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Air Freshener Gels

IP.com Disclosure Number: IPCOM000012134D
Publication Date: 2003-Apr-10

Publishing Venue

The IP.com Prior Art Database

Related People

Jerrrold Miller: AUTHOR [+2]

Abstract

A block copolymer of the formula hydrocarbon-polyether-polyamide-polyether-hydrocarbon is described which may be prepared by the reaction of reactants that include dimer acid, diamine, and a polyether having both hydrocarbon termination and termination selected from one of amine, hydroxyl and carboxyl. The copolymer is compatible with a wide variety of polar fragrances and liquids, and may be combined with these polar fragrances and liquids to form gels, where the gel may be transparent, of varying firmness, and may be incorporated into air fresheners.

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Air Freshener Gels

Abstract

A block copolymer of the formula hydrocarbon-polyether-polyamide-polyether-hydrocarbon is described which may be prepared by the reaction of reactants that include dimer acid, diamine, and a polyether having both hydrocarbon termination and termination selected from one of amine, hydroxyl and carboxyl.� The copolymer is compatible with a wide variety of polar fragrances and liquids, and may be combined with these polar fragrances and liquids to form gels, where the gel may be transparent, of varying firmness, and may be incorporated into air fresheners.

Introduction:

        � � � � � � � � � � � Although gel-type air fresheners are 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 commercially successful, it must provide the consumer with a pleasing scent which does not change dramatically over time, has an acceptable lifetime, and is released at a linear, controlled rate.� It must also have some 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.� 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.

        � � � � � � � � � � � Manufacturers of air fresheners place similar requirements on the gels to be used in air fresheners.� Obviously, the gel must be able to meet the above listed consumer requirements.� However, more specifically, manufacturers must be able to manufacture the gels at relatively low temperatures (below 120oC) due to the volatility of the fragrances, and desire gellants which are compatible with diluents and fragrances of varying polarity.� For example, there are gellants available which are capable of gelling non-polar diluents and fragrances to yield clear, semi-solid gels.� However, these gellants are sometimes less satisfactory when the fragrances are composed of more polar materials, in that they produce a gel that displays one or more of the properties of haziness, syneresis, or phase separation.� Some gellants can tolerate small loadings of polar fragrances but not larger ones.� Therefore, if a gellant is compatible with a wide range of polar liquids, there is an inherent benefit to the manufacturer.

        � � � � � � � � � � � We have found that hydrocarbon-terminated polyether-polyamide block copolymers (PAOPAs), as disclosed in U.S. Patent No. 6,399,713 to MacQueen and Pavlin, provide increased compatibility with polar fragrances while maintaining the characteristics required by the consumer.� An added benefit of PAOPAs is the higher softening point, as measured by standard dropping...