Peelable laminated structures and process for production thereof
US5582884A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 1, 1994 |
| Grant date | Dec 10, 1996 |
| Priority date | — |
| Expiry date | Feb 1, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31688
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The invention provides a peelable laminated structure suitable for use in a peelable seal joining a flexible closure element (23) to a container (20) or in foil/polymer laminates used for packaging and the like. The structure comprises a porous-anodizable metal substrate (11) and a porous anodic film (12) overlying and attached to a surface of the substrate. The porous anodic film (12) has a weakened stratum (19) positioned between an outer film part and an underlying structure including the metal substrate (11). The weakened stratum (19) is strong enough in use of said structure to prevent detachment of the outer film part from the underlying structure, except by deliberate peeling of the flexible closure element (23). The invention also relates to a process for producing the structure and to peelable containers and recyclable laminates incorporating the structure. The structure provides a peeable interface which is not greatly dependent on the characteristics of particular adhesives or bonding techniques used to adhere the metal substrate (11) to the remaining structure, and is thus stable and reliable.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.