Patent GB-453657-A (GB)
Title: Improvements in and relating to coating and plastic compositions
Filed: 1935-03-15
Abstract: A coating-composition or a plastic composition contains a small proportion of an organic mercury compound of the formula R--Hg--X, in which R is a monovalent aromatic hydrocarbon radical free from any substituent of an acid-forming or salt-forming character, and X is a hydroxyl group or an acid radical.  These mercury compounds act as mould-inhibitors, and effective quantities vary from 0,01--2,0 per cent of the film solids. They may be added as a powder to the mill base, to a thinner, or to the finished coating-composition, or as a suspension in water or in an organic liquid.  They may also be produced in situ by the reaction of solutions mixed with a paint medium.  Compounds of the formula C6H5--Hg--X are preferable, but the phenyl group may be replaced by o-, p-, or m-tolyl, xylyl, cumenyl, cymyl, p-ethylphenyl, 2-mesityl, a - or b -naphthyl, p-benzyl-phenyl or p-phenyl-phenyl, or by any other aryl group having its free valency directly attached to a nuclear carbon atom.  X may be, for example, a hydroxyl group or a chloride, sulphate, arsenate, bromide, iodide, cyanide, nitrate, phosphate, oleate, benzoate, salicylate, thiosalicylate, cyanate, thiocyanate, propionate, acetate, butyrate, decanoate, stearate or a -naphthionate radical.  Pigments such as titanium oxide, calcium or barium base titanium pigments, lithopone, zinc sulphide, antimony oxide, chrome yellow, chrome green, Prussian blue and carbon black, and extenders such as talc, whiting, barytes, silica, asbestine and china clay may be added.  Specified vehicles for coating compositions cellulose acetate, propionate and butyrate, crotyl-, ethyl-, and benzylcellulose, while the mercury compounds may be used in cast or moulded plastics made from polyhydric alcoholpolycarboxylic acid resins, vinyl resins, ureaaldehyde resins, phenol-aldehyde resins, cellulose esters and ethers, with or without fillers such as talc, asbestos, clay, mica, gypsum, wood flour, carbon black or titanium dioxide. According to examples, coating compositions comprise: (1) barium base titanium pigment, asbestine, phthalic anhydride-linseed oil acidsglycerol resin, drier, thinner and phenylmercuric hydroxide; (2) barium base titanium pigment, antimony oxide, phthalic anhydride-linseed oil acids-glycerol resin, drier, thinner and phenylmercuric acetate.  According to the Specification as open to inspection under Sect. 91, the monovalent aromatic hydrocarbon radical R need not be an unsubstituted radical, but this subject-matter does not appear in the Specification as accepted.ALSO:A coating-composition or a plastic composition contains a small proportion of an organic mercury compound of the formula R--Hg--X, in which R is a monovalent aromatic hydrocarbon radical free from any substituent of an acid forming or salt forming character, and X is a hydroxyl group or an acid radical.  These mercury compounds act as mould-inhibitors, and effective quantities vary from 0,01--2,0 per cent of the film solids. They may be added as a powder to the mill base, to a thinner, or to the finished coating-composition, or as a suspension in water or in an organic liquid.  They may also be produced in situ by the reaction of solutions mixed with a paint medium.  Compounds of the formula C6H5--Hg--X are preferable, but the phenyl group may be replaced by o-, p-, or m-tolyl, xylyl, cumenyl, cymyl, p-ethylphenyl, 2-mesityl, a - or b -naphthyl, p-benzyl-phenyl or p-phenylphenyl, or by any other aryl group having its free valency directly attached to a nuclear carbon atom.  X may be, for example, a hydroxyl group or a chloride, sulphate, arsenate, bromide, iodide, cyanide, nitrate, phosphate, oleate, benzoate, salicylate, thiosalicylate, cyanate, thiocyanate, propionate, acetate, butyrate, decanoate, stearate or a -naphthionate radical.  Pigments such as titanium oxide, calcium or barium base titanium pigments, lithopone, zinc sulphide, antimony oxide, chrome yellow, chrome green, Prussian blue and carbon black, and extenders such as talc, whiting, barytes, silica, asbestine and china clay may be added.  Specified vehicles for coating-compositions include drying oils, natural and synthetic resins, nitro-cellulose, cellulose acetate, propionate and butyrate, crotyl-, ethyl-, and benzyl-cellulose, casein, glue, starch, water-glass, and oil-water emulsions, while the mercury compounds may be used in cast or moulded plastics made from polyhydric alcoholpolycarboxylic acid resins, vinyl resins, urea-aldehyde resins, phenol-aldehyde resins, natural resins, cellulose esters and ethers, polymerized oils, rubber or synthetic rubber, with or without fillers such as talc, asbestos, clay, mica, gypsum, wood flour, carbon black or titanium dioxide. According to examples, coating compositions comprise: (1) chrome green, barytes, asbestine, linseed oil, drier, thinner, and phenylmercuric chloride; (2) lithopone, asbestine, linseed oil, long oil varnish, mineral spirits and phenylmercuric oleate; (3) white lead, linseed oil, turpentine, drier and phenylmercuric nitrate; (4) iron oxides, china clay, linseed oil, drier, mineral spirits and phenylmercuric acetate; (5) calcium carbonate, china clay, casein, soda ash, water and phenylmercuric chloride; (6) barium base titanium pigment, heat-treated china wood oil, mineral spirits, metallic cobalt in drier solution, and phenylmercuric chloride; (7) barium base  titanium pigment, asbestine, phthalic anhydride-linseed oil acids-glycerol resin, drier, thinner and phenylmercuric hydroxide; (8) barium base titanium pigment, antimony oxide, phthalic anhydride-linseed oil acids-glycerol resin, drier, thinner and phenylmercuric acetate.  According to the Specification as open to inspection under Sect. 91, the monovalent aromatic hydrocarbon radical R need not be an unsubstituted radical, but this subject-matter does not appear in the Specification as accepted.ALSO:Plastic compositions contain as mould inhibitors a small proportion of an organic mercury compound of the formula R-Hg-X, in which R is a monovalent aromatic hydrocarbon radical free from any substituent of an acid forming or salt forming character, and X is a hydroxyl group or an acid radical.  Compounds of the formula C6H5-Hg-X are preferable, but the phenyl group may be replaced by o-, p-, or m-tolyl, xylyl, cumenyl, cymyl, p-ethylphenyl, 2-mesityl, b - or a -naphthyl, p-benzyl-phenyl or p-phenyl-phenyl, or by any other aryl group having its free valency directly attached to a nuclear carbon atom.  X may be, for example, a hydroxyl group or a chloride, sulphate, arsenate, bromide, iodide, cyanide, nitrate, phosphate, oleate, benzoate, salicylate, thio-salicylate, cyanate, thiocyanate, propionate, acetate, butyrate, decanoate, stearate or a -naphthionate radical.  The mercury compounds may be used for example in plastics made from natural resins, polymerized oils, rubber or synthetic rubber, with or without fillers such as talc, asbestos, clay, mica, gypsum, wood flour, carbon black or titanium dioxide. According to the Specification as open to inspection under Sect. 91, the monovalent aromatic hydrocarbon radical R need not be an unsubstituted radical, but this subject-matter does not appear in the Specification as accepted.