Curable compositions containing functional polyesters and aldimines

Abstract

The invention provides a curable composition comprising at least one polyester polymer A having ketone ester groups of formula (I) and having an average functionality of at least 2 and an average equivalent weight of at least 400 g / eq, at least one compound B having ketone ester groups of formula (I) and having an equivalent weight of 114 to 250 g / eq, wherein R is a monovalent hydrocarbon group having 1 to 10 carbon atoms, and at least one aldimine L having aldimine groups of formula (II) and an aldimine equivalent weight of 110 to 350 g / eq, wherein Z is an aromatic or heteroaromatic five- or six-membered ring, which is optionally substituted and / or fused and comprises a total of 4 to 25 carbon atoms, wherein the weight ratio between compound B and polyester polymer A is 25 / 75 to 85 / 15, and wherein the ratio between the number of ketone ester groups of formula (I) and the number of aldimine groups of formula (II) is 2 to 3. The composition contains no toxic ingredients, is not moisture sensitive, and cures under ambient conditions without emissions and interfering odors, resulting in a viscoelastic polymer with high hardness, high tear propagation resistance, and good ductility. The composition is especially suitable as a viscoelastic adhesive, sealant, or coating.

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