar ratio of (I) to (II) of from about 1:9 to about 9:1.
Dependencies are inferred from the claim text.