Crystalline ceric oxide sol and process for producing the same
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C01P-017/00
C09G-001/02
출원번호
US-0076500
(2002-02-19)
우선권정보
JP-0052483 (2001-02-27)
발명자
/ 주소
Ota, Isao
Nishimura, Tohru
Tanimoto, Kenji
출원인 / 주소
Nissan Chemical Industries, Ltd.
대리인 / 주소
Oliff & Berridge, PLC
인용정보
피인용 횟수 :
12인용 특허 :
6
초록▼
Substantially monodisperse crystalline ceric oxide sols and processes for producing such sols are provided. Sols include crystalline ceric oxide particles having a particle size I (particle size converted from specific surface area by gas absorption method) ranging from 10 nm to 200 nm and a ratio o
Substantially monodisperse crystalline ceric oxide sols and processes for producing such sols are provided. Sols include crystalline ceric oxide particles having a particle size I (particle size converted from specific surface area by gas absorption method) ranging from 10 nm to 200 nm and a ratio of particle size II (particle size measured by dynamic light scattering method) to particle size I ranging from 2 to 6. Sols can be prepared by reacting a cerium (III) salt with an alkaline substance in an aqueous medium under an inert gas atmosphere to obtain a suspension of cerium (III) hydroxide, immediately blowing oxygen or a gas containing oxygen into the suspension to obtain a sol comprising crystalline ceric oxide particles, and wet grinding the resulting sol. Sols are also prepared by calcining cerium carbonate at a temperature of 300 to 1100° C. to give cerium oxide particles, and wet-grinding the resulting particles.
대표청구항▼
1. A sol comprising crystalline ceric oxide particles, in which the particles have particle size I ranging from 10 nm to 200 nm and a ratio of particle size II to the particle size I ranging from 2 to 6, wherein the particle size I is a particle size converted from a specific surface area by gas ads
1. A sol comprising crystalline ceric oxide particles, in which the particles have particle size I ranging from 10 nm to 200 nm and a ratio of particle size II to the particle size I ranging from 2 to 6, wherein the particle size I is a particle size converted from a specific surface area by gas adsorption method, and the particle size II is a particle size measured by dynamic light scattering method. 2. A process for producing a sol comprising crystalline ceric oxide particles according to claim 1, characterized in that comprises the following steps A and B: Step A of reacting a cerium (III) salt with an alkaline substance in (OH-)/(Ce3+) molar ratio ranging from 3 to 30 in an aqueous medium under an inert gas atmosphere to produce a suspension of cerium (III) hydroxide, and immediately blowing oxygen or a gas containing oxygen into the suspension at a temperature of 10 to 95° C. under an atmospheric pressure to produce a sol comprising crystalline ceric oxide particles, in which the particles have particle size I ranging from 10 nm to 200 nm and a ratio of particle size II to the particle size I ranging 10 or more, wherein the particle size I is a particle size converted from a specific surface area by gas adsorption method, and the particle size II is a particle size measured by dynamic light scattering method; and Step B of wet-grinding the sol obtained in step A. 3. A process for producing according to claim 2, wherein the alkaline substance is a hydroxide of alkaline metal, an organic base or a mixture thereof. 4. A process for producing according to claim 2, wherein the gas containing oxygen is air or a mixed gas of oxygen and nitrogen. 5. A process for producing a sol comprising crystalline ceric oxide particles according to claim 1, characterized in that the process comprises the following steps a and b: Step a of calcining cerium carbonate at a temperature of 300 to 1100° C. to give crystalline cerium oxide particles; and Step b of wet-grinding the particles obtained in step a. 6. A process for producing according to claim 2, wherein the wet-grinding is carried out with a wet-ball mill, a sand grinder, an attritor, a perl mill, an ultrasonic homogenizer, a pressure homogenizer or an ultimaizer. 7. An aqueous slurry comprising organic-inorganic complex particles, in which the crystalline ceric oxide particles according to claim 1 are adsorbed on negatively charged polymer particles. 8. A process for producing according to claim 3, wherein the gas containing oxygen is air or a mixed gas of oxygen and nitrogen. 9. A process for producing according to claim 3, wherein the wet-grinding is carried out with a wet-ball mill, a sand grinder, an attritor, a perl mill, an ultrasonic homogenizer, a pressure homogenizer or an ultimaizer. 10. A process for producing according to claim 4, wherein the wet-grinding is carried out with a wet-ball mill, a sand grinder, an attritor, a perl mill, an ultrasonic homogenizer, a pressure homogenizer or an ultimaizer. 11. A process for producing according to claim 5, wherein the wet-grinding is carried out with a wet-ball mill, a sand grinder, an attritor, a perl mill, an ultrasonic homogenizer, a pressure homogenizer or an ultimaizer.
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