Adhesion promoting compositions and method of improving fuel resistance of a coated article

Abstract

The present invention is directed to solventborne film-forming compositions comprising: a) a non-chlorinated, linear polyolefin polymer prepared from a reaction mixture comprising 0.5 to 5 percent by weight maleic anhydride based on the total weight of monomers in the reaction mixture; b) an aminoplast: and c) a polymer component comprising: i) an addition polymer prepared from a reaction mixture comprising coumarone; and/or ii) an alkyd resin. The present invention is also drawn to methods of improving fuel resistance of a coated article, comprising: (1) applying the solventborne film-forming composition above to a substrate to form a coated substrate; (2) applying a curable film-forming composition to at least a portion of the coated substrate formed in step (1) to form a multi-layer coated substrate; and (3) heating the multi-layer coated substrate formed in step (2) to a temperature and for a time sufficient to cure the film-forming composition.

Therefore, we claim: 
     
         1 . A solventborne film-forming composition comprising:
 a) a non-chlorinated, linear polyolefin polymer prepared from a reaction mixture comprising 0.5 to 5 percent by weight maleic anhydride based on the total weight of monomers in the reaction mixture;   b) an aminoplast: and   c) a polymer component comprising:
 i) an addition polymer prepared from a reaction mixture comprising coumarone; and/or 
 ii) an alkyd resin. 
   
     
     
         2 . The composition of  claim 1  wherein the linear polyolefin polymer a) is dispersed in an organic medium with a polyepoxide and a monohydric alcohol. 
     
     
         3 . The composition of  claim 2  wherein the monohydric alcohol comprises n-propanol, isopropanol, n-butanol, and/or isobutanol. 
     
     
         4 . The composition of  claim 1  wherein the linear polyolefin polymer a) is further reacted with a polyepoxide and a monohydric alcohol. 
     
     
         5 . The composition of  claim 4  wherein the monohydric alcohol comprises n-propanol, isopropanol, n-butanol, and/or isobutanol. 
     
     
         6 . The composition of  claim 1  wherein the reaction mixture used to prepare the linear polyolefin polymer a) further comprises an ethylenically unsaturated monomer comprising at least one (meth)acrylic monomer. 
     
     
         7 . The composition of  claim 1  wherein the aminoplast is at least partially alkylated and wherein 10 to 35 percent of functional groups on the aminoplast comprise imino groups. 
     
     
         8 . The composition of  claim 1  wherein the polymer component c) comprises an addition polymer prepared from a reaction mixture comprising coumarone, indene, and styrene. 
     
     
         9 . The composition of  claim 1  wherein the polymer component c) comprises i) an addition polymer prepared from a reaction mixture comprising coumarone, indene, and styrene; and ii) an alkyd resin. 
     
     
         10 . The composition of  claim 1 , further comprising a colorant. 
     
     
         11 . The composition of  claim 1 , further comprising a hydroxyl functional (meth)acrylic polymer and/or a hydroxyl functional polyester polymer. 
     
     
         12 . A method of improving fuel resistance of a coated article, comprising:
 (1) applying a first film-forming composition to at least a portion of a substrate to form a coated substrate, wherein the first film-forming composition is solventborne and comprises:   a) a non-chlorinated, linear polyolefin polymer prepared from a reaction mixture comprising 0.5 to 5 percent by weight maleic anhydride based on the total weight of monomers in the reaction mixture;   b) an aminoplast: and   c) a polymer component comprising:
 i) an addition polymer prepared from a reaction mixture comprising coumarone; and/or 
 ii) an alkyd resin; 
   (2) applying a second, curable film-forming composition to at least a portion of the coated substrate formed in step (1) to form a multi-layer coated substrate; and   (3) heating the multi-layer coated substrate formed in step (2) to a temperature and for a time sufficient to cure the second, curable film-forming composition; wherein the substrate comprises an elastomeric, plastic, or composite material.   
     
     
         13 . The method of  claim 12  wherein the linear polyolefin polymer a) is dispersed in an organic medium with a polyepoxide and a monohydric alcohol. 
     
     
         14 . The method of  claim 13  wherein the monohydric alcohol comprises n-propanol, isopropanol, n-butanol, and/or isobutanol. 
     
     
         15 . The method of  claim 12  wherein the linear polyolefin polymer a) is further reacted with a polyepoxide and a monohydric alcohol. 
     
     
         16 . The method of  claim 15  wherein the monohydric alcohol comprises n-propanol, isopropanol, n-butanol, and/or isobutanol. 
     
     
         17 . The method of  claim 12  wherein the reaction mixture used to prepare the linear polyolefin polymer a) further comprises an ethylenically unsaturated monomer comprising at least one (meth)acrylic monomer. 
     
     
         18 . The method of  claim 12  wherein the aminoplast is at least partially alkylated and wherein 10 to 35 percent of functional groups on the aminoplast comprise imino groups. 
     
     
         19 . The method of  claim 12  wherein the polymer component c) comprises an addition polymer prepared from a reaction mixture comprising coumarone, indene, and styrene. 
     
     
         20 . The method of  claim 12  wherein the polymer component c) comprises i) an addition polymer prepared from a reaction mixture comprising coumarone, indene, and styrene; and ii) an alkyd resin. 
     
     
         21 . The method of  claim 12 , wherein the first film-forming composition further comprises a colorant. 
     
     
         22 . The method of  claim 12 , wherein the first film-forming composition further comprises a hydroxyl functional (meth)acrylic polymer and/or a hydroxyl functional polyester polymer. 
     
     
         23 . The method of  claim 12  wherein the multi-layer coated substrate is heated to a temperature up to 135° C. in step (3).