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AssigneeM. Technique Co., Ltd.
InventorsMasaki Maekawa, Daisuke Honda, Masakazu Enomura
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A quinacridone pigment composition contains quinacridone microparticles which have durability and spectral characteristics equivalent to those required for a magenta color of a dye. The quinacridone pigment composition contains at least one type of quinacridone microparticles, wherein a difference between the maximum transmittance (Tmax1) and the minimum transmittance (Tmin) is 80% or more in a transmission spectrum at 350 nm to 800 nm and the difference between the maximum and minimum transmittance is 30% or more in a transmission spectrum at 350 nm to 580 nm, or the difference between the maximum transmittance (Tmax1) and the minimum transmittance (Tmin) is 80% or more in a transmission spectrum at 350 nm to 800 nm and the wavelength (λmax) at which the transmittance in a transmission spectrum at 350 nm to 500 nm becomes maximum is less than 430 nm. A method is provided for producing the quinacridone microparticles.
A quinacridone pigment composition containing at least one kind of quinacridone microparticle, wherein difference between a maximum transmittance (Tmax1) and a minimum transmittance (Tmin) in 350 nm to 800 nm of a transmission spectrum thereof (Tmax1−Tmin) is 80% or more and difference between a maximum transmittance (Tmax2) and a minimum transmittance (Tmin) in 350 nm to 580 nm (Tmax2−Tmin) is 30% or more.
A quinacridone pigment composition containing at least one kind of quinacridone microparticle, wherein difference between a maximum transmittance (Tmax1) and a minimum transmittance (Tmin) in 350 nm to 800 nm of a transmission spectrum thereof (Tmax1−Tmin) is 80% or more and a wavelength to give a maximum transmittance (λmax) in 350 nm to 500 nm is shorter than 430 nm.
Dependencies are inferred from the claim text.