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

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 Ce 4+ and/or lower valence metal ion than Ce 4+ , such as Ca 2+ , Y 3+ , La 3+ , Nd 3+ , Eu 3+ , Tb 3+ , Sm 3+ , Mg 2+ , Sr 2+ , Ba 2+ , Ce 3+ 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 Ce 4+ and/or lower valence metal ion than Ce 4+ 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.

1 . Metal oxide doped cerium oxide composed of cerium oxide in which metal ion having larger ion radius than that of tetravalent cerium ion and/or lower valence metal ion than tetravalent cerium ion are doped.  
     
     
         2 . The metal oxide doped cerium oxide of  claim 1 , wherein a metal ion to be doped is at least one selected from the group composed by Ca 2+ , Y3+, La 3+ , Nd 3+ , Eu 3+ , Tb 3+ , Sm 3+ , Mg 2+ , Sr 2+ , Ba 2+  and Ce 3+ .  
     
     
         3 . The metal oxide doped cerium oxide of  claim 1  or  2  wherein the content of cerium oxide in the metal oxide doped cerium oxide is 40 to 98 molar %.  
     
     
         4 . The metal oxide doped cerium oxide of  claim 1 ,  2  or  3 , wherein color index of said metal oxide doped cerium oxides estimated by L*, a* and b* space, L* is bigger than 80, a* is smaller than 4 by absolute value and b* is smaller than 10 by absolute value.  
     
     
         5 . The metal oxide doped cerium oxide of  claim 1 ,  2 ,  3  or  4 , wherein the metal oxide doped cerium oxide is composed of an ultra fine particle whose average particle size is 2 to 4 nm.  
     
     
         6 . A preparation method of the metal oxide doped cerium oxide of  claim 1 ,  2 ,  3 ,  4  or  5  comprising, preparing the metal oxide doped cerium oxide 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 tetravalent cerium ion and/or lower valence metal ion than tetravalent cerium ion and alkali, then adding oxidizing agent at the temperature lower than 60° C.  
     
     
         7 . A preparation method of the metal oxide doped cerium oxide of  claim 1 ,  2 ,  3 ,  4  or  5  comprising, preparing by adding and mixing aqueous solution of cerium salt, aqueous solution of metal ion having larger ion radius than that of tetravalent cerium ion and/or lower valence metal ion than tetravalent cerium ion, alkali and oxidizing agent simultaneously at the temperature lower than 60° C. and in the condition of pH higher than 5.  
     
     
         8 . A composite comprising the metal oxide doped cerium oxide of  claim 1 ,  2 ,  3 ,  4  or  5  which is coated by one or more kinds of oxide selected from the group composed of silicon oxide, zirconium oxide, aluminium oxide, iron oxide and titanium dioxide.  
     
     
         9 . A resin composition to which the metal oxide doped cerium oxide of  claim 1 ,  2 ,  3 ,  4 , or  5  or the composite of  claim 8  is blended.  
     
     
         10 . A cosmetic composition to which the metal oxide doped cerium oxide of  claim 1 ,  2 ,  3 ,  4 , or  5  or the composite of  claim 8  is blended.  
     
     
         11 . A cosmetic composition to which the metal oxide doped cerium oxide of  claim 1 ,  2 ,  3 ,  4 , or  5  or the composite of  claim 8  whose surface is treated is blended.  
     
     
         12 . A cosmetic composition of  claim 10  or  11  to which an ultraviolet ray absorbing agent and/or an ultraviolet ray scattering agent are blended.  
     
     
         13 . The cosmetic composition of  claim 12 , wherein the ultraviolet ray absorbing agent is one or more kinds of compound selected from the group composed of oxybenzone, octyl metoxycinnamate and 4-tert-butyl-4′-methoxy dibenzoylmethane.  
     
     
         14 . The cosmetic composition of  claim 12  or  13 , wherein the content of the ultraviolet ray absorbing agent is 0.1 to 40 % by weight.  
     
     
         15 . The cosmetic composition of  claim 12 , wherein the ultraviolet ray scattering agent is titanium dioxide and/or zinc oxide.  
     
     
         16 . The cosmetic composition of  claim 12  or  15 , wherein the content of the ultraviolet ray scattering agent is 0.1 to 50 % by weight.  
     
     
         17 . The cosmetic composition of  claim 10 ,  11 ,  12 ,  13 ,  14  or  15 , which has a sunscreening effect.