Patent GB-1005788-A (GB)
Title: Non-glossy surface coatings
IPC: C09D167/08
Filed: 1962-04-13
Abstract: A surface coating consists of a heat-hardened film derived from a thermosetting resinous composition comprising at least 2% by weight of an aminoplast, up to 98% by weight of at least one other film-forming resin and between 0.1 and 5%, by weight of the resin solids, of a secondary or tertiary amine salt of an acid catalyst, said film being characterized in that the coating has a micro-wrinkled surface having an 85 DEG  Gardner gloss of not more than 15.  The film-forming resins cross-link with aminoplasts when heated with an acid catalyst, those specified being alkyd resins, polyesters, polyepoxyesters, and copolymers containing amide, alkylol N-substituted amide, carboxyl, hydroxyl or carboxylate groups, e.g. copolymers of vinyl or acrylic monomers with acrylamide, methacrylamide or N-methylol derivatives thereof. Specified aminoplasts are the condensates of formaldehyde with urea, melamine or benzoguanamine, optionally etherified. Specified acid-catalysts are toluene sulphonic acid, benzene sulphonic acid, sulphuric acid, phosphoric acid, boron trifluoride, ammonium dihydrogen phosphate and dimethyl acid pyrophosphate. Thickeners, e.g. organic compounds of montmovillonite clay, silica aerogels and castor oil and pigments, e.g. magnesium silicate, diatomaceous silica, aluminium silicate, calcium carbonate, finely-divided mica and barium sulphate.  The examples disclose film-forming compositions comprising: (I) an actylamide methyl methacrylate butyl acrylate copolymer, a polyester derived from 1 : 3-butylene glycol, adipic acid and phthalic anhydride, titanium dioxide, the triethylamine salt of p-toluene sulphonic acid and a butulated urea-formaldehyde resin; (II) a copolymer of methyl methacrylate, ethyl acrylate, butyl acrylate and acrylamide, a butylated urea-formaldehyde resin, the polyester of (I), modified bentonite and the triethylamine salt of p-toluene sulphonic acid, optionally with the addition of carbon black; (III) a copolymer of methyl methacrylate, ethyl acrylate and acrylamide, modified bentonite, titanium dioxide, a polyester, butylated urea-formaldehyde resin, the triethylamine salt of p-toluene sulphonic acid; (IV) the resins of Example (III), magnesium silicate and titanium dioxide; (V) an alkyd resin derived from glycerol, phthalic anhydride and coconut oil fatty acids, a butylated urea-formaldehyde resin and the triethylamine salt of p-toluene sulphonic acid; (VI) the copolymer of Example (II), a butylated urea-formaldehyde resin, a polyester derived from butylene glycol and adipic acid, titanium dioxide and the triethylamine salt of p-toluene sulphonic acid; (VII) (i) a modified butylated melamine-formaldehyde resin, an oil-modified alkyd resin, and triethylamine p-toluene sulphonate, (ii) a melamine-formaldehyde resin as in (i), an epoxy ester of dehydrated castor oil and triethylamine p-toluene sulphonate and (iii) a urea-formaldehyde resin, an oil-modified alkyd resin and triethylamine p-toluene sulphonate; (VIII) a butylated urea-formaldehyde resin, triethylamine p-toluene sulphonate and (a) a copolymer of methyl methacrylate, ethyl acrylate, butyl acrylate and acrylamide, (b) a copolymer of methyl methacrylate and acrylamide; and (IX) an interpolymer derived from styrene, methyl methacrylate, ethylacrylate, acrylic acid and acrylamide, butylated urea-formaldehyde, titanium dioxide and trimethylamine p-toluene sulphonate.ALSO:A process for making a surface coating film characterized by a microwrinkled surface having an 85 degrees Gardner gloss of not more than 15 comprises making a solution of film-forming resins adapted to become thermoset on heating with an acid catalyst, said resins comprising at least 2% by weight of an aminoplast, adding thereto between 0,1% and 5% by weight of the resin solids, of a secondary or tertiary amine salt of an acid catalyst, applying the composition to an article to form a film at least 0,5 mil thick, and heating said film to form a hard, thermoset matt coating.  In the examples, steel panels are coated by spraying with compositions comprising triethylamine p-toluene sulphonate and: (I) an acrylamidemethyl methacrylate-butyl acrylate copolymer, a polyester derived from 1 : 3-butylene glycol, adipic acid and phthalic anhydride, titanium dioxide, a butylated urea-formaldehyde resin, butanol and xylene; (II) a copolymer of methyl methacrylate, ethyl acrylate, butyl acrylate and acrylamide, a butylated urea-formaldehyde resin, the polyester of (I), modified bentonite and xylene; (III) a copolymer of methyl methacrylate, ethyl acrylate and acrylamide, modified bentonite, titanium dioxide, a polyester and butylated urea-formaldehyde resin; (IV) the resins of (III) magnesium silicate and titanium dioxide; (V) an alkyd derived from glycerol, phthalic anhydride and coconut oil fatty acid, a butylated urea-formaldehyde resin and butanol; (VI) the copolymer of (II), butylated urea-formaldehyde resin, titanium dioxide and a primary amine salt of p-toluene sulphonate; (VIII) (i) a modified butylated melamine-formaldehyde resin and an oil-modified alkyd; (ii) the melamine-formaldehyde resin of (i) and a dehydrated castor oil ester of an epoxy resin; (iii) urea-formaldehyde resin and an oil-modified alkyd; and (IX) an interpolymer derived from styrene, methyl methacrylate, ethyl acrylate, acrylic acid and acrylamide, butylated urea-formaldehyde and titanium dioxide. Carbon black, diatomaceous silica and organic pigments may also be included in the coatings.