Patent GB-835883-A (GB)
Title: Corrosion preventive composition based on a modified phenol-formaldehyde resin
IPC: C09D5/08
Filed: 1956-05-15
Abstract: A corrosion-preventive composition for metal (e.g. steel) surfaces comprises (i) 2-15% (by weight) of a micro-crystalline wax of m.p. 140-170 DEG  F., (ii) 10-50% of a metal salt of a phenolformaldehyde resin, where the resin is modified either by (a) a fatty acid selected from saturated and mono-olefinic aliphatic monocarboxylic acids having at least 8C in the presence of 1/8 -2 mols. per mol. of said higher fatty acid of a fatty alcohol selected from saturated and mono-olefinic aliphatic monohydric alcohols having at least 8C, or by (b) an ester of such an acid with such an alcohol, (iii) 5-40% of an aluminium pigment, and (iv) 0.1-3% of a substantially neutral addition product of isoamyl acid phosphate with a primary fatty amine containing 8-18C.  The preferred compounds are (i) petrolatum wax; (ii) the calcium salt of a degras-modified reaction product of a monoalkyl mono-hydric phenol having 4-12C in the alkyl group (e.g. a ,a ,g ,g -tetramethyl butyl phenol) with formaldehyde; (iii) Al powder or a paste of Al flake with mineral spirits; (iv) the amine is preferably cocoamine (primarily mono-lauryl amine). Many other possible constituents are listed.  Solvents specified are hexane, benzene, petroleum ether, Stoddard solvent and naphtha.  The compositions may be applied by dipping, spraying, brushing, coating, rolling and wiping.  In a comparative example there is used instead of the Al pigment a mixture of TiO2, ZnO, lamp black and mica.ALSO:A corrosion preventive composition for metal (e.g. steel) surfaces comprises (i) 2-15% (by weight) of a micro-crystalline wax of m.p. 140-170 DEG  F.; (ii) 10-50% of a metal salt of a phenol-formaldehyde resin, where the resin is modified either by (a) a fatty acid selected from saturated and mono-olefinic aliphatic monocarboxylic acids having at least 8 C in the presence of 1/8 -2 mols. per mol. of said higher fatty acid of a fatty alcohol selected from saturated and mono-olefinic aliphatic monohydric alcohols having at least 8 C, or by (b) an ester of such an acid with such an alcohol; (iii) 5-40% of an aluminium pigment; and (iv) 0.1-3% of a substantially neutral addition product of isoamyl octyl acid phosphate with a primary fatty amine containing 8-13 C.  Compounds disclosed are the following: (i) petrolatum wax; (ii) Ca, Na, K, Li, Be, Ca, Mg, Ba, Sr, Zn, Ag, Hg, Cd, Al, Bi, Sn, Pb, Cu, V, Sb, Cr, Mn, Fe, Co or Ni salts of the reaction product of a mono alkyl monohydric phenol having 4-12 C in the alkyl group (e.g. a ,a ,g ,g -tetramethyl butyl phenol) with formaldehyde, which is modified with (a) caprylic, pelargonic, nonylenic, capric, decylenic, undercylic, undecylenic, lauric, myristic, palmitic, stearic, oleic, ricinoleic, arachidic, behenic, erucic, brassidic, carnaubic, cerotic, melissic, or psyllic acids in the presence of n-octyl, 2-ethyl hexyl, octenyl, nonyl, decyl, decenyl, undecyl, undecenyl, lauryl, myristyl, cetyl, stearyl, oleyl, ricinoleyl, eicosyl, eicosenyl, docosyl, erucyl, ceryl or melissyl alcohols; or with (b) degras, lanolin, sperm oil, spermaceti, or waxes such as bees, carnauba, candelilla, Chinese insect, cottonseed, flax, ouricury, montan, sugar cane, or seaweed waxes; (iii) Al powder or a paste of Al flake with mineral spirits; (iv) the amine is preferably cocoamine (primarily mono-lauryl amine) but may be capryl, lauryl, myristyl, palmityl or stearyl amine.  Solvents specified are hexane, benzene, petroleum ether, Stoddard solvent and naphtha.  In a comparative example there is used instead of the Al pigment a mixture of TiO2, ZnO, lamp black and mica.