Heat insulating container having plastic walls retaining vacuum |
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| 申请号 | US30545172 | 申请日 | 1972-11-10 | 公开(公告)号 | US3828960A | 公开(公告)日 | 1974-08-13 |
| 申请人 | DOW CHEMICAL CO; | 发明人 | WALLES W; | ||||
| 摘要 | A container having a double wall construction of a structural plastic material is provided with improved thermal insulative properties by (1) metallizing at least one surface of each wall of the container with metal such as silver to provide a light reflective surface and to produce a partial barrier to atmospheric gases, (2) coating the metallized surface with a barrier plastic such as saran, (3) evacuating the space enclosed by the walls of the container, and (4) adding to the evacuated space a gas-absorbing material. | ||||||
| 权利要求 | 1. A plastic container having double wall construction capable of retaining a vacuum for a substantial period of time, said container comprising a boundary wall of a normally solid, plastic material enclosing an evacuated space, a layer of metal on at least one surface of said boundary wall, an overcoating of a barrier plastic adherent to the metal layer and a gas-absorbing material residing in the evacuated space. 2. The plastic container of claim 1 wherein the metal layer is on the surface of the boundary wall which is most proximate to the evacuated space. 3. The plastic container of claim 1 wherein the barrier plastic exhibits a permeance to gases of the atmosphere of less than about 0.9 cc/100 sq. in./mil/day. 4. The plastic container of claim 3 wherein the barrier plastic is a vinylidene chloride copolymer. 5. The plastic container of claim 1 wherein the metal is silver. 6. The plastic container of claim 1 wherein the thickness of the boundary wall is in the range from about 40 to about 300 mils, the thickness of the metal layer is in the range from about 0.0001 to about 0.5 mil and the thickness of the overcoating is in the range from about 0.001 to about 2.5 mils. 7. The plastic container of claim 1 wherein the gas-absorbing material comprises activated charcoal in the form of a particulate solid. 8. The plastic container according to claim 1 wherein the plastic material of the boundary wall is a polymer of a monovinylidene aromatic carbocyclic monomer. 9. A method for making the plastic container of claim 1 comprising the steps of rendering a surface of the boundary wall water wettable, depositing a metal on the water wettable surface to form an essentially continuous layer thereof, applying the barrier plastic in the form of a latex to the resulting metal layer to form an essentially continuous layer of the barrier plastic adherent to the metal layer, evacuating the enclosed space, adding a gas-absorbing material to the enclosed space and hermetically sealing the evacuated space from the atmosphere. 10. The method of claim 9 wherein the metal is deposited on a surface of the boundary wall by an electroless plating process. |
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