Bleaching and dyeing; fluid treatment and chemical modification – Dyeing involving animal-derived natural fiber material ,... – Hair dyeing
Patent
1997-03-14
1999-03-09
Lieberman, Paul
Bleaching and dyeing; fluid treatment and chemical modification
Dyeing involving animal-derived natural fiber material ,...
Hair dyeing
8405, 8435, 8525, 8526, 8580, 8585, A61K 713
Patent
active
058794140
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 a period of time, perhaps up 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 considerable care and skill 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 in 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. This 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 has also previously been proposed to use stick formulations with a stearic acid base. These can however suffer from poor hardness characteristics if cooling of the final mix during production is not carefully controlled, as well as from a lack of stability of the hardness characteristic in relation to temporary exposure to higher temperatures e.g. if the stick composition is subjected to higher temperature in a salon window for some time causing it to soften, the stick fails to recover its original hardness when it cools down again and becomes somewhat brittle with pieces flaking off when the stick is drawn across a head of hair resulting in uneven dye application and increased risk of dye "spillage" onto the client's clothes or surrounding floor and furniture.
Another significant drawback of a stearic acid based product is that its relatively low pH--generally around pH 5 to 5.5--results in relatively poor penetration of the dye into the hair with the result the dye is more or less rapidly lost from the hair upon washing thereof. In addition because stearic acid is relatively insoluble in water, products based on it are on the one hand more difficult to apply to hair and on the other hand more difficult to wash out when the hair dyeing treatment has been completed, as well as being more difficult to produce in a fully homogenous form.
It is an object of the present invention to avoid or minimise one or more of the above disadvantages.
The present invention provides a solid wash resistant hair colourant stick composition comprising an intimate admixture of a wash resistant hair dye with a physiologically acceptable compatible solid base having a hardness which is sufficiently
REFERENCES:
patent: 313121 (1885-03-01), Stoltz
patent: 556726 (1896-03-01), Andersen
patent: 1055355 (1913-03-01), Richez
patent: 1139326 (1915-05-01), Barrington
patent: 2835604 (1958-05-01), Aronberg
patent: 4804385 (1989-02-01), Grollier et al.
Lieberman Paul
Liott Caroline D.
Solid Products Limited
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