Liquid compositions for the treatment of metal surfaces

Abstract

Liquid compositions for the treatment of metal surfaces comprising: (A) a compound having formula (I): (B) a fluorinated fluid, liquid at room temperature, having boiling point in the range 50° C.-250° C.

1 . Non aqueous compositions, limpid at room temperature, comprising: 
 (A) a fluorinated compound having the following general formula:                           wherein: 
 T=(CH 2 CH 2 O) k , (C 3 H 6 O) k′  wherein 
 k and k′ are integers in the range 0-10 extremes included, preferably 0-4;  
 
 X, Y, X 1 , Y 1 , equal to or different from each other are independently the one from the other H; NO 2 ; C 1 -C 4  alkyl; C 1 -C 4  alkoxy, with the proviso that at least one of X, Y, X 1 , Y 1  is equal to NO 2 ;  
 m′ and n′ are integers, selected so that the number average molecular weight of the perfluoropolyether chain formed by the units with m′ and n′ indexes is from 66 to 10,000, preferably from 300 to 4,000;  
   (B) a fluorinated fluid, liquid at room temperature, having boiling point in the range 50° C.-250°, preferably 50° C.-130° C., selected from the compounds having one of the following structures, and/or mixtures thereof:    R′—R f —R  (II)    wherein: 
 R′=—(O) n0 O—C n F 2n H, n being an integer from 1 to 4, preferably 1 or 2; n0 is equal to 0, 1;  
 R is selected between —C n F 2n H, —C m F 2m+1 ; wherein: 
 in the R, R′ end groups one fluorine atom is optionally substituted with one chlorine atom;  
 n in R is as defined in R′; m is an integer from 1 to 3;  
 
 R f  is selected from the following: 
 linear or branched perfluoroalkylene from 2 to 12 carbon atoms, containing at least one ether oxygen atom, in this case n0 in R′ is preferably equal to zero;  
 perfluoropolyoxyalkylene comprising units statistically distributed in the chain, selected from the following: 
 (CFXO) wherein X=F or CF 3 ;  
 (CF 2 (CF 2 ) d O) wherein d is an integer comprised between 1 and 3;  
 (C 3 F 6 O);  
  when R f  is perfluoropolyoxyalkylene n0 in R′ is preferably equal to 1;  
 R f   1 —O—R H   (III)  
 
 
   wherein: 
 R f   1  is a linear or branched perfluoroalkyl radical, optionally containing ether oxygen atoms, preferably having C Q F 2Q+1  structure, wherein Q is an integer from 4 to 7;  
 R H  is a C P H 2P+1  hydrogenated radical wherein p is an integer from 1 to 10, preferably from 1 to 4.  
   
     
     
         2 . Compositions according to  claim 1 , wherein in the component (A) m′ is an integer comprised between 0 and 80, extremes included; n′ is an integer comprised between 0 and 20, extremes included, with the proviso that both be not contemporaneously zero; the m′/n′ ratio preferably being from 0.5 to 4 n′ being different from zero.  
     
     
         3 . Compositions according to claims  1 - 2 , wherein the number average molecular weight of the perfluoropolyether chain formed by the units with m′ and n′ indexes is comprised between 1,500 and 2,500.  
     
     
         4 . Compositions according to claims  1 - 3 , wherein in component (A) X=Y=X 1 =Y 1 =NO 2 ; or X=X 1 =NO 2  and Y=Y 1 =H; k and k′ being equal to zero.  
     
     
         5 . Compositions according to claims  1 - 4 , wherein in the formula (II) compounds of component (B) R is selected from the following: —CF 2 H, —CF 2 CF 2 H, —CFHCF 3 .  
     
     
         6 . Compositions according to  claim 5 , wherein the formula (II) compounds have a number average molecular weight from 200 to 800, n0 of R′ is equal to 1, R f  is a (per)fluoropolyether chain having one of the following structures: 
 1) —(CF 2 O) a —(CF 2 CF 2 O) b —
 when a is different from zero, then b/a is comprised between 0.3 and 10, extremes included; when a is equal to zero b is an integer as defined below;  
 R=—C n F 2n H;  
 
 2) —(CF 2 —(CF 2 ) z′ —CF 2 O) b′ —
 wherein z′ is an integer equal to 1 or 2; b′ is as defined below;  
 
 3) —(C 3 F 6 O) r —(C 2 F 4 O) b —(CFL 0 O) t —
 L 0 =—F, —CF 3 ;  
 when b and t are different from zero r/b=0.5-2.0 (r+b)/t=10-30 and all the units with r, b, and t indexes are present;  
 or b=t=0 and r complies with the proviso mentioned below;  
 or b=0 and r and t are different from zero;  
 
 a, b, b′, r, t, are integers such that, or whose sum is such that the formula (II) compounds containing the bivalent radical R f  have boiling point in the above range.  
 
     
     
         7 . Compositions according to claims  1 - 6 , wherein the component (A) amount soluble in component (B), expressed in % by weight, is comprised between 0.01% and 50%, preferably between 0.1% and 15%.  
     
     
         8 . Compositions according to claims  1 - 7 , wherein component (B) is in admixture with perfluorooxyalkylene or perfluoroalkyl fluorinated fluids (Component (C)), liquid at room temperature, wherein the end groups optionally contain one chlorine atom at the place of one fluorine atom.  
     
     
         9 . Compositions according to  claim 8 , wherein when the mixture of components (B) and (C) is used, the amount of component (C), expressed in percentage by weight with respect to (B)+(C), is from 0 to 50%, preferably from 0 to 30%.  
     
     
         10 . Use of the compositions according to claims  1 - 9 , to treat metal surfaces.  
     
     
         11 . Metal surfaces obtainable according to  claim 10.