Formed shape made of regenerated cellulose and process for its production
AssigneeOstthuringische Materialprufgesellschaft fur Textil und Kunststoffe mbH
InventorsFrank Meister, Christoph Michels, Horst Kramer
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Abstract
A molding, particularly a fiber or foil molding, of cellulose regenerated an amino-oxide process provides that the cellulose contains 0.02 to 30% mass of a polyalkylene imine derivative. In addition to improved stabilization of the molding compound, the molding or fiber exhibits improved properties, such as an anion exchange capacity, fungistatic properties and an improved hydroblast resistance.
Claims24
Formed shape of cellulose regenerated according to the amino oxide process, characterized in that the cellulose contains 0.02% to 30% by mass of a polyalkyleneimine derivative of the formula ##STR7## in which m is an integer in the range from 20 to 20,000;
- R is hydrogen or methyl and R' is hydrogen or a group which is also linked to at least one nitrogen atom of another molecule of the polyalkyleneimine derivative wherein R' is of the formulae ##STR8## in which R" is an alkylene or arylene group with 2 to 13 carbon atoms;
- R"' is polyethylenediol, R"" is hydrogen or alkyl;
- and X is a single bond or methylene;
- a is an integer from 2 to 4 and .OMEGA. is an integer .gtoreq.2.
Process for the preparation of cellulose-based formed shapes, according to the dry/wet extrusion process, by preparing a polymer solution with 5% to 25% by mass of cellulose;
- 85% to 65% by mass of a tertiary amino oxide;
- and 8% to 16% by mass of a non-solvent for cellulose;
- forming this polymer solution by pressing the solution through forming nozzles, stretching the jet of solution so obtained in a non-precipitating medium, between the nozzle exit and the entry into a precipitating bath;
- precipitation of the cellulose-based formed shape, post-treatment and drying, characterized in that one uses a polymer solution with 0.02 to 30% by mass (in terms of cellulose) of polyalkyleneimine of the formula ##STR11## in which R is hydrogen or methyl and m is an integer in the range from 20 to 20,000;
- and one precipitates out a cellulose-based formed shape containing polyalkyleneimine.
Dependencies are inferred from the claim text.