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US3721597A Expired / Lapsed US ⏱️ 0.0 years remaining

Bonding metal laminae with thermoplastic film

Assignee: Dow Chemical Co
•
Filing: 1969-05-02
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Granted: 1973-03-20
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Expires: 1989-05-02
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Abstract

Abstract A laminate of two metal laminae is produced by disposing between two metal laminae a structured film comprising an inner layer of a thermoplastic material positioned between two layers of an adhesive thermoplastic material and applying heat and pressure to the metal laminae of sufficient magnitude to effect a bond between the adhesive layers and the metal laminae but of insufficient magnitude to destroy the integrity of the inner layer in the structured film. The inner thermoplastic layer in the structured film has a melting point at least about 25* F. greater than the melting point of the adhesive layers. In the practice of this method, metal laminae of aluminum strips can be bonded together with an adhesive thermoplastic such as a copolymer of ethylene and acrylic acid. The inner layer is fashioned of a material such as high density polyethylene. The laminate produced by this method is characterized by being free of metal-to-metal contact of the metal laminae. Laminates produced by this method have utility in a variety of fields including packaging and construction.

Inventors

  • 👤 L Colburn

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-26 18:20
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/04; B32B15/08; B32B15/14; B32B15/20; B32B7/00; B32B7/04; B32B7/12; B32B2323/00; B32B2323/04; B32B2323/043

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 20 words
A method according to claim 1 wherein said heat is applied to said metal laminae before said pressure is applied.
Claim 2
Dependent Claim 18 words
A method according to claim 1 wherein said heat and pressure are applied simultaneously to said metal laminae.
Claim 3
Dependent Claim 41 words
A method according to claim 1 wherein said heat and pressure are applied to said metal laminae by passing said metal laminae and said structured film to a bonding zone comprising the nip formed between a pair of opposed laminating rolls.
Claim 4
Dependent Claim 36 words
A method according to claim 1 wherein said heat and pressure are applied to said metal laminae by passing said metal laminae and said structured film to a bonding zone comprising the platens of a press.
Claim 5
Dependent Claim 72 words
A method according to claim 1 wherein said metal laminae are fashioned of a metal selected from the group consisting of aluminum, tin plated steel, stainless steel, steel, copper, magnesium, galvanized iron, terne plated steel, and tin; and said inner layer in said structured film is fashioned of a material selected from the group consisting of high density polyethylene, polypropylene, copolymers of ethylene and propylene, nylon 6, nylon 66, and chlorinated polyethylene.
Claim 6
Dependent Claim 82 words
A method according to claim 1 wherein said metal laminae are aluminum, said adhesive layers in said structured film comprise a copolymer containing about 92 weight percent combined ethylene and about 8 weight percent combined acrylic acid, said inner layer comprises high density polyethylene, and said pressure is applied by passing said metal laminae and said structured film into the nip formed between a pair of opposed laminating rolls, said rolls being at a temperature of between about 40* and about 1,000*F.
Claim 7
Dependent Claim 30 words
A method according to claim 1 wherein said inner layer in said structured film is in the form of a substantially continuous layer disposed between each of said adhesive layers.
Claim 8
Dependent Claim 39 words
A method according to claim 1 wherein said inner layer in said structured film is in the form of a fabric selected from the group consisting of woven fabrics and non-woven fabrics disposed between each of said adhesive layers.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1976-03-19 1976-09-18 1977-03-20 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-03-19 1980-09-18 1981-03-20 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-03-19 1984-09-18 1985-03-20 $7700.00 Window Closed / Lapsed

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