Transparent glazing and its use in a door of a refrigerated enclosure, especially one having a vacuum glazing unit

Abstract

The subject of the invention is a transparent glazing unit having at least one viewing area and its use in a door of a refrigerated enclosure and more particularly a glazed door, the glazed area of which essentially consists of a vacuum glazing unit. According to the invention the viewing area is combined with an antifrosting absorbent layer deposited on at least one surface of the said area.

1 . A refrigerator door, comprising a metal door frame, a handle, a hinge, and an insulating glazing having at least one viewing area, said viewing area comprising an adsorbent porous layer comprising a hydrophilic polymer and an organic absorbent material, and having pores whose diameter is between 0.05 and 50 microns, said layer being deposited on at least one surface of said viewing area that comes in contact with a refrigerated environment when said door is assembled as part of a refrigerated enclosure, said layer preventing icing in the viewing area. 
   
   
       2 . The door enclosure according to  claim 1 , wherein the layer is deposited on the surface of the glazing. 
   
   
       3 . The door enclosure according to  claim 1 , wherein the layer is deposited on a plastic film fastened to the glazing. 
   
   
       4 . The door enclosure according to  claim 1 , wherein the hydrophilic polymer is crosslinked. 
   
   
       5 . The door enclosure according to  claim 1 , wherein the hydrophilic polymer is a polymer or copolymer of polyvinylpyrrolidone. 
   
   
       6 . The door enclosure according to  claim 1 , wherein the hydrophilic polymer is a polymer or copolymer of polyethylene glycol. 
   
   
       7 . The door enclosure according to  claim 1 , wherein the layer has a porosity of between 0.1 and 1000 cm 3 /g. 
   
   
       8 . The door enclosure according to  claim 1 , wherein the layer has pores whose diameter is between 0.1 and 20 microns. 
   
   
       9 . The door enclosure according to  claim 1 , wherein the layer has a porosity of between 0.1 and 1000 cm 3 /g and has pores whose diameter is between 0.1 and 20 microns. 
   
   
       10 . The door enclosure according to  claim 1 , wherein the layer has pores whose diameter is between 1 and 15 microns. 
   
   
       11 . The door enclosure according to  claim 1 , wherein the insulating glazing is a vacuum glazing unit. 
   
   
       12 . The door enclosure according to  claim 1 , wherein said hydrophilic polymer is selected from the group consisting of poly(N-vinyl-2-pyrrolidone), poly (1-vinylpyrrolidone), poly(N-vinyl-2-pyridine), poly(N-vinyl-3-pyridine), poly(N-vinyl-4-pyridine), poly(2-hydroxyethyl acrylate), poly (N′,N-hydroxyacrylamide), polyvinyl acetate, polyacrylonitrile, polyvinyl alcohol, polyacrolein, polyethylene glycol, polyoxyethylene, and copolymers based on two or more of these polymers. 
   
   
       13 . The door enclosure according to  claim 1 , wherein said adsorbent porous layer has a thickness of less than 100 microns.