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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

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Filing Information

Inventor(s) Jean-Claude Arnaud · Pierre Bore ·
Assignee(s) L'Oreal ·
Attorney/Agent(s) Cushman, Darby & Cushman ·
Primary Examiner Charles Hart ·
Application Number US6817604
Filing date 01/10/1986
Issue date 02/10/1987
Predicted expiration date 01/10/2006
U.S. Classifications 436/5  · 436/119  ·
International Classifications G01N 3100  ·
Kind CodeA
International Classifications 4362;5;86;119;164;175;178 ·
Foreign Priority FR8500566 - 01/16/1985 ·
24 Claims, No Drawings


Abstract

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to produce an "uptake" of the compound on the fibres, which is a function of their surface state; (d) the specimen is withdrawn from the solution and the excess of solution saturating the fibres is removed; (e) the compound present on the fibres is extracted by immersing the latter in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.

Independent Claims | See all claims (24)

  1. 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.

References Cited

U.S. Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
US3992149 Calspan Corporation Wang Nov 1976
US4421859 L'Oreal Bore et al. Dec 1983

Foreign Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
SU1053003VNII MEKHOVOJ PROMYNov 1983

Referenced By

Document NumberAssigneeInventorsIssue/Pub Date
US5338494 Rockwell International Corporation Michael P. Ritter et al. Aug 1994

Patent Family

Document NumberAssigneeInventorsIssue/Pub Date
FR2576105 OREAL BORE PIERRE et al. Jul 1986
US4642294 L'Oreal Jean-Claude Arnaud et al. Feb 1987
ES550959 OREAL Apr 1987
ES8704346 OREAL Jun 1987
EP0193692 L'OREAL Jean-Claude Arnaud et al. Apr 1989
DE3569195 OREAL ARNAUD JEAN-CLAUDE et al. May 1989
CA1274758 OREAL ARNAUD JEAN-CLAUDE et al. Oct 1990