Patent ID: 6458293
Filing Date: 2002-10-01
Classification: C07C,C08G,C09D

Abstract:
A method for making a polyaspartic ester mixture which comprises reactinga) a mixture of i) a first ester component comprising a member selected from the group consisting of dimethyl maleate and methyl fumarate and ii) a second ester component comprising a member selected from the group consisting of esters of maleic acid substituted with alkyl groups having at least two carbon atoms and esters of fumaric esters substituted with alkyl groups having at least two carbon atoms, with (b) an amine component comprising a member selected from the group consisting of difunctional, trifunctional and tetrafunctional amines, wherein component ii) is present in an amount sufficient to prevent the formation of a reaction-stopping crude mixture containing dimethyl fumarate crystals and the reaction carried in the absence of an organic solvent or in the presence of less than 5% of an organic solvent, based on the total weight of the solution.