Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Reexamination Certificate
2000-06-20
2002-07-23
Dees, Jose G. (Department: 1616)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
C424S064000, C424S078030
Reexamination Certificate
active
06423324
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention generally relates to temperature-stable polyamide resin-based compositions, and, more specifically, to translucent or transparent, temperature-stable, polyamide resin-based compounds for use in cosmetics, particularly in lipstick, lip gloss, and lip balm products.
2. Brief Description of Related Technology
The structure of conventional lipsticks is provided by a mixture of solid, semi-solid, and liquid lipids, such as waxes and emollients. Waxes are typically used to suspend or co-solubilize oils into a single-phase, solid structure. Conventional lipsticks are opaque.
In another type of lipstick composition, the structure is provided by a solid polyamide resin. Such a lipstick is disclosed in Strianse et al. U.S. Pat. No. 3,148,125 (Sep. 8, 1964), the disclosure of which is hereby incorporated herein by reference. The resin is a solid, but soluble, condensation product of an aliphatic dicarboxylic acid and a diamine. The polyamide resin is compounded with solvents, such as lower aliphatic alcohols and fatty acid esters, which act as softening agents. A lipstick containing a polyamide resin can be made optically clear (i.e., translucent or transparent) through a proper selection of suitable solvents. Generally, the amounts and types of solvents also are selected to provide a structure that is sufficiently strong and stable to permit its use as an applicator, and yet is capable of rubbing off onto the lips as a film (“ruboff”).
The polyamide resin-based lipstick disclosed in U.S. Pat. No. 3,148,125 can be prone to syneresis, a phenomenon in which, at an elevated temperature, components including oils in the composition migrate out of (are exuded out of) the resin network, accumulate on the surface of the composition and, in severe cases, flow away from the composition. In a prior art lipstick, even after the temperature is lowered, the exuded components remain outside of the resin network or flow from the composition. The resulting network is left harder and less capable or incapable of ruboff, thus irreparably damaging the product. The '125 patent discloses that syneresis is controlled by the use of anhydrous lower aliphatic alcohols, in an amount from two to ten percent. Over time, however, volatile anhydrous lower aliphatic alcohols evaporate from the composition, leaving a harder composition that is less capable of rubbing off onto the lips as a film and also which is prone to syneresis. The use of volatile alcohols also contributes undesirable taste and smell components to the product.
While it is known to use specialized packaging for storage and shipping of volatile alcohol-containing lipsticks, and specialized containers for intermittent storage between periods of use to inhibit alcohol evaporation, these measures introduce materials and costs not otherwise necessary in typical lipstick products. Moreover, the use of specialized containers does not prevent evaporation of the volatile anhydrous lower aliphatic alcohols, but only retards the rate of evaporation and extends the period of time over which the lipstick product gradually becomes harder and less capable of ruboff. Similarly, while it is known to use flavor and scent additives to counteract the undesirable taste and smell of volatile alcohol, these additives merely mask, rather than eliminate, the taste and smell of the volatile alcohol.
Accordingly, it would be desirable to provide an optically clear polyamide resin-based composition that is not irreparably damaged by the effects of syneresis. It also would be desirable to provide an optically clear polyamide resin-based lipstick composition that does not require specialized packaging and storage containers to inhibit hardening and loss of ruboff ability.
SUMMARY OF THE INVENTION
It is an objective of the invention to overcome one or more of the problems described above.
Accordingly, one aspect of the invention is to provide a temperature-stable cosmetic composition including a polyamide resin, a solvent for the polyamide resin, and a gelling agent selected from the group consisting of N-acyl amino acid amides, N-acyl amino acid esters, and mixtures thereof, wherein the composition is translucent or transparent.
Another aspect of the invention is to provide a temperature- stable cosmetic composition that is essentially free of volatile alcohols.
Still another aspect of the invention is to provide a temperature-stable cosmetic composition including about 3 wt. % to about 15 wt. % of a polyamide resin; about 10 wt. % to about 40 wt. % of liquid castor oil; about 35 wt. % to about 45 wt. % of isoeicosane; about 1 wt. % to about 10 wt. % of polybutene; and about 0.1 wt. % to about 20 wt. % of a gelling agent having the formula:
wherein R
1
is an alkyl, aryl, aralkyl radical having from about 6 to about 22 carbon atoms, and R
2
and R
3
, independently, are an alkyl, aryl, aralkyl ester radical or amide radical in which the alkyl, aryl, aralkyl moiety has from about 2 to about 20 carbon atoms.
The compositions of the invention can be translucent or transparent, do not require specialized packaging or containers, are not subject to hardening caused by evaporation of volatile alcohols, are temperature-stable over a period of at least several weeks, and exhibit excellent esthetic and functional properties, including sensory properties, for consumer acceptance.
The invention also relates to temperature-stable compositions comprising an oil-soluble topically-active compound, such as an anti-inflammatory agent, and having the advantages of the invention. Such compositions further comprise a polyamide resin, a solid for the polyamide resin, a gelling agent selected from the group consisting of N-acyl amino acid amides, N-acyl amino acid esters, and mixtures thereof Such compositions can also be made translucent or transparent.
Further aspects and advantages of the invention may become apparent to those skilled in the art from a review of the following detailed description, taken in conjunction with the appended claims. While the invention is susceptible of embodiments in various forms, described hereinafter are specific embodiments of the invention with the understanding that the disclosure is illustrative, and is not intended to limit the invention to the specific embodiments described herein.
DETAILED DESCRIPTION OF THE INVENTION
A temperature-stable cosmetic composition of the invention includes a polyamide resin, a solvent for the polyamide resin, and a gelling agent selected from the group consisting of an N-acyl amino acid amide, an N-acyl amino acid ester, and mixtures thereof, wherein the composition is translucent or transparent. Preferably, the composition is essentially free of volatile alcohols, which eliminates the need for specialized packaging and containers for the composition, eliminates hardening of the composition caused by evaporation of volatile alcohols, and eliminates undesirable flavor and fragrance components.
When used as a lipstick, lip gloss, or lip balm product, the composition of the invention preferably is made from ingredients that have been approved for incidental ingestion.
The following detailed description generally illustrates lipstick compositions. However, in addition to the lipstick compositions, topically-effective compositions including an oil-soluble, topically-active compound; a polyamide resin; a solvent for the polyamide resin; and a gelling agent selected from the group consisting of N-acyl amino acid amides, N-acyl amino acid esters, and mixtures thereof, also demonstrate the improved attributes of the composition, including translucence or transparency and temperature-stability. Exemplary topically-effective compounds include topically-active drugs and medicaments, topical esthetics, additional skin-soothing emollients and other topical cosmetic compounds, topical anti-inflammatories, and the like. The invention also relates to such topically-effective compositions.
Various abbreviations used herein are defined as follows: ° C. is degree centigrade; a
Cunningham John
Murphy John
Sanders Angie
Cosmolab Inc.
Dees Jos,e G.
Marshall Gerstein & Borun
Williamson Michael A.
LandOfFree
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