GB542932A - Improved resinous condensation products and methods of producing same - Google Patents

Abstract

542,932. Urea-aldehyde condensation products. BRITISH THOMSON-HOUSTON CO., Ltd. July 31, 1940, No. 12380. Convention date, Aug. 9, 1939.. [Class 2 (iii)] Self-curing resinous condensation products are produced by the condensation of a urea, an aliphatic aldehyde and an aldehyde reactable halogenated acylated urea in which at least one halogen atom is attached to an alpha or a beta carbon atom. Numerous examples of such acylated ureas are given. Specified urea compounds are urea, thiourea, acetyl-, benzoyl-, phenyl-, assymetrical diethyl-, allyl-, 2-chloro-allyl-, ethylidene-, methylol-, and methylene ureas ; guanidine, dicyandiamide, guanyl urea, guanylthiourea, biguanidine, aminoguanidine, aminotriazole, creatine, creatinine, guanoline, ethylene pseudo-sulphocarbamide derivatives, sulphohydantoin and triazine derivatives. Aldehydes specified comprise paraformaldehyde, hexamethylenetetramine, acetaldehyde, propionaldehyde, butyraldehyde, acrolein, methacrolein, crotonaldehydes or mixtures thereof. The condensation may be carried out under neutral, alkaline or acid conditions, e.g. in presence of 'alkalies, acids or amines. The mixed reactants may be condensed together. Alternatively the acylated urea may be added to a partial urea-aldehyde condensation product or the acylated urea and aldehyde may be condensed and the urea re-acted with the condensation product. In examples (1) 60 parts urea, 7.6 parts ammonia (28 per cent.), 161 parts aqueous formaldehyde and 0.04 parts sodium hydroxide are mixed and re-fluxed together for 20-30 mins.,. and one part of mono chlor acetyl urea added to the mixture. 61 parts of alpha flock and 0.4 parts zinc stearate are then added and the mixture heated to 50‹ C. and dried to form a moulding composition. (4) Similar proportions are used with chloroacetyl-ethyl-hydantoate. Up to “ mol. of the halogenated urea may be used per mol. urea. Modifying agents may be added, e.g. monohydric or polyhydric alcohols ; monoamides, e.g. formamide, acetamide, stearamide, acylic acid amides, benzamide, toluene sulphonamide or polyamides, e.g. adipic diamide, or phthalamide, or amines, e.g. ethylene diamine, aniline, phenylenediamine or aminophenols ; condensation products of aldehydes with proteins, furfural, aniline, phenol, sulphonamide ; polyhydric alcohol. polybasic acid condensation products cellulose derivatives ; natural gums and resins polyvinyl compounds ; synthetic linear condensation products known as " nylon " ; dyes, pigments, opacifiers, mould lubricants and fibrous fillers. The products may be used for making buttons, clock cases, radio cabinets, arc extinguishing tubes, liquid compositions may be employed as varnishes, lacquers, anti-creasing agents &c. Many of the acylated ureas specified in the Specification as open to inspection under Sect. 91 do not appear in the Specification as accepted.