Patent ID: 6632262
Filing Date: 2003-10-14
Classification: C05C,C05G,C08G

Abstract:
A urea-formaldehyde resin prepared by the method comprising: combining formaldehyde, urea, and ammonia in a basic solution at a formaldehyde/urea/ammonia ratio of about 0.6-1.0/1/0.25-0.35;heating the solution to about 85 to about 95Â° C., and holding while maintaining pH between about 7.5 and 10.5 for about 45 to 120 minutes; cooling the solution to less than about 50Â° C., and adjusting the pH to about 9.5 to about 10.5; wherein the nitrogen content of the resin is at least about 28 wt % based on 100% resin solids, the triazone content of the resin is 14 to 20 wt %, and about 50-60 wt % of the nitrogen is controlled release and about 40-50 wt % of the nitrogen is quick release.