Patent GB-411154-A (GB)
Title: Process for the manufacture of a plasticizer for lacquers, enamels and moulding compositions
IPC: C08G63/672
Filed: 1932-11-30
Abstract: As a plasticizer in lacquers and enamels containing nitrocellulose or cellulose acetate, particularly those containing nitrocellulose of high viscosity, there is employed the product obtained by heating a mixture of equimolecular proportions of diethylene glycol and phthalic anhydride to 110--150 DEG  C., preferably to 130 DEG  C., until the product has an acid number of not more than 112, preferably just below 24.  The reaction mixture may contain not more than ,05 per cent of any of the metals or metal compounds mentioned in Specification 410,837 or copper nitrate, whereby a colourless product is obtained.  The plasticizer may constitute over 50 per cent, in some cases up to 87 per cent, of the total solids in the lacquers. The lacquers combine the properties of a primer and a finishing coat. In examples the plasticizer is employed in lacquers containing nitrocelluloses of various viscosities using the following solvent mixtures: (1) for spraying lacquers: toluene, denatured ethyl alcohol, ethyl acetate, amyl acetate, ethyl lactate, and the monoethyl and monobutyl ethers of ethylene glycol; (2) for brushing lacquers: xylene, denatured ethyl alcohol, the monoethyl ether of ethylene glycol, ethyl lactate, H.I.F. naphtha, amyl alcohol, ethyl oxybutyrate and ethyl acetate.  Specification 405,054, [Group IV], is referred to.ALSO:A plasticizer for lacquers, enamels and moulding compositions is manufactured by heating a mixture of equimolecular proportions of diethylene glycol and phthalic anhydride to 110--150 DEG  C., preferably to 130 DEG  C., until the product has an acid number of not more than 112, preferably just below 24.  The process is preferably carried out in the presence of not more than ,05 per cent of any of the metals or metal compounds mentioned in Specification 410,837 or copper nitrate, e.g. ,0005 per cent of copper nitrate whereby a colourless product is obtained  The condensation is preferably effected in aluminium vessels and with agitation of the material.  The product is suitable for use in lacquers, enamels and moulding compounds containing nitrocellulose or cellulose acetate, particularly those containing nitrocellulose of high viscosity.  The plasticizer may constitute over 50 per cent, in some cases up to 87 per cent of the total solids in the lacquers. Lacquers containing the product combine the properties of a primer and a finishing coat.  Films containing the product and nitrocellulose may be made transparent, may be coloured as desired or may have pigments incorporated in them to render them opaque.  They may be moulded by the methods used for celluloid.  In examples the product is used as plasticizer in lacquers containing nitrocelluloses of various viscosities using the following solvent mixtures: (1) for spraying lacquers: toluene, denatured ethyl alcohol, ethyl acetate, amyl acetate, ethyl lactacte, and the mono ethyl and monobutyl ethers of ethylene glycol; (2) for brushing lacquers: xylene, denatured ethyl alcohol, the monoethyl ether of ethylene glycol, ethyl lactate, H.I.F. naphtha, amyl alcohol, ethyl oxybutyrate and ethyl acetate. Specification 405,054 is referred to.