Polypropylene multi-layer sealant films for retort packaging
US6663940B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 14, 2001 |
| Grant date | Dec 16, 2003 |
| Priority date | — |
| Expiry date | Dec 14, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31913
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Polypropylene multi-layer sealant films for retort packaging, each including a multi-layer film composed mainly of at least one polypropylene polymer and to be laminated on one surface of a heat-resisting film, the multi-layer film having a first surface facing the heat-resisting film when laminated therewith and further having a second surface on the other side, the first surface having a surface roughness as defined below in (1), and the second surface having a surface roughness as defined below in (2):(1)(i) center-line mean roughness (Ra): 0.020 to 0.250 &mgr;m;(ii) maximum height (Rmax): 0.3 to 2.9 &mgr;m; and(iii) ten-point mean roughness (Rz): 0.2 to 2.4 &mgr;m;(2)(i) center-line mean roughness (Ra): 0.050 to 0.300 &mgr;m;(ii) maximum height (Rmax): 3.0 to 13.0 &mgr;m; and(iii) ten-point mean roughness (Rz): 2.5 to 11.5 &mgr;m.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.