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:
Mar. 16, 1982
Filed:
May. 19, 1980
Herbert Motz, Beindersheim, DE;
August Lehner, Roedersheim-Gronau, DE;
Heinrich Hartmann, Limburgerhof, DE;
Rudolf Bachmann, Frankenthal, DE;
Hans-Joerg Hartmann, Feinsheim, DE;
Harald Frischmann, Willstaett, DE;
Roland Falk, Achern, DE;
Joachim Hack, Ludwigshafen, DE;
Milan Velic, Ludwigshafen, DE;
Helmut Kopke, Ludwigshafen, DE;
BASF Aktiengesellschaft, , DE;
Abstract
Magnetic recording media comprising a non-magnetic base and, applied thereto, a firmly adhering magnetic coating based on a finely divided magnetic pigment dispersed in a binder which contains at least 50 percent by weight of a special polyurethane elastomer, namely a thermoplastic polyurethane which is soluble in tetrahydrofuran, is free from isocyanate groups and has been manufactured from (A) 1 mole of a hydroxyl-containing polyester having a molecular weight of from 700 to 2,500, (B) from 0.3 to 3 moles of a linear aliphatic diol of 2 to 10 carbon atoms, (C) from 0.05 to 0.4 mole of a triol of 3 to 10 carbon atoms, and (D) from 1.35 to 4.7 moles of a diisocyanate of 6 to 30 carbon atoms, the amount of NCO groups being approximately equivalent to the amount of OH groups of the sum of components (A) to (C).