GB611012A - Manufacture of esters of aminotriazine-formaldehyde condensation products - Google Patents

Abstract

Esters of aminotriazine formaldehyde condensation products are prepared by heating a condensation product, containing the maximum possible number of methylol groups at least the greater part of which are etherified with an aliphatic monohydric alcohol containing 1-5 carbon atoms, with more than 1/5 mol. of an organic acid or esterifiable derivative thereof per mol. of aminotriazine. The highly etherified product may be obtained by the process of Specifications 543,360 and 611,013. Preferably the heating is performed under reduced pressure to facilitate removal of volatile products. Suitable aminotriazines are melamine, melam, melem, mellon, ammelin, ammelide, formaguanamine; 2-chloro-4,6-diamino-1,3,5-triazine. Preferred alcohols for the etherification are methyl, ethyl, propyl, butyl or amyl. Suitable acids are fatty acids, aromatic acids, e.g. benzoic, abietic acid, colophony, or naphthenic acids. Polybasic acids, e.g. phthalic, adipic, sebacic, or adducts of abietic acid with maleic acid may be employed. Hydroxy fatty acids such as ricinoleic may also be used. Commercial mixtures of acids or resins containing carboxyl groups may be used, e.g. dammar resins, shellac, alkyd resins, or acid resins of the maleic acid type. Small amounts of mineral acids may be added. The products are generally soluble in benzene, toluene, solvent naphtha, petroleum ether, turpentine, butyl acetate, butanol or benzine. They are usually hardenable by heat or accelerators. Esters with unsaturated acids, e.g. linoleic dry in air. In example (1) hexamethylolmelamine hexamethyl ether is heated with a variety of acids and the properties of the products are tabulated. In example (2) hexamethylolmelamine butyl ether is heated with linoleic acid in presence of small quantities of hypophosphorous acid and triethanolamine. In example (3) the methyl ether of a hydrophobic melamine-formaldehyde resin is heated with linoleic acid. Example (4) describes a moulding powder prepared by mixing wood meal with a solution in tetrahydronaphthalene of an ester from sebacic acid and hexamethylol melamine hexamethyl ether, followed by drying and grinding. In example (5) a methylolformaguanamine methyl ether is heated with stearic acid. In example (6) the methyl ether of a melamine-formaldehyde condensation product prepared from 9 mols of formaldehyde to 1 of melamine is heated with linoleic acid. Specifications 486,519, 486,577, 562,089 and U.S.A. Specification 2,229,265 also are referred to.