Carboxylate-containing polymers for metal surface treatment

Abstract

The present invention relates to a composition for treating surfaces, comprising a copolymer as component A, synthesized from (meth)acrylic acid or salts thereof, a carboxylate-containing monomer and/or monomers containing groups containing phosphoric and/or phosphonic acid or salts thereof, and further comonomers if desired, to a passivating layer on a metal surface, which comprises component A, to a process for forming said passivating layer, and to the use of the composition of the invention to passivate a metal surface.

1 - 13 . (canceled)  
   
   
       14 . A Cr (VI) free composition for treating metal surfaces having a pH value of 1 to 6, comprising 
 a) at least one copolymer as component A, synthesized from 
 aa) 50 to 99.9% by weight of (meth)acrylic acid or salts thereof as component Aa;  
 and  
 ab) 01 to 50% by weight of monomers containing groups containing phosphoric and/or phosphoric acid or salts thereof, as component Ab2, and polymerizable with the monomers specified under aa) and ac);  
 ac) 0 to 30% by weight of further comonomers polymerizable with the monomers specified under aa) and ab), as component Ac;  
   b) water or a mixture of water and another, water miscible solvent, the fraction of water in such a mixture is at least 75% by weight, which is capable of dissolving, dispersing, suspending or emulsifying the polymer (component A), as component B;    c) at least one acid or one alkali metal or alkaline earth metal salt of said acid selected from the group consisting of phosphoric acid, sulfuric acid, sulfonic acids, formic acid, acetic acid, nitric acid, hydrofluoric acid, and hydrochloric acid, as component F.    
   
   
       15 . A composition according to  claim 14 , comprising further to components A, B and F compounds of Ce, Ni, Co, V, Fe, Zn, Zr, Ca, Mn, Mo, W, Cr and/or B; as component H.  
   
   
       16 . A composition according to  claim 15 , wherein the component H is selected from the group consisting of Fe, Zn, Zr and Ca.  
   
   
       17 . A composition according to  claim 14 , comprising further to components A, B and F wax-based derivatives based on natural or synthetic waxes.  
   
   
       18 . A composition according to  claim 15 , comprising further to components A, B, F and H wax-based derivatives based on natural or synthetic waxes.  
   
   
       19 . A composition according to  claim 17 , wherein the wax-based derivatives are waxes based on acrylic acid, polyethylene waxes, polytetrafluoroethylene (PTFE) waxes or wax derivatives or paraffins and their oxidation products.  
   
   
       20 . A composition according to  claim 14 , wherein the sulfonic acid as component F is a sulfonic acid selected from the group consisting of methanesulfonic acid, vinylsulfonic acid, allylsulfonic acid, m-nitrobenzenesulfonic acid, naphthalenesulfonic acid, and derivatives thereof.  
   
   
       21 . A composition according to  claim 14 , wherein component Aa is acrylic acid or a salt of acrylic acid, and component Ab2 is vinylphosphonic acid or methacrylic acid phophonoxyethyl ester.  
   
   
       22 . A composition according to  claim 14 , wherein the amount of acrylic acid is from 50 to 90% by weight.  
   
   
       23 . A composition according to  claim 14 , comprising further to components A, B and F 
 a) surface active additives, dispersants, suspension agents and/or emulsifiers as component C    and/or    b) at least one nitrogen base as component D    and/or    c) at least one salt, acid or base based on transition metal cations, transition metal oxo anions, fluorometallates or lanthanoides as component E    and/or    d) at least one further corrosion inhibitor as component G,    and/or    e) further auxiliaries and additives as component 1,    and/or    f) at least one complexing agent as component J,    and/or    g) further additives as component K    
   
   
       24 . A composition according to  claim 15 , comprising further to components A, B, F and H 
 a) surface active additives, dispersants, suspension agents and/or emulsifiers as component C    and/or    b) at least one nitrogen base as component D    and/or    c) at least one salt, acid or base based on transition metal cations, transition metal oxo anions, fluorometallates or lanthanoides as component E    and/or    d) at least one further corrosion inhibitor as component G,    and/or    e) further auxiliaries and additives as component 1, and/or    f) at least one complexing agent as component J, and/or    g) further additives as component K.    
   
