CURABLE POLYURETHANE DISPERSIONS
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Abstract
The present invention relates to an aqueous polyurethane or polyurethane-urea dispersion comprising a polyurethane or a polyurethane polyurea dispersed therein, wherein the polyurethane or polyurethane polyurea comprises terminal carboxyl groups and lateral sulfonate and/or carboxylate groups.
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Citations
30 Claims
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1-15. -15. (canceled)
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16. An aqueous polyurethane or polyurethane-urea dispersion comprising a polyurethane or a polyurethane polyurea dispersed therein, wherein the polyurethane or polyurethane polyurea comprises terminal carboxyl groups and lateral sulfonate and/or carboxylate groups.
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17. The aqueous polyurethane or polyurethane-urea dispersion according to claim 16, wherein the polyurethane or polyurethane polyurea comprises terminal carboxyl groups and sulfonate groups, wherein at least 70 mol % of the sulfonate groups are lateral.
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18. The aqueous polyurethane or polyurethane-urea dispersion according to claim 16, wherein the polyurethane or polyurethane polyurea comprises terminal carboxyl groups and carboxylate groups, wherein at least 50% of the carboxylate groups are lateral.
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19. The aqueous polyurethane or polyurethane-urea dispersion according to claim 16, wherein the polyurethane or polyurethane polyurea comprises terminal carboxyl groups, carboxylate groups, and sulfonate groups, wherein at least 50% of the carboxylate groups and sulfonate groups are lateral,
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20. The aqueous polyurethane or polyurethane-urea dispersion according to claim 16, wherein the polyurethane or polyurethane polyurea is obtained by reacting components consisting of
a) at least one component comprising sulfonate and/or carboxylate groups, and comprising two or three isocyanate-reactive hydroxyl and/or amino groups, b) at least one diol and/or polyol component, c) at least one di- and/or polyisocyanate component, d) at least one aminocarboxylic acid and/or hydroxycarboxylic acid, comprising only one hydroxyl or amino group, e) optionally mono-, di- and/or triamino- and/or hydroxy-functional compounds and f) optionally other isocyanate-reactive compounds.
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21. The aqueous polyurethane or polyurethane-urea dispersion according to claim 20, wherein component a) is used in an amount of from 0.5 to 10 wt. %, component b) in an amount of from 20 to 94 wt. %, component c) in an amount of from 5 to 60 wt. %, component d) in an amount of from 0.25 to 10 wt. %, component e) in an amount of from 0 to 10, and component f) in an amount of from 0 to 20 wt. %, relative to the polyurethanes or polyurethane polyureas.
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22. The aqueous polyurethane or polyurethane-urea dispersion according to claim 20, wherein component a) comprises N-(2-aminoethyl)-2-aminoethanesulfonate or dimethylol propionate.
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23. The aqueous polyurethane or polyurethane-urea dispersion according to claim 20, wherein component d) consists of aminocarboxylic acids.
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24. A process for producing the aqueous polyurethane or polyurethane-urea dispersion according to claim 20, comprising
a. reacting components a), b), c) and optionally f) in a single-stage or multistage reaction to form an isocyanate-functional prepolymer, b. reacting the prepolymer with component d) and optionally e) in a one- or two-stage reaction c. dispersing in or with water, and d. optionally partially or completely removing a solvent, if present, by distillation during or after dispersing.
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25. A binder combination for coating compound, adhesive and/or sealant applications wherein the binder combination comprises
i) the polyurethane or polyurethane-urea dispersion according to claim 16.
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26. A binder combination according to claim 25, wherein the binder combination further comprises
ii) at least difunctional crosslinkers comprising carboxyl-reactive groups selected from the group consisting of carbodiimides, aziridines, and epoxides.
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27. The binder combination according to claim 26, wherein the binder combination comprises from 75 to 99 wt. % of i) and from 1 to 25 wt. % of ii), and wherein the carboxyl-reactive groups are carbodiimide groups.
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28. The binder combination according to claim 26, wherein the at least one crosslinker comprises aqueous non-ionically hydrophilised, cycloaliphatic carbodiimides having a carbodiimide equivalent weight of about 385.
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29. A method comprising bonding and/or coating and/or lacquering a substrate with a composition which comprises the binder combination according to claim 26.
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30. A coated or bonded substrate comprising the binder combination according to claim 26.
Specification