GB542934A - Improved resinous condensation products and methods of producing same - Google Patents

Abstract

542,934. Urea-aldehyde condensation products. BRITISH THOMSON-HOUSTON CO., Ltd. July 31. 1940, No. 12385. Convention date, Aug. 9, 1939. [Class 2 (iii)] A self-curing resin is produced by the condensation of a urea, an aliphatic aldehyde, and a halogenated amide selected from the class consisting of alpha halogenated amides, beta halogenated amides and alpha, beta halogenated amides, the amide grouping being where R is hydrogen, or an alkyl, aryl, aralkyl, alkaryl, acyl, naphthyl, hydrocyclic or heterocyclic radical or a nitro, halogeno, aceto, carbalkoxy, or acetoxy derivative of the said radical. Specified halogenated compounds include mono, and di chloro or bromo acetamide, propionamide, butyramide, succinamide, adipamide and many others. Specified ureas are urea, thiourea, acetyl-, benzoyl-, ethylidene-, methylol-, and methyleneureas ; guanidine, dicyandiamide, aminotriazole, creatine, creatinine, guanoline, ethylene pseudo-sulphocarbamide derivatives, sulphohydantoin, and triazine derivatives. Specified aldehydes are paraformaldehyde, hexamethylenetetramine, acetaldehyde, propionaldehyde, butyraldehyde, acrolein, methacrolein, crotonaldehyde or mixtures thereof. The condensation is carried out under neutral or alkaline conditions but a small quantity of acid may be added initially to start the re-action. The mixed reactants may be condensed together or partial condensation products may be formed of two components and the third then added. Preferred molecular proportions are 1¢-2¢ mols. aliphatic aldehyde per mol. urea and up to “ mol. halogenated amide. Modifiers may be added, e.g. mono and polyhydric alcohols, amides and amines; hydrolysed wood products; aldehyde condensation products of phenol, proteins, anilines, sulphonamides ; polyvinyl compounds, natural gums or resins, water-soluble cellulose derivatives ; synthetic polyamides known as "Nylon." Dyes, pigments, opacifiers, mould lubricants and fillers may also be added. The products may be employed as liquid coating compositions, anticreasing agents or moulding compositions for moulding buttons, clock cases, radio cabinets, arc extinguishing tubes &c. In examples (1) 60 parts urea, 7.6 parts ammonia, 161 parts aqueous formaldehyde, 0.04 parts sodium hydroxides and 1 part chloracetamide are refluxed together for 5 mins. and the resulting syrup mixed with 61 parts alpha cellulose flock and 0.5 parts zinc stearate is dried at 50‹ C. The Specification as open to inspection under Sect. 91 referred to the following halogenated amides-α-bromo malonic diamide, N - (# - nitrophenyl) - # - dichloropropionamide, α - iodosuccinimide, α - fluoro - adipamide - N - aceto, α - chloro, # phenyl propionamide ; α, #-dibromopyrotartaric diamide ; N-cyclohexyl, α-chloromalonic diamide ; α 1 , α<SP>1</SP>-dibromo, N-furfuryl monamide methyl succinate, N-pyrryl, α, α<SP>1</SP>, di-chloro butyl-pyroracemate monoamide, α-chlorohydantoin. This subjectmatter does not appear in the Specification as accepted.