Merchandisers having anti-fog coatings and methods for making the same

a technology of anti-fog coating and merchandiser, which is applied in the direction of lighting and heating equipment, other chemical processes, domestic cooling equipment, etc., can solve the problems of obscuring the view of the product in the merchandiser, poor thermal insulation of glass and plastic, and condensation of moisture in the air spa

Inactive Publication Date: 2005-09-15
HUSSMANN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Glass and plastic are poor thermal insulators.
Moisture in the air space condenses on the cold glass (or fogs) and obscures viewing of the product in the merchandiser.
However, metal has two important drawbacks when used in reach-in-doors.
However, it will be noted that these attempts to reduce the metal used in the doors have not eliminated the metallic spacers, nor have they replaced the need for sealing glass lites before forming the frame.
The electrical conductivity of metal has also been a hindrance because in the past electrical power was commonly used to heat one or more surfaces of the glass lites in the door in order to prevent condensation from collecting and obscuring vision through the glass or plastic panes.
Also, when the door is opened, moisture condenses on the cold inside glass surface.
Without heating, this condensation would not clear quickly and so the view of the product in the merchandiser would be obscured.

Method used

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  • Merchandisers having anti-fog coatings and methods for making the same
  • Merchandisers having anti-fog coatings and methods for making the same
  • Merchandisers having anti-fog coatings and methods for making the same

Examples

Experimental program
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Effect test

example 1

[0121] To illustrate the preparation of an abrasion resistant anti-fog coating with a hydrophilic surface. Part A was mixed using simple mixing, namely, a magnetic stir bar and plate with Part B. Part A comprised about 28.1 grams Desmodur N-75 (Bayer) well mixed with about 21.9 grams of diacetone alcohol. Part B comprised about 37.8 grams of diacetone well mixed with about 11.0 grams PEG-90, 0.2 grams dibutyltin dilaurate, and DC-57 additive (Dow Corning). The mixture was immediately applied to a 4″ square of Lexan polycarbonate, via an airbrush. The mixture was then allowed to stand at ambient conditions for about 10 minutes. It was then baked for one hour at 125° C. The sample had excellent anti-fog properties when blown on. A 100-cycle taber abrasion test resulted in a haze of less than 5% using a dual, 500-gram load and a CS-10F abraser wheel. Note that the light transmittance of the coated sample exceeded the uncoated polycarbonate (approx. 92% before coating application). Sepa...

example 2

[0122] Part A was mixed with Part B using simple stirring, namely, a magnetic stir bar and plate to form the mixture. Part A comprised 28.1 grams of Desmodur N-75 (Bayer) well mixed with 21.9 grams of diacetone alcohol. Part B comprised 35.8 grams of diacetone well mixed with 13.9 grams of polyethylene glycol-180, 0.2 grams of dibutyl tin dilaurate, and 0.05 grams of DC-57 manufactured by Dow Corning. The mixture was immediately applied by flow-coating to a 4″ square of Teflon coated metal, and allowed to stand at ambient conditions for about 5-10 minutes. The cooled, cured film was peeled from the teflon surface and wrapped around a 0.5″ steel rod to observe the flexibility of the film. No crazing or marring was observed even after wrapping the cured film around itself multiple times. The film shows excellent anti-fog properties when blown on or exposed to changes in humidity and temperatures. Condensed water vapor reduces clarity after a few minutes of exposure. The film fills lig...

example 3

[0123] Example 3 illustrates the preparation of a water-repellant, anti-fog coating for low-temperature usage. In a 1-L beaker equipped with a magnetic stirrer and a heating mantle, about 200 grams Baxenden 7683 obtained by Baxenden was stirred with about 281 grams of diacetone alcohol to produce a solution of blocked polyisocyante in solvent. The solution was then heated to 60° C. To the heated, stirring solution was added a solution of 179 g of PEG-4600 in about 179 grams of diacetone alcohol. The solution was stirred and maintained at 60° C. for about 10 minutes. Then 1.6 grams each of dibutylyin dilaurated, and DC-57 additive (Dow Corning) were stirred in to produce a coating composition. The heated mixture was then applied to glass panels via flowcoating, and allowed to hang vertically at ambient conditions for 5 minutes. Samples were then baked for about 25 minutes at 150° C. Subsequently, the cooled, cured samples were exposed to −25° C. for 10 minutes, and then exposed to am...

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Abstract

A variety of refrigerators and merchandisers having glass or plastic substrates that are substantially fog-resistant are provided. For example, refrigerator doors having a substantially transparent substrate including an anti-fog coating on at least a portion thereof are provided. Many of the coatings exhibit color stable properties.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application is a continuation-in-part of U.S. application Ser. No. 10 / 341,525 filed Jan. 13, 2003, which claims the benefit of priority under 35 U.S.C. § 119(e) of U.S. provisional application No. 60 / 377,334 filed on May 2, 2002. The subject matter of these two applications is hereby fully incorporated by reference.BACKGROUND OF THE INVENTION [0002] Low temperature merchandisers for frozen foods are designed to maintain product temperatures in the display area less than about 0° C., and more particularly, less than or equal to about −15° C. for frozen food and below about −24° C. for ice cream, which in the past have required cooling coil temperatures in the range of about −24° C. down to about −37° C. Low temperature merchandisers are generally kept at temperatures less than about 0° C., and more particularly below −21° C. Medium temperature merchandisers maintain non-frozen food items, at temperatures generally in the range of ab...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A47F3/04C03C17/32C08G18/28C08G18/42C08G18/48C08G18/80C09D175/04
CPCA47F3/0434C03C17/322C08G18/283C08G18/4277C09D175/04C08G18/8074C08G18/8093C08G2290/00C08G18/4833A47F3/0404C09D175/08C09K3/18F25D23/028
Inventor ROCHE, JOHN M.MADIREDDI, SESHA C.BERNHEIM, EDWARD A.RAGLIN, BENJAMIN W.
Owner HUSSMANN CORP
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