Easily-openable closure for seamed can
US4773558A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 25, 1987 |
| Grant date | Sep 27, 1988 |
| Priority date | — |
| Expiry date | Feb 25, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D17/4011
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An easily openable closure adapted to be fixed to a can body by seaming. The closure comprises a closure body of a rigid metallic material, a score formed therein reaching halfways in the thickness direction of the metallic closure body for defining a portion to be opened, and an opening tab provided near a score shearing starting point through a bonding support. The bonding support is comprised of a polyamide-type adhesive containing 6.1 to 15.0 main-chain carbon atoms on an average per amide group and having a crystallinity of 15 to 40% and a dynamic modulus, determined at a temperature of 25.degree. C. and a relative humidity of not more than 30%, of 0.8.times.10.sup.10 to 3.3.times.10 .sup.10 dynes/cm.sup.2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.