Patent GB-391769-A (GB)
Title: Improvements in or relating to the manufacture or treatment of products or articles having a basis of cellulose derivatives
IPC: C08J3/09
Filed: 1931-09-26
Abstract: Cyclic dimethylene ethers are used as solvents or softeners in the production of dopes, varnishes, plastics, moulding powders, filaments, films, and the like from cellulose esters or ethers, with or without natural or synthetic resins.  In the production of dopes, varnishes, and the like, the dimethylene ethers may be used in conjunction with other low, medium, or high boiling solvents, and/or non-solvent diluents, and there may be present also substances reducing flammability, e.g. brominated organic compounds.  Solutions for use in the production of filaments, films, &c. comprise dimethylene ethers with or without other solvents or diluents, and in wet spinning processes, the dimethylene ethers may be present in the coagulating bath in high concentration, for example, in the manner described in Specifications 179,234, [Class 2 (ii), Cellulose &c.], 340,324, and 340,325.  The dimethylene ethers may be employed also in the treatment of formed articles, e.g. filaments, yarns, films, fabrics and the like, for example, to diminish the tendency of fabrics to slip, split or ladder, to improve knotting properties, pliability, or extension of filaments, yarns, and the like, and to improve the tenacity of filaments by stretching processes.  Sizes for textile materials may contain dimethylene ethers.  The solvents are also used in processes involving absorption of liquid or solid materials by filaments, yarns, fabrics, and the like containing cellulose esters or ethers, for example, in processes involving the absorption of dyes, loading agents, mordanting agents, discharges, or delustring agents.  The following examples are given: (1) A cellulose acetate fabric is printed with a paste containing a dyestuff or pigment, diethylene glycol, water, 2 : 4-dimethyl dimethylene dioxide, and gum arabic.  (2) Cellulose acetate filaments are softened in an aqueous, alcoholic, or aqueous-alcoholic solution of dimethylene dioxide and stretched. (3) A solution of cellulose acetate in dimethylene dioxide, with or without water, is spun by the ordinary dryspinning method. (4) A solution of cellulose acetate in dimethylene dioxide, with or without water, is extruded into a coagulating bath comprising 35-40 per cent dioxane.  (5) Cellulose acetate dissolved in acetone is extruded into a 25-35 per cent solution of 2 : 4-dimethyl dimethylene dioxide.  (6) A lacquer comprises cellulose acetate, diphenylol propane formaldehyde resin, dimethylene dioxide, dibutyl tartrate, tricresyl phosphate, dioxane, and diacetone alcohol.  (7) An insulating lacquer comprises cellulose acetate, polyvinyl acetate, diphenylol propane, dimethylene dioxide, alcohol and benzene.  (8) An insulating composition comprises cellulose acetate, diphenylol propane formaldehyde resin, tricresyl phosphate, diphenylol propane, dimethylene dioxide, and methyl acetate.  (9) A lacquer comprises nitrocellulose, diphenylol propane formaldehyde resin, dibutyl phthalate, triphenyl phosphate, dimethylene dioxide, and butyl acetate.  (10) A plastic mass is obtained by incorporating cellulose acetate with tricresyl phosphate, monomethylated isomeric xylene sulphonamides, dimethylene dioxide, benzene and alcohol.  Dimethylene dioxide and its homologues are prepared by the process of Specification 374,134, or by subjecting an aldehyde or polymer thereof to self-etherification in the presence of etherifying catalysts, e.g. sulphuric acid, hydrochloric acid, phosphoric acid, ferric chloride, or zinc chloride.  A single aldehyde may be used, or a mixture of two aldehydes, for example, formaldehyde and acetaldehyde.  Specifications 259,265, 280,990, [both in Class 2 (ii), Cellulose &c.], 370,430, 371,461, and 389,823 also are referred to.ALSO:Cyclic dimethylene ethers are used as solvents or softeners in the production of dopes, varnishes and the like from cellulose esters and ethers, with or without natural or synthetic resins, Other low, medium, or high boiling solvents, non-solvent diluents, or substances reducing flammability, may be also present. Dimethylene ethers specified are dimethylene dioxide and 2 : 4-dimethyl dimethylene dioxide.  The following examples are included: A lacquer comprises cellulose acetate, diphenylol propane formaldehyde resin, dimethylene dioxide, dibutyl tartrate, tricresyl phosphate, dioxane, and diacetone alcohol.  An insulating composition comprises cellulose acetate, polyvinyl acetate, diphenylol propane, dimethylene dioxide, alcohol, and benzene.  An insulating composition comprises cellulose acetate, diphenylol propane formaldehyde resin, tricresyl phosphate, diphenylol propane, dimethylene dioxide, and methyl acetate.  A lacquer comprises nitrocellulose, diphenylol propane formaldehyde resin, dibutyl phthalate, triphenyl phosphate, dimethylene dioxide, and butyl acetate.ALSO:Cyclic dimethylene ethers are used as solvents or softeners in the production of plastic compositions, moulding powders &c. from cellulose esters or ethers, with or without natural or synthetic resins.  Other low, medium or high boiling solvents, non-solvent diluents or substances reducing flammability, may be also present.  Dimethylene ethers specified are dimethylene dioxide and 2 : 4-dimethyl dimethylene dioxide.  An example is included in which a plastic mass is obtained by incorporating cellulose acetate with tricresyl phosphate, mono-methylated isomeric xylene sulphonamides, dimethylene dioxide, benzene and alcohol.