FORMALDEHYDE-FREE INSOLUBILIZERS FOR BINDERS FOR PAPER COATING COMPOSITIONS

摘要

FORMALDEHYDE-FREE INSOLUBILIZERS FOR BINDERS FOR PAPER COATING COMPOSITIONS A highly efficient formaldehyde-free coating composition insolubilizer is prepared by reacting about 3 moles of glyoxal with 1 mole of urea resulting in a formation of a low molecular weight oligomer in a yield of 95 - 96%. The molar ratio of glyoxal to urea is very critical in obtaining the highest efficiency and is kept within narrow limits. The coating compositions of the present invention possess 2 till 4 times higher wet-rub resistance than the prior art compositions.