Acrylic polyol coating composition

Abstract

This invention is directed to a coating composition comprising an coating composition comprising a crosslinkable composition and a crosslinking composition. The crosslinkable composition comprises an acrylic polyol wherein the acrylic polyol comprises at least 40 percent by weight of at least one linear or branched C8 or higher alkyl acrylate monomer and at least one polyester extended acrylate monomer. The coating composition is suitable for use as a basecoat and can be used in a 3-wet paint process that eliminates the primer curing booth.

1 . A coating composition comprising a crosslinkable component and a crosslinking component wherein;
 (a) the crosslinkable component comprises an acrylic polyol wherein the acrylic polyol comprises at least one linear or branched C8 or higher alkyl acrylate monomer, and at least one polyester-extended acrylate monomer, and   (b) the crosslinking component comprises at least one of the group selected from melamine, aminoplast resin, polyisocyanate, blocked polyisocyanate, or a combination thereof; and   wherein the total weight percentage of the linear or branched C8 or higher alkyl acrylate monomers and polyester-extended acrylate monomers is at least 40.   
     
     
         2 . The coating composition of  claim 1  wherein said acrylic polyol comprises at least one C8 or higher alkyl acrylate monomer in an amount of from 10 percent to 60 percent by weight of the acrylic polyol. 
     
     
         3 . The coating composition of  claim 1  wherein said at least one linear or branched C 8  or higher acrylate monomer is selected from the group consisting of octyl acrylate, octyl methacrylate, nonyl acrylate, nonyl methacrylate, decyl acrylate, decyl methacrylate, undecyl acrylate, undecyl methacrylate, dodecyl acrylate, dodecyl methacrylate, isodecyl acrylate, isodecyl methacrylate, isotridecyl acrylate, isotridecyl methacrylate, tridecyl acrylate, tridecyl methacrylate, tridecyl acrylate, tridecyl methacrylate, stearyl acrylate, and stearyl methacrylate, lauryl acrylate, lauryl methacrylate, or a combination thereof. 
     
     
         4 . The coating composition of  claim 1  wherein the crosslinking component comprises a melamine. 
     
     
         5 . The coating composition of  claim 1  wherein the acrylic polyol further comprises at least one monomer selected from the group of styrene, alpha-methyl styrene, C 1  to C 10  (cyclo)alkyl acrylate, acrylic acid, methacrylic acid, maleic acid, fumaric acid, or a combination thereof. 
     
     
         6 . The coating composition of  claim 1  wherein said at least one polyester extended acrylate monomer is the product of a reaction between a hydroxy alkyl acrylate and caprolactone. 
     
     
         7 . The coating composition of  claim 1  wherein said coating composition is a basecoat or a glossy topcoat. 
     
     
         8 . An article coated by the coating composition of  claim 1 . 
     
     
         9 . A process for forming a multi-layer coating comprising sequentially applying a layer of a primer composition, a layer of a basecoat composition and a layer of a clearcoat composition on a substrate; and simultaneously curing the applied layers by heating;
 wherein the basecoat composition comprises a crosslinkable component, a crosslinking component, an organic liquid carrier, and optionally pigment; wherein
 a) the crosslinkable component comprises an acrylic polyol wherein the acrylic polyol comprises at least one linear or branched C8 or higher alkyl acrylate monomer, and at least one polyester-extended acrylate monomer, and 
 b) the crosslinkable component comprises at least one of the group selected from melamine, aminoplast resin, amino resin, polyisocyanate, blocked polyisocyanate, or a combination thereof; and 
 wherein the total weight percentage of the linear or branched C8 or higher alkyl acrylate monomer and polyester-extended acrylate monomer is at least 40. 
   
     
     
         10 . The process of  claim 9  wherein the process further comprises a flash step between the application of the layer of basecoat composition and the layer of clearcoat composition. 
     
     
         11 . The process of  claim 10  wherein the process further comprises a flash step between the application of the layer of primer composition and the layer of basecoat composition. 
     
     
         12 . The process of  claim 9  wherein said curing is the first curing for each of the applied primer, basecoat, and clearcoat layers. 
     
     
         13 . The process of  claim 9  wherein said at least one linear or branched C8 or higher alkyl acrylate monomer comprises in the range of from 10 percent to 60 percent by weight of the acrylic polyol. 
     
     
         14 . The process of  claim 9  wherein said at least one linear or branched C 8  or higher acrylate monomer is chosen from the group consisting of octyl acrylate, octyl methacrylate, nonyl acrylate, nonyl methacrylate, decyl acrylate, decyl methacrylate, undecyl acrylate, undecyl methacrylate, dodecyl acrylate, dodecyl methacrylate, isodecyl acrylate, isodecyl methacrylate, isotridecyl acrylate, isotridecyl methacrylate, tridecyl acrylate, tridecyl methacrylate, tridecyl acrylate, tridecyl methacrylate, stearyl acrylate, and stearyl methacrylate, lauryl acrylate, lauryl methacrylate, or a combination thereof. 
     
     
         15 . The process of  claim 9  wherein the crosslinkable component comprises a melamine. 
     
     
         16 . The process of  claim 9  wherein said at least one polyester extended acrylate monomer is the product of the reaction between a hydroxy alkyl acrylate and caprolactone.