Patent EP0282015A2 successfully refreshed from Google Patents.
EP0282015A2
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Microwave interactive film, microwave interactive laminate and method for producing microwave interactive laminate
Assignee: Fort James Corp
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Filing: 1988-03-09
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Granted: —
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Expires: 2008-03-09
Abstract
Abstract In a microwave cooking heater element comprising a heat stable plastic film coated with a very thin layer of microwave interactive material to form a microwave interactive film, the improvement is provided which comprises the presence in said very thin layer of an inactivated area wherein the capability of said inactivated area to generate heat in response to microwave energy has been reduced by treatment with an inactivating chemical followed by drying. Furthermore, a microwave interactive laminate is provided which has been treated with an inactivating chemical, comprising said microwave interactive film and a substrate layer bonded to said microwave interactive film, wherein said very thin layer of microwave interactive material is between said heat stable plastic film and said substrate layer as well as a method for making such microwave interactive laminate.
Inventors
- 👤 David H. Hollenberg
- 👤 Leon Katz
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 22:42
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/10; B32B27/08; B32B7/00; B32B7/04; B32B7/12; B32B9/00; B32B9/005; B32B9/04; B32B9/045; B65; B65D; B65D81/00; B65D81/34; B65D81/3446; B32B2307/00; B32B2307/30; B32B2307/31; B32B2439/00; B32B2439/70; B65D2581/00; B65D2581/34; B65D2581/3437; B65D2581/3439; B65D2581/3447; B65D2581/3463; B65D2581/3464; B65D2581/3471; B65D2581/3472; B65D2581/3474; B65D2581/3477; B65D2581/3479; B65D2581/3486; B65D2581/3494
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
91 words
A microwave interactive film in a microwave cooking heater element comprising a heat stable plastic film coated with a very thin layer of microwave interactive material to form said microwave interactive film, characterized by the presence in said very thin layer (24) of an inactivated area (14) wherein the capability of said inactivated area to generate heat in response to microwave energy has been reduced by treatment with an inactivating chemical in an amount sufficient to prevent said inactivated area from generating heat in response to microwave energy, followed by drying.
Claim 2
Dependent Claim
91 words
A microwave interactive film in a microwave cooking heater element comprising a heat stable plastic film coated with a very thin layer of microwave interactive material to form said microwave interactive film, characterized by the presence in said very thin layer (24) of an inactivated area (14) wherein the capability of said inactivated area to generate heat in response to microwave energy has been reduced by treatment with an inactivating chemical in an amount sufficient to prevent said inactivated area from generating heat in response to microwave energy, followed by drying.
Claim 3
Dependent Claim
36 words
A microwave interactive film as defined in claim 1 wherein said microwave interactive material is selected from teh group consisting of iron, nickel, copper, silver, carbon, stainless steel, nichrome, magnetite, zinc, tin, tungsten, titanium and aluminum.
Claim 4
Dependent Claim
45 words
A microwave interactive film as defined in claim 1 or claim 2 wherein the inactivating chemical is selected from the group consisting of aqueous solutions of chelating agents, Zr⁺⁴salts, amines and hydroxyamines, dilute bases and dilute acids, aqueous solutions of metal salts, and mixtures thereof.
Claim 5
Dependent Claim
154 words
A microwave interactive film as defined in claim 3 wherein said chelating agents are selected from the group consisting of ethylenediaminetetracetic acid, diethylenetriaminepentacetic acid and hydroxyethylenediaminetriacetic acid; wherein said Zr⁺⁴salts are selected from the group consisting of ammonium zirconium carbonate, sodium zirconium lactate, ammonium zirconium lactate and zirconium tartrate; wherein said amines and hydroxyamines are selected from the group consisting of ethanolamine, diethanolamine, triethanolamine, choline and salts of the ethanolamines and choline; wherein said dilute bases are selected from the group consisting of potassium hydroxide, sodium hydroxide, lithium hydroxide, sodium and potassium carbonates and sodium and potassium phosphates; wherein said dilute acids are selected from the group consisting of acetic, formic, hydrochloric, hydrofluoric, citric, tartaric, oxalic and succinic acids and salts thereof; and wherein said metal salts are selected from the group consisting of ferric chloride, ferric sulphate, ferrous chloride, ferrous ammonium sulphate, ammonium fluoride, sodium fluoride, zinc chloride, zinc oxide and zinc fluoride.
