Patent GB-407709-A (GB)
Title: Improvements in or relating to solutions, compositions, preparations and articles having a basis of cellulose derivatives
IPC: C08K5/06
Filed: 1932-08-19
Abstract: Dopes, varnishes, and the like, contain methylene ethylene ether and cellulose esters or ethers which are insoluble in a mixture consisting of 80 per cent methylene ethylene ether and 20 p  per cent water.  The cellulose derivative may be, for example, cellulose acetate having a high acetyl content, particularly an acetyl content of 56 up to 62.5 per cent.  The solutions may contain also natural or synthetic resins.  Methylene ethylene ether is a low boiling solvent, and may be used alone or in conjunction with other solvents and/or diluents, and particularly medium and/or high boiling solvents or plasticizers, a number of which are specified.  There may be present also dyestuffs, pigments, or substances adapted to reduce flammability, particularly tribromacetanilide.  In an example, a composition which forms flexible films and may be employed for coating rubber insulated cables comprises cellulose acetate (acetyl value 56--58 per cent), diphenylol propane formaldehyde resin, dibutyl tartrate, tricresyl phosphate, methylene ethylene ether, dioxane, and diacetone alcohol.  In another example, a composition useful as a lacquer or as insulation for electric conductors comprises cellulose acetate (acetyl value 56--58 per cent), diphenylol propane formaldehyde resin, tricresyl phosphate, diphenylol propane, methylene ethylene ether, and methyl acetate.  A composition for similar purposes comprises cellulose acetate (acetyl value 56--58 per cent), polymerized vinyl acetate, diphenylol propane, methylene ethylene ether, alcohol, and benzene.ALSO:Dopes, varnishes, film-forming solutions, and the like, contain methylene ethylene ether and cellulose esters or ethers which are insoluble in a mixture consisting of 80 per cent methylene ethylene ether and 20 per cent water.  The cellulose derivative may be, for example, cellulose acetate having a high acetyl content, particularly an acetyl content of 56 up to 62.5 per cent. The solutions may contain also natural or synthetic resins. Methylene ethylene ether is a low boiling solvent, and in the preparation of lacquers, dopes, varnishes and the like it may be used alone or in conjunction with other solvents and/or diluents, and particularly medium and/or high boiling solvents or plasticizers, a number of which are specified.  There may be present also dyestuffs, pigments, or substances adapted to reduce flammability, particularly tribrom-acetanilide.  Films are made either by dry or wet spinning processes from solutions of cellulose esters or ethers in methylene ethylene ether, which may contain, particularly in wet spinning processes, relatively small proportions of water.  In an example, a composition which forms flexible films and may be employed for coating rubber insulated cables comprises cellulose acetate (acetyl value 56--58 per cent), diphenylol propane formaldehyde resin, dibutyl tartrate, tricresyl phosphate, methylene ethylene ether, dioxane, and diacetone alcohol.  In another example, a composition useful as a lacquer or as insulation for electric conductors comprises cellulose acetate (acetyl value 56--58 per cent), diphenylol propane formaldehyde resin, tricresyl phosphate, diphenylol propane, methylene ethylene ether, and methyl acetate.  A composition for similar purposes comprises cellulose acetate (acetyl value 56--58 per cent), polymerized vinyl acetate, diphenylol propane, methylene ethylene ether, alcohol, and benzene.