Patent GB-973355-A (GB)
Title: Improvements in or relating to flame-proofing of textile fibres and fabrics
Inventor: REDFARN CYRIL AUBREY
IPC: D06M13/292
Filed: 1960-11-28
Abstract: Flame-resistant coated fabrics formed from filaments, fibres, yarns and threads of cellulose acetate produced by spinning a solution having uniformly distributed therethrough a flame-proofing agent, have a coating of a non-tacky film-forming synthetic organic polymer or of a composition containing such a polymer, the flammability of which polymer or polymer-containing composition is not substantially greater than the flammability of standard cellulose acetate, whilst the temperature of thermal decomposition of the polymer or polymer-containing composition does not substantially exceed that of the flame-resistant cellulose acetate employed and the decomposition products of the polymer or polymer-containing composition at the temperature of decomposition are soft and may be sticky.  The cellulose acetate may be rendered flame-resistant by the substantially uniform dispersion therethrough of a tris(polybromo-aliphatic or -aromatic) phosphate having a bromine content of at least 50% by weight in an amount of 2,5-10% by weight of the cellulose acetate.  The weight of the coating may be from 0,1 to 5,0% of the weight of the cellulose acetate.  The coating may be applied as a dressing composition, which may be taken up in an amount from 0,1 to 5,0% of the weight of the cellulose acetate.  The polymer may be an organic derivative of cellulose such as cellulose ethers, e.g. ethyl cellulose; polymers of vinyl and vinylidene monomers which form long carbon chains, at least a proportion of which carbon atoms are linked to acyloxy, carboxylic acid, carboxylic acid anhydride, carboxamide, N-substituted carboxamide, carbalkoxy and carbalkoxy alkyl groups, examples of which are given; alkylated aminoplast-forming condensation products such as the alkylated dimethylol-ureas and the alkylated methylol urea-melamine co-condensation products; and halogenated polymeric hydrocarbons such as chlorinated synthetic rubber.  The coating composition may be applied by passing the fabric through a bath containing a solution, suspension or emulsion of the composition in an aqueous or organic solvent, examples of which are given.  Other flame-proofing agents which may be used are tris (chloro ethyl) and tris (dibromopropyl) phosphate, aluminium pyrophosphate and complex organic halogen-containing polyphosphonate esters.  The fabric may be sized prior to coating.  Specification 958,120 is referred to.ALSO:Flame resistance filaments, fibres, yarns and threads formed from a cellulose acetate produced by spinning a solution having uniformly distributed therethrough a flame-proofing agent, have a coating of a non-tacky film-forming synthetic organic polymer or of a composition containing such a polymer, the flammability of which polymer or polymer-containing composition is not substantially greater than the flammability of standard cellulose acetate whilst the temperature of thermal decomposition of the polymer or polymer-containing composition does not substantially exceed that of the flame resistant cellulose acetate employed and the decomposition products of the polymer or polymer-containing composition at the temperature of decomposition are soft and may be sticky.  The cellulose acetate may be rendered flame-resistant by the substantially uniform dispersion therethrough of a tris(polybromo-aliphatic oraromatic) phosphate having a bromine content of at least 50% in weight in an amount of 2.5 to 10% by weight of the cellulose acetate.  The weight of the coating may be from 0.1 to 5.0% of the weight of the cellulose acetate.  The coating may be applied as a dressing composition, which may be taken up in an amount from 0.1 to 5.0% of the weight of the cellulose acetate.  The polymer may be an organic derivative of cellulose such as cellulose ethers e.g. ethyl cellulose; polymers of vinyl and vinylidene monomers which form long carbon chains, at least a proportion of which carbon atoms are linked to acyloxy, carboxylic acid, carboxylic acid anhydride, carboxamide, N-substituted carboxamide, carbalkoxy and carbalkoxy alkyl groups, examples of which are given; alkylated aminoplast-forming condensation products such as the alkylated dimethylol-ureas and the alkylated methylol urea-melamine co-condensation products; and halogenated polymeric hydrocarbons such as chlorinated synthetic rubber.  The coating composition may be applied by passing the filaments, fibres, yarns, or threads through a bath containing a solution, suspension or emulsion of the composition in an aqueous or organic solvent, examples of which are given.  Other flame proofing agents which may be used are tris (chloro ethyl) and tris (dibromopropyl), phosphate, aluminium pyrophosphate and complex organic halogen-containing polyphosphonate esters.  The filaments, fibres, yarns, and thread may be sized prior to coating.  Specification 958,120 is referred to.