GB334567A - Improvements in the production of lacquers and other coatings for absorptive material - Google Patents

Abstract

334,567. Johnson, J. Y., (I. G. Farbenindustrie. Akt.-Ges.). May 6, 1929. Ink.-Lacquers and like coatings, suitable for application, for example by printing, to wood, natural or artificial leather, paper, textiles, &c., are prepared by emulsifying solutions of waterinsoluble cellulose derivatives in substantially water-insoluble organic solvents, with aqueous solutions of water-soluble colloids other than albumens, and adding softening agents either to one or both of the solutions or to the emulsions obtained. The solvents employable include hydrocarbons, difficultly water-soluble ketones, esters such as ethyl, butyl, or amyl acetate, alcohols such as butanol or cyclohexanol, higher glycol derivatives such as the acetates of ethylene- or propylene-glycol, mono-ethyl- or isopropyl-ether, and homologues of dioxane. The solvents may also contain a proportion of substances such as ethylene-glycol-mono-butyl-ether of small volatility. The water-soluble colloids include polymerized vinyl alcohols, starch, urea-formaldehyde resins, and ammonium salts of conversion products of phenol-formaldehyde condensation products with halogenated fatty acids. An example of such conversion product is that obtainable by condensing phenol and formaldehyde in the presence of hydrochloric acid, heating the product to 80‹ C. with an equal quantity of chloracetic acid and twice the quantity of caustic soda solution of 40‹ Be, and filtering and acidifying the solution. Water-soluble cellulose derivatives such as methyl cellulose may also be employed but only in conjunction with other emulsifying agents or wetting agents. Softening agents referred to are triaryl phosphates, camphor, phthalic esters, and castor oil. Fillers such as lithopone, slate meal, graphite, asbestos powder, and sawdust, or colouring materials may be incorporated. Wetting or emulsifying agents such as Turkey-red oils, alkyl-naphthalene sulphonates, or neutral soaps may be employed in conjunction with the watersoluble colloids. Examples are as follows :-(1) 110 parts of a solution containing 20 parts of collodion cotton, 10 parts of butanol, 5 parts of a resinous cyclohexanone polymerization product, 62 parts of ethylene-glycol mono-butyl-ether. 10 parts of tricresyl phosphate, and 3 parts of Lithol fast scarlet R powder are emulsified with 94.5 parts of water containing 5 parts of methyl cellulose and 0.5 parts of a mixture of sodium mono- and di-butyl naphthalene sulphonates or either of these compounds and glue; 50 or 60 parts of water are subsequently added. (2) A solution similar to that in (1) but containing trinormalbutyl phosphate in place of tricresyl phosphate is emulsified in a solution containing a watersoluble urea-formaldehyde condensation product in addition to the above ingredients. (3) A solution containing 10 parts of acetone-soluble acetyl cellulose, 80 parts of cyclohexanone, 5 parts each of titanium white and the neutral ester of ethylene-glycol-monomethyl-ether and phthalic acid is emulsified with 150 parts of water containing 5 parts of methyl cellulose and 0.5 parts of a mixture of sodium-butyl-naphthalene sulphonate and glue. (4) A solution containing 10 parts of a benzene-soluble ethyl cellulose, 35 parts of benzene, 20 parts of toluene, 20 parts of xylene, 10 parts of ethylene-glycol-monoethyl-ether acetate, 5 parts of commercial ethyl alcohol, 4 parts of tricresyl phosphate, and 2 parts of Lithol fast scarlet R powder are emulsified with a dispersion of 25 parts of shellac, 5 parts of borax, and 5 parts of methyl cellulose in 70 parts of water, and a further 60 parts of water gradually added. The Provisional Specification contains the following example :-100 parts of a solution containing 4-8 per cent of nitro cellulose, ethylene-glycol-monoethyl-ether acetate, benzyl alcohol, ethyl acetate, methyl acetate, and 1-5 parts of Lithol fast scarlet R are emulsified with 250 parts of an aqueous 5 per cent methyl-cellulose solution, and 5-10 parts of dibutyl phthalate stirred in. Specifications 285,355; and 298,705, [Class 100 (ii), Printing processes &c.], are referred to.