Patent ID: 8372336
Filing Date: 2013-02-12
Classification: C02F,C09K,C10G,C23F

Abstract:
1. A method for protecting a metal surface from corrosion by contacting the metal surface with a corrosion-inhibiting product obtainable by a reaction of an alkoxylated fatty amine having the formula wherein R is a hydrocarbyl group having 8-24 carbon atoms; B is, independently, an alkyl group having 1-4 carbon atoms, a benzyl group, or the group (AO) n H, wherein each A, independently, is an alkylene group containing 2-4 carbon atoms; each n is, independently, at least 1 and the sum of all n is 2-30; each x, independently, is 2 or 3; and y is 0-3; or a partial or wholly quaternised derivative thereof; with a dicarboxylic acid derivative having the formula wherein D is —OH, —Cl, or —OR3, wherein R3 is a C1-C4 alkyl group; R2 is selected from the group consisting of a direct bond, an alkylene radical of formula —(CH 2 ) z —, wherein z is an integer from 1 to 10, a substituted alkylene radical wherein said alkylene radical with formula —(CH 2 ) z — is substituted by 1 or 2 —OH groups, the group —CH═CH—, and the o-phenylene group; optionally said reaction between the amine and the dicarboxylic acid derivative is being followed by a further reaction step wherein part or all of the nitrogen atoms are quaternised; and wherein the reaction product consists for more than 60% by weight of oligomers/polymers with two or more alkoxylated amine units, that are optionally quaternized, and one or more diacid/acid anhydride units and for more than 50% by weight of oligomers/polymers with two or more alkoxylated amine units, that are optionally quaternized, and two or more diacid/acid anhydride units; as a corrosion inhibitor for metal surfaces.