Process for producing zinc sulfide particles
AssigneeFuji Photo Film Co., Ltd.
InventorsMilan Hubacek, Kenji Takahashi
Life of this patent
Estimating the term…
Abstract
A mixed melt, which contains urea and/or a urea derivative and contains a sulfur source and a zinc source, is prepared. A temperature of the mixed melt is raised, and a precipitate of zinc sulfide is thereby formed. The temperature of the mixed melt is raised even further, and a solid material containing the zinc sulfide is thereby formed. The solid material is fired, and organic constituents contained in the solid material are thus removed. Zinc sulfide particles having uniform particle size and free from inclusion of impurities are thus produced without any precipitant being added.
Claims16
A process for producing zinc sulfide particles, comprising the steps of:
- i) preparing a mixed melt, which contains urea and/or a urea derivative and contains a sulfur source and a zinc source,
- ii) raising the temperature of the mixed melt, a precipitate of zinc sulfide being thereby formed without any precipitant being added,
- iii) raising the temperature of the mixed melt even further, a solid material containing the zinc sulfide being thereby formed, and
- iv) firing the solid material, organic constituents contained in the solid material being thereby removed.
A process for producing zinc sulfide particles having a surface covered with a metal compound, comprising the steps of:
- i) preparing a zinc sulfide particle precursor by:
- a) preparing a mixed melt, which contains urea and/or a urea derivative and contains a sulfur source and a zinc source,
- b) raising the temperature of the mixed melt, a precipitate of zinc sulfide being thereby formed without any precipitant being added,
- c) raising the temperature of the mixed melt even further, a solid material containing the zinc sulfide being thereby formed, and
- d) grinding the solid material,
- ii) preparing a metal compound-containing material by:
- a) preparing a mixed melt, which contains urea and/or a urea derivative and contains a metal compound,
- b) raising the temperature of the mixed melt, a solid material containing the metal compound being thereby formed, and
- c) grinding the solid material,
- iii) mixing the zinc sulfide particle precursor and the metal compound-containing material with each other,
- iv) firing the resulting mixture of the zinc sulfide particle precursor and the metal compound-containing material, organic constituents contained in the mixture of the zinc sulfide particle precursor and the metal compound-containing material being thereby removed, whereby the metal compound-containing material adheres to the surface of the particles of the zinc sulfide particle precursor, and
- v) obtaining zinc sulfide particles having a surface covered with a metal compound.
Dependencies are inferred from the claim text.