close to 9 u2013 9 5 an adjustment in ph if necessary could be made with as much sodium hydroxide at 20 as necessary after 2 hours of reaction 13 g of a 50 aqueous glyoxylic acid solution 0 09 mole and 50 g of dextrose 0 3 mole supplier acros were added and the mixture was heated under agitation at a temperature of about 55 u2013 60 u00b0 c for 1 hour and cooled then 127 2 g of water was added to the mixture a yellow viscous liquid was obtained having a content in active solids of approximately 60 and a brookfield viscosity of 136 mpa s measured after 24 hours this resin presented a content of free glyoxylic acid of 0 06 analysis by hplc after passage on exchanging cartridge of anions then by using a rezex u2122 column 00h 0138 ko 300 7 8 mm and sulfuric acid 0 05 n as eluant with a flow of 0 5 ml min and an uv detection at 210 nm the resin was prepared as in the example 1 but using 0 22 mole of glyoxylic acid for 1 35 mole of melamine a yellow viscous liquid was obtained with.