Patent GB-355271-A (GB)
Title: Improvements in coating compositions and methods of making and applying same
IPC: B05D7/26
Filed: 1930-02-14
Abstract: Quick-drying coating compositions, free from cellulose derivatives and adapted to be applied one on top of another without intermediate drying, and suitable for use in coating car bodies to form the layers intermediate between the priming-coats and the top pyroxylin coats, consist of mixtures of pigments and a polymerizable binder such as a polyhydric alcohol polybasic acid resin binder, or an oil varnish in which the ratio of the oil absorption capacity of the pigments to the oil or oil acid contents of the binder falls within a definite range. The synthetic resin binders may be made from glycerol, phthalic anhydride, linseed or wood oil or acids derived therefrom and rosin. The oil type binders consist of varnishes prepared from linseed, wood, perilla, soya bean, and fish oils with natural resins or synthetic resins such as ester gums, Amberol, &c.  The pigments or fillers may contain iron oxide, lampblack, asbestine, China clay, blanc fixe, litharge, lithopone, barytes, silica, whiting, talc, titanox, ochre, zinc oxide, or lead carbonate. Solvents such as naphtha, xylene, toluene, turpentine and high-boiling esters may be used to give compositions of the putty type or suitable for spraying. Lead and manganese driers, eugenol, stearine pitch, or creosol and softeners such as dibutyl phthalate may be added.ALSO:Resins for use in quick-drying coating compositions are made by heating the following mixtures until attainment of the acid number given: (A) glycerine 23,1 parts, linseed oil acids 30,8, phthalic anhydride 46,1, acid number 52; (B) glycerine 19,3, linseed oil acids 29,6, phthalic anhydride 37,6, China wood oil 13,5, acid number 30; (C) glycerine 16,72, phthalic anhydride 26,91, resin 18,17, China wood oil acids 38,20, acid number 20.  In making Resin (C) the glycerine and phthalic anhydride are first heated to form a homogeneous product, and the resin and oil acids added successively. p ALSO:Quick-drying coating compositions, free from cellulose derivatives and adapted to be applied one on top of another without intermediate drying, and suitable for use in coating car bodies to form the layers intermediate between the priming coats and the top pyroxylin coats, consist of mixtures of pigments and a polymerizable binder such as a polyhydric alcohol polybasic acid resin binder, or an oil varnish in which the ratio of the oil absorption capacity of the pigments to the oil or oil acid contents of the binder falls within a definite range.  The synthetic resin binders may be made from glycerol, phthalic anhydride, linseed or wood oil or acids derived therefrom and rosin.  The oil type binders consist of varnishes prepared from linseed, wood, perilla, soya bean, and fish oils with natural resins or synthetic resins such as ester gums, Amberol, &c.  The pigments or fillers may contain iron oxide, lampblack, asbestos, China clay, blanc fixe, litharge, lithopone, barytes, silica, whiting, talc, titanox, ochre, zinc oxide, or lead carbonate. Solvents such as naphtha, xylene, turpentine, and high-boiling esters may be used to give compositions of the putty type or suitable for spraying.  Lead and manganese driers, eugenol, stearine pitch, or creosol and softeners such as dibutyl phthalate may be added.