Production of a substantially inert flexible textile material
OwnerCharles Romaniecinventor
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Abstract
A partially carbonized inert fibrous flexible textile material is obtained when a scoured textile material which is a blend of a fibrous acrylonitrile polymer and a fibrous regenerated cellulosic material is impregnated with an aqueous solution of salts which salts are either (a) an ammonium halide and a lower copper alkanoate or (b) an ammonium phosphate and an alkali metal bichromate, the impregnated material heated in a stream of an oxygen-containing gas at 150.degree.-250.degree. C. and then further heated in a stream of inert gas so as to produce a surface temperature on the fibres of 275.degree. to 325.degree. C. and thus rendered substantially uniformly inert.
Claims10
A process for the production of a partially carbonised inert fibrous flexible textile material which comprises the steps of (i) impregnating a scoured textile material formed from a blend of a fibrous acrylonitrile polymer and a fibrous regenerated cellulosic material with an aqueous solution of salts selected from the group consisting of (a) ammonium halides and lower copper alkanoates and (b) ammonium phosphates and alkali metal bichromates, (ii) heating the impregnated material in a stream of an oxygen-containing gas to a temperature within the range of 150.degree. to 250.degree. C. for from 80 to 120 minutes and thereafter (iii) heating the thus treated material in a flowing inert gas atmosphere so as to produce a surface temperature on the fibres of 275.degree. to 325.degree. C. for a time sufficient to render the surfaces of the fibres substantially uniformly inert.
A partially carbonised, fibrous, flexible inert textile material which has been produced by a process which comprises the steps of (i) impregnating a scoured textile material formed from a blend of a fibrous acrylonitrile polymer and a fibrous regenerated cellulosic material with an aqueous solution of salts selected from the group consisting of (a) ammonium halides and lower copper alkanoates and (b) ammonium phosphates and alkali metal bichromates, (ii) heating the impregnated material in a stream of an oxygen-containing gas to a temperature within the range of 150.degree. to 250.degree. C. for from 80 to 120 minutes and thereafter (iii) heating the thus treated material in a flowing inert gas atmosphere so as to produce a surface temperature on the fibres of 275.degree. to 325.degree. C. for a time sufficient to render the surfaces of the fibres substantially uniformly inert.
Dependencies are inferred from the claim text.