GB527414A - Improvements in or relating to the production of amide condensation resins - Google Patents

Abstract

527,414. Urea-aldehyde resins. ALBERT PRODUCTS, Ltd. April 11, 1939, No. 11014. Convention date, April 13, 1938. [Class 2 (iii)] Resinous condensates of urea or its derivatives and aldehydes are heated for several hours about 70‹C. under substantially neutral waterfree conditions with mono-alcohols boiling above 80‹C., simultaneously distilling off unreacted alcohol and water of reaction. The condensates may be prepared from urea, thiourea or other urea derivatives, e.g. urethanes, guanidines, alkyl ureas, dicyandiamide, and aldehydes, e.g. formaldehyde, acetaldehyde, or butyraldehyde, or from methylol compounds, e.g. dimethylolurea, with or without aldehyde condensates of other amino-bodies, sulphonamides, mono- and polycarboxylic acid amides, aniline and triazines (e.g. melamine). Alcohols specified are propyl, butyl, amyl, hexyl, octyl, benzyl alcohols ; cyclohexanol ; terpene alcohols, or mixtures thereof. The process may be carried out in the presence of phenolalcohols : one or more fatty oils (e.g. castor oil), acid or neutral resins, polycarboxylic acid-polyhydric alcohol esters, modified alkyd resins ; polymerization resins such as polyvinyl resins, e.g. polystyrol, polyacrylic resins, couma@one resins, and mixed polymerizates, terpene-phenol resins, terpene-maleic resins, phenol- and amine-aldehyde resins ; cellulose derivatives, butadiene derivatives, caoutchouc conversion products, or softening agents, may be added to the urea &c. condensates before, during, or after the heating with mono-alcohols. The products may be used in coating, impregnating compositions, textile assistants or sizes, moulding compositions, and threads, foils, or bands. In examples : (1) urea and formaldehyde are condensed and the condensate dissolved in amyl alcohol, the solution being then boiled for 6-8 hours ; (2) dimethylol urea and dimethylolthiourea are resinified in butanol solution, a solution of cresol dialcohol in cyclohexanol added and the mixed solutions heated for 8-10 hours at 100-140‹C. According to the Specification as open to inspection under Sect. 91, reaction products of urea and/or urea derivatives and aldehydes, free or largely free from water, are heated for several hours with the alcohols and to the temperature stated above. Reference is also made to the addition, before, during, or after the heating With alcohol, of fatty oil acids and of natural or artificial resins broadly. This subject-matter does not appear in the Specification as accepted.