Patent ID: 8748557
Filing Date: 2014-06-10
Classification: C08G,C08L

Abstract:
1. A UF resin produced from formaldehyde, urea, a long chain prepolymer with multi-aldehyde groups, caustic catalyst, and acid catalyst according to the following proportion: 37% formaldehyde: 154-170 weight parts, urea: 120 weight parts, the long chain prepolymer: 10-100 weight parts, the caustic catalyst: 0.02-0.05 weight parts, and the acid catalyst: 0.02-0.05 weight parts, wherein molecular chains of the UF resin contain first units formed from formaldehyde and urea and second units formed from the long chain prepolymer with multi-aldehyde groups, and the mole ratio of formaldehyde to urea is in the range of 0.95-1.05; wherein the long chain prepolymer with multi-aldehyde groups is synthesized from glyoxal and glutaraldehyde or from glutaraldehyde itself by reacting a mixture of glyoxal and glutaraldehyde or glutaradehyde itself in the presence of a catalyst.