Patent GB-367840-A (GB)
Title: Improvements in or relating to the manufacture of vulcanisation accelerators and the vulcanisation of rubber
IPC: C08K5/00
Filed: 1930-11-25
Abstract: Vulcanization accelerators are manufactured by condensing a chlorinated aldehyde-amine condensation product (particularly a chlorinated condensation product of an aliphatic aldehyde containing less than eight carbon atoms in the molecule with an aromatic amine) with mercaptobenzothiazole, a homologue thereof, or a salt of either. In examples: (1) a condensation product of one molar proportion each of butyraldehyde and aniline is condensed with a further two molar proportions of butyraldehyde, if desired in the presence of a condensing agent such as an organic acid, the product is treated with chlorine and the chlorinated compound is condensed with the sodium salt of mercaptobenzothiazole in an alcoholic medium; (2) a reaction product of three molar proportions of acetaldehyde with two of aniline is chlorinated in carbon tetrachloride solution and the product condensed with an alkali-metal (preferably sodium) salt of mercaptobenzothiazole, preferably in alcoholic solution; (3) a condensation product of two molar proportions of heptaldehyde with one of aniline is chlorinated and the product condensed with an alkali metal (e.g. sodium) salt of mercaptobenzothiazole, preferably in alcoholic solution.  Other aldehydeamine condensation products specified are: anhydroformaldehyde-aniline, methylidene dianilide, acrolein-aniline, heptaldehyde dianilide (prepared by the reaction of one molar proportion of heptaldehyde with two of aniline in a vessel cooled in ice), butyraldehyde-aniline, and butyraldehyde dianilide (obtained similarly to heptaldehyde dianilide from butyraldehyde). Specification 251,005, [Class 2 (iii), Dyes &c.], is referred to. The Specification as open to inspection under Sect. 91 (3) (a) comprises also the use of mercaptoarylthiazoles in general and of salts thereof.  This subject-matter does not appear in the Specification as accepted.ALSO:Vulcanization accelerators comprise the products of condensation of a chlorinated aldehydeamine condensation product (particularly a chlorinated condensation product of an aliphatic aldehyde containing less than eight carbon atoms in the molecule with an aromatic amine) with mercaptobenzothiazole, a homologue p  thereof or a salt of either.  Examples describe the products of condensation of: (1) a chlorinated derivative of a product obtained by condensing a condensation product of one molar proportion each of butyraldehyde and aniline with a further two molar proportions of butyraldehyde, with the sodium salt of mercaptobenzothiazole; (2) a chlorinated derivative of a condensation product of three molar proportions of acetaldehyde with one of aniline, with an alkali metal (preferably sodium) salt of mercaptobenzothiazole; (3) a chlorinated derivative of a condensation product of two molar proportions of heptaldehyde with one of aniline, with an alkali metal (e.g. sodium) salt of mercaptobenzothiazole. Other aldehyde-amine condensation products specified are: anhydroformaldehyde-aniline, methylidene dianilide, acrolein-aniline, heptaldehyde dianilide, butyraldehyde-aniline and butyraldehyde dianilide.  Specification 251,005, [Class 70, Indiarubber &c.], is referred to.  The Specification as open to inspection under Sect. 91 (3) (a) comprises also the use of mercaptoarylthiazoles in general and of salts thereof.  This subject-matter does not appear in the Specification as accepted.