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US 8,177,859 B2Granted
Method of flameproofing cellulose fibers
AssigneeEvonik Degussa GmbH
InventorsManfred Schmidt, Stephanie Schauhoff, Frank Gähr
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Abstract
The present invention is directed to methods for flameproofing cellulose fibres and articles containing these fibres. The method involves treatment of materials with cyanuric chloride.
Claims9
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:
- R1 is selected from the group consisting of:
- Cl;
- OX;
- SO3X;
- SO2X;
- OSO3X;
- OSO2X;
- OPO3X;
- OPO2X;
- NH2—(CH2)n—COOH (n=1-3);
- NH—(CH2)n—OH (n=1-3);
- N(—(CH2)n—OH)2, (n=1-3);
- and wherein X is selected from the group consisting of:
- H+;
- Li+;
- Na+;
- K+;
- ½Mg++;
- and ½Ca++;
- and
- R2 is selected from the group consisting of:
- OX;
- SO3X;
- SO2X;
- OSO3X;
- OSO2X;
- OPO3X;
- OPO2X;
- NH2—(CH2)n—COOH (n=1-3);
- NH—(CH2)n—OH (n=1-3);
- N(—(CH2)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.
40 more elements
Dependencies are inferred from the claim text.