Aqueous, curable composition, comprising dispersed uretdione prepolymer, reactant and azolate

2:

• The aqueous, curable composition according to claim 1, characterized in that in a first step, the at least one uretdione polyisocyanate A1 is reacted, preferably in the presence of a catalyst, with the at least one compound A2 wherein after the first step the resulting intermediate product has preferably an isocyanate content of 0.5 to 10 wt.-%, preferably 1 to 6 wt.-%, more preferably 2 to 4 wt.-%, measured according to DIN EN ISO 11909:2007-05;
• and in a second step the polymer obtained in the first step is reacted with the at least one reactant A3.

3:

• The aqueous, curable composition according to claim 1, characterized in that the components A1 to A3 are reacted in a one-step process, preferably in the presence of a catalyst.

4:

• The aqueous, curable composition according to claim 1, characterized in that in a first step, the at least one uretdione polyisocyanate A1 is reacted with the at least one reactant A3 and in a second step the polymer obtained in the first step is reacted in a second step with the at least one compound A2, preferably in the presence of a catalyst.

5:

• The aqueous, curable composition according to claim 1, characterized in that said uretdione prepolymer is a nonionic prepolymer.

6:

• The aqueous, curable composition according to claim 1, characterized in that said uretdione prepolymer exhibits a zeta potential of at least −20 mV.

7:

• The aqueous, curable composition according to claim 1, characterized in that said uretdione prepolymer A comprises at least one *—O—(CH2CH2O)n—R moiety, in which R is a hydrogen atom or a (C1-C4)-alkyl group and n is a number from 3 to 100.

8:

• The aqueous, curable composition according to claim 1, characterized in that said uretdione polyisocyanate A1 is obtained from at least one cycloaliphatic polyisocyanate.

9:

• The aqueous, curable composition according to claim 1, characterized in that said uretdione polyisocyanate A1 is obtained from isophorone diisocyanate (IPDI), 1,6-hexylene diisocyanate or mixtures thereof.

10:

• The aqueous, curable composition according to claim 1, characterized in that said uretdione polyisocyanate A1 is prepared from at least 20 mol % isophorone diisocyanate (IPDI) based on the total amount of polyisocyanates used.

11:

• The aqueous, curable composition according to claim 1, characterized in that said uretdione polyisocyanate A1 is prepared from isophorone diisocyanate as the only polyisocyanate used.

12:

• The aqueous, curable composition according to claim 1, characterized in that the uretdione polyisocyanate A1 contains from 1 to 10 uretdione moieties.

14:

• The aqueous, curable composition according to claim 1, characterized in that compound A3 is selected from at least one polyol which is different from A2, preferably selected from polyester polyols, polyether polyols, polyurethane polyols, polyacrylate polyols, polymethacrylate polyols, polycarbonate polyols or mixtures thereof, preferably A3 is selected from polyester polyols, polyether polyols, polycarbonate polyols, polyurethane polyols, polyacrylate polyols, polymethacrylate polyols, C2-C10-hydrocarbons with at least two hydroxyl groups, or mixtures thereof, most preferably A3 is a polyester polyol.

15:

• The aqueous, curable composition according to claim 1, characterized in that said compound A1 is used in an amount of 3.0 to 50.0 wt. % based on the total weight of compounds A1 to A3.

16:

• The aqueous, curable composition according to claim 1, characterized in that said compound A2 is used in amount of 50 to 97 wt.-% based on the total weight of compounds A1 to A3.

17:

• The aqueous, curable composition according to claim 1, characterized in that the weight ratio of A1 to A2 is from 1:1 to 1:32.3.

18:

• The aqueous, curable composition according to claim 1, characterized in that said uretdione prepolymer is a dispersed uretdione prepolymer, preferably characterized in that the uretdione prepolymer is suspended in the aqueous liquid.

19:

• The aqueous, curable composition according to claim 1, characterized in that said uretdione prepolymer A is contained in a total amount of 3 to 40 wt. % based on the total weight of the composition.

21:

• The aqueous, curable composition according to claim 20, characterized in that said azolate-compound C is selected from alkaline metal-1,2,4-triazolate, alkaline metal-1,2,3-triazolate, alkaline metal-benzotriazolate, alkaline earth metal-1,2,4-triazolate, alkaline earth metal-1,2,3-triazolate, alkaline earth metal-benzotriazolate.

22:

• The aqueous, curable composition according to claim 1, characterized in that said at least one compound B, which comprises at least one Zerewitinoff-active group is selected from polyester polyols, polyether polyols, polyurethane polyols, polyacrylate polyols, polymethacrylate polyols, or polycarbonate polyols and mixtures thereof.

23:

• The aqueous, curable composition according to claim 1, characterized in that said uretdione prepolymer A is contained in an amount of 1 to 50 wt. % and
• said at least one compound B, which comprises at least one Zerewitinoff-active group is contained in an amount of 0 to 80 wt.-% and
• said triazolate-compound C is contained in an amount of 0.1 to 10 wt. %, based on the total weight of the composition, respectively.

24:

• The aqueous, curable composition according to claim 1, characterized in that the composition comprises water in an amount of 10 to 85 wt. %, based on the total weight of the composition.

25:

• The aqueous, curable composition according to claim 1, characterized in that the pH-value at 20° C. is from pH 5 to pH 13.

27:

• Process according to claim 26, wherein the deposited aqueous, curable composition is exposed to a temperature of 60° C. to 120° C. to cure said deposited curing composition.

28:

• Process according to claim 26, wherein the deposited curable composition is exposed to said temperature for a period of 25 to 40 minutes to cure said deposited curing composition.

29:

• Process according to claim 26, wherein the deposited aqueous curable composition coalesces to form a coating.

30:

• Process according to claim 26, wherein the cured aqueous curable composition forms a solid on the substrate.

31:

• A cured article obtainable by the process according to claim 26.

32:

• Use of the composition according to claim 1 for coatings, adhesives and/or sealants.