Silicone-modified polyester coating

Abstract

A silicone-modified polyester resin and methods for making the resin are described herein. The method includes production of a siliconized intermediate which is then esterified to give a silicone-modified polyester resin. Coating compositions including the silicone-modified polyester resin are provided, and coated articles with the coating composition applied to at least a portion of a surface thereof are also provided.

What is claimed is: 
     
         1 - 20 . (canceled) 
     
     
         21 . A coated article, comprising 
 a planar metal substrate;   a cured coating applied on the planar metal substrate by a coil coating process; said coating derived from a liquid silicone-modified polyester coating composition made by a method comprising
 providing at least one hydroxy-functional silicone compound; 
 providing at least one hydroxy-functional compound; 
 combining the hydroxy-functional silicone compound and the hydroxy-functional compound to produce a siliconized hydroxy-functional polymer; 
 esterifying the siliconized hydroxy-functional polymer with at least one carboxylic acid-functional compound or derivative thereof to form the siliconized polyester; and 
 curing the coating composition on the substrate to form the coated article, 
 
 wherein the coated article demonstrates optimal weathering performance. 
     
     
         22 . The coated article of  claim 21 , wherein the coated article has optimal adhesion, hardness, flexibility, and abrasion resistance. 
     
     
         23 . The coated article of  claim 21 , wherein the step of coating the curing composition applied to the planar metal substrate comprises heating the coated substrate to a peak metal temperature of 200 to 250° C. for about 8 to 25 seconds. 
     
     
         24 . The coated article of  claim 21 , wherein the planar metal substrate comprises hot-rolled steel, cold-rolled steel, hot-dip galvanized, electro-galvanized, aluminum, tin plate, aluminum-coated zinc alloy sheet, or combinations thereof. 
     
     
         25 . The coated article of  claim 21 , wherein the article is an exterior building material or architectural skin.