GB259933A - Improvements in or relating to vulcanization accelerators and method of making the same - Google Patents

Abstract

259,933. Naugatuck Chemical Co., (Assignees of Cadwell, S. M., and Maximoff, A. T.). Oct. 15, 1925, [Convention date]. Condensation products of aldehydes and nitrogen compounds.-Products having the property of accelerating the vulcanization of indiarubber are obtained by condensing an aldehyde and a basic nitrogenous material at a temperature which initially and throughout the reaction is above 100‹ C; the preferred temperature is 135-145‹ C. The reaction may be begun by heating one of the components to the reaction temperature and then adding the other, and may be carried out under increased pressure. An addition of acid may be made when the nitrogenous material is strongly basic. The products may be improved by prolonged heating or by steam distillation for the removal of impurities. According to an example, heptaldehyde (2 mols.) is heated to 140‹ C. in a closed vessel and aniline (1 mol.) is slowly added. The pressure developed in the vessel is maintained for 30 minutes after the addition of the aniline, whereafter the water formed in the reaction is allowed to escape. The product may be heated at 135-145‹ C. for about 20 hours or the impurities may be removed by steam distillation. Heptaldehyde and aniline in equimolecular proportions may be similarly condensed. Another example describes the condensation of heptaldehyde and ammonia, and reference is made also to the manufacture of products from acetaldehyde and aniline, butyraldehyde and aniline, aldol and aniline, nonaldehyde and aniline, and heptaldehyde and ethylamine, p-toluidine, benzidine, pphenylenediamine, p-aminodimethylaniline, and urea. Specification 180,978 is referred to.