GB520162A - Improvements in or relating to the working up of cellulose derivatives - Google Patents

Abstract

520,162. Cellulose derivative compositions. DEUTSCHE HYDRIERWERKE AKT.-GESOct. 13, 1938, Nos. 29713 and 29714. Conven. tion dates, Oct. 13, 1937, and Oct. 7, 1938. [Class 2 (ii)] An aliphatic or cycloaliphatic sulphonamide containing at least 3 carbon atoms in the molecule and having at the nitrogen atom at least one substituted or unsubstituted hydrocarbon residue, the chain of which is not interrupted by an oxygen atom, is employed as solvent, softening, gelatinizing or swelling agent in the working up of cellulose derivatives to manufactured or partly manufactured products. The sulphonamide may be substituted at the nitrogen atom by one or more aliphatic, cycloaliphatic, or aliphatic-cycloaliphatic residues. Atoms other than carbon or hydrogen or groups containing such atoms may be present in the hydrocarbon residues. Halogen, oxygen, or sulphur atoms, or groups containing oxygen, sulphur, or nitrogen may be present. The hydrocarbon residue may be a methyl, butyl, octyl, dodecyl, octadecyl, oleyl, cyclohexyl, methylcyclohexyl, decahydronaphthyl, alkyl substituted cycloalkyl, naphthenyl, or abietyl group. Butyl-sulpho-N-octadecylamide, octylsulpho-N-cyclohexylamide, methyl sulpho-N- methyl-N-octadecylamide, methyl sulpho-N- dodecyloxyethylamide, ethoxyethane-sulpho-N- diethylamide, and ethyl-sulpho-N-oleylamide, may be used. The sulphonamides may be used alone or in admixture with one another or with other solvent or softening agents for the production of lacquers, films, and other shaped structures, plastic masses and the like from cellulose ethers such as ethyl or benzyl cellulose, or cellulose esters such as the acetate, formate, or nitrate. In an example, a cellulose nitrate lacquer is obtained by dissolving cellulose nitrate in butyl acetate, butyl alcohol, and xylene mixture, and then adding to the solution butyl-sulpho-N-octadecylamide and cyclohexyl-sulpho-N-dibutylamide. The Specification as open to inspection under Sect. 91 refers also to the use of sulphonamides which are unsubstituted at the nitrogen atom. In an example, cellulose acetate is dissolved in acetone, methyl alcohol, methyl acetate, ethyl acetate, benzene, and methylene chloride and n-butyl sulphonamide is added as plasticiser. The solution is used as a lacquer for cables. In another example, cellulose acetate is dissolved in tetrahydrofurfuryl alcohol, ethyl alcohol, and acetone, and a mixture of n-butyl-, and ndodecyl sulphonamide is added, the solution being used as a painting lacquer. In another example, a cellulose nitrate lacquer containing methylcyclohexyl sulphonamide is obtained. This subject-matter does not appear in the Specification as accepted