Composition and method for controlling the wettability of surfaces
The present invention relates to a composition comprising hedge-hog shaped particles, at least one binder, and at least one hydrophobizing agent and/or at least one hydrophilizing agent, a method for controlling the wettability of substrate surfaces using these compositions, as well as a material comprising these compositions.
1. A composition comprising:
a) a mixture of hydrophilized hedgehog shaped particles pre-treated and coated with at least one hydrophilizing agent but not a hydrophobizing agent and hydrophobized hedgehog shaped particles pre-treated and coated with at least one hydrophobizing agent but not a hydrophilizing agent, wherein the hedgehog shaped particles are composed of a calcium carbonate containing material, and
b) at least one binder.
2. The composition according to claim 1 , wherein the hedgehog shaped particles are composed of aragonitic precipitated calcium carbonate in a form of clusters of needle like crystals.
3. The composition according to claim 1 , wherein the hedgehog shaped particles are clusters and/or aggregates of scalenohedral precipitated calcium carbonate.
4. The composition according to claim 1 , wherein the hedgehog shaped particles have a BET specific surface area of from 1 to 50 m 2 /g, measured using nitrogen and the BET method according to ISO 9277.
5. The composition according to claim 1 , wherein the hedgehog shaped particles have a BET specific surface area of from 2 to 40 m 2 /g, measured using nitrogen and the BET method according to ISO 9277.
6. The composition according to claim 1 , wherein the hedgehog shaped particles have a BET specific surface area of from 11 to 35 m 2 /g, measured using nitrogen and the BET method according to ISO 9277.
7. The composition according to claim 1 , wherein the hedgehog shaped particles have a BET specific surface area of from 15 to 20 m 2 /g, measured using nitrogen and the BET method according to ISO 9277.
8. The composition according to claim 1 , wherein the hedgehog shaped particles have a weight median particle diameter d 50 of from 1 μm to 50 μm.
9. The composition according to claim 1 , wherein the hedgehog shaped particles have a weight median particle diameter d 50 of from 2 μm to 40 μm.
10. The composition according to claim 1 , wherein the hedgehog shaped particles have a weight median particle diameter d 50 of from 3 μm to 30 μm.
11. The composition according to claim 1 , wherein the hydrophobizing agent is selected from the group consisting of fatty acids, stearic acid, palmitic acid, and their salts; alkylketene dimer; polyacrylamide resins; silicone resins, polysiloxanes, polysiloxane modified with a functional silicone resin, and any mixture thereof.
12. The composition according to claim 1 , wherein the hydrophilizing agent is selected from the group consisting of polyacrylic acids, salts of 1-hydroxyethane-1,1-diphosphonic acid, alkali metal salts thereof, potassium salts thereof; chelates of 1-hydroxyethane-1,1-diphosphonic acid, aluminium hydroxide chelates thereof, aluminium hydroxide/1-hydroxyethane-1,1-diphosphonic acid chelates having a weight ratio of 1:5, and any mixture thereof.
13. The composition according to claim 1 , wherein the at least one hydrophobizing agent and the least one hydrophilizing agent are present in a total amount of from 0.1 to 10 wt %, based on the weight of the hedgehog shaped particles.
14. The composition according to claim 1 , wherein the at least one hydrophobizing agent and the least one hydrophilizing agent are present in a total amount of from 0.2 to 5 wt %, based on the weight of the hedgehog shaped particles.
15. The composition according to claim 1 , wherein the at least one hydrophobizing agent and the least one hydrophilizing agent are present in a total amount of from 0.3 to 2.4 wt %, based on the weight of the hedgehog shaped particles.
16. The composition according to claim 1 , wherein the at least one hydrophobizing agent and the least one hydrophilizing agent are present in a total amount of from 0.4 to 1.9 wt %, based on the weight of the hedgehog shaped particles.
17. The composition according to claim 1 , wherein the at least one hydrophobizing agent and the least one hydrophilizing agent are present in a total amount of from 0.5 to 1.5 wt %, based on the weight of the hedgehog shaped particles.
18. The composition according to claim 1 , wherein the binder is selected from the group consisting of latex binders, hybrid binder systems; homopolymers or copolymers of acrylic and/or methacrylic acids, itaconic acid; acid esters, ethylacrylate, or butyl acrylate; styrene, unsubstituted or substituted vinyl chloride, vinyl acetate, ethylene, butadiene, acrylamides and acrylonitriles; silicone resins, water dilutable alkyd resins, acrylic/alkyd resin combinations, polyvinyl alcohol, natural oils, linseed oil, and any mixture thereof.
19. The composition according to claim 1 , wherein the binder is present in an amount of up to 250 wt %, based on the weight of the hedgehog shaped particles.
20. The composition according to claim 1 , wherein the binder is present in an amount of up to 200 wt %, based on the weight of the hedgehog shaped particles.
21. The composition according to claim 1 , wherein the binder is present in an amount of up to 150 wt %, based on the weight of the hedgehog shaped particles.
22. The composition according to claim 1 , wherein the binder is present in an amount of up to 120 wt %, based on the weight of the hedgehog shaped particles.
23. The composition according to claim 1 , wherein the binder is present in an amount of 1 to 50 wt %, based on the weight of the hedgehog shaped particles.
24. The composition according to claim 1 , wherein the binder is present in an amount of 3 to 25 wt %, based on the weight of the hedgehog shaped particles.
25. The composition according to claim 1 , wherein the binder is present in an amount of 5 to 20 wt %, based on the weight of the hedgehog shaped particles.
26. The composition according to claim 1 , wherein the binder is present in an amount of 10 to 15 wt %, based on the weight of the hedgehog shaped particles.
27. The composition according to claim 1 , which is in the form of a solution or dispersion in a liquid medium, or is in the form of a medium selected from the group consisting of water, alcohol ethers, alcohols, aliphatic hydrocarbons, esters, and any mixture thereof.
28. The composition according to claim 27 , further comprising additives selected from the group consisting of dispersing agents, siliconizing agents, thickeners, rheology modifiers, anti-settling agents, defoamers, antioxidants, bluing agents, surfactants, crosslinkers, flame retardants, catalysts, pH buffers, fillers, dyes, pigments, optical brightners, waxes, coalescence agents, biocides and any mixture thereof.
29. A coating formulation comprising the composition according to claim 1 .
30. A material comprising the composition according to claim 1 , wherein the material is selected from the group consisting of paper, board, wall-paper, wood, wood composites, lake board, plastics, foil, concrete, coated or uncoated rendering, plaster, metals, ceramics, stone, brickstone and glass.