Compositions able to indicate when they become inefficient in use
US7033990B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 16, 2003 |
| Grant date | Apr 25, 2006 |
| Priority date | — |
| Expiry date | May 16, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N31/229
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention concerns a composition capable of indicating by color change when consumer articles, particularly volatile material dispensers, containing or associated with the composition have become inefficient in use. The composition includes: a) a volatile liquid component, b) a non-volatile component of an oxide or hydroxide of the metals of group III or IV of the periodic table and a polymer obtainable by the reaction, in the presence of the volatile liquid component, of a functionalized polymer with a cross-linking, and c) a dye capable of changing color as a function of the medium in which it is incorporated. Optionally, the composition can also contain an effective amount of an acidic compound. The invention also concerns the consumer article containing the composition, in particular a device aimed to diffuse a volatile or partially volatile liquid, more specifically an air freshener.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.