Anti-skinning agents having a mixture of organic compounds and coating compositions containing them

Abstract

The invention relates to anti-skinning agents containing mixtures of organic compounds (combinations of additives), whereby the organic compounds are selected from the groups of organic hydroxylamines, and β-dicarbonyl compounds and/or selected derivatives of formic acid and also relates to compositions containing them, especially oxidatively drying paints or coating compositions.

What is claimed is:  
     
         1 . An anti-skinning agent comprising 
 a) an organic compound of formula (I)                          where    R 1  and R 2  mutually independently represent hydrogen, a linear or branched, saturated or unsaturated C 1 -C 20  aliphatic radical, which can optionally be mono- or polysubstituted, or a C 6 -C 12  aryl radical, a C 7 -C 14  araliphatic radical or a C 5 -C 7  cycloaliphatic radical, and either or both of    b) an organic compound of formula (II)                          where    R 3  represents hydrogen, a hydroxyl radical, a saturated or unsaturated C 1 -C 19  aliphatic radical, a C 1 -C 7  alkoxy radical, or an amine radical —NR 7 R 8 ,    R 4  represents hydrogen, hydroxyl radical, a saturated or unsaturated C 1 -C 19  aliphatic radical, a C 1 -C 7  alkoxy radical, or an amine radical —NR 9 R 10 ,    R 7  and R 8  mutually independently represent hydrogen or a C 1 -C 6  aliphatic radical,    R 9  and R 10  mutually independently hydrogen or a C 1 -C 6  aliphatic radical, and    c) an organic compound of formula (III)                          where    R 5  represents hydrogen, a hydroxyl radical or a C 1 -C 7  alkoxy radical and    R 6  represents hydrogen or an amine radical —NR 11 R 12 ,    R 11  and R 12  mutually independently represent hydrogen, C 1 -C 6  aliphatic radical, or C 5 -C 7  cycloaliphatic radical, or amine radical —NR 1 R 2  with the proviso that R 5  and R 6  are not simultaneously hydrogen.    
     
     
         2 . The anti-skinning agent of  claim 1  further comprising water and/or an organic solvent.  
     
     
         3 . The anti-skinning agent of  claim 1  wherein 
 R 3  represents a substituted C 1 -C 19  aliphatic radical, a substituted C 1 -C 7  alkoxy radical, or a substituted amine radical —NR 7 R 8 , and  
 R 4  represents , a substituted C 1 -C 19  aliphatic radical, a substituted C 1 -C 7  alkoxy radical, or a substituted amine radical —NR 9 R 10 ,  
 R 11  and R 12  mutually independently represent a substituted C 1 -C 6  aliphatic radical, or a substituted C 5 -C 7  cycloaliphatic radical, or a substituted amine radical —NR 1 R 2 .  
 
     
     
         4 . The anti-skinning agent of  claim 1  wherein the compounds of formula (I) to (III) are in the form of aqueous dispersions or emulsions.  
     
     
         5 . A composition of matter comprising the anti-skinning agent of  claim 1 .  
     
     
         6 . The composition of matter of  claim 5  wherein the amount of anti-skinning agent is between 0.001 and 2.0 wt. % based on the composition.  
     
     
         7 . The composition of matter of  claim 5  wherein the amount of anti-skinning agent is between 0.01 to 0.5 wt. %, based on the composition.  
     
     
         8 . The composition of matter of  claim 5  further comprising a pigment.  
     
     
         9 . The composition of matter of  claim 5  wherein the composition is a colorless or pigmented paint, a coating, a printing ink based on oxidatively drying binders, an oxidatively drying paint system, or a spraying agent in a printing ink.