Method of flameproofing cellulose fibers

1. A method of permanently flameproofing cellulose fibres or an article containing said cellulose fibres, comprising:

a) swelling said cellulose fibres in lye;

b) removing said lye;

c) subsequent to steb b) treating the moist cellulose fibres with a cyanuric chloride derivative in aqueous-alkaline phase, wherein said cyanuric chloride derivative is a compound of the general formula (I)

wherein:

R 1 is selected from the group consisting of: Cl; OX; SO 3 X; SO 2 X; OSO 3 X; OSO 2 X;

OPO 3 X; OPO 2 X; NH 2 —(CH 2 ) n —COOH (n=1-3); NH—(CH 2 ) n —OH (n=1-3); N(—(CH 2 ) n —OH) 2 , (n=1-3); and wherein X is selected from the group consisting of: H + ; Li + ; Na + ; K + ;

½Mg ++ ; and ½Ca ++ ; and

R 2 is selected from the group consisting of: OX; SO 3 X; SO 2 X; OSO 3 X; OSO 2 X; OPO 3 X;

OPO 2 X; NH 2 —(CH 2 ) n —COOH (n=1-3); NH—(CH 2 ) n —OH (n=1-3); N(—(CH 2 ) n —OH) 2 , (n=1-3); and wherein X is selected from the group consisting of: H + ; Li + ; Na + ; K + ; ½Mg ++ ; and ½Ca ++

wherein said cyanuric chloride derivative is used in an amount sufficient to produce a subsequent nitrogen content of at least 2 to 8 wt. %, based on the flameproofed cellulose.

2. The method of claim 1 , wherein:

R l is selected from the group consisting of: Cl; OX; SO 3 X; SO 2 X; OSO 3 X; OSO 2 X;

OPO 3 X; OPO 2 X; wherein X is selected from the group consisting of: H + ; Li + ; Na + ;

K + ; ½Mg ++ ; and ½Ca ++ ; and

R 2 is selected from the group consisiting of: OX; SO 3 X; SO 2 X; OSO 3 X; OSO 2 X;

OPO 3 X; OPO 2 X; and wherein X is selected from the group consisting of: H + ; Li + ;

Na + ; K + ; ½Mg ++ ; ½Ca ++ .

3. The method of claim 1 , wherein said cyanuric chloride derivative is the sodium salt monohydroxydichlorotriazine (NHDT).

4. The method of any one of claim 1 , 2 or 3 , wherein said cellulose fibres are selected from the group consisting of: cotton fibres, regenerated cellulose fibres, cellulose derivative fibres and lyocell fibres.

5. The method of any one of claim 1 , 2 or 3 , wherein said cyanuric chloride derivative is used in an amount from 3 to 200 wt. %, based on cellulose.

6. The method of any one of claim 1 , 2 or 3 , further comprising:

d) after the treatment of step c) drying said fibers; wherein the entire process is carried out at a temperature of at least room temperature and no greater than 150° C.

7. The method of any one of claim 1 , 2 or 3 , further comprising treating said cellulose fibres or said article containing said cellulose fibres with a phosphorus-containing compound before or after flameproofing.

8. The method of claim 7 , wherein said cellulose fibres or said article containing said cellulose fibres are impregnated with said phosphorus-containing compound using a pad, and said phosphorus-containing compound is then fixed.

9. The method of claim 8 , wherein said phosphorus-containing compound is fixed using dry heat.