Use of particulate emulsifiers in abhesive siloxane-containing coating materials
View Patent ↗The invention relates to a durably homogeneous, low-viscosity, radiation-curable coating material comprising a) x (meth)acrylated polysiloxanes and if desired b) y (meth)acrylated organic compounds and c) at least one particulate emulsifier having an average particle size of <1000 nm in at least one dimension, with the proviso that x≧1, y≧0, the sum of x+y≧2 and the mixture of components a) and b) alone is not durably homogeneous.
1. A durably homogeneous, low-viscosity, radiation-curable coating material comprising
a) x number of different (meth)acrylated polysiloxanes
and if desired
b) y number of (meth)acrylated organic compounds
and
c) at least one particulate emulsifier having an average particle size of <1000 nm in at least one dimension,
with the proviso that
x≧1,
y≧0,
the sum of x+y≧2
and the mixture of components a) and b) alone is not durably homogeneous.
2. The coating material as claimed in claim 1 , wherein component c) is selected from the group consisting of finely divided, hydrophobically modified silicas, silicone resin particles, phyllosilicates, bentonites or metal oxides, and mixtures thereof.
3. The coating material as claimed in claim 2 , wherein the silicas have been hydrophobized with at least one compound selected from the group consisting of silanes, siloxanes, and quaternary ammonium compounds.
4. The coating material as claimed in claim 1 , wherein component c) is structurally modified silicas.
5. The coating material as claimed in claim 1 , wherein the particle size of component c) in at least one dimension is <500 nm.
6. The radiation-curable coating material as claimed in claim 1 , wherein at least one photoinitiator and/or at least one photosensitizer is included in amounts of 0.1% to 5% by weight, based on the weight of the acrylate-functional silicone materials.
7. The radiation-curable coating material as claimed in claim 1 , wherein stabilizers, fillers, pigments and/or further customary additives are included.
8. A method of producing an adhesive coating which comprises of adding the coating material of claim 1 to a coating composition.
9. The method of claim 8 , wherein the adhesive coating is a non-matted adhesive coating.
10. A method of coating a surface which comprises of applying the coating material as claimed in claim 1 to a surface.
11. The method of claim 10 , wherein the surface is a polymeric film.
12. The method of claim 10 , wherein the surface is a porous or absorbent substrate.
13. The method of claim 10 , wherein the surface is paper.