Drug – bio-affecting and body treating compositions – Live hair or scalp treating compositions – Polymer containing
Patent
1996-09-25
1998-10-06
Kulkosky, Peter F.
Drug, bio-affecting and body treating compositions
Live hair or scalp treating compositions
Polymer containing
A61K 713
Patent
active
058173013
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to long-lasting hair dye compositions and in particular to the presentation of such compositions in solid stick form.
Conventional long-lasting hair dye compositions are generally presented in the form of a more or less thick liquid which is poured onto the hair mass, rubbed into the hair mass to distribute it through the hair mass, and then allowed to act on the hair for an extended period of time, perhaps 30 to 60 minutes depending on the dye and the temperature, to allow the dye to attach to the hair. In general the higher the temperature the shorter the time period required, thus the hair mass may, for example be covered over by a cap to trap body heat in it, or subjected to heating from a hot air blower. The residual composition is then washed out of the hair.
These known compositions are, however, somewhat awkward to apply and considerable care is required to avoid the dye running down the subject's head and possibly onto his/her clothes. Also care is required in order to obtain either a reasonably even distribution or a heavier application in specific sections of the hair mass for any desired special effect and/or to even out an existing unevenness in colouring.
It has also previously been proposed to provide pasty stick or slab compositions for dyeing hair which the dyestuff is encapsulated in micro-capsules to prevent deterioration thereof prior to use, the dyestuff being released by bursting of the micro-capsules by pressing the stick against the hair to be dyed. A problem with this approach is however that the effectiveness of the dye application depends on the successful bursting of the microcapsules which in turn depends on adequate pressure being exerted by pressing hard enough against the body underlying the hair mass to be dyed. A further problem is that the surface layer of the stick will retain a quantity of broken micro-capsules and the dye released therefrom which have not been transferred to the hair mass. The dyestuff is of course no longer protected against deterioration and the surface layer will then tend to undergo various undesirable changes dye to interaction of the stick base with the dye, interaction of dye and/or other different components released from different micro-capsules, and/or interaction of the contents of the micro-capsules with the atmosphere.
It is an object of the present invention to avoid or minimise one or more of the above disadvantages.
The present invention provides a long-lasting hair colourant stick composition comprising an intimate admixture of a direct dye with a physiologically acceptable compatible solid base having a hardness which is sufficiently high to provide substantial dimensional stability under light to moderate manual pressure under ambient temperatures and sufficiently low to allow easy gliding or the stick over a mass of damp hair and transfer of stick material thereto under light to moderate manual pressure, and containing a effective lathering component, whilst being substantially free of alkaline soap material.
It will be understood that the hardness of such a composition can be measured by various methods generally known in the part. Preferably the stick composition has a hardness in the range from 4 to 8 Newtons when measured by the following method. An Instron Universal Testing Instrument 1122 (normally used for testing the hardness of stick compositions such as lipstick) was employed with a steel probe having a diameter of 7 mm. The stick composition is placed in a holder and the probe advanced towards the stick at a rate of 50 mm/minute. When the probe tip contacts the surface of the stick composition it experiences a resistance to continued forward movement requiring the probe driving force to be increased. This force continues to increase to a peak when the probe breaks-through into the interior of the stick composition and this initial peak is used to provide a measure of the hardness of the stick composition.
As used herein the term "compatible" means that the solidifying medium should not have a
REFERENCES:
patent: 3683942 (1972-08-01), McKay
patent: 4147750 (1979-04-01), Geria et al.
patent: 4322400 (1982-03-01), Yuhas
patent: 4617185 (1986-10-01), DiPietro
patent: 4695452 (1987-09-01), Gannis et al.
patent: 5431906 (1995-07-01), Mohseni et al.
JP59021608, Patent Abstracts of Japan, vol. 8, No. 106 (C-223).
Kulkosky Peter F.
S Products Limited
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