END OF LIFE INDICATOR FOR TRANSPARENT GEL AIR FRESHENERS
Publication Date: 2003-Dec-08
The IP.com Prior Art Database
Gelled transparent air fresheners based on modified polyamides have very good performance properties as a linear release system for fragrances. The only drawback of the system is that the gel does not change its appearance, even when most of the fragrance has been released. In this disclosure the use of an additive is described which acts as an "end of life" indicator for gelled transparent air fresheners by turning the gel opaque when the fragrance has evaporated. The amount of additive is only a few percent of the total formulation and is readily incorporated into the air freshener during preparation. It does not require any additional procedures in making an air freshener with these modified polyamides.