| 摘要 |
<p>Powder coating compositions, comprising: (i) an advanced resin product, obtainable by reacting (a) a diglycidyl ether of a bisphenol of formula (I) wherein the R1 symbols may be the same or different and each R1 represents hydrogen or lower alkyl, having from 1 to 4 C atoms, and wherein n has a value in the range of from 1.0 to 2, said diglycidyl ether having an epoxide content in the range of from 5500 to 2000 mmol/kg and a hydroxyl content in the range of from 250 to 2500, which (b) an alpha-alpha'-di-branched dicarboxylic acid of the formula (II) wherein the R2 symbols may be the same or different and each R2 represents a lower alkyl having from 1 to 3 carbon atoms, and preferably 1 or 2 carbon atoms, and wherein m is an integer in the range of from 0 to 8, the advanced resin having a number average molecular weight in the range of from 500 to 7000; and (ii) a curing compound selected from the group consisting of amino resins, blocked or unblocked (cyclo)aliphatic isocyanates alpha,alpha'-dibranced cyclic anhydrides, acid functional linear polyesters (cyclo)aliphatic polyamine amides; advanced resin product (i) itself, and cured coating compositions on a substrate.</p> |
