Patent ID: 6555678
Filing Date: 2003-04-29
Classification: D01F

Abstract:
Process for the manufacture of a regenerated cellulose yarn comprising spinning a solution of a cellulose derivative or cellulose derivative in the molten state through at least one die hole and regenerating the cellulose by treatment of the yarn obtained, comprisingsynthesizing a silylated derivative of the cellulose by reaction with a silylating agent, extracting the said silylated derivative of the cellulose from the synthesis reaction mixture, spinning said silylated cellulose derivative, dissolved or brought to the molten state, through at least one die hole, treating said yarn with a desilylating agent, in order to regenerate the cellulose and recover a siloxane and optionally regenerating the silylating agent from the siloxane recovered in the stage of regeneration of the cellulose, wherein the silylating agent corresponds to one of the following general formulae: â€ƒin which: n is between 0 and 20 inclusive R1 which can be identical or different, represent linear or branched alkyl radicals comprising from 1 to 12 carbon atoms or aromatic radicals R2 which can be identical or different, represent linear or branched alkyl radicals comprising from 1 to 12 carbon atoms or aromatic radicals R represents an alkyl, aralkyl, aryl or alkylaryl radical or radicals of following general formulae: â€ƒin which: R3, R4, R5, R7 and R8, which can be identical or different, represent the hydrogen atom or an alkyl group comprising from 1 to 4 carbon atoms, R6 represents an alkoxy group or an alkyl group comprising from 1 to 4 carbon atoms, X represents a radical of following formula (V): â€ƒin which: U represents a hydrocarbonaceous radical, an NH radical or an oxygen or sulphur atom, T represents a hydrocarbonaceous radical or a sulphur or phosphorus atom, V represents an oxygen or sulphur atom or an NH radical, and T is other than U and than V.