Patent GB-870460-A (GB)
Title: Process for the manufacture of pigmented artificial resin lacquers dispersible in aqueous media
IPC: C09D7/80
Filed: 1958-02-18
Abstract: Pigmented resin lacquers which are easily dispersible in aqueous media are prepared by dispersing an inorganic pigment other than carbon black in a lacquer containing (1) at least one organic solvent of at least limited miscibility with water and (2) a hardenable water-insoluble etherified methylol compound of a substance of amide character capable of forming a hardenable aminoplast with formaldehyde, and there is added before, during or after the dispersion of the pigment an emulsifying agent which is soluble in the lacquer and in water and which is an ethylene oxide condensation product of a water insoluble organic compound containing at least one reactive hydrogen atom.  Methylol compounds specified are those of urea, thiourea, guanidine, dicyandiamide, biuret, melamine, benzoguanamine, acetoguanamine and formoguanamine, which have been etherified with n-butanol, amyl alcohol, hexyl alcohol, cyclohexanol or benzyl alcohol. Excess of the etherifying alcohol may be used as the solvent, but may also be replaced by a water-immiscible solvent, e.g. 2-ethyl hexanol, benzine (b. pt. 140 DEG -200 DEG C.) and xylene as well as toluene, chlorobenzene, tetrahydronaphthalene and white spirit. The etherifying methylol compounds may also contain residues of carboxylic acids containing more than eight carbon atoms, e.g. pelargonic, lauric, myristic, oleic, stearic and soya-bean fatty acid, and in this modification the etherifying alcohol may be of low molecular weight e.g. methyl alcohol.  Pigments specified are titanium dioxide, ultramarine, cadmium sulphide, chrome yellow, gold bronze and iron oxides.  The emulsifying agent may be an ethylene oxide condensation product of a higher fatty acid or fatty acid amide, of an amine such as oleylamine, or of a mercaptan, and may be especially the reaction product of 10-100 molecular proportions of ethylene oxide and one molecular proportion of an alcohol containing more than eight carbon atoms or an alkyl phenol of which hydroabietyl alcohol, ricinoleic alcohol, octyl phenol and dodecyl phenol are especially useful of the many specified.  In Example (2), red iron oxide is ground in a mixture of xylene, solvent benzine and a melamine-formaldehyde condensate etherified with n-butanol, and there is added the condensation product of one molecular proportion of hydroabietyl alcohol and 26 molecular proportions of ethylene oxide to give a thixotropic pigment paste which is stirred into an oil-in-water emulsion in which the external phase is a solution in water of an emulsifying agent obtained by reacting ethylene oxide with hydroabietyl alcohol followed by treatment with 4, 41-diphenylmethane diisocyanate and the disperse phases are (1) a copolymer of styrene and butadiene; (2) a melamine-formaldehyde precondensate modified with n-butanol to which has been added a highly viscous silicone oil and (3) petroleum b. pt. 160 DEG -240 DEG C., and there is added more water and an ammonium nitrate solution to give finally a textile printing paste.ALSO:Pigmented resin lacquers, which are easily dispersible in aqueous media and are therefore suitable for making textile printing colours and pigment dye liquors, are made by dispersing an inorganic pigment other than carbon black in a lacquer containing (1) at least one organic solvent of at least limited miscibility with water and (2) a hardenable water-insoluble etherified methylol compound of a substance of amide character capable of forming a hardenable aminoplast with formaldehyde, and adding, before, during or after the dispersion of the pigment, an emulsifying agent soluble in the lacquer and in water and which is an ethylene oxide condensation product of a water-insoluble organic compound containing at least one reactive hydrogen atom. Methylol compounds specified are those of urea, thiourea, guanidine, dicyandiamide, biuret, melamine, benzoguanamine, acetoguanamine and formoguanamine, which have been etherified with n-butanol, amyl alcohol, hexyl alcohol, cyclohexanol or benzyl alcohol.  Excess of the etherifying alcohol may be used as the solvent, but may also be replaced by a water-immiscible solvent, e.g. 2-ethylhexanol, benzine (b.pt. 140 DEG -200 DEG C.), xylene, toluene, chlorobenzene, tetrahydronaphthalene or white spirit. The etherified methylol compounds may also contain residues of carboxylic acids containing more than eight carbon atoms, e.g. pelargonic, lauric, myristic, oleic, stearic or soya-bean fatty acid, and in this modification the etherifying alcohol may be of low molecular weight, e.g. methylalcohol.  Pigments specified are titanium dioxide, ultramarine, cadmium sulphide, chrome yellow, gold bronze and iron oxides.  The emulsifying agent may be an ethylene oxide condensation product of a higher fatty acid or fatty acid amide, of an amine such as oleylamine, or of a mercaptan, and may be especially the reaction product of 10-100 molecular proportions of ethylene oxide and one molecular proportion of an alcohol containing more than eight carbon atoms or of an alkyl phenol, of which hydroabietyl alcohol, ricinoleic alcohol, octyl phenol and dodecyl phenol are preferred. In Example 2 red iron oxide is ground in a mixture of xylene, solvent benzine and a melamine-formaldehyde condensate etherified with n-butanol, and there is added the condensation product of one molecular proportion of hydroabietyl alcohol and 26 molecular proportions of ethylene oxide to give a thixotropic pigment paste, which is stirred into an oil-inwater emulsion in which the external phase is a solution in water of an emulsifying agent obtained by reacting ethylene oxide with hydroabietyl alcohol followed by treatment with 4, 41-diphenylmethane diisocyanate and the disperse phases are (1) a copolymer of styrene and butadiene, (2) a melamine-formaldehyde precondensate modified with n-butanol to which has been added a highly viscous silicone oil, and (3) petroleum of b.pt. 160 DEG -240 DEG C., and there is added more water and an ammonium nitrate solution to give a textile printing paste which may be applied to the fabric by means of an engraved roller or a stencil.