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US4642294: Process for evaluating the state of the surface of keratinous fibres and a composition for making use of this process
24 Claims, No Drawings
According to this process, (a) a compound capable of entering the surface interstices of the keratinous fibres is chosen; which is capable of producing, in an aqueous medium, a solution which is colored naturally or capable of being colored by a development, and capable, under the conditions of the process, of being stable and maintained at a pH such that no ionic charge appears; (b) an aqueous immersion solution containing the compounds chosen is prepared; (c) a specimen of the fibres to be studied is immersed therein to produce an "uptake" of the compound on the fibres, which is a function of their surface state; (d) the specimen is withdrawn from the solution and the excess of solution saturating the fibres is removed; (e) the compound present on the fibres is extracted by immersing the latter in at least one aqueous bath at the same pH as that of the aqueous immersion solution to obtain an extraction solution which is colored or whose color is developed in a step (f); and (g) the state of the surface of the fibres is deduced from the quantity of the compounds present in the extraction solution.
- 1. A process for evaluating the state of the surface of keratinous fibres, comprising the steps of:(a) selecting a compound having an overall spatial size equal to the maximum dimension of the interstices present at the surface of the keratinous fibres, said compound being capable of dissolving in an aqueous medium, to form a colored solution or a solution capable of being colored by a development, said compound also being stable under the conditions of application of the process, and capable of being maintained at a pH such that no ionic charge appears;(b) preparing an aqueous immersion solution containing said compound;(c) immersing a specimen of the keratinous fibres whose surface state is to be evaluated in said immersion solution to permit said fibres to "take up" an amount of said compound which amount is a function of the state of the surface of the latter;(d) withdrawing said specimen from said immersion solution and removing the excess of said immersion solution saturating the fibres by quick washing or dewatering;(e) extracting said compound from the said specimen by immersing said specimen in at least one aqueous bath whose pH is substantially identical to that of said immersion solution, to produce an extract solution which is correspondingly colored or capable of being colored by a development;(f) where necessary, developing the color of the extraction solution; and(g) deducing the state of the surface of said fibres from the quantity of said compound present in said extract solution.
U.S. Patent Documents
Foreign Patent Documents
|Document Number||Assignees||Inventors||Issue/Pub Date|
|SU1053003||VNII MEKHOVOJ PROMY||Nov 1983|