GB468677A - Manufacture of aldehyde condensation products - Google Patents

Abstract

Non-resinous condensation products are prepared by reacting aminotriazines or derivatives thereof containing at least one replaceable hydrogen atom with formaldehyde or substances yielding it. Suitable aminotriazines include melamine, melam, melone, ammelin, ammelide, 2 : 4-diamino-1 : 3 : 5-triazine (formoguanamine), 2-(p-oxyphenyl)-4 : 6-diamino-1 : 3 : 5-triazine, 2-phenyl-4-amino-6-oxy-1 : 3 : 5-triazine, derivatives of melamine in which a part of the amino-groups or the hydrogen atoms thereof has been exchanged for other groups or atoms such as hydrogen, halogen, aryl, alkyl or aralkyl groups such as the symmetrical triarylmelamines, di- and trialkylmelamines or aralkylmelamines. Derivatives of the isoaminotriazines wherein the hydrogen attached to the cyclic nitrogen atoms has been replaced may also be used. Other substances capable of forming resins with aldehydes such as phenol, urea, thiourea and aniline may be present during the condensation, may be added to the initial condensate, or their condensates with aldehydes added to the aminotriazine aldehyde condensate. Dyestuffs, fillers, plasticizers and water-repelling agents may be added at any stage. The condensation may take place in the presence of water, organic solvents, mixtures of water and organic solvents such as ethyl alcohol, butyl alcohol, glycerides of linseed oil fatty acids or aqueous alcohol. Acid or alkaline condensing agents may be used. The products may be used as binding in the production of moulded or laminated products; as adhesives especially in the wood-working industry and the manufacture of plywood; in the textile industry for dressing, anti-creasing and matting; and as lacquer binding agents or as additions to lacquers. In examples: (1) melamine is condensed with neutral formaldehyde solution to yield a crystalline methylol compound which in an acid aqueous solution may be used as an impregnating agent; (2) melamine is condensed with neutral aqueous formaldehyde solution to yield a solution; (3) a methylolmelamine solution is obtained by reacting melamine and neutral aqueous formaldehyde. A sample has been furnished under Sect. 2(5) of a condensation product prepared from formaldehyde and 3-amino-1 : 2 : 4-phentriazoxine. Specifications 466,015 and 466,096 are referred to.