Coatings with a cholesteric effect and method for the production thereof
First Claim
Patent Images
1. A process for producing a cholesteric layer that comprises:
- applying at least one layer of a curable, pourable cholesteric mixture to a substrate and forming a solid cholesteric layer, wherein said solid cholesteric layer has a mean fluctuation in layer thickness of less than ±
0.2 μ
m.
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Accused Products
Abstract
Improved cholesteric special-effect layers are obtainable by comminuting cholesteric layers. These cholesteric layers are produced by applying at least one layer of a reactive, pourable cholesteric mixture to a moving substrate, by casting, and forming a solid cholesteric layer.
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Citations
29 Claims
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1. A process for producing a cholesteric layer that comprises:
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applying at least one layer of a curable, pourable cholesteric mixture to a substrate and forming a solid cholesteric layer, wherein said solid cholesteric layer has a mean fluctuation in layer thickness of less than ±
0.2 μ
m.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 14, 28, 29)
(a) at least one cholesteric, polymerizable monomer in an inert diluent, (b) at least one achiral, nematic, polymerizable monomer and one chiral compound in an inert diluent, (c) at least one cholesteric, crosslinkable oligomer or polymer in an inert diluent, (d) a cholesteric polymer in a polymerizable diluent, and (e) at least one cholesteric polymer whose cholesteric phase can be frozen in by rapid cooling to below the glass transition temperature.
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4. The process of claim 1, wherein the curable, pourable cholesteric mixture has a viscosity in the range from about 10 to 500 mPas, measured at 23°
- C.
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5. The process of claim 1, wherein the cholesteric mixture is applied to the substrate at a rate in the range from about 1 to 800 m/min.
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6. The process of claim 1, wherein the mixture is applied to the substrate by means of a casting apparatus selected from a reverse roll coater, a kiss coater, a cast-film extruded, a bar coater or a knife coater.
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7. The process of claim 1, wherein the mixture applied to the substrate is dried and subsequently or alternatively is cured by means of heat, UV or electron beams.
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8. The process of claim 1,
wherein the substrate is coated with at least one further cholesteric mixture of the same or different composition; - or
wherein the substrate is coated, before, after or between the application of the cholesteric layer(s), with at least one further layer selected from a release layer, a layer which absorbs transmitted light, an adhesive layer, stabilizer layer, support layer, protective layer or cover layer.
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9. The process of claim 1, wherein the fully cured layer structure which is applied to the substrate is removed therefrom and, optionally, is comminuted to form a pigment.
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14. A pigment obtained by comminuting a material produced by the process of claim 1.
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28. A product or composition comprising a cholesteric material produced by the process of claim 1.
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29. A product or composition comprising a cholesteric material produced by the process of claim 2.
- 10. A cholesteric material comprising at least one cholesteric layer that has a mean fluctuation in layer thickness of less than ±
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23. A product or composition comprising a cholesteric material comprising at least one cholesteric layer that has a mean fluctuation in layer thickness of less than ±
- 0.2 μ
m. - View Dependent Claims (24)
- 0.2 μ
Specification