Flame-resistant cellulosic textiles and process of reacting cellulose ether textiles with aziridinyl phosphine oxide or sulfide

摘要

Flame-resistant textiles comprise chemically modified cellulose having the general formula: FORM:0901463/IV(a)/1 in which X represents an unmodified or modified cellulose molecule residue, n represents 0 to 3, Z represents P-O-R or S=O, R represents hydrogen, an unsubstituted or substituted alkyl or aryl group or a salt-forming cation, Y represents a 1-aziridinyl, a dialkylamino, an alkyl, an alkenyl or an aryl group and Q represents oxygen or sulphur; or structural units derived therefrom in which the free 1-aziridinyl groups in the modified cellulose have been reacted with other inorganic acid groups or with further 1-aziridinyl compound. The textiles may be produced by treating a textile material comprising cellulose previously modified to correspond to the formula: FORM:0901463/IV(a)/2 in which X, n, and Z have the significance stated above, and M represents hydrogen or a salt-forming cation, with a solution of at least one 1-aziridinyl compound containing two or more 1-aziridinyl groups attached directly to a phosphorus atom. The preferred 1-aziridinyl phosphorus compounds correspond to the general formula: FORM:0901463/IV(a)/3 in which Q represents oxygen or sulphur and Y represents a 1-aziridinyl, a dialkylamino, an alkyl, an alkenyl or an aryl group. The previously modified cellulose may be phosphonomethyl cellulose, sulphoethyl cellulose, cellulose phosphate or cellulose sulphate. When M or R represent a salt-forming cation, this is preferably replaced to liberate the free acid, e.g. by treating the salt with a dilute aqueous solution of a mineral acid. In an example, phosphonomethylated cotton sheeting containing 0,44% phosphorus is converted into the free acid form by soaking it in a 3% aqueous hydrochloric acid, washed with water, air dried, padded through a 10% aqueous solution of tris(1-aziridinyl) phosphine oxide and cured for five minutes at 130 DEG C. The cellulosic materials of the invention are insoluble in water and possess a flame resistance which is durable to bleaching and laundering. Specification 893,283 is referred to.