   
       25 . A composition according to  claim 23 , wherein the surface active additives are surfactants selected from the group consisting of alkyl and alkenyl alkoxylates of the type R-EO n /PO m  in which R are linear or branched C 6 -C 30  alkyl radicals and EO is an ethylene oxide unit and PO is a propylene oxide unit and n and m independently of one another being >I and <100, the sequential arrangement of EO and PO being arbitrary, alkyl phenol ethoxylates, EO/PO block copolymers, alkyl ether sulfates and alkylammonium salts.  
   
   
       26 . A composition according to  claim 23 , wherein the corrosion inhibitor G is at least one corrosion inhibitor selected from the group consisting of butynediol, benzotriazole, aldehydes, amine carboxylates, aminophenols, nitrophenols, amino alcohols, aminobenzimidazole, aminoimidazolines, aminotriazole, benzimidazolamines, benzothiazoles, benzotriazole derivatives, esters of boric acid with various alkanolamines, carboxylic acids and their esters, quinoline derivatives, dibenzyl sulfoxide, dicarboxylic acids and their esters, diisobutenylsuccinic acid, dithiophosphonic acid, fatty amines, fatty acid amides, guanidine derivatives, urea and its derivatives, laurylpyridinium chloride, maleamides, mercaptobenzimidazole, N-2-ethylhexyl-3-aminosulfopropionic acid, phosphonium salts, phthalamides amine- and sodium-neutralized phosphoric esters of alkyl alcohols, and also these phosphoric esters themselves, phosphoric esters of polyalkoxylates, phosphoric esters of polyethylene glycol, polyetheramines, sulfonium salts, sulfonic acids, thioethers, thioureas, thiuramide sulfides, cinnamic acid and its derivatives, zinc phosphates and zinc silicates, zirconium phosphates and zirconium silicates and alkynediol alkoxylates.  
   
   
       27 . A composition according to  claim 23 , wherein the corrosion inhibitor G is at least one corrosion inhibitor selected from the group consisting of butynediol, benztriazole and alkynediol alkoxylates.  
   
   
       28 . A composition according to  claim 23 , wherein the component I is a conductivity pigment.  
   
   
       29 . A composition according to  claim 23 , wherein the component J is a complexing agent.  
   
   
       30 . A Cr (VI) free process for forming a passivating layer on a metal surface, wherein the metal surface is contacted with a composition according to  claim 14 .  
   
   
       31 . A Cr (VI) free process for forming a passivating layer on a metal surface, wherein the metal surface is contacted with a composition according to  claim 15 .  
   
   
       32 . A process according to  claim 30 , wherein the metal surface comprises aluminum or aluminum alloys or zinc or zinc alloys.  
   
   
       33 . A process according to  claim 30  comprising the following steps: 
 a) optionally, cleaning the substrate metal surface to remove oils, fats, and dirt,    b) optionally, washing with water,    c) optionally, pickling to remove rust or other oxides,    d) optionally, washing with water,    e) contacting the metal surface with a composition according to  claim 14 ,    f) optionally, washing with water,    g) optionally, after treatment.    
   
   
       34 . A process according to  claim 33 , wherein the process is a no-rinse process comprising the following steps: 
 a) optionally, cleaning the substrate metal surface to remove oils, fats, and dirt,    b) optionally, pickling to remove rust or other oxides,    c) contacting the metal surface with a composition according to  claim 14 ,    d) optionally, after treatment    
   
   
       35 . A process according to  claim 30 , wherein the contacting is effected by spraying, rolling or dipping methods.  
   
   
       36 . A passivating layer on a metal surface, obtainable by a process according to  claim 30 .  
   
   
       37 . A passivating layer according to  claim 36 , whose thickness is <3 μm.  
   
   
       38 . A surface composed of a metal surface and a passivating layer according to  claim 36 .  
   
   
       39 . A system on a metal surface comprising a passivating layer X according to  claim 36  and further coating films Y.  
   
   
       40 . A process of forming a coating system comprising a passivating layer X and further coating films Y, comprising the steps of: 
 forming a passivating layer X according to  claim 36 ,    coating the passivating layer.