Patent GB-362481-A (GB)
Title: Improvements in or relating to the protection of rubber and other insulating materials
IPC: H01B7/28
Filed: 1930-08-28
Abstract: Electric insulating materials, particularly those containing rubber, are protected from the action of ozone &c. by coating with a composition containing an organic cellulose derivative and as a plasticizer more than an equal weight of an aromatic sulphonamide or its derivative or a tartrate ester.  Cellulose derivatives specified are the acetate, formate, propionate, butyrate, or higher members of this series, or the nitro-acetate, or ethers such as methyl, ethyl, or benzyl cellulose.  Suitable plasticizers are the N-alkyl substituted sulphonamides such as xylene monomethyl sulphonamide, and dibutyl and amyl tartrates.  Natural, synthetic or semi-synthetic resins may be added; suitable synthetic resins are the phenol-aldehyde or ketone resins, furfural-ketone and furfural-amine resins, resins obtained by condensing aldehydes or ketones with aromatic sulphonamide compounds, or by condensing ureas or thioureas with aldehydes, lactic acid resins, sulphurized phenol resins, and polymerized aldehyde or vinyl resins.  In addition to the plasticizers of the invention, others such as triphenyl phosphate, tricresyl phosphate, diphenylol propane, triacetin, and diethyl phthalate may be used.  Pigments, dyes and high or low boiling solvents may be added.  The composition may be applied in a liquid or plastic state, and may be sprayed, painted or moulded on to the articles to be protected.  Alternatively it may be applied to tapes, ribbons and the like of silk, cotton, or regenerated cellulose which are subsequently wound round the insulating material, e.g. the covering of a cable.  Bias tape may be used, or a warp of threads may be united by the composition.  During or after application, heat or solvents in liquid or vapour form may be applied.  Specifications 132,283, 164,384, 164,385, 164,386, [all in Class 95, Paints &c.], and 358,428 are referred to.ALSO:Electric insulating materials, particularly those containing rubber, are protected from the action of ozone &c. by coating with a composition containing an organic cellulose derivative and as a plasticizer more than an equal weight of an aromatic sulphonamide or its derivative or a tartrate ester. Cellulose derivatives specified are the acetate, formate, propionate, butyrate, or higher members of this series, or the nitro-acetate or ethers such as methyl, ethyl, or benzyl cellulose.  Suitable plasticizers are the N-alkyl substituted sulphonamides such as xylene monomethyl sulphonamide and dibutyl and amyl tartrates.  Natural synthetic or semisynthetic resins may be added; suitable synthetic resins are the phenol-aldehyde or ketone resins, furfural-ketone and furfural-amine resins, resins obtained by condensing aldehydes or ketones with aromatic sulphonamide compounds, or by condensing ureas or thioureas with aldehydes, lactic acid resins, sulphurized phenol resins, and polymerized aldehyde or vinyl resins.  In addition to the plasticizers of the invention, others such as triphenyl phosphate, tricresyl phosphate, diphenylol propane, triacetin, and diethyl phthalate may be used.  Pigments, dyes and high- and low-boiling solvents may be added.  The composition may be applied in a plastic state, and moulded on to the articles to be protected.  Alternatively it may be applied to tapes, ribbons, and the like of silk, cotton, or regenerated cellulose which are subsequently wound round the insulating material, e.g. the covering of a cable.  During or after application, heat or solvents in liquid or vapour form may be applied.  Specifications 132,283, 164,384, 164,385, 164,386, [all in Class 70, Indiarubber &c.], and 358,428 are referred to.