Bonding metal laminae with thermoplastic film
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
Claims Analysis
Total Claims: 8References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 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 |