Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1987-02-06
1989-01-31
Kight, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524 13, 524 14, 524 15, 524 16, 524 17, 524 21, 524 25, 524 26, 524 27, 524 37, 524 47, 524 49, 524 72, 156328, 156336, C08L 3104, C08L 7500
Patent
active
048016314
ABSTRACT:
This invention relates to formaldehyde-free, aqueous glue dispersions which contain polyisocyanates. These systems are particularly suitable for gluing veneers and surface materials on wood and wood products. The systems are prepared from polyisocyanates in combination with extenders based on flours and cold water-soluble of hydrolyzed natural starch. In this process, polyisocyanates or aqueous dispersions thereof are added while stirring to aqueous solutions or mixtures of starch and flour.
The extender-containing adhesive systems are aqueous glue dispersions having increased service life which in their preferred embodiment contain about 15 to 30% by weight of polyisocyanates, preferably polyphenyl-polymethylene polyisocyanate (PMDI), 10 to 15% by weight of starch which is soluble in cold water and 14 to 25% by weight of (cereal) flour and optionally, other additives and the appropriate quantity of water adding up to 100% by weight. The glue dispersions are easily applied with glue spreading machines and if applied in suitable quantities do not bleed through veneers. The implements used for applying the glues can easily be cleaned by rinsing them with water.
The invention is also directed to the use of the glue dispersions for gluing, particularly for gluing veneers or other surface coating materials to wood or wood products.
REFERENCES:
patent: 4209433 (1980-06-01), Hse
patent: 4396738 (1983-08-01), Powell et al.
patent: 4433095 (1984-02-01), Hombach et al.
W. Hackbarth and W. V. Bockelmann, "Dispersions-Isocyanatsysteme: Neue Klebstoff-Generation fur die Holzindustrie", Adhasion 11, 1982.
O. Wittman and H. Lehnert, "Diisocyanate als Bindemittel", Holz-Zentralbatt, No. 59, May 17, 1974.
Larimer Donald R.
Sachs Hanns I.
Bayer Aktiengesellschaft
Gil Joseph C.
Harsh Gene
Kight John
Nutter Nathan M.
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