GB684967A - Methods for improving the stability of threads and like products of polydiene-sulphur dioxide compounds - Google Patents

Abstract

The stability of threads and like filamentary products of polydiene-sulphur dioxide compounds is improved by incorporating in the product one or more aromatic hydroxy compounds, such as pyrogallol, quinol, catechol and b -naphthol. Mixtures of such compounds may be used, but it is preferred to use one or more of said compounds in conjunction with one or more of the stabilizing agents described in Specification 666,640, i.e. compounds containing the group <FORM:0684967/IV (a)/1> such as hexamine, triethanolamine, urea and thiourea and their N,N- or N,N1-diphenyl derivatives, and the corresponding diphenyl guanidines. The threads may be first washed, e.g. with methanol to remove any sulphuric acid and are then immersed in solutions of the compounds, preferably in methanol, e.g. of 0.5 to 5 per cent total concentrations, and for times such as 16 hours at 20 DEG C. The threads are then removed from the bath and air-dried. Specifications 527,075, 616,276 and 679,274 also are referred to.ALSO:The stability of threads and like filamentary products of polydiene-sulphur dioxide compounds is improved by incorporating in the product one or more aromatic hydroxy compounds, such as pyrogallol, quinol, catechol, and betanaphthol. Mixtures of such compounds may be used, but it is preferred to use one or more of said compounds in conjunction with one or more of the stabilizing agents described in Specification 666,640, i.e. compounds containing the group <FORM:0684967/V/1> such as hexamine, triethanolamine, urea and thiourea and their N,N- or N,N1-diphenyl derivatives, and the corresponding diphenyl guanidines. The threads may be first washed, e.g. with methanol, to remove any sulphuric acid and are then immersed in solutions of the compounds, preferably in methanol, e.g. of 0.5 to 5 per cent total concentrations, and for times such as 16 hours at 20 DEG C. The threads are then removed from the bath and air-dried. Specifications 527,075, 616,276 and 679,274 also are referred to.