Patent GB-1105140-A (GB)
Title: Production of surface coatings
Inventor: FINN STANLEY RUSSELL
IPC: C08L67/00
Filed: 1965-04-05
Abstract: A film-forming resin which is soluble or dispersible in aqueous basic solution comprises residues having an active hydrogen atom capable of reacting upon heating with aldehydes or ketones, or compounds yielding these on heating, said residues being residues of a phenolic compound, an aminoplast-forming compound, or of a cyclic ketone/aldehyde resin chemically incorporated into the resin. Suitable resins may be prepared, for example, (i) by partial replacement of the acid component of a polyester by a phenolic acid, e.g. a partial ester of a polyol and a phenolic acid may be reacted with a maleic or fumaric acid adduct of an unsaturated fatty acid or oil, or with a water-soluble alkyd resin and/or an acrylic or methacrylic acid copolymer, and (ii) by reaction of a water-soluble alkyd or epoxy resin or acrylic acid copolymer containing free hydroxy or carboxy groups with monomethylol- or monomethoxymethyl-urea, -melamine or -benzoguanamine or with a cyclic ketone-aldehyde resin containing free methylol groups.  In (i) the polyol may be glycerol or pentaerythritol; the phenolic acid may be salicylic acid, methylene bis-salicylic acid, p-hydroxybenzoic acid, 4:4-bis - (4 - hydroxyphenyl) pentanoic acid, sulphosalicylic acid, sulphonated methylene bissalicylic acid or bisphenol A monoacetic acid; the maleic adduct or alkyd resin may be copolymerized with styrene or vinyl toluene, and/or acrylic acid, methacrylic acid or maleic anhydride; and solubility may be increased by reaction with e.g. propane sultone or sulphosalicylic acid.  In examples a maleic anhydride adduct is reacted with in (1) a linseed fatty acid/4:4 - diphenylol - pentanoic acid/glycerol condensate, in (3) monoglycerol salicylate, in (4) the monoglyceride of the acid from bisphenol A monosodium and chloracetic acid, in (6) monomethylol melamine, and in (8) a cyclic ketone aldehyde resin; the products are dissolved in aqueous ammonia.  In Example (5) a linseed fatty acid/pentaerythritol/methylene bis-salicylic acid condensate is dissolved in aqueous ammonia containing propanol. In Example (7) monoglycerol salicylate is condensed with a copolymer of acrylic acid/2-ethylhexyl acrylate/methacrylic acid/ethyl acrylate (20/10/10/60) and the product dissolved in dimethylethanolamine in water/isopropanol/butoxyethanol solution. These solutions are used with and without "hexamine" present for coating by casting on to glass or foil or by electrodeposition on to steel panels.  The solution of Example 1 is used with carbon black as a paint.ALSO:Coating compositions comprise a film-forming resin, soluble in aqueous basic solution, which contains residues of a phenolic or amino-plas-forming compound or of a cyclic ketonealdehyde resin, said residues being capable of reacting, on heating, with aldehydes or ketones or compounds yielding these on heating (see Division C3).  In Examples films are cast onto glass or metal foil or electrodeposited onto steel panels from solutions optionally containing tetramethylene hexamine of such resins dissolved in aqueous ammonia.  The resins are derived from:-condensates of a linseed fatty acid/maleic anhydride adduct with [1] a linseed fatty acid/4:4-diphenylol pentanoic acid/glycerol condensate, [3] monoglycerol salicylate, [4] monoglycerol bisphenol A monoacetic acid ester, [6] monomethylolmelamine and [8] a cyclic ketone-aldehyde resin; and from [5] a linseed fatty acid/pentaerythritol/methylene bissalicylic acid condensate and [7] a condensate of monoglycerol salicylate with an acrylic acid/2-ethylhexyl acrylate / methacrylic acid / ethyl acrylate (20/10/10/60) copolymer.  The latter is dissolved in dimethyl ethanolamine/isopropanol/butoxyethanol.  The solution of [1] is used with C black as a paint.