Laminated draw-formed container having excellent flavor-retentivity and shock resistance
US5653357A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 13, 1994 |
| Grant date | Aug 5, 1997 |
| Priority date | — |
| Expiry date | Oct 13, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB32B2439/02
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A laminated draw-formed container that is obtained by draw-forming a laminated material of a metal plate on which a resin film is laminated into a cup having bottom, wherein said resin film comprises a surface layer of a high molecular oriented copolymerized polyester derived from acid components of 85 to 97% of terephthalic acid and 3 to 15% of isophthalic acid, and a diol component, and a lower layer of a low molecular oriented copolymerized polyester (B) derived from acid components of 84.5 to 96.5% of terephthalic acid and 3.5 to 15.5% of isophthalic acid, the amount of the isophthalic acid being larger than that of the copolymerized polyester (A) of the surface layer, and a diol component, and said surface layer having a double refraction method orientation degree (.DELTA. n) as represented by the following relation, EQU .DELTA. n=n.sub.1 -n.sub.2 PA1 wherein n.sub.1 is a refractive index in the direction of a maximum orientation of the film, and n.sub.2 is a refractive index in the direction of thickness of the film, which is not smaller than 0.02. The laminated draw-formed container exhibits markedly improved dent resistance and corrosion resistance even after the container …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.