Process for preventing the degradation of water soluble packaging films by halogenated hydantoins or chlorinated cyanuric acid and apparatus for disinfecting a water system
US5851406A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 22, 1995 |
| Grant date | Dec 22, 1998 |
| Priority date | — |
| Expiry date | Nov 22, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F1/50
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A method to prevent the degradation of water soluble film placed in contact with halogenated hydantoin or chlorinated cyanuric acid and an apparatus for disinfecting water systems. Halogenated 5,5-dialkyl hydantoin or chlorinated cyanuric acid is combined with a stabilizing agent to prevent the halogenated hydantoin or chlorinated cyanuric acid from discoloring or degrading a polymeric film which it may contact. The oxidizing agent includes alkaline hydroxide, alkaline carbonates, alkaline bicarbonates, alkaline phosphates, alkaline silicates, and alkaline borates. Polymeric films for which this is suitable include 2-hydroxy propyl cellulose and poly(vinyl alcohol).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.