Improved polyurea coatings from mixtures of polyaspartic esters dimethyl substituted.

摘要

A process for preparing a polyaspartic ester mixture comprising the sequential steps of: (a) forming an ester component including (i) a first ester component selected from the group consisting of esters of maleic dimethyl-substituted esters of fumaric acid dimethyl-substituted, and (ii) a second ester component selected from the group consisting of esters of esters of maleic acid esters substituted with alkyl groups having at least two carbon atoms and esters of esters of fumaric acid substituted alkyl groups having at least two carbon atoms; and (b) reacting the ester component with a component of propylene oxide amine that includes an amine selected from the group consisting of propylene oxide difunctional amines and propylene oxide trifunctional amines; wherein the first ester component and the second ester component are used in amounts which are sufficient to prevent a laformación stopping crude mixture containing the reaction of dimethyl fumarate crystals.