Inorganic material in particles form

Details Inorganic material in particles form Inorganic material in particles form

1998-08-11

2000-12-26

Page, Thurman K.

Drug, bio-affecting and body treating compositions

Preparations characterized by special physical form

Particulate form

424401, A61K 914

Patent

active

061655104

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The present invention relates to an inorganic material in particles form useful in cosmetic compositions. The present invention most specifically relates to an exfoliating and/or massaging and/or cleansing material. The present invention also relates to a cosmetic composition containing said inorganic material.


BACKGROUND OF THE INVENTION

Exfoliation and cleansing of the skin is an essential element of body care. Exfoliating compositions are well known in the art. Such compositions may, by abrasion, remove residual make-up and dead cells from the surface of the skin in order to prevent pores clogging. This is achieved by abrasive particles suspended in said compositions.
In the past, two particulate abrasive materials were used; calcium carbonate and the endocarp of apricot seeds. It was recently recognized that these abrasive materials had an inherent grittiness and that it was desirable to produce an abrasive material which has an initial skin feel which would disappear while using the cosmetic formulation.
Thus, it has been disclosed in EP-A-670,712 an exfoliating composition including a particulate exfoliating material with a particle size in the range of 0.03 to 3mm, wherein the particulate material comprises an agglomerated silica having a primary particle size in the range of 0.01-0.2 microns, which is friable and under conditions of use of the composition break up into particles having an average size of less than 40 microns.
Only one type of silica agglomerate is disclosed in this document and it is described as an agglomerate of Sident 22S.
It is disclosed in this document that the inherent grittiness of the suspended abrasive particles is avoided. It is further disclosed that particles with average size of less than 40 microns do not feel gritty and that the average particle size, after break up of the exfoliating particles, will be less than 40 .mu.m.
Nevertheless, it has been found that, whilst the grittiness is reduced, the particles are still felt by the user as a residue on the skin.
A desirable feature following particle breakdown would be the perception by the user of a creamy smooth lather of the product on the skin and gentle cleansing. It has been found that the use of silica agglomerates as described in EP-A-670,712 did not give this effect because they do not fully breakdown and therefore do not contribute, by way of a thickening effect that smaller particles can provide, to the resultant lather.
There is therefore a need for exfoliating particles which, whilst providing the required exfoliating performance, progressively break down to a point at which they are no longer detected. It is also desirable for such exfoliating particles to give a creamy, smooth lather on breakdown in a cosmetic composition.
i) Oil Absorption (American Society Of Test Material Standards D, 281).
The test is based on the principle of mixing linseed oil with the silica by rubbing with a spatula on a smooth surface until a stiff putty-like paste is formed which will not break or separate when it is cut with a spatula. The volume of oil used is then put into the following equation: ##EQU1##
ii) Weight Mean Particle Size agglomeration is determined using a Malvern Mastersizer model X, made by Malvern Instruments, Malvern, Worcestershire with MS15 sample presentation unit. This instrument uses the principle of Fraunhoffer diffraction, utilising a low power He/Ne laser. The water insoluble particulates are dispersed ultrasonically in water for 7 minutes to form an aqueous suspension and then mechanically stirred before they are subjected to the measurement procedure outlined in the instruction manual for the instrument, utilising a 45 mm lens in the detector system. insoluble particulate. The weight mean particle size (d.sub.50) or 50 percentile, the 10 percentile (d.sub.10) and the 90 percentile (d.sub.90) are easily obtained from the data generated by the instrument.
iii) Granular Strength conditions. It is considered that this test is not representative of the conditions which prevai

REFERENCES:
patent: 4265899 (1981-05-01), Lewis et al.
Patent abstracts of Japan vol. 15, No. 293 (C-853), Jul. 25, 1991 and JP 03 106984 (Mitsubishi Kasei Corp.) May 7, 1991.

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