Basf Coatings Ag

Walburga Kathmann

Hardy Reuter

Silke Przybilla

Dagmar Schemschat

Walter Jouck

Oliver Johannpoetter

Adam Stals

Ingeborg Grempels

Bing Hsieh

An agent for the single-stage full blocking of polyisocyanates comprises or consists of an alcohol mixture A) comprising a) furfuryl alcohol or substituted furfuryl alcohols in an amount corresponding to from 60 to 90, in particular from 65 to 85, mol % of hydroxyl groups and b) at least one monoalcohol in an amount corresponding to at least 2 mol % of hydroxyl groups, based in each case on the total amount of hydroxyl groups in components a) and b). In addition, the alcohol mixture A) may also include at least one aliphatic polyol c) of low molecular mass with a functionality of three and/or more in an amount corresponding to at least 5 mol % of hydroxyl groups, based on the total amount of hydroxyl groups in components a), b) and c). In this case component b) can have a molecular weight of <163 g/mol. In a single stage, the blocking agent yields fully blocked polyisocyanates having a low crystallization tendency that are suitable as crosslinking agents in coating compositions, especially in cathodically depositable electrodeposition coating materials.

Agent for blocking polyisocyanates, polyisocyanates blocked therewith, and coating compositions comprising these blocked polyisocyanates

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Münster, Germany

Walburga Kathmann