Use of compounds having n 2-oxo-1,3-dioxolane-4-carboxamide units in two-component adhesives

A two-component adhesive, comprising

• at least one compound having n 2-oxo-1,3-dioxolane-4-carboxamide units as a reactive, first component;
• wherein the compound having n 2-oxo-1,3-dioxolane-4-carboxamide units is represented by formula (I)
• where
• R1 and R3 independently of one another are H or an organic radical;
• and
• R2 is an n-valent organic radical which is substituted by n−1 further 2-oxo-1,3-dioxolane-4-carboxamide groups,
• and
• at least one curing agent compound selected from the group consisting of a polyamine having two or more amine groups and a polyol having two or more alcoholic hydroxyl groups as a second component;
• wherein n is a number greater than 2,
• where either the compound having n 2-oxo-1,3-dioxolane-4-carboxamide units or the curing agent compound or both comprises at least one linear or branched flexible spacer group, where the flexible spacer group has a molecular weight of at least 200 g/mol;
• wherein the 2-oxo-1,3-dioxolane-4-carboxamide is a compound of formula (VII)
• where
• is an alkoxylated glycerol radical having 2 to 5 C atoms in the alkoxy group,
• wherein the two-component adhesive has a bond strength of greater than 1.5 N/15 mm, measured as the peel strength of two polyester films bonded to one another with a 3 μm layer of adhesive and with an applied pressure of 3 bar after 24 hours.

A method for bonding two substrates to one another, the method comprising:

• applying a two-component adhesive to a surface of at least one of the substrates,
• wherein the method for bonding is a laminating method producing laminated articles selected from high-gloss films, composite films, and laminated moldings, where
• a) a first substrate is provided in the form of a first film,
• b) a second substrate is provided, selected from paper, a second film, which may be identical to or different from the first film, and moldings,
• c) the two-component adhesive is applied to the first substrate and/or to the second substrate, and is optionally allowed to dry, and the first substrate is laminated onto the second substrate, wherein the lamination may optionally take place with thermal activation;
• wherein the two component adhesive comprises at least one compound having n 2-oxo-1,3-dioxolane-4-carboxamide units as a reactive component, wherein the compound having n 2-oxo-1,3-dioxolane-4-carboxamide units is represented by formula (I)
• where
• R1 and R3 independently of one another are H or an organic radical;
• and
• R2 is an n-valent organic radical which is substituted by n−1 further 2-oxo-1,3-dioxolane-4-carboxamide groups,
• and n is a number greater than 2,
• wherein the 2-component lamination adhesive has a bond strength of greater than 1.5 N/15 mm, measured as the peel strength of two polyester films bonded to one another with a 3 μm layer of adhesive and with an applied pressure of 3 bar after 24 hours;
• wherein a polyfunctional curing agent compound is used as a second component of the two-component adhesive and is selected from polyamines which have two or more amine groups and polyols which have two or more alcoholic hydroxyl groups;
• wherein either the compound having n 2-oxo-1,3-dioxolane-4-carboxamide units or the curing agent compound or both comprise at least one linear or branched flexible spacer group, where the flexible spacer group has a molecular weight of at least 200 g/mol;
• wherein the 2-oxo-1,3-dioxolane-4-carboxamide is a compound of formula (VII)
• where
• is an alkoxylated glycerol radical having 2 to 5 C atoms in the alkoxy group.

A 2-oxo-1,3-dioxolane-4-carboxamide of formula (1)

• where
• R1 and R3 independently of one another are H or an organic radical;
• and
• R2 is an n-valent organic radical which is substituted by n−1 further 2-oxo-1,3-dioxolane-4-carboxamide groups,
• n is a number greater than 2, and
• where between the 2-oxo-1,3-dioxolane-4-carboxamide groups there is at least one linear or branched spacer group having a molecular weight of at least 200 g/mol, wherein the 2-oxo-1,3-dioxolane-4-carboxamide is a compound of formula (VII)
• where
• is an alkoxylated glycerol radical having 2 to 5 C atoms in the alkoxy group.