Patent GB-542974-A (GB)
Title: Improved resinous condensation products and methods of producing same
IPC: C08G12/04
Filed: 1940-07-31
Abstract: 542,974. Urea-aldehyde condensates. BRITISH THOMSON-HOUSTON CO., Ltd. July 31, 1940, No. 12387. Convention date, Aug. 9, 1939. [Class 2 (iii)] A self-curing urea-aldehyde resin is prepared by heating together, preferably under reflux 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 aldehydereactable inorganic salt of an aminoamide or an aminonitrile. The salts used are those of aminoamides in which at least one hydrogen is attached to the amido nitrogen, and there are less than 4 carbon atoms, and salts of the corresponding aminonitriles may be used. These salts are added in an amount not exceeding “ mol. per mol. of urea substance. Specified urea substances are :- urea, thiourea, methylurea, acetyl urea, benzoyl urea, phenyl thiourea, asymmetrical diethyl urea, allyl urea, 2-chloroallyl urea, ethylidene urea, methylol urea, methylene urea, guanidine, dicyandiamide, guanylurea, guanylthiourea, biguanidine, aminoguanidine, aminotriazole, creatine, creatinine, guanoline, ethylene pseudo-sulphocarbamide derivatives, sulphohydantoin, and triazine derivatives. Specified aliphatic aldehydes are :-formaldehyde, para-formaldehyde, hexamethylene-tetramine, acetaldehyde, propionaldehyde, butyraldehyde, acrolein, methacrolein and crotonaldehyde. Specified aldehydereactable salts are :-the hydrochloric, hydrobromic, hydroiodic, hydrofluoric, nitric, sulphuric, phosphoric, boric, selenic and chromic acid salts of aminoacetamide, aminoacetonitrile, α-aminopropionitrile and #-aminopropionitrile. The reaction 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, fireretardants and water-repellents. Specified additions are :-barium sulphate, zinc sulphide, titanium oxides, flaked aluminium or copper, stearates or palmitates of tin or zinc, carnauba or paraffin wax, wood fibre, alpha cellulose flock, fibrous materials, mica, wood chips, glass fibres, dimethyl phthalate, diethyl phthalate, dibutyl phthalate, tricresyl phosphate and triphenyl phosphate. Specified nodifying 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, pentaecrythritol, trimethylol nitromethane, formamide, acetamide, stearamide, acrylic acid amides, benzamide, toluene sulphonamide, adipic diamide, phthalimide, ethylene diamine, aniline, phenylene diamine, amino phenols, lignin, proteins, proteinaldehyde condensation products, furfural condensation products, phenol-aldehyde condensation products, aniline-aldehyde condensation products, alkyd resins, sulphonamide-aldehyde resins, water-soluble cellulose derivatives, copal, shellac, rosin, polyvinyl alcohol, polyvinyl acetate and polyvinyl acetals. Specification 467,166 is referred to. In the Specification as open to inspection under Sect. 91 the aldehyde-reactable salts are not limited to salts of inorganic acids, or to those in which there are less than 4 carbon atoms, and many other salts of aminoamides and of aminonitriles are specified. This subjectmatter does not appear in the Specification as accepted.