Reinforced with melamine to UF Adhesives to 0.9 melamine for the production of Medium Density plates Bonded

摘要

A process for the production of melamine Urea formaldehyde Resins with up to 0.9% melamine for reaction of urea containing: (a) 0 to 10% by weight of one or more Compounds, formaldehyde and melamine in the presence of a base to a pH value of 7.5 to 11, a temperature 2 0 to traditonal and a pressure of 0.1 to 10 bar(b) after reaction in the presence of an Acid, optionally containing urea with 0 to 10% by weight of one or more Compounds, at a temperature of 60 to 180 and a pressure of 0.1 to 10 bar c) and subsequent addition of urea, which contains 0 to 10% by weight of one or more compounds Where B ) is carried out at a pH value of 4 to 5.9.