Multilayer color and/or effect giving coating and method of forming a basecoat layer
A multilayer color and/or effect coating on a substrate, wherein the coating includes a clearcoat layer having a dry film thickness of 10 μm to 50 μm, and the coating includes a basecoat layer having a dry film thickness of 6 μm to 35 μm, incorporating color and/or effect pigments whose orientation within the basecoat layer influences the optical properties of the coating, and the basecoat layer includes control particles that control the orientation of the color and/or effect pigments, wherein the control particles are characterized by a d10 of at least 50% of the dry film thickness of the basecoat layer and by a d50 of 80% to 120% of the dry film thickness of the basecoat layer, and by a d100 of not more than 200% of the dry film thickness of the basecoat layer.
1. A multilayer color and/or effect coating on a substrate, comprising:
a. a clearcoat layer having a dry film thickness of 10 μm to 50 μm, and
b. a basecoat layer having a dry film thickness of 6 μm to 35 μm, incorporating color and/or effect pigments whose orientation within the basecoat layer influences optical properties of the coating, and
c. wherein the basecoat layer comprises control particles that control the orientation of the color and/or effect pigments,
wherein the control particles are spherical in formation and comprise
d. a d10 of at least 50% of the dry film thickness of the basecoat layer and
e. a d50 of 80% to 120% of the dry film thickness of the basecoat layer, and
f. a d100 of not more than 200% of the dry film thickness of the basecoat layer; and
wherein the substrate is a polymeric film.
2. The coating as claimed in claim 1 , wherein the control particles comprise plastic that is stable to organic solvents selected from ethyl alcohol and methyl alcohol, xylene, butyl acetate and methoxypropyl acetate.
3. The coating as claimed in claim 1 , wherein the basecoat layer comprises the control particles in an amount of 2 wt % to 15 wt %.
4. The coating as claimed in claim 1 , wherein d50 of the color and/or effect pigments is not more than 5 times the d50 of the control particles.
5. A method of forming a basecoat layer comprising:
a. applying a basecoat material to a polymeric film to form a basecoat film, wherein the basecoat material comprising color and/or effect pigments whose orientation within the basecoat layer influences the optical properties thereof, and control particles for controlling the orientation of the color and/or effect pigments in the basecoat layer, and
b. drying and/or curing the basecoat film to form the basecoat layer,
wherein
c. the solids fraction of the basecoat material and/or the thickness of the basecoat film are/is adjusted such that the basecoat layer is obtained with a dry film thickness of 6 μm to 35 μm, and
d. the control particles are spherical in formation and comprise
a d10 of at least 50% of the dry film thickness of the basecoat layer,
a d50 of 80% to 120% of the dry film thickness of the basecoat layer, and
a d100 of not more than 200% of the dry film thickness of the basecoat layer.
6. The method as claimed in claim 5 , wherein the basecoat material is applied with a directed application method.
7. The method as claimed in claim 5 , wherein the control particles are added to bring about an isotropic arrangement of the color and/or effect pigments in the basecoat layer by minimizing the effect of the viewing angle on the visual appearance of the basecoat layer.
8. The coating as claimed in claim 1 , wherein the color and/or effect pigments in the basecoat layer are in an isotropic arrangement so that the effect of the viewing angle on the visual appearance of the basecoat layer is minimized.
9. The coating as claimed in claim 1 , wherein the control particles comprise plastic that has a thermal stability up to 140° C.
10. The coating as claimed in claim 1 , wherein the basecoat layer comprises the color and/or effect pigments in an amount of 0.15 wt % to 15 wt %.