Method of inhibiting color change in a plastic article comprising silver-based antimicrobials
US6187456A · kind A · utility
13Cited by
7References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 9, 1999 |
| Grant date | Feb 13, 2001 |
| Priority date | — |
| Expiry date | Apr 9, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K3/015
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
This invention relates to improvements in inhibiting undesirable discoloring of plastic articles within which silver-based antimicrobials have been introduced. Such a method requires the utilization of very low amounts of acid scavengers or stabilizers such as aluminum-magnesium hydroxycarbonate, otherwise known as hydrotalcite (and not a zinc-based compound). Such hydrotalcites are very low in cost, easy to handle, and, utilized in very low levels in combination with a silver-based antimicrobial within a plastic composition, surprisingly substantially prohibits the generation of unwanted aesthetically displeasing colors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.