NOVEL QUINACRIDONE PIGMENT COMPOSITION, AND METHOD FOR PRODUCING QUINACRIDONE MICROPARTICLES
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United States of America Patent
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Issued Date -
Mar 28, 2013
app pub date -
Mar 4, 2011
filing date -
Jun 16, 2010
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Abandoned
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Abstract
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.
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