Alkyd resin composition comprising silica

Abstract

Disclosed is an oxidatively drying alkyd resin composition and a method for preparing said composition. Said composition is obtained by admixing an aqueous silica sol into a substantially 100% alkyd resin being in a liquid state either at ambient temperature or at an elevated temperature. Said silica sol is added in an amount of 0.1-10% by weight calculated as 100% silica on 100% alkyd resin. The use of a said composition is in a further aspect disclosed.

1 - 11 . (canceled) 
     
     
         12 . A method of obtaining a composition comprising at least one oxidatively drying alkyd resin and at least one colloidal silica, wherein said method comprises addition under vigorous stirring and in an amount of 0.1-10% by weight calculated as 100% silica on 100% alkyd resin, of a colloidal silica to a 100% alkyd resin being in a liquid state at ambient or elevated temperature. 
     
     
         13 . The method according to  claim 12 , wherein said alkyd resin is in a liquid state at a temperature of 30-140° C. 
     
     
         14 . The method according to  claim 12 , wherein said silica is a sterically or electrostatically stabilized silica. 
     
     
         15 . The method according to  claim 12 , wherein said silica is salt free and/or free of counter ions. 
     
     
         16 . The method according to  claim 12 , wherein said silica is a silica sol. 
     
     
         17 . The method according to  claim 12 , wherein said silica is a siloxane, silazane or silan modified or treated silica. 
     
     
         18 . The composition according to  claim 12 , wherein said silica is present as silica nanoparticles. 
     
     
         19 . The method according to  claim 12 , wherein said method further and after said silica addition comprises an evaporation. 
     
     
         20 . The method according to  claim 19 , wherein said evaporation is performed under vacuum or reduced pressure 
     
     
         21 . The method according to  claim 19 , wherein said evaporation is performed at a temperature of 40-120° C. 
     
     
         22 . The method according to  12 , wherein said method further comprises a neutralization of said alkyd resin before or after said silica addition. 
     
     
         23 . The method according to  claim 22 , wherein said alkyd resin is at least partially neutralized. 
     
     
         24 . The method according to  claim 22 , wherein said neutralization is performed using an inorganic base, ammonia and/or an amine. 
     
     
         25 . The method according to  claim 22 , wherein said method further comprises addition of at least one surfactant or emulsifier. 
     
     
         26 . The method according to  claim 12 , wherein said method further comprises (a) neutralization with at least one inorganic base, at least one amine or ammonia, (b) addition of at least one surfactant or emulsifier and (c) addition of water. 
     
     
         27 . The method according to  claim 26 , wherein said method further comprises a phase inversion or homogenization yielding an alkyd emulsion. 
     
     
         28 . The method according to  claim 27 , wherein said method further comprises addition of at least one pigment, filler, levelling additive, flow additive and/or antifoaming. 
     
     
         29 . The method according to  claim 28 , wherein said method yields a decorative and/or protective coating. 
     
     
         30 . The method according to  claim 12 , wherein said method further comprises dilution with at least one organic solvent. 
     
     
         31 . The method according to  claim 30 , wherein said organic solvent is propanol, butanol, pentanol, hexanol and/or octanol. 
     
     
         32 . The method according to  claim 31 , wherein said method further comprises addition of at least one pigment, filler, levelling additive, flow additive and/or antifoaming. 
     
     
         33 . The method according to  claim 32 , wherein said method yields a decorative and/or protective coating.