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Metal oxide doped cerium oxides, method for the preparation thereof, resin composition and cosmetic composition therewith

a cerium oxide and metal oxide technology, applied in the direction of lanthanide oxide/hydroxide, other chemical processes, transportation and packaging, etc., can solve the problems of lack of dispersibility of cerium oxides, lack of heat resistance, and lack of durability to weather or the safety of decomposed chemicals, etc., to achieve excellent transparency, reduce catalytic activity, and strong ultraviolet ray shielding ability

Inactive Publication Date: 2005-04-07
DAITO KASEI KOGYO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The metal oxide doped cerium oxides exhibit strong ultraviolet shielding, reduced catalytic activity, and excellent transparency, effectively protecting plastics and cosmetics from UV degradation while maintaining stability and natural appearance.

Problems solved by technology

As the organic ultra violet ray absorbing agent, salicylic acid type compound, benzophenon type compound, benzotriazol type compound or cyanoacrylate type compound can be mentioned, however, recently, the lack of heat resistance, lack of durability to weather or the safety of decomposed chemicals of it are becoming serious problems.
To solve these problems, fine particles of titanium dioxide or fine particles of zinc oxide which are the inorganic ultra violet ray scattering agent are developed, however, the lack of dispersability of these agents is a problem and the catalytic activity of these agent are becoming a new problem.
Recently, especially regarding titanium dioxide, it is pointed out that the generation of singlet oxygen by photo catalyst function of it causes new problem.
Ultraviolet ray has an adverse influence also on living bodies.
However, above mentioned ultraviolet absorbing agents have several problems, such as low absorptivity of ultraviolet ray and safety when the admixing amount in a cosmetic composition is too high.
Further, in a case of conventional ultraviolet scattering agent, since it is impossible to improve the transparency even if the dispersibility of particles is improved, the admixing use of it not only causes the deterioration of feeling when the cosmetic composition is applied but also the skin look becomes unnatural.
However, since cerium oxide has strong catalytic activity, it has a problem that accelerates the oxidation decomposition of resin or oil and causes color change and generates offensive odor when admixed in cosmetic compound or resin.
And in Japanese Patent Laid Open Publication 9-118610, silica-cerium oxide composite particle is proposed, however, the reduction of catalytic activity of said silica-cerium oxide composite particle is almost accomplished but the ability for ultraviolet ray shielding is not sufficient.

Method used

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  • Metal oxide doped cerium oxides, method for the preparation thereof, resin composition and cosmetic composition therewith
  • Metal oxide doped cerium oxides, method for the preparation thereof, resin composition and cosmetic composition therewith
  • Metal oxide doped cerium oxides, method for the preparation thereof, resin composition and cosmetic composition therewith

Examples

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Effect test

example 1

Europium oxide doped cerium oxide particles 342 g of cerium chloride (CeCl3) is dissolved in water and 3 litre of cerium chloride aqueous solution is prepared. 155 g of europium chloride (EuCl3) is dissolved in water and 3 litre of europium chloride aqueous solution is prepared. Further 237 g of sodium hydroxide (NaOH) is dissolved in water and 12 litre of sodium hydroxide aqueous solution is prepared. Furthermore, 118 g of 30 wt % hydrogen peroxide is dissolved in water and 3 litre of hydrogen peroxide aqueous solution is prepared. 12 litre of sodium hydroxide aqueous solution is heated to 30-40° C. and said cerium chloride aqueous solution and europium chloride aqueous solution are added simultaneously by constant stirring maintaining pH of reacting solution higher than 11 and temperature of the solution lower than 40° C. After adding continue the stirring for 30 minutes, maintain the temperature of reacting solution at 60° C., then aqueous solution of hydrogen peroxide is added....

example 2

White colored calcium oxide doped cerium oxide particles 390 g of cerium chloride (CeCl3) is dissolved in water and 3 litre of cerium chloride aqueous solution is prepared. 45 g of calcium chloride (CaCl2) is dissolved in water and 3 litre of aqueous solution of calcium chloride is prepared. Further 237 g of sodium hydroxide (NaOH) is dissolved in water and 8 litre of sodium hydroxide aqueous solution is prepared. Furthermore, 118 g of 30 wt % hydrogen peroxide is dissolved in water and 3 litre of hydrogen peroxide aqueous solution is prepared. To 8 litre of water heated to 30-40° C., said cerium chloride aqueous solution, calcium chloride aqueous solution and sodium hydroxide aqueous solution are added simultaneously by constant siring maintaining pH of reacting solution 9-11 and temperature of the solution lower than 40° C. After the reaction, add hydrochloric acid so as to adjust pH of reacting solution to 5-7 and the temperature of solution to 60° C., the aqueous solution of hy...

