Binder for an aqueous coating composition
AssigneeAllnex Austria GmbH
InventorsArmin Temel, Florian Lunzer, Robert Potzmann, Richard Hendrikus Gerrit Brinkhuis
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Abstract
The invention relates to a self-emulsifying polymer US comprises Michael donor groups, wherein the Michael donor groups are acidic C—H groups from activated methylene and/or methine groups, to an aqueous polymer dispersion containing a mixture thereof with compounds having Michael acceptor groups which are activated olefinically unsaturated groups, activated by an electron-withdrawing group, and a catalyst to promote the Michael reaction, to a paint binder prepared from the mixture and the catalyst, and to coating compositions comprising the paint binder and appropriate additives.
Claims26
A water dispersible self-emulsifying polymer US comprising Michael donor groups,
- wherein the polymer chain of the polymer US comprises at least one selected from the group consisting of ester groups and urethane groups as parts of the repeating units,
- wherein the polymer US has as further constituents in the polymer chain, incorporated moieties that have pending hydrophilic groups and/or hydrophilic groups that are other than the at least one selected from the group consisting of ester groups and urethane groups as parts of the repeating units, and that are structural elements of a hydroxy-functional component A having at least one hydrophilic moiety that is nonionic when derived from a compound An, or anionic when derived from a compound Aa, or has both anionic and nonionic substructures when derived from a compound Aan,
- wherein the compound Aa has at least one hydroxyl group and an acid group,
- wherein the compound An is:
- a component An1 which is a monoalkylether of a polyoxyalkylene glycol having from one to four carbon atoms in the alkyl group, and from two to four carbon atoms in the alkylene group which is linear or branched, and where the polyoxyalkylene group is bound with the remaining hydroxyl group by an ether bond to a dihydric alcohol, to yield a monohydroxy-functional component An11, or to an at least trihydric alcohol to yield a dihydroxy-functional, or higher functional component An12, and/or
- a polyoxyalkylene glycol An2 having two hydroxyl groups, wherein the alkylene group is linear or branched and has from two to four carbon atoms in the alkylene group,
- wherein the compound Aan is a mixture of the compound Aa and the compound An,
- wherein the polymer US has a number average molar mass of at least 500 g/mol,
- wherein the Michael donor groups are acidic C—H groups from activated methylene and/or methine groups, the carbon atom of the acidic C—H group being attached to at least one electronegative substituent,
- wherein the polymer US, comprises, on average, at least two acidic C—H groups per molecule,
- wherein the specific amount of acidic C—H groups in the polymer US is at least 0.5 mol/kg, and
- wherein the amount of acidic C—H groups in the polymer US is derived in majority from malonate moieties.
Dependencies are inferred from the claim text.