Covestro (Netherlands) B.v.

Jan Van Riel

Gerardus Cornelis Overbeek

Alfred Jean Paul Bückmann

Patrick Johannes Maria Stals

Daan Van Der Zwaag

Stella Josette Van Dijk

Hermanus Adrianus Langermans

Kristel De Vos Verschuren

Rob Looijmans

Kristel De Vos-Verschuren

The present invention relates to a multi-aziridine crosslinker composition, characterized in that the multi-aziridine crosslinker composition is an aqueous dispersion having a pH ranging from 8 to 14 and comprises a multi-aziridine compound in dispersed form, wherein said multi-aziridine compound has: a. from 2 to 6 of the following structural units A: whereby Ris H, Rand Rare independently chosen from H or an aliphatic hydrocarbon group containing from 1 to 4 carbon atoms, R a is an aliphatic hydrocarbon group containing from 1 to 4 carbon atoms, m is 1, b. one or more linking chains wherein each one of these linking chains links two of the structural units A; and c. a molecular weight in the range from 500 to 10000 Daltons wherein the molecular weight is determined using MALDI-TOF mass spectrometry according to the description.

Waterborne crosslinker composition

The present invention relates to a multi-aziridine compound having: a) from 2 to 6 of the following structural units (A): whereby R′, R″ are as defined herein m is an integer from 1 to 6; b) one or more linking chains wherein each one of these linking chains links two of the structural units A; and c) a molecular weight in the range from 840 Daltons to 5000 Daltons. The multi-aziridine compound can be used for example for crosslinking of for example carboxylic acid functional polymers dissolved and/or dispersed in an aqueous medium.

Multi-aziridine compound

The present invention relates to a multi-aziridine crosslinker composition, including an aqueous dispersion having a pH ranging from 9 to 14 and including a multi-aziridine compound in dispersed form. The multi-aziridine compound has: a. from 2 to 6 of the following structural units A: (A) whereby R1, R2, R3 and R4 are H; m is 1, R′ and R″ are according to (1) or (2): (2) R′=H or an aliphatic hydrocarbon group containing from 1 to 14 carbon atoms, and R″=an alkyl group containing from 1 to 4 carbon atoms, CH2-O—(C═O)—R′″ or CH2-O—R″″, whereby R′″ is an alkyl group containing from 4 to 12 carbon atoms and R″″ is an alkyl group containing from 1 to 14 carbon atoms, (2) R′ and R″ form together a saturated cycloaliphatic hydrocarbon group containing from 5 to 8 carbon atoms.

The present invention relates to a multi-aziridine compound having: ⋅a) from 2 to 6 of the following structural units (A): whereby Ris H, Rand Rare independently chosen from H or an aliphatic hydrocarbon group containing from 1-4 carbon atoms, Ris an aliphatic hydrocarbon group containing from 1-4 carbon atoms, R'═H or an aliphatic hydrocarbon group containing from 1 to 4 carbon atoms; R″ and R′″ are independently chosen from an aliphatic hydrocarbon group containing from 1 to 4 carbon atoms, a cycloaliphatic hydrocarbon group containing from 4 to 12 carbon atoms or an aromatic hydrocarbon group containing from 6 to 12 carbon atoms, b) one or more linking chains wherein each one of these linking chains links two of the structural units A; and c) a molecular weight in the range from 600 Daltons to 5000 Daltons.

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Geleen, Netherlands

Jan Van Riel