example 3

Ultra fine particles of calcium oxide doped cerium oxide. 390 g of cerium chloride (CeCl3) is dissolved in water and 3 litre of cerium chloride aqueous solution is prepared. 45 g of calcium chloride (CaCl2) is dissolved in water and 3 litre of aqueous solution of calcium chloride is prepared. Further 237 g of sodium hydroxide (NaOH) is dissolved in water and 3 litre of sodium hydroxide aqueous solution is prepared. Furthermore, 118 g of 30 wt % hydrogen peroxide is dissolved in water and 3 litre of hydrogen peroxide aqueous solution is prepared. To 8 litre of water heated to 30-40° C., said cerium chloride aqueous solution, calcium chloride aqueous solution and sodium hydroxide aqueous solution are added simultaneously by constant stirring maintaining pH of reacting solution 9-11 and temperature of the solution lower than 40° C. After the reaction, the reacted product is rinsed by water, filtrated and dried, thus the calcium oxide doped cerium oxide whose molar ratio of Ce4+ and Ca...

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Abstract

The present invention relates to the metal oxide doped cerium oxide which has an excellent ultraviolet ray shielding effect and a transparency and whose catalytic activity is reduced. More in detail, relates to the metal oxide doped cerium oxide composed of cerium oxide in which metal ion having larger ion radius than that of Ce4+ and / or lower valence metal ion than Ce4+, such as Ca2+, Y3+, La3+, Nd3+, Eu3+, Tb3+, Sm3+, Mg2+, Sr2+, Ba2+, Ce3+ and so on are doped. Said metal oxide doped cerium oxide can be prepared at the temperature lower than 60 ° C. and in the condition of pH higher than 5 by reacting aqueous solution of cerium salt, aqueous solution of metal ion having larger ion radius than that of Ce4+ and / or lower valence metal ion than Ce4+ and alkali, then adding oxidizing agent. Further, said metal oxide doped cerium oxide can be blended to resin composition or cosmetic composition and can display and ultraviolet shielding effect without spoiling transparency at visible ray region.

Description

BACKGROUND OF THE INVENTION 1. Field of the invention The present invention relates to metal oxide doped cerium oxides and a method for the preparation thereof Further, the present invention relates to a resin composition or a cosmetic composition in which said metal oxide doped cerium oxides or a complex composed of said metal oxide solid doped cerium oxides and an oxide are blended. 2. Description of the Prior Art As is well known, ultra violet ray causes degradation of plastic resins, and many kinds of countermeasure are carried out to protect the degradation. As one of the countermeasure method, it is widely practiced that a plastic resin is admixed with an ultraviolet shielding agent including an organic ultra violet ray absorbing agent or an inorganic ultraviolet ray scattering agent. And by admixing these agents in plastic resin, the adverse influence of ultra violet ray is reduced. As the organic ultra violet ray absorbing agent, salicylic acid type compound, benzophenon...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61K8/00A61K8/19A61K8/25A61K8/26A61K8/29A61K8/30A61K8/33A61K8/35A61K8/37A61Q1/00A61Q1/02A61Q1/04A61Q1/06A61Q1/12A61Q17/04C01F17/224C01F17/235C08K3/26C08K9/02C08L101/00C09C1/00C09C3/06C09K3/00
CPCA61K8/19Y10T428/2998A61Q1/06A61Q17/04B82Y30/00C01F17/0018C01F17/0043C01P2002/52C01P2002/72C01P2002/84C01P2004/64C01P2006/12C01P2006/40C01P2006/60C01P2006/90C08K9/02C09C1/00Y10T428/2991Y10T428/2993A61Q1/02C01F17/32C01F17/235C01F17/224C01F17/206
Inventor YABE, SINRYOTOFUKUJI, KOTAMOMOSE, SHIGEYOSHIYOSHIDA, SAKAETAHIRA, KAZUYUKISATO, TSUGIO
Owner DAITO KASEI KOGYO CO LTD
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