Patent ID: 7807749

Claim:
A curable aqueous composition for bonding lignocellulosic material comprising: (a) a hydroxy-containing polymer; (b) a multi-functional crosslinking agent which is a multifunctional aldehyde selected from the group consisting of glyoxal or glutaraldehyde, wherein the multifunctional aldehyde is blocked by reaction with a blocking agent before adding to the curable aqueous composition, and wherein the blocking agent is at least one selected from the group consisting of urea, and ethylene urea and optionally (c) a catalyst; wherein the weight ratio of (a):(b) is from 95:5 to about 10:90, and wherein the multi-functional crosslinking agent is in a concentration of at least 25 wt % based on the weight of the solids content in the curable aqueous composition.