Treatment of the interior surfaces of resinous enclosure members
US4775587A · kind A · utility
12Cited by
6References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 30, 1986 |
| Grant date | Oct 4, 1988 |
| Priority date | — |
| Expiry date | May 30, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24999
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Plastic containers are treated to provide increased barrier properties to organics and gases such as oxygen by treating the interior surface of the container with SO.sub.3 gas. The SO.sub.3 gas is provided by inserting a solid pellet of poly-SO.sub.3 into the container and evaporating the SO.sub.3 such as with microwave energy. A solid neutralizing agent such as ammonium carbonate is then placed into the container and evaporated with microwave energy to form ammonia which neutralizes the sulfonic acid groups on the surface interior of the container.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.