Pigment, method for producing pigment, pigment dispersion, and electrostatic image developing powder toner
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United States of America Patent
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Aug 31, 2004
Grant Date -
Jun 19, 2003
app pub date -
Mar 19, 2002
filing date -
Sep 21, 2001
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Abstract
A pigment having weak dispersion force to be readily dispersed in a medium to be colored from which an excellent yellow image having superior transparency can be produced. The pigment includes a compound having the same chemical formula as C.I. Pigment Yellow 180. The BET specific surface area based on the nitrogen absorption process of the pigment is 20-100 m.sup.2 /g, and the ratio of the absolute strength of X-ray diffraction at Bragg angle 2.theta.=17.5.degree..+-.0.2.degree. to the absolute strength of X-ray diffraction at Bragg angle 2.theta.=18.2.degree..+-.0.2.degree. of the pigment in a powder X-ray diffraction diagram using a CuK.alpha. characteristic X-ray is less than 1.8/1.0. The present invention also provides a dispersion including the pigment and a thermoplastic resin having excellent transparency and color strength.
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