GB629408A - Improvements in or relating to methods of preparing an artificial, thermosetting resin and the improved resin resulting therefrom - Google Patents

Abstract

Thermosetting synthetic resins are prepared by heating 1 to 1.8 mols. of furfuryl alcohol or partially resinified furfuryl alcohol, 1 mol. of an amino triazine and 2-6 mols. of an aldehyde, with or without a catalyst, e.g. maleic anhydride, phosphoric acid, oxalic acid or aniline hydrochloride. The amino triazine may be melamine, ammeline, ammelide, 2-amino-1,3,5-triazine, formoguanamine and its substitution products, 2 - phenyl - 4 - amino - 6 - hydroxyl-1,3,5 - triazine, 2 - chloro - 4,6 - diamino - 1,3,5-triazine, 2 - methyl - 4 - amino - 6 - hydroxyl-1,3,5 - triazine, 2 - methyl - 2,4 - diamino-1,3,5 - triazine, 2,4,6 - triethyltriamino - 1,3,5-triazine, 2,4,6 - triphenyltriamino - 1,3,5-triazine and the aldehyde may be formaldehyde, acetaldehyde, furfural, benzaldehyde. Dimethylol urea may be added as a modifier and the condensation products may be reacted with aldehydes or ketones. In the examples: furfuryl alcohol or a resin formed by heating it alone or with acid catalysts is heated with (1-5) melamine and formaldehyde. The products may be used alone or with other resins and, if desired with fillers such as wood flour or asbestos for coating, impregnating, laminating, e.g. of wood or paper sheets, or moulding. They are soluble in solvents such as acetone-water, dioxane - water, and ethylene glycol monomethyl ether. In example 6 dimethylol urea is also included in the reaction mixture. Specifications 486,519 and 486,577 are referred to.