Method for the preparation of an aqueous dispersion of pearlescent agent

A method for the preparation of an aqueous dispersion of a pearlescent agent which comprises the steps of:

• (a) solubilizing 3 to 80 parts by weight of an organic compound pearlescent agent having a melting point of 50 to 80.degree. C. and capable of forming thin leaf crystals, in 100 parts by weight of an aqueous solution of an anionic surfactant at least a substantial portion of which forms the state of the middle phase (M.sub.1 phase) liquid crystals, at a temperature higher than the melting point of the pearlescent agent to give a uniform aqueous mixture, and (b) cooling the uniform aqueous mixture to crystallize out the pearlescent agent in the mixture while the state of the middle phase (M.sub.1 phase) liquid crystals of the surfactant is kept substantially unchanged.

A method for the preparation of an aqueous dispersion of pearlescent agent which comprises the steps of:

• (a) solubilizing 3 to 50 parts by weight of an organic compound pearlescent agent having a melting point of 50 to 80.degree. C. and capable of forming thin leaf crystals, in 100 parts by weight of an aqueous solution of a cationic surfactant at least a substantial portion of which forms the state of the middle phase (M.sub.1 phase) liquid crystals, at a temperature higher than the melting point of the pearlescent agent to give a uniform aqueous mixture, and (b) cooling the uniform aqueous mixture to crystallize out the pearlescent agent in the mixture while the state of the middle phase (M.sub.1 phase) liquid crystals of the surfactant is kept substantially unchanged.

A method for the preparation of an aqueous dispersion of pearlescent agent which comprises the steps of:

• (a) solubilizing 3 to 60 parts by weight of an organic compound pearlescent agent having a melting point of 50 to 80.degree. C. and capable of forming thin leaf crystals, in 100 parts by weight of an aqueous solution of an amphoteric or a nonionic surfactant at least a substantial portion of which forms the state of the middle phase (M.sub.1 phase) liquid crystals, at a temperature higher than the melting point of the pearlescent agent to give a uniform aqueous mixture, and (b) cooling the uniform aqueous mixture to crystallize out the pearlescent agent in the mixture while the state of the middle phase (M.sub.1 phase) liquid crystals of the surfactant is kept substantially unchanged.