Organic compounds -- part of the class 532-570 series – Organic compounds – Carbohydrates or derivatives
Patent
1998-03-23
2000-10-10
Peselev, Elli
Organic compounds -- part of the class 532-570 series
Organic compounds
Carbohydrates or derivatives
536124, C08B 1600
Patent
active
061303275
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
Regenerated celluloses, which contain selected phosphor compounds as a flame-retardant agent, constitute the subject matter of the invention.
SUMMARY OF THE INVENTION
The invention relates in particular to flame-retardant regenerated celluloses which contain at least one compound of formula I ##STR2## in which R.sub.1, R.sub.2 mean independently of each other an unsubstituted or substituted C.sub.1-12 alkyl-, C.sub.5-7 cycloalkyl-, C.sub.7-12 aralkyl- or C.sub.6-12 aryl-residue and
In formula I, R.sub.1 and R.sub.2 mean preferably an iso-butyl residue and X is preferably oxygen.
The compounds of formula I are well-known and can be manufactured in a manner known to the expert e.g. in accordance with the method described in U.S. Pat. No. 4,855,507.
The use of the above said components as flame-retardant agents in fully synthetic polymers, particularly polyolefines, impact-resistant modified polystyrenes, polyamide, polyphenylenoxide, polyphenylenoxides modified with impact-resistant modified polystyrenes, polyethylenetherephthalate and polyurethanes is likewise known. Surprisingly it was discovered that the compounds of formula I are also suitable for the flame-retardant finishing of regenerated cellulose. The subject matter of the invention is therefore also the use of compounds of formula I as a flame-retardant agent for regenerated cellulose and a process for the flame-retardant finishing of regenerated cellulose via the addition of compounds of formula I or dispersions containing these compounds.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
"Regenerated cellulose or cellulose hydrate" is a well-known expression. Regenerated cellulose is generally manufactured by bringing the cellulose into solution form using established processes. This is performed by dissolving the cellulose in suitable organic solvents such as amine oxides, particularly N-methyl morpholine oxide ("Lyocell process") or by converting the cellulose into soluble cellulose derivatives such as xanthogenate ("viscose process") or soluble tetramine-copper-(II)-hydroxide complexes ("Glanzstoff process"). The compound(s) of formula I are added as such to the cellulose solution or dispersed in a suitable medium. The addition is performed using well-known processes either continuously or discontinuously e.g. in batches, followed by rigorous mixing in order to distribute the compound(s) in formula I respectively a dispersion evenly in the cellulose solution. The regenerated cellulose is precipitated from the previously named solutions which contains the compound(s) of formula I using an established process e.g. by pressing this solution through fine nozzles or slits to manufacture filaments or films. The important technical properties of the regenerated cellulose are only slightly influenced by the addition of a flame-retardant agent of formula I according to the invention.
It is especially preferred that the flame retardant regenerated cellulose in accordance with the invention is precipitated from solutions of the cellulose in amine oxides, preferably N-Methylmorpholine oxide.
It is generally known, that cellulose can be very well dissolved in aqueous tertiary amine oxides, especially N-Methylmorpholineoxide (NMMO). The manufacture of cellulosic products from such solutions of cellulose in amine oxides is carried out in known manner by extruding the solution through a shaping tool and conducting the solution into an aqueous precipitation bath whilst stretching it, whereby the cellulose is precipitated from the solution.
It has been shown, that the compounds of formula (I) and especially the compound of formula (I), in which R.sub.1 and R.sub.2 mean iso-butyl and X means oxygen, are very stable against the conditions of this process in comparison with commercial products known in the state of the art. Thereby a flame retardant cellulosic product can be obtained in an economic manner.
The flame retardant cellulose can be present in the form of e.g. a fibre or a film depending on the shaping procedure.
Regene
REFERENCES:
patent: 4083833 (1978-04-01), Siclari et al.
patent: 4855507 (1989-08-01), Robertson et al.
Ruf Hartmut
Wolf Rainer
Lenzing Aktiengeselleschaft
Peselev Elli
LandOfFree
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