Patent GB-391828-A (GB)
Title: Improvements in solvent treatments of cellulose derivatives
IPC: D01F2/28
Filed: 1931-11-05
Abstract: Artificial filaments, ribbons, films, and the like are produced from solutions containing cellulose derivatives and alkylated 1, 4-cyclotetramethylene dioxides, for example, the mono-, di-, tri-, tetra-, or higher methylated or ethylated cyclotetramethylene dioxides, or the corresponding compounds containing higher alkyl groups such as propyl, isopropyl, butyl, isobutyl, or isoamyl groups. The solutions employed may contain other low or high boiling solvents and/or diluents, also other constituents such as dyestuffs, pigments, resins, and substances reducing flammability.  In wet spinning processes, the alkylated cyclotetramethylene dioxides may be employed in the coagulating baths as in the processes of Specifications 179,234, [Class 2 (ii), Cellulose &c.], 340,324, and 340,325, or in subsequent treatment baths as is described in Specification 340,437. The alkylated cyclotetramethylene dioxides may also be used in the treatment of formed articles made of or containing cellulose derivatives, for example, to diminish the tendency of fabrics to slip, split, or ladder, and to improve pliability, extension, and knotting properties of filaments, yarns, and the like.  The solvents are also useful for improving the tenacity of filaments by softening the products and simultaneously or subsequently stretching.  The solvents may be employed to assist in the incorporation of solid agents, for example, certain basic and vat dyestuffs, pigments, and discharges.  Again, in the treatment of yarns and fabrics, the solvents may be utilized to effect relustring.  In examples (1) a solution of cellulose acetate in acetone and 2, 5-dimethyl-1, 4-cyclotetramethylene dioxide is extruded into an evaporative atmosphere, (2) an aqueous acetone solution of cellulose acetate is extruded into a solution of 2, 5-dimethyl-1, 4-cyclotetramethylene dioxide in aqueous alcohol, (3) cellulose acetate yarn is soaked in a mixture of 2, 5-diethyl-1, 4-cyclotetramethylene dioxide, alcohol, and water, and stretched, (4) cellulose acetate fabric is printed with a paste containing 2, 5-diethyl-1, 4-cyclotetramethylene dioxide, diethylene glycol, gum arabic, water, and a pigment or dyestuff. According to the Provisional Specification, the alkylated 1,4-cyclotetramethylene dioxides may be employed in the production of cellulose derivative lacquers, plastics, moulding powders, and the like.  Alkylated 1, 4-cyclotetramethylene dioxides are produced by dehydration, e.g. with sulphuric acid, phosphoric acid, zinc chloride, or benzene sulphonic acid, of appropriate glycols.  A mono-methyl derivative is prepared by dehydration of a mixture of propylene and ethylene glycols; a mono-ethyl derivative by dehydration of a mixture of 1, 2-butylene glycol, and ethylene glycol; a dimethyl derivative from a mixture of 2, 3-butylene glycol and ethylene glycol or from propylene glycol alone; a diethyl derivative by dehydration of 1, 2-butylene glycol; an ethyl-methyl derivative from a mixture of 1, 2-butylene glycol and propylene glycol; a trimethyl derivative from a mixture of 2, 3-butylene glycol, and propylene glycol; and a tetramethyl derivative from 2, 3-butylene glycol alone, or from isobutylene glycol alone. Specifications 259,265, 277,089, 280,990, 323,790, [all in Class 2 (ii), Cellulose &c.], 340,436, 370,430, 371,461, and 389,823 also are referred to.ALSO:According to the Provisional Specification, plastic compositions, moulding powders and the like are produced from solutions containing cellulose derivatives and alkylated 1, 4-cyclotetramethylene dioxides, for example the mono-, di-, tri-, tetra-, or high methylated or ethylated cyclotetramethylene dioxides, or the corresponding compounds containing higher alkyl groups such as propyl, isopropyl, butyl isobutyl, or isoamyl groups.  The compositions may contain other low or high boiling solvents and/or diluents, also other constituents such as dyestuffs, pigments, resins, and substances reducing flammability.