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:
Aug. 18, 1981
Filed:
Jun. 20, 1980
Charles J Amirsakis, Lake Geneva, WI (US);
Morton-Norwich Products, Inc., Chicago, IL (US);
Abstract
Thermoplastic polyurethane compositions having excellent mechanical and thermal properties, high hardness and the capabilty of binding or adhering to magnetic pigments, formed by reacting 1,4-cyclohexanedimethanol with a dicarboxylic acid such as adipic, azelaic or 1,12-dodecanedioic acid, or mixtures thereof in a hydroxyl number range of from about 50 to about 250 to form a hydroxyl-terminated polyester, combining the polyester so formed with a chain extender to form a mixture in a hydroxyl number range of from about 130 to about 300 and reacting said mixture with a diisocyanate to form the polyurethane resin. Such polyurethanes display excellent binding properties for adhering magnetic iron oxide or other magnetic pigments to flexible substrates to form magnetic tape.