Polyaspartic acid ester compositions which contain polyaspartic acid esters with primary amino groups and small amounts of fumaric acid dialkyl esters

A polyaspartic ester composition comprising one or more polyaspartic esters of the general formula (I)

• in which
• X is an m-valent organic radical, optionally containing one or more heteroatoms obtained by removing the primary amino groups from a corresponding polyamine that has (cyclo)aliphatically or araliphatically attached amino groups and is in the molecular weight range from 60 to 6000 g/mol, and which comprises further functional groups that are reactive toward isocyanate groups and/or inert at temperatures of up to 100° C.,
• R1 and R2 are identical or different organic radicals each having 1 to 18 carbon atoms,
• m is an integer >1,
• and
• one or more polyaspartic esters having a primary amino group that are of the general formula (II)
• in which
• n is m−1,
• X and radicals R1 and R2 have the meanings defined for the polyaspartic esters of the general formula (I),
• wherein a proportion of the polyaspartic esters of the general formula (II) corresponds to from 4% to 15% of a total GC surface area of the composition measured by gas chromatogram as area-%, wherein the total GC surface area is a sum of the individual surface areas of the polyaspartic esters of the general formulas (I) and (II) and is equal to 100%, and wherein the composition comprises dialkyl fumarate in a proportion of 0.01 to 1% by weight.