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END OF LIFE INDICATOR FOR TRANSPARENT GEL AIR FRESHENERS

IP.com Disclosure Number: IPCOM000020679D
Publication Date: 2003-Dec-08

Publishing Venue

The IP.com Prior Art Database

Related People

Erik Kelderman: AUTHOR

Abstract

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.

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TECHNICAL DISCLOSURE

END OF LIFE INDICATOR FOR TRANSPARENT GEL AIR FRESHENERS

ABSTRACT

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.

INTRODUCTION

Although gel-type air fresheners appear technically simple consumer products, there are a number of requirements that must be met to provide the consumer with a satisfactory product. For a gel-type air freshener to be successful, it must provide the consumer with a pleasing fragrance, which does not change dramatically over time, has an acceptable lifetime, and the fragrance is released at a linear, controlled rate. It must also have visual appeal, and it has been found that gels which exhibit good clarity and sharp, homogeneous coloring are desirable. In many cases, the ability to shape the gel into unique designs is beneficial, and once made, the gel must maintain its shape without substantial shrinking, sagging, hazing, bleeding (syneresis), or phase separating.

Manufacturers of air fresheners place similar requirements on the gels to be used in air fresheners. The gel must be able to meet the above listed consumer requirements. In addition, manufacturers must be able to make the gels at relatively low temperatures (below 120oC) due to the volatility of the fragrances, and desire gellants, must be compatible with diluents and fragrances. For example, there are gellants available which are capable of gelling non-polar diluents and fragrances to yield clear, semi-solid gels. Arizona Chemical produces these types of gellants, which are described in detail below. Optionally, it is beneficial for the air freshener to possess some sort of visual “end of life” indicator to indicate to the consumer that the fragrance has expired.

BACKGROUND FOR END OF LIFE INDICATORS

In the literature many technical solutions are presented as “end of life” indicators. Many of the technical solutions rely on a color change induced by a change in pH, polarity, etc. or diffusion speed through a layer, or shrinkage or a change from transparent to opaque or vice versa.

Polyamide-based gellant systems are visually attractive and transparent. In addition the air freshener is often artificially colored. Hence, color change is not a good indicator as to “end of life”. Polyamide-based gels also show small shrinkage upon evaporation of the fragrance and hence...