公开(公告)号：GB1153453A

公开(公告)日：1969-05-29

申请号：GB4324766

申请日：1966-09-28

Applicant: BASF AG

Inventor： SCHNELL GEORGE ,  HARTMANN JOB-WERNER ,  STEUERWALD MANFRED ,  KITTLER WOFFRAM

IPC: C09D5/23 ,  G11B5/702

Abstract: 1,153,453. Magnetic compositions. BADISCHE ANILIN- & SODA FABRIK A.G. 28 Sept., 1966 [29 Sept., 1965], No. 43247/66. Heading H1H. In the production of magnetic recording media by applying a suspension of ferromagnetic powder in a solution of a linear polyamide on to a backing, the applied layer contains 10-150% by weight (referred to the polyamide) of a soluble condensation product of an aliphatic monocarboxylic acid having 4-22 carbon atoms, and an aliphatic hydroxyamine having at least one primary or secondary amino group, a molecular wt. of below 500, and, e.g., 2-18 carbon atoms. The layer is then dried and heated above the softening point of the polyamide, e.g. at 50-110‹ C. Suitable acids are butyric, caproic, caprylic, capric, lauric, tridecanoic, palmitic, stearic, nonadecylic, sorbic, linoleic, oleic, and sperm or linseed oil fatty acid. Suitable hydroxyamines are 3-hydroxypropylamine, 2-aminoethanol, N - methyl - 2 - aminoethanol, N - hydroxyethyl - 2 - aminoethanol, 2 - aminobutanol, 2- amino - 2 - methyl - propanol, 3 - amino - 2 - hydroxy - propanol, diethanolamine monomethylether, N,N 1 - di - 2 - hydroxyethylethylenediamine, N,N 1 - di - 2 - hydroxyethylpropylenediamine. Equimolar amounts may be used. Suitable polyamide-forming materials, solvents, plasticizers, dispersing agents, and backings are listed. 400-650 pts. by wt. of powder, e.g. acicular γ-Fe 2 O 3 , Fe 3 O 4 , or Fe, may be used per 100 pts. polyamide.