| 摘要 |
The present invention provides a method for producing an optical interference pigment, said method being characterized by comprising a step of hardening the alignment state of a polymerizable liquid crystal compound to produce a film having a fixed cholesteric liquid crystal structure, a step of crushing the film having a cholesteric liquid crystal structure to produce optical interference particles, and a step of washing the optical interference particles at a temperature of 35˚C or higher using at least an organic solvent having an SP value of 8.5 to 12 (cal/cm3)1/2, wherein the SP value represents a solubility parameter (δ) as measured by a Hoy method and is represented by formula (1): δ = (&Dgr;E/V)1/2 (wherein V represents the molar molecular volume of the solvent; and &Dgr;E represents a cohesive energy). The production method enables the provision of an optical interference pigment that has good light reflection performance at a selective reflection wavelength when being dispersed in a dispersion medium. |
