Infrared-reflecting colorants
AssigneeClariant GmbH
InventorsAxel Schoenfeld, Andreas Stohr
Life of this patent
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Abstract
Colorant composition consisting essentially of one or more cholesteric liquid-crystalline polymers having a pitch of the helical superstructure of between 760 nm and 500 μm, and of at least one colorant which absorbs light in the visible wavelength range. Suitable colorants are organic or inorganic pigments or dyes. Coatings featuring such colorant compositions are notable for heat insulation properties.
Claims12
A colorant composition consisting essentially of one or more cholesteric liquid-crystalline polymers having a pitch of the helical superstructure of between 760 nm and 500 μm and of at least one colorant which absorbs light in the visible wavelength range.
A process for preparing a colorant composition wherein said colorant composition consists essentially of one or more cholesteric liquid-crystalline polymers having a pitch of the helical superstructure of between 760 nm and 500 μm and of at least one colorant which absorbs light in the visible wavelength range, comprising:
- mixing a melt of the cholesteric liquid-crystalline polymer with the colorant with or without the auxiliaries and additives until distribution is homogeneous, or adding the colorant with or without the auxiliaries and additives during the polycondensation of the polymer;
- and heating the liquid-crystalline polymer to a temperature which is greater than or equal to its chiralization temperature.
A method of providing a heat insulation coating, comprising the step of applying a colorant composition onto an object to be coated wherein said colorant composition consists essentially of one or more cholesteric liquid-crystalline polymers having a pitch of the helical superstructure of between 760 nm and 500 μm and of at least one colorant which absorbs light in the visible wavelength range.
Dependencies are inferred from the claim text.