Formaldehyde-free insolubilizers for binders for paper...

Details Formaldehyde-free insolubilizers for binders for paper... Formaldehyde-free insolubilizers for binders for paper...

C - Chemistry, Metallurgy

08

G

400/1203, 400/13

C08G 12/12 (2006.01) C09D 161/24 (2006.01) D21H 19/62 (2006.01)

Patent

CA 1221190

FORMALDEHYDE-FREE INSOLUBILIZERS FOR BINDERS FOR PAPER COATING COMPOSITIONS ABSTRACT OF THE DISCLOSURE 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.

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