Abstract: Gel-time drift may be reduced in promoted polyester resin systems by incorporation of an amine salt in accordance with the disclosed compositions and methods. The amine salt is a salt-like reaction product of an amine and a carboxylic acid-containing moiety. For free-amine type promoted resin systems, an amine salt may be substituted for the amine promotor to provide a low-energy curable polyester resin system having the advantages of a promoted system as well as being stabilized against gel-time drift. Comparative data show suppression of gel-time drift of resin samples containing an amine salt to as low as 7 percent of gel-time drift of counterpart free-amine promoted resin system samples.

Abstract: A method is disclosed for treating polyester resin systems to suppress gel-time drift for the useable storage life of the resin system. The method comprises contacting a solution containing a polyester binder with an organic acid either between formulation stages or after formulation of the resin system. Typically useful organic acids include aromatic dicarboxylic acids such as phthalic acid and unsaturated aliphatic dicarboxylic acids such as fumaric acid. Comparative data for gel times of polyester resin system samples treated according to the disclosed method show suppression of gel-time drift to as low as 6 percent of the gel-time drift of counterpart untreated resin system samples.

Abstract: Gel-time drift may be reduced in promoted polyester resin systems by incorporation of an amine salt in accordance with the disclosed compositions and methods. The amine salt is a salt-like reaction product of an amine and a carboxylic acid-containing moiety. For free-amine type promoted resin systems, an amine salt may be substituted for the amine promotor to provide a low-energy curable polyester resin system having the advantages of a promoted system as well as being stabilized against gel-time drift. Comparative data show suppression of gel-time drift of resin samples containing an amine salt to as low as 7 percent of gel-time drift of counterpart free-amine promoted resin system samples.