Claim 6
Dependent Claim
62 words
A microwave interactive laminate comprising (a) a microwave interactive film (26) as defined in any of claims 1 to 4 and (b) a substrate layer (28) bonded to said microwave interactive film (26) to form a microwave interactive laminate (10), wherein said very thin layer (24) of microwave interactive material is between said heat stable plastic film (22) and said substrate layer.
Claim 7
Dependent Claim
26 words
A microwave interactive laminate as defined in claim 5 wherein said substrate layer (28) is selected from the group consisting of paperbord, papers and fiber/polymer composites.
Claim 8
Dependent Claim
39 words
A microwave interactive laminate as defined in claim 4 or claim 5 wherein said substrate layer is bonded to said microwave interactive film with an adhesive selected from the group consisting of water-based acrylic emulsions and casein neoprene emulsions.
Claim 9
Independent Claim
115 words
A method for making a microwave interactive laminate of any of claims 5 to 7 having a substrate layer and a microwave interactive film comprising: (a) depositing a very thin layer of microwave interactive material on one side of a heat stable plastic film; (b) treating a selected area of said very thin layer with an inactivating chemical in an amount sufficient to convert said selected area into an inactivated area with reduced capability of generating heat in response to microwave energy; and (c) bonding said microwave interactive film treated in accordance with step (b), to said substrate layer to place said very thin layer between said heat stable plastic film and said substrate layer.
Claim 10
Dependent Claim
28 words
A method as defined in claim 8 wherein said inactivating chemical is printed onto said very thin layer by a process selected from rotogravure, flexographic and lithographic techniques.
Claim 11
Dependent Claim
23 words
A method as defined in claim 9 wherein said inactivating chemical is printed onto said very thin layer with a flexographic printing technique.
Claim 12
Dependent Claim
27 words
A method defined in claim 10 wherein said microwave interactive film is bonded to said substrate layer in a continuous process in-line with said treating step (b).
Claim 13
Independent Claim
17 words
A method as defined in any of claims 8 to 11 wherein said inactivating includes a surfactant.
Claim 14
Dependent Claim
33 words
A method as defined in claim 12 wherein said surfactant is selected from the group consisting of TRITON X-100 R , KATAMUL 1G R , CERFAK 1400 R , and IGEPAL-CO630 R .
Claim 15
Dependent Claim
56 words
A container for the storage and microwave cooking of food, comprising: a package having a surface or surfaces for enclosing and/or supporting a food product, and a microwave interactive laminate (10) as defined in any of claims 5 to 7 bonded to said surface or surfaces to heat said food product in response to microwave energy.
Claim 16
Dependent Claim
22 words
A container as defined in claim 14 wherein said microwave interactive laminate (10) is bonded to interior vertical surfaces of said container.
Claim 17
Dependent Claim
27 words
A container as defined in claim 14 wherein said microwave interactive laminate (10) is bonded to a surface of said package which will support said food product.
Claim 18
Dependent Claim
28 words
A container as defined in claim 14 wherein said microwave interactive laminate (10) is bonded to a surface of said package which will be above said food product.
Claim 19
Dependent Claim
35 words
A container as defined in claim 14 wherein the inactivated areas (14) of the very thin layers (24) correspond to areas of said package wherein said very thin layers overlap when said package is assembled.
Claim 20
Dependent Claim
18 words
A container as defined in claim 14 wherein the heating area of the microwave interactive laminate is circular.
Claim 21
Dependent Claim
25 words
A container as defined in claim 14 wherein the heating area of the microwave interactive laminate is a grid of heating areas and inactivated areas.
References Cited (Backward Citations)
No citation records indexed.
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