Gel-Based Lipstick Having Improved Rheology
AssigneeAvon Products, Inc.
InventorsSteven E. Brown, Arvind N. Shah
Life of this patent
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Abstract
Gel-based lipstick compositions are disclosed comprising an ester terminated poly(ester-amide) (ETPEA) polymeric gellant, a first wax component having a melting point above the sol-gel transition temperature of the ETPEA gellant, a second wax compositions having a melting point equal to of below the sol-gel transition temperature of the ETPEA gellant, optionally a silicone T-resin co-gellant, and one or more oils capable of forming a gel with the ETPEA gellant. The gel compositions are solid or semi-solid at room temperature and are capable of being molded into self-supporting sticks. The disclosed gels provide high gloss films when applied to the lips and/or provide a rheology characterized by a high viscosity over repeated shear cycles.
Claims21
-129. (canceled)
A method for imparting an unctuous film to the lips comprising applying thereto a composition comprising:
- (a) from 0.1 to 2.5% by weight of a copolymer or copolymers having an average molecular weight between 3,000 and 7,500 Daltons and being capable of forming a gel with low-polarity and nonpolar oils at or below a sol-gel transition temperature Tgel wherein Tgel is above body temperature;
- (b) from 5 to 12% by weight of a first wax component having a melting point above Tgel;
- wherein said first wax component equals or exceeds, on a weight basis, the amount of said copolymer or copolymers;
- (c) from 5 to 12% by weight of a second wax component having a melting point at or below Tgel;
- and
- (d) from 40 to 80% by weight of one or more low-polarity or nonpolar ester oils capable of forming a gel with said copolymer or copolymers at or below said sol-gel transition temperature Tgel;
- wherein the weight ratio of the copolymer or copolymers copolymer to the ester oils is less than 1:30;
- and wherein said ester oils comprise an oil selected from triisostearoyl polyglyceryl-3 dimer dilinoleate, diisopropyl dimerate, triisostearyl trilinoleate, C12-15 alcohols benzoate, octyldodecyl stearoyl stearate, diisostearyl fumarate, polyglyceryl-2 diisostearate/IPDI copolymer, and combinations thereof;
- wherein said composition is self-supporting at room temperature and is further characterized by a viscosity measured during a second shear cycle that is within ±20% of the viscosity measured during a first shear cycle at every shear rate between 1 and 10 sec−1, wherein said first and said second shear cycles are identical and comprise increasing shear rates from 1 to 1,000 sec−1.
The method of claim 1, wherein the copolymer or copolymers having an average molecular weight between 3,000 and 7,500 Daltons and being capable of forming a gel with low-polarity and nonpolar oils at or below a sol-gel transition temperature Tgel wherein Tgel is above body temperature is comprised of Bis-Stearyl Ethylenediamine/Neopentyl Glycol/Stearyl Hydrogenated Dimer Dilinoleate.
A method for imparting an unctuous film to the lips comprising applying thereto a composition comprising:
- (a) from 0.1 to 2.5% by weight of a copolymer or copolymers having an average molecular weight between 3,000 and 7,500 Daltons and being capable of forming a gel with low-polarity and nonpolar oils at or below a sol-gel transition temperature Tgel of 70° C. to 85° C.;
- (b) from 5 to 12% by weight of a first wax component having a melting point above Tgel;
- wherein said first wax component equals or exceeds, on a weight basis, the amount of Bis-Stearyl Ethylenediamine/Neopentyl Glycol/Stearyl Hydrogenated Dimer Dilinoleate copolymer;
- (c) from 5 to 12% by weight of a second wax component having a melting point at or below Tgel;
- and
- (d) from 40 to 80% by weight of one or more low-polarity or nonpolar ester oils capable of forming a gel with said ester terminated poly(ester-amide) polymer at or below said sol-gel transition temperature Tgel;
- wherein the weight ratio of Bis-Stearyl Ethylenediamine/Neopentyl Glycol/Stearyl Hydrogenated Dimer Dilinoleate copolymer to said ester oils is less than 1:30;
- wherein said ester oils comprise an oil selected from triisostearoyl polyglyceryl-3 dimer dilinoleate, diisopropyl dimerate, triisostearyl trilinoleate, C12-15 alcohols benzoate, octyldodecyl stearoyl stearate, diisostearyl fumarate, polyglyceryl-2 diisostearate/IPDI copolymer, and combinations thereof;
- wherein said composition is self-supporting at room temperature and is further characterized by a viscosity measured during a second shear cycle that is within ±20% of the viscosity measured during a first shear cycle at every shear rate between 1 and 10 sec−1, wherein said first and said second shear cycles are identical and comprise increasing shear rates from 1 to 1,000 sec−1;
- and wherein said composition is characterized by:
- (i) a viscosity greater than 100 Pa·sec at shear rates between 1 and 5 sec−1 when measured during said first and second shear cycles;
- and
- (ii) a viscosity greater than 10 Pa·sec at shear rates between 10 and 50 sec−1 when measured during said first and second shear cycles;
- and
- (iii) a viscosity greater than 1 Pa·sec at a shear rate of 100 sec−1 when measured during said first and second shear cycles.
Dependencies are inferred from the claim text.