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:
Jul. 01, 1986
Filed:
Jun. 05, 1985
Applicant:
Inventors:
Assignee:
Chemische Werke Huls AG, Marl, DE;
Primary Examiner:
Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
524874 ; 4273855 ; 528 61 ;
Abstract
A method for preparing an aqueous polyurethane dispersion, comprising (a) preparing a prepolymer with free NCO groups by reacting an aliphatic or cycloaliphatic polyisocyanate with a polyol, and an anionic compound; (b) dispersing said prepolymer in water; (c) reacting said water-dispersed prepolymer with a diamino hydrazide of the formula: ##STR1## wherein R is an alkylene group of 2 to 15 carbon atoms or a cycloalkylene or arylene group of 6 to 15 carbon atoms as a chain lengthening agent; (d) reacting the prepolymer of step (c) in said dispersion with formaldehyde to effect crosslinking.