Heat insulating container and manufacture method therefor

Abstract

A heat insulating container is described, including an outer glass container and an inner glass container housed therein with a gap formed in-between as a heat insulating layer. A radiant heat preventive film containing a metal oxide is disposed on at least one of the external surface of the inner container or the internal surface of the outer container, wherein the radiant heat preventive film has a reflectivity of 35% or higher with a wavelength of 15 μm. When the thickness of the radiant heat preventive film is 3000 Å, the Hall mobility “x” (cm 2 /V·s) and the carrier concentration “y” (cm −3 ) of the same satisfy the following formulae: y≧−5×10 20 x+2×10 21 and y≧−6×10 18 x+3×10 20 . When the thickness of the radiant heat preventive film is 5000 Å, x and y satisfy the following formulae: y≧−5×10 20 x+3×10 21 and y≧−6×10 18 x+7×10 20 . Such radiant heat preventive films can have high reflectivity.

1 - 8 . (canceled)  
   
   
       9 . A manufacture method of a heat insulating container, comprising: 
 forming a film which contains a metal oxide on at least one of an external surface of an inner glass container and an internal surface of an outer glass container; and    heating the metal oxide film at a temperature of about 400° C. or higher in a non-oxidative environment for 10 minutes or longer to form a radiant heat preventive film.    
   
   
       10 . A manufacture method of a heat insulating container, comprising housing an inner glass container in an outer glass container with a gap formed in between; 
 integrally joining the inner glass container and the outer glass container;    adhering a raw material of a metal oxide to at least one of an external surface of the inner glass container or an internal surface of the outer glass container;    heating the integrally joined inner glass container and outer glass container at a temperature of about 400° C. or higher in an oxidative environment for 10 minutes or longer; and    heating the integrally joined inner glass container and outer glass container at a temperature of about 400° C. or higher in a non-oxidative environment for 10 minutes or longer to form a radiant heat preventive film.    
   
   
       11 . A manufacture method of a heat insulating container, comprising: 
 forming a metal oxide film on at least one of an external surface of an inner glass container and an internal surface of an outer glass container housing the inner glass container in the outer glass container with a gap formed in between;    integrally joining the inner glass container and the outer glass container;    heating the integrally joined inner glass container and outer glass container at a temperature of about 400° C. or higher in a non-oxidative environment for 10 minutes or longer to form a radiant heat preventive film.    
   
   
       12 . The manufacture method of  claim 9 , the non-oxidation environment is a vacuum environment, an environment filled with inactive gas, or an environment filled with inactive gas and hydrogen.  
   
   
       13 . The manufacture method of  claim 10 , the non-oxidation environment is a vacuum environment, an environment filled with inactive gas, or an environment filled with inactive gas and hydrogen.  
   
   
       14 . The manufacture method of  claim 11 , the non-oxidation environment is a vacuum environment, an environment filled with inactive gas, or an environment filled with inactive gas and hydrogen.