Amino plast adhesive with low initial adhesion - the bond being established by heat, suitable for wood working

摘要

The adhesive, which is used for cold prebonding wood, is given improved holding power by the addition to the adhesive of 0.05-10% a soln. of boric acid in a mono- or polyacidic amine (I). The soln. is obtd. by dissolving sufficient boric acid in the liquid amine to give =1 equiv. amine per 3 mole H3BO3. (I) include (poly)acidic aliphatic amines, 1 degree, 2 degrees or 3 degrees amine (mixt.), with 1-20C, (pref. 1-10C). The agent is suitable for adhesives such as phenol or amino resins or their condensate mixts., and polymers or copolymers of vinyl acetate, vinyl propionate, vinyl chloride, their acrylic acid ester, vinyl ether, or styrols. It is suitable for most synthetic glues, and adhesives, and fillers. Prepressing times are shortened, and improved stability of the adhesively bonded chips is obtd.