Patent GB-542973-A (GB)
Title: Improved resinous condensation products and methods of producing same
IPC: C08G12/12
Filed: 1940-07-31
Abstract: 542,973. Self-curing synthetic resins. BRITISH THOMSON-HOUSTON CO., Ltd. July 31, 1940, No. 12384. Convention date, Aug. 9, 1939. [Class 2 (iii)] A self-curing urea-aldehyde resin is prepared by heating together, preferably under refluxing conditions, an aqueous mixture of a urea substance and an aliphatic aldehyde with the addition, at the initial or an intermediate stage of the resin-forming process, of an aldehyde-reactable nitrated urea substance. Specified urea substances are :-Urea, thiourea., methyl urea, acetyl urea, benzoyl urea, phenyl thiourea, asymmetrical diethyl urea, allyl urea, 2-chloro-allyl urea, ethylidene urea, methylol urea, methylene urea, guanidine, dicyandiamide, guanyl urea, guanyl thiourea, biguanidine, aminoguanidine, aminotriazole, creatine, creatinine, guanoline, ethylene pseudosulphocarbamide derivatives, sulphohydantoin, and triazine derivatives. Specified aldehyde-reactable nitrated urea substances are :-Nitrourea, N- nitro N<SP>1</SP>-methyl urea, N-octadecyl N<SP>1</SP> nitrourea, N-nitro N-methyl urea, nitroguanidine, nitrobiuret, nitrothiourea, nitrodicyandiamide, nitroguanoline and nitroguanylurea, and these may be used as such, or as their salts with basic substances such as ammonia, potassium hydroxide, sodium hydroxide, calcium hydroxide, methyl amine, trimethylamine, ethanolamine, ethylene diamine and triethanolamine. Specified aliphatic aldehydes are formaldehyde, paraformaldehyde, hexamethylenetetramine, acetaldehyde, propionaldehyde, butyraldehyde, acrolein, methacrolein and crotonaldehyde. The proportion of the nitrated urea preferably does not exceed “ mol. per mol. of the urea. The re-action is preferably started under neutral or alkaline conditions, and condensation catalysts may be present. Examples are given. The resultant self-curing resins may be mixed with fillers, pigments, dyes, lubricants or plasticizers, for use as moulding compositions, paints, varnishes, lacquers, enamels, adhesives, fire-retardants and water-repellents. Specified additions are :- barium sulphate, zinc sulphide, titanium oxides, flaked aluminium or copper, stearates and palmitates of tin or zinc, carnauba or paraffin wax, wood flour, alpha cellulose flock, fibrous materials, mica, wood chips, glass fibres, dimethyl phthalate, diethyl phthalate, dibutyl phthalate, tricresyl phosphate and triphenyl phosphate. Specified modifying agents, which may be introduced before, during or after condensation between the primary components, are ethyl, propyl, isopropyl, butyl and amyl alcohols, ethylene glycol, di-ethylene glycol, glycerine, pentaerythritol, trimethylol nitromethane, formamide, acetamide, stearamide, acrylic acid amides, benzamide, toluene, sulphonamide, adipic diamide, phthalimide, ethylene diamine, aniline, phenylene diamine, amino phenols, lignin, proteins, protein-aldehyde condensation products, furfural condensation products, phenol-aldehyde condensation products, anilina-aldehyde condensation products, alkyd resins, sulphonamide-aldehyde resins, watersoluble cellulose derivatives, copal, shellac, rosin, polyvinyl alcohol, polyvinyl acetate and polyvinyl acetals. In the Specification as open to inspection under Sect. 91, the following substances also are specified as suitable aldehyde-reactable nitrated urea substances :-N-nitro N-methyl N<SP>1</SP>-ethyl urea ; N-nitro N'-phenyl urea ; nitro biguanidine ; nitro guanyl thiourea ; nitro sulphohydantoin ; nitro ethylene pseudo-thiourea ; and nitro amino triazole. This subjectmatter does not appear in the Specification as accepted.