Patent ID: 8444805

Claim:
A two-component adhesive system comprising: adhesive component I comprising in dry wt % relative to the total weight of adhesive component I for components Ia)-I.c): I.a) 50-70 wt % of a melamine-formaldehyde MF type resin and I.b) 0-20 wt % of organic or inorganic filler, I.c) 0-10 wt % of further additives, I.d) 25-40 wt % water; adhesive component II comprising in dry wt % relative to the total weight of adhesive component II for components II.a)-II.f): II.a) 20-40 wt % of a water based dispersion adhesive, II.b) 0-10 wt % of a thickener, II.c) 15-40 wt % of a formaldehyde scavenger, II.d) an acidic compound in an amount such that the pH of adhesive component II is 1.5-6.5, II.e) 0-20 wt % of organic or inorganic filler, II.f) 0-10 wt % of further additives, II.g) 25-40 wt % water, and wherein adhesive component I and II are to be applied in a weight ratio I:II of 1:0.5 to 1:1.5, and the adhesive system has a molar ratio of formaldehyde to total amino group between 0.2 and 0.7; and wherein the formaldehyde scavenger II.c) is an amino-compound selected from the group consisting of: urea, thiourea, amines, and ammonia; and wherein the MF type resin (I.a) is either MF resin (the reaction product of substantially pure M and F) or urea modified MF resin (uMF) comprising urea in a relatively small amount or modified MF or uMF resins.