Assembly of hexaboride fine particles, hexaboride fine particle dispersion, hexaboride fine particle-dispersed body, laminated transparent base material using hexaboride fine particle-dispersed body, infrared-absorptive film, and infrared-absorptive glass

Abstract

There is provided new transparent near infrared absorptive fine particles having a wide range of near infrared absorption, which are an assembly of hexaboride fine particles, wherein when a particle shape of the number of particles contained in the assembly is approximately regarded as a spheroid body, there are 20% or more and less than 80% of particles having an aspect ratio [(long axis length)/(short axis length)] of 1.5 or more and less than 5.0, and there are 20% or more and less than 80% of particles having an aspect ratio of 5.0 or more and less than 20.0.

1 - 16 . (canceled) 
     
     
         17 . An assembly of hexaboride fine particles, wherein when a particle shape of the hexaboride fine particles contained in the assembly is regarded as a spheroid body, and when the number ratio of the hexaboride fine particles contained in the assembly and having an aspect ratio [(long axis length)/(short axis length)] of 1.5 or more and less than 4.0 is expressed as a (number) %, and the number ratio of hexaboride fine particles contained in the assembly and having an aspect ratio [(long axis length)/(short axis length)] of 4.0 or more and less than 20.0 is expressed as b (number) %, 60 (number) %≦(a+b) (number) %≦100 (number) %, and a:b=20:80 to 80:20 are satisfied. 
     
     
         18 . The assembly of hexaboride fine particles according to  claim 17 , wherein the hexaboride fine particles contained in the assembly of the hexaboride fine particles have an average dispersed particle size of 1 nm or more and 100 nm or less. 
     
     
         19 . The assembly of hexaboride fine particles according to  claim 17 , wherein the hexaboride fine particles are lanthanum hexaboride fine particles. 
     
     
         20 . A hexaboride fine particle dispersion, containing the assembly of the hexaboride fine particles according to  claim 17  in a state of being dispersed in a liquid medium, the liquid medium being selected from water, an organic solvent, an oil and fat, a liquid resin, a liquid plasticizer for a plastic, or a mixture of two or more selected from them. 
     
     
         21 . The hexaboride fine particle dispersion according to  claim 20  wherein the hexaboride fine particles are contained in an amount of 0.02 mass % or more and 20 mass % or less. 
     
     
         22 . A hexaboride fine particle-dispersed body, wherein the assembly of the hexaboride fine particles of  claim 17  are dispersed in a thermoplastic resin or a UV curable resin. 
     
     
         23 . The hexaboride fine particle-dispersed body according to  claim 22 , wherein the thermoplastic resin is one kind of resin selected from the group consisting of polyethylene terephthalate resin, polycarbonate resin, acrylic resin, styrene resin, polyamide resin, polyethylene resin, vinyl chloride resin, olefin resin, epoxy resin, polyimide resin, fluororesin, ethylene vinyl acetate copolymer, and polyvinyl acetal resin; or
 a mixture of two or more kinds of resins selected from the resin group; or   a copolymer of two or more kinds of resins selected from the resin group.   
     
     
         24 . The hexaboride fine particle-dispersed body according to  claim 22 , wherein the hexaboride fine particles are contained in an amount of 0.001 mass % or more and 80.0 mass % or less. 
     
     
         25 . The hexaboride fine particle-dispersed body according to  claim 22 , wherein the hexaboride fine particle-dispersed body has a sheet shape, a board shape, or a film shape. 
     
     
         26 . The hexaboride fine particle-dispersed body according to  claim 22 , wherein the content of the assembly of the hexaboride fine particles per unit projected area contained in the hexaboride fine particle-dispersed body is 0.01 g/m 2  or more and 0.5 g/m 2  or less. 
     
     
         27 . A laminated transparent base material using hexaboride fine particle-dispersed body, wherein the hexaboride fine particle-dispersed body of  claim 22  is present between a plurality of transparent base materials. 
     
     
         28 . An infrared absorptive film or an infrared absorptive glass, wherein the hexaboride fine particle-dispersed body of  claim 22  is provided as a coating layer on at least one side of a transparent base material selected from a transparent film base material or a transparent glass base material. 
     
     
         29 . An infrared absorptive film or an infrared absorptive glass according to  claim 28 , wherein the resin is a UV curable resin. 
     
     
         30 . The infrared absorptive film or the infrared absorptive glass according to  claim 28 , wherein the thickness of the coating layer is 10 μm or less. 
     
     
         31 . The infrared absorptive film according to  claim 28 , wherein the transparent film base material is a polyester film. 
     
     
         32 . The infrared absorptive film or the infrared absorptive glass according to  claim 28 , wherein the content of the hexaboride fine particles per unit projected area included in the coating layer is 0.01 g/m 2  or more and 0.5 g/m 2  or less.