GB742046A - Improvements in or relating to resinous compositions and the manufacture thereof - Google Patents

Abstract

A curable resinous composition comprises a compatible blend of (1) an uncured substantially unalkylated resinous product of reaction of (A) an aldehyde and (B) a 4,6-diaminotriazine, wherein the amino groups attached to the carbon atoms in the 4- and 6-positions are unsubstituted and the carbon atom in the 2-position has attached thereto a radical selected from (a) aliphatic hydrocarbon radicals containing from 3 to 9 carbon atoms, inclusive; (b) cycloaliphatic hydrocarbon radicals; (c) aralkyl radicals; and (d) mono- and di-substituted amino radicals, the radicals of (b), (c) and (d) having not more than 10 carbon atoms and the substituent or substitutents attached to the nitrogen atom of the amino grouping of (d) being any of those defined in (a) to (c), inclusive, and, in addition, aryl radicals having not more than 10 carbon atoms, the aldehyde of (A) and the 4,6-diaminotriazine of (B) being employed in a molar ratio of 1 : 1 to 4 : 1 and caused to react at a temperature of from 60 DEG to 200 DEG C. until a condensation product is formed, a 50 per cent solution of which in ethyl alcohol is stable at 20-25 DEG C. for at least 5 hours, the reaction not being allowed to proceed beyond the point where the condensation product has a plasticity of about 60 mils as determined by a test described, and (2) from 10 per cent to 50 per cent, based on the total weight of (1) and (2), of an alkyd resin which is compatible with the resin of (1). (A) may be an aldehyde or a substance yielding an aldehyde such as formaldehyde, paraformaldehyde, acetaldehyde, propionaldehyde, valeraldehyde, furfural, trioxane, paraldehyde and benzaldehyde. (B) may be n - butyroguanamine, isobutyraguanamine, methacryloguanamine, sorboguanamine, n-valeroguanamine, caproguanamine, heptanoguanamine, capryloguanamine, 4 - ethyl - 2-octenoguanamine, D 3 - tetrahydrobenzoguanamine, hexahydrobenzoguanamine, 3-methyl - D 3 - tetrahydrobenzoguanamine, 3-methyl - hexahydrobenzoguanamine, 3,4-dimethyl - D 3 - 1,2,5,6 - tetrahydrobenzoguanamine, 3,4 - dimethylhexahydroguanamine, phenylacetoguanamine, tolylacetoguanamine, N - butyl melamine, N - phenyl melamine, N-tolylmelamine, N - cyclohexylmelamine, N,N-diallylmelamine, or N,N - dibenzylmelamine. The alkyd resin may be prepared from malonic, succinic, glutaric, sebacic, adipic, pimelic, suberic, azelaic, tricarballylic, citric, tartaric, malic, phthalic, terephthalic, maleic, fumaric, itaconic, mesaconic or fumaric acid and a polyhydric alcohol such as ethylene glycol, diethylene glycol, dipropylene glycol, tetramethylene glycol, pinacol, trimethylol propane, trimethylol ethane, mannitol, dulcitol, sorbitol, glycerol, pentaerythritol and dipentaerythritol, and may be oil-modified. The resin compositions are useful for the production of surfaces on decorative laminates to which they may be applied in solution in ethanol, isopropanol, butanol or methyl ethyl ketone or in mixtures of an alcohol and an aromatic hydrocarbon or of a ketone and an aromatic hydrocarbon. Other materials which may be incorporated in the composition include ochre, carbon black, malachite green, Prussian blue, ultramarine, zinc oxide, ferric oxide, zinc sulphide, titanium dioxide, cellulosic and glass fibres, asbestos, and a curing catalyst such as benzoic, salicylic, phthalic or hydrochloric acid. Specification 533,997 is referred to.