Patent GB-1033129-A (GB)
Title: Metal primer
Inventor: MIELKE KARL-HEINZ
IPC: B05D7/16
Filed: 1964-10-30
Abstract: Thermosetting metal primers comprise aqueous dispersions of acrylonitrile copolymers and a triester of phosphoric acid with an alcohol containing 1 or 2 carbon atoms, said copolymer being derived from 50 to 75 parts by weight of acrylonitrile, 0 to 45 parts by weight of an acrylic ester of a C1- 4 alcohol or a methacrylic ester of a C1-3 alcohol and 0 to 15 parts by weight of acrylamide and/or methacrylamide, 2 to 10 parts by weight of acrylic and/or methacrylic acid, 0 to 40 parts by weight of butadiene or isoprene and 0 to 3 parts by weight of styrene or alkylated styrenes, optionally together with vinyl ethers, and viny esters.  The compositions may also contain stabilizers, thinners, pigments, corrosion inhibitors, cross-linking agents, e.g. polymer and copolymer of N-methylol ethers of acrylamide and methacrylamide, and other film-forming resins, e.g. condensates of formaldehyde with phenols, urea and melamine.  The preferred ester is triethyl phosphate.  In examples, acrylonitrile, butyl acrylate and methacrylic acid are copolymerized in aqueous dispersion in the presence of lauryl suphate and potassium persulphate and the latex compounded with (1) triethyl phosphate, sodium benzoate and sodium nitrite, together with (2) chrome yellow and red iron oxide, (3) alkali condensed phenol-formaldehyde resin, (4) alkali condensed phenol-formaldehyde resin, chrome yellow and red iron oxide, (5) alkali condensed phenol-formaldehyde resin and titanium dioxide, and (8) polymethacrylamide methylol methyl ether; acrylonitrile, styrene, methacrylic acid and methacrylamide are copolymerized in aqueous dispersion in the presence of ammonium persulphate and lauryl sulphate and the latex compounded with triethyl phosphate, sodium benzoate, sodium nitrite together with (6) melamine-formaldehyde resin and powdered mica, and (10) a copolymer of methacrylamide methylol methyl ether and acrylamide; and acrylonitrile, styrene, butadiene and methacrylic acid are copolymerized in aqueous dispersion in the presence of lauryl sulphate and potassium persulphate and the latex compounded with sodium benzoate, sodium nitrite together with (7) trimethyl phosphate, alkali condensed phenol-formaldehyde resin and red lead, and (9) triethyl phosphate, polymethacrylamide methylol ether, strontium chromate, red iron oxide and ammonium oxalate.ALSO:Metals of ceramics may be coated with thermosetting metal primers comprising aqueous dispersions of acylonitrile copolymers and a triester of phosphoric acid with an alcohol containing 1 or 2 carbon atoms, said copolymer being derived from 50 to 75 parts by weight of acrylonitrile, 0 to 45 parts by weight of an acrylic ester of a C1 - 4 alcohol or methacrylic ester of a C1 - 3 alcohol and 0 to 15 parts by weight of acrylamine and/or methacrylamide, 2 to 10 parts by weight of acrylic and/or methacrylic acid, 0 to 40 parts by weight butadiene or isopene and 0 to 30 parts by weight of styrene or alkylated styrenes.  The compositions may also comprise stabilisers, thinners, pigments, corrosion inhibitors and crosslinking agents, e.g. polymers of N-methylol acrylamides, and other film-forming resins, e.g. condensates of formaldehyde with phenold, urea and melamine.  In examples metals and ceramics are coated by immersing, spreading or spraying with compositions comprising acrylonitrile/butyl acrylate/methacrylic acid copolymers and (1) triethyl phosphate, sodium benzoate and sodium nitrite, together with (2) chrome yellow and red iron oxide, (3) phenol/formaldehyde resin, (4) phenol/formaldehyde resin, chrome yellow and red iron oxide, (5) phenol/formaldehyde resin and titanium dioxide and (8) polymethacrylamide methylol methyl ether; comprising acrylonitrile styrene methacrylic acid/methacrylamide copolymers, triethyl phosphate, sodium benzoate and sodium nitrite together with (6) melamine/formaldehyde resin and powdered mica, and (10) a methacrylamide methylol methyl ether/acrylamide copolymer; and comprising acrylonitrile/styrene/butadiene/methacrylic acid copolymers, sodium benzoate and sodium nitrite together with (7) trimethyl phosphate, phenol/formaldehyde resin and red lead, and (9) triethyl phosphate, polymethacrylamide methylol methyl ether, strontium chromate, red iron oxide and ammonium oxalate.  The coatings may be stoved.