Solution of gallium phthalocyanine method for preparing the same method for producing gallium phthalocyanine crystal method for purifying composition containing gallium phthalocyanine and method for producing electrophotographic photosensitive member

A method for producing a gallium phthalocyanine crystal, comprising:

• (a1) dissolving a gallium phthalocyanine represented by the formula (2) in a compound represented by the formula (1), to prepare a solution of a gallium phthalocyanine represented by the formula (2),
• wherein, in the formula (2),
• X1 represents a chlorine atom or a hydroxy group
• H2N—CH2—R1—CH2—NH2 (1)
• wherein, in the formula (1), R1 represents a single bond, or a substituted or unsubstituted alkylene group having 1 to 10 main-chain carbon atoms,
• a substituent of the substituted alkylene group is an alkyl group having 1 to 3 carbon atoms, an alkyl group having 1 to 3 carbon atoms and being substituted with an amino group, or a hydroxy group,
• one of the carbon atoms in the main chain of the alkylene group may be replaced with an oxygen atom, a sulfur atom, or a bivalent group represented by the formula —NR2—, and
• R2 represents a hydrogen atom, an alkyl group having 1 to 3 carbon atoms, or an alkyl group having 1 to 3 carbon atoms and being substituted with an amino group, and
• (b1) mixing the solution prepared in the step (a1) with a poor solvent for the gallium phthalocyanine represented by the formula (2) to perform the crystal transformation of the gallium phthalocyanine represented by the formula (2), thereby forming a hydroxygallium phthalocyanine crystal having peaks at Bragg angles 2θ of 6.9°±0.3° and 26.6°±0.3° in X-ray diffraction with CuKα radiation or a hydroxygallium phthalocyanine crystal having peaks at Bragg angles 2θ of 7.4°±0.3° and 28.3°±0.3° in X-ray diffraction with CuKα radiation.