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:
Jan. 22, 1980
Filed:
Aug. 30, 1976
Werner Flakus, Recklinghausen, DE;
Josef Disteldorf, Herne, DE;
Veba-Chemie Aktiengesellschaft, Gelsenkirchen-Buer, DE;
Abstract
An improvement in a process for the preparation of a solvent-free exclusively aqueous dispersion of a thermally linkable, storage stable, light stable polyurethane obtained by the reaction of a hydroxy group containing polyester composition and a diisocyanate in a ketonic solvent at 10.degree.-50.degree. C. employing the hydroxyl containing polyester and diisocyanate in amounts such that there are 1.5-2.0 NCO equivalents per OH group and the reaction product is thereafter reacted with a primary diamine, secondary diamine or diol in such an amount that 30-70% of the existing free NCO groups on said reaction product are reacted and the resultant reaction product is dispersed in water and said ketonic solvent is removed. The invention resides in that one uses as diisocyanate the uretdione of the 3-isocyanatomethyl-3,5,5-trimethylcyclohexyl-isocyanate.