Cosmetic products

Abstract

The photo-destruction of an ingredient that is susceptible to photo-destruction in a stick cosmetic product can be retarded by controlling the ingress of air through the base of the dispenser of that product. The invention is particularly suitable for antiperspirant compositions containing palmatine disposed within a bottom-fill dispenser.

1 . A cosmetic product which is a composition disposed with a dispenser, in which the composition is in the form of a solid anhydrous stick composition containing one or more ingredients that are susceptible to photo-destruction by visible/UV light and/or UV light and the dispenser comprises a barrel having opposed first and second ends, the first end being closed by a cap and the second end comprising a base, a platform intermediate between the first and second ends and screw-threaded means for advancing the platform towards the first end mounted on or adjacent to the second end, the composition being disposed between the platform and the first end of the barrel, in which the dispenser permits a % weight gain after 21 days in the test procedure as defined herein of not greater than 150% of the % weight gain obtained in the reference dispenser. 
   
   
       2 . A cosmetic product according to  claim 1  in which the ingredient that is susceptible to photo-destruction by visible/UV light is one or a mixture selected from:
 Molecules which produce singlet oxygen under exposure to light in the range 290-740 nm, preferably up to 700 nm and oxygen with a quantum yield greater than 0.05 in an organic solvent;   Molecules comprising aromatic heterocycles   Phenols which lack a tertiary butyl group that would serve to stabilise the phenol,   Biological molecules: Vitamins, Co-enzymes, Enzymes and proteins and Unsaturated aliphatic olefinically unsaturated fatty carboxylic acids   
   
   
       3 . A cosmetic product according to  claim 2  in which the ingredient that is susceptible to photo-destruction by visible/UV light is selected from:—
 Aromatic heterocylic compounds, comprising a nitrogen hetero atom and particularly when the hetero atom is charged,   Unsaturated aliphatic olefinically unsaturated fatty carboxylic acids comprising a C—H bond alpha to the olefinic unsaturation;   Phenols and polyphenols that are not sterically hindered and Vitamins.   
   
   
       4 . A cosmetic product according to  claim 1  in which the ingredient that is susceptible to photo-destruction by visible/UV light is one or more of palmatine, a C18 olefinically unsaturated carboxylic acid and a vitamin. 
   
   
       5 . A cosmetic product according to  claim 4  in which the ingredient that is susceptible to photo-destruction by visible/UV light is palmatine. 
   
   
       6 . A cosmetic product according to  claim 1  in which the ingredient that is susceptible to photo-destruction by visible/UV light is a dye. 
   
   
       7 . A cosmetic product according to  claim 1  in which the ingredient that is susceptible to photo-destruction by visible/UV light has a peak extinction coefficient in the visible/UV light spectrum of at least 100 mol −1 cm −1 . 
   
   
       8 . A cosmetic product according to  claim 7  in which the ingredient that is susceptible to photo-destruction by visible/UV light has a peak extinction coefficient in the visible/UV light spectrum of at least 500 mol −1 cm −1 . 
   
   
       9 . A cosmetic product according to  claim 7  in which the ingredient that is susceptible to photo-destruction by visible/UV light has a peak extinction coefficient in the visible/UV light spectrum of at least 1000 mol −1 cm −1 . 
   
   
       10 . A cosmetic product according to  claim 1  in which the ingredient that is susceptible to photo-destruction by visible/UV light is present at a concentration of at least 0.0001% by weight, and preferably at least 0.001% by weight of the stick composition. 
   
   
       11 . A composition according to  claim 10  in which the ingredient that is susceptible to photo-destruction by visible/UV light has a peak extinction coefficient in the visible/UV light spectrum of at least 500 mol −1 cm −1 . 
   
   
       12 . A cosmetic product according to  claim 1  in which the stick composition comprises an astringent antiperspirant salt. 
   
   
       13 . A cosmetic product according to  claim 12  in which the astringent salt is an aluminium and/or zirconium chlorohydrate, optionally complexed. 
   
   
       14 . A cosmetic product according to  claim 13  in which the astringent salt is an aluminium chlorohydrate. 
   
   
       15 . A cosmetic product according to  claim 13  in which the astringent salt is an aluminium zirconium chlorohydrate complexed with glycine. 
   
   
       16 . A cosmetic product according to  claim 1  in which the dispenser permits a % weight gain after 21 days in the test procedure as defined herein of not greater than 110% of the % weight gain obtained in the reference dispenser. 
   
   
       17 . A cosmetic product according to  claim 16  in which the dispenser contains an aluminium and/or zirconium chlorohydrate, optionally complexed, and the ingredient that is susceptible to photo-destruction by visible/UV light has a peak extinction coefficient in the visible/UV light spectrum of at least 500 mol −1 cm −1  and is present at a concentration of at least 0.0001% by weight of the stick composition. 
   
   
       18 . A cosmetic product according to  claim 16  in which the ingredient that is susceptible to photo-destruction by visible/UV light is palmatine. 
   
   
       19 . A cosmetic product according to  claim 1  in which the base of the dispenser defines a central aperture through which extends a rotatable mounting for a rotor on which is mounted a spindle to engage the platform, the mounting and base being spaced apart and bridged by two seals. 
   
   
       20 . A cosmetic product according to  claim 19  in which the mounting and base comprise opposed axially extending concentric walls that are bridged by one seal of the two seals that is an unbroken radial annular seal. 
   
   
       21 . A cosmetic product according to  claim 19  in which the mounting and the base comprises a radially-extending wall section, which wall sections are opposed, the wall section of the mounting being located axially below the wall section of the base, the wall sections being bridged by an unbroken axial seal. 
   
   
       22 . A cosmetic product according to  claim 19  in which the mounting and the base each comprises a radial wall section orthogonal to an axially extending wall, the respective radial walls being opposed, the mounting radial wall being located below the base radial wall and the respective axially extending walls being opposed and concentric, the mounting wall being located within the base axially extending wall, and an annular radial seal bridging the axially extending walls and an axial seal bridging the radial wall sections. 
   
   
       23 . A cosmetic product according to  claim 1  in which at least one of the seals is a claw seal. 
   
   
       24 . A cosmetic product according to  claim 1  in which the platform comprises at least one channel through which stick material can be charged into the dispenser between the platform and the first end.