Abstract The flame-resist properties of natural and synthetic polyamide fibres, especially wool and wool blends, are improved by depositing in the fibres an organic chelate or fluoride complex of titanium, preferably to the extent of 0.2 - 2.5% calculated as titanium dioxide. The complexes may be dissolved as such in an aqueous medium and applied by spraying, padding or by exhaustion from a bath. Alternatively the complexes may be formed in situ in the aqueous medium by adding a complexing agent to a watersoluble titanium compound or on the fibre, as by treating with a fluoride solution fibres already treated with a titanium compound, which may itself be a chelate complex. Where the titanium complex is applied from a bath a dye can be applied to the fibres from the same bath, either simultaneously or as a separate step.
A PROCESS FOR IMPROVING THE FLAME RESISTANCE OF NATURAL AND SYNTHETIC POLYAMIDE FIBERS WHICH COMPRISES WETTING THE FIBERS WITH AN AQUEOUS SOLUTION OF A COMPLE COMPOUND OF TITANIUM CONSISTING ESSENTIALLY OF TITANIUM COMPLEXED WITH FLUORIDE IONS, A DI- OR POLYCARBOXYLIC ACID ORGANIC CHELATING AGENT OR HYDROXYCARBOXYLIC ACID ORGANIC CHELATING AGENT HAVING A PH LESS THAN ABOUT 4 UNTIL THE FIBERS HAVE TAKEN UP AT LEAST 0.2% BY WEIGHT OF THE COMPLEX COMPOUND OF TITANIUM, CALCULATED AS TITANIUM DIOXIDE, FROM SAID SOLUTION.
Claim 2
Dependent Claim
81 words
A PROCESS FOR IMPROVING THE FLAME RESISTANCE OF NATURAL AND SYNTHETIC POLYAMIDE FIBERS WHICH COMPRISES WETTING THE FIBERS WITH AN AQUEOUS SOLUTION OF A COMPLE COMPOUND OF TITANIUM CONSISTING ESSENTIALLY OF TITANIUM COMPLEXED WITH FLUORIDE IONS, A DI- OR POLYCARBOXYLIC ACID ORGANIC CHELATING AGENT OR HYDROXYCARBOXYLIC ACID ORGANIC CHELATING AGENT HAVING A PH LESS THAN ABOUT 4 UNTIL THE FIBERS HAVE TAKEN UP AT LEAST 0.2% BY WEIGHT OF THE COMPLEX COMPOUND OF TITANIUM, CALCULATED AS TITANIUM DIOXIDE, FROM SAID SOLUTION.
Claim 3
Dependent Claim
26 words
The process of claim 1 wherein the amount of complex compound taken up on said fibres is 0.2% to 2.5% by weight, calculated as titanium dioxide.
Claim 4
Dependent Claim
26 words
THE PROCESS OF CLAIM 1 WHEREIN THE COMPLEX TITANIUM COMPOUND CONTAINING FIBERS ARE TREATED WITH AN AQUEOUS SOLUTION CONTAINING FLUORIDE IONS TO REDUCE THE YELLOWING THEREOF.
Claim 5
Dependent Claim
9 words
The process of claim 1 carried out at 20*-130*C.
Claim 6
Dependent Claim
22 words
The process of claim 4 carried out at room temperature where the titanium compound is a complex of titanium and fluoride ions.
Claim 7
Dependent Claim
24 words
The process of claim 4 carried out by immersing the fibres in the solution at the boil until the titanium complex has exhausted thereon.