Described is a treated inorganic particle having an organic treatment layer, which can provide crystallization benefits to polymer resins. The treated inorganic particle has a mean particle size of about 0.1-10 m, and the organic treatment layer is an alkali metal salt or alkaline earth metal salt of an acid; where the acid is an aromatic acid or organic diacid. The treated inorganic particles increase crystallization temperature, increase crystal formation rate, and/or decrease cooling time needed for the solidification of the polymer compared with pigmented resins using other inorganic particles.

The present invention relates to ester-coated core particles, thermoplastic polymer composition comprising a thermo-plastic polymer and such coated particles, a method for producing ester coated particles and the use of compositions of the invention as fillers or pigments with improved dispersion properties and pourability.

A method includes a step of preparing a nanoparticle that has a perovskite-type crystal structure as an allotrope and includes multiple crystal structures, a step of preparing a ligand solution containing a solvent that has a relative dielectric constant of a prescribed value or less and an associative ligand that includes a main chain having a plurality of carbon atoms and a polar group having a higher polarity than the main chain and self-associates in the solvent, and a step of preparing a nanoparticle dispersion by bringing the nanoparticle and the ligand solution into contact with each other, wherein the step of preparing a nanoparticle dispersion includes a step of selectively increasing the ratio of the content of a prescribed crystal structure in the multiple crystal structures.

A method includes a step of preparing a nanoparticle that has a perovskite-type crystal structure as an allotrope and includes multiple crystal structures, a step of preparing a ligand solution containing a solvent that has a relative dielectric constant of a prescribed value or less and an associative ligand that includes a main chain having a plurality of carbon atoms and a polar group having a higher polarity than the main chain and self-associates in the solvent, and a step of preparing a nanoparticle dispersion by bringing the nanoparticle and the ligand solution into contact with each other, wherein the step of preparing a nanoparticle dispersion includes a step of selectively increasing the ratio of the content of a prescribed crystal structure in the multiple crystal structures.