Patent GB-322780-A (GB)
Title: Improvements in the manufacture and production of lacquers and the like
IPC: C09D101/18
Filed: 1928-08-08
Abstract: 322,780. Johnson, J. Y., (I. G. Farbenindustrie Akt.-Ges.). Aug. 8, 1928. Addition to 301,133. Compositions containing cellulose derivatives. -Lacquers, artificial masses, &c., are prepared by replacing the simple varnishes described in the parent Specification by gum varnishes, i.e. solutions of natural or artificial resins obtainable by melting the said resins in drying oils, which may contain drying agents, e.g. metal resinates, napthenates, or oleates and/or suitable diluents, dyestuffs or pigments, an addition of a difficultly volatile plastifiers having a boiling point above 150‹ C also being made. The condensation products of urea and formaldehyde can be replaced by similar products obtainable from thiourea, or mixtures thereof with urea, and formaldehyde, or by those obtainable from dimethylolurea, and the nitrocellulose may be replaced by other esters and ethers of cellulose. Suitable plastifiers include cyclohexyl acetate; the portion of the products of catalytic hydrogenation of the oxides of carbon boiling above 150‹ C consisting mainly of higher alcohols, ketones and esters; the di-ethers and di-esters of ethylene glycol; esters of mono-ethers of ethylene glycol; alkyl, aryl or aralkyl esters of phosphoric acid and of aromatic or aliphatic dibasic acids or of aromatic monobasic acids such as oxalic, succinic, adipic, tartaric, phthalic or benzoic acids. The properties of the lacquers &c. are modified by variation of the composition of the gum varnishes, e.g. for elastic coatings non-drying or slowly drying fatty oils, such as castor oil may be added, part of which may have been previously treated with gaseous oxidizing agents. According to examples, (1) a solution of urea-formaldehyde resin in butyl alcohol is mixed with a solution of nitrocellulose and a gum varnish, obtained by remelting Congo copal in boiled linseed oil at 280‹-300‹ C and adding cobalt resinate after cooling to 200‹ C, in a mixture of butyl acetate, ethyl alcohol and toluene. A plastifier consisting of the oily fraction boiling between 150‹-190‹ C obtained by catalytic hydrogenation of the oxides is then added. The gum varnish may be prepared from Chinese wood oil, (2) the artificial resin solution described in example 1 is mixed with a solution of nitrocellulose and gum varnish, obtained in a similar manner from Kauri copal and boiled linseed oil, the drier being manganese resinate, in the same solvent mixture. The plastifier may be di-isobutyl phthalic ester, or the phosphoric acid esters of phenols, such as tricresyl phosphate, (3) a solution of nitrocellulose in butyl acetate. cyclohexyl acetate acting as a plasticizer, ethyl alcohol and toluene is treated with a gum varnish consisting of melted Zanzibar copal and boiled linseed oil, with the addition of cobalt resinate. After solution has occurred, a solution in n-butyl alcohol of a urea-formaldehyde resin prepared from dimethylol-urea is added. The above condensation product may be replaced by similar products from a mixture of urea, thiourea and formaldehyde, or thiourea and formaldehyde. or from dimethylol-thiourea. (4) a nitrocellulose solution as in example 3 is incorporated with a mixture of castor oil, which has been blown with air at 140‹ C, and a gum varnish obtained by melting Benguela copal with China wood oil, cobalt resinate being added. After dissolution, a solution in amyl alcohol of a resin prepared according to Specification 261,029, [Class 2 (iii), Dyes &c.], is added.