摘要 |
The invention relates to hardeners for water-based epoxy resin systems providing a longer resin pot life, incorporating particular carbonyl compounds (F) and being obtainable by (i) reacting a mixture of (A) at least one epoxidized polyalkylene oxide (A), (B) at least one epoxidized aromatic hydroxy compound (B); (C) at least one aromatic hydroxy compound (C); and (D) optionally, at least one di- or tri-glycidyl ether compound (D), to form a first intermediate product (Z1) having an epoxy value of less than 10%; (ii) reacting the intermediate product (Z1) with a polyamine (E) to form a second intermediate product (Z2); and (iii) reacting the intermediate product (Z2) with a carbonyl compound (F) having the general formula (I): wherein R<SUP>1 </SUP>and R<SUP>2 </SUP>independently represent hydrogen, a C<SUB>1-22 </SUB>alkyl group or a C<SUB>6</SUB>H<SUB>5</SUB>, OH, OR<SUP>3 </SUP>group, where R<SUP>3 </SUP>is a C<SUB>1-22 </SUB>alkyl group; among others. The resin mixtures provide clear floor coatings.
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