Method for substrate classification

Details Method for substrate classification Method for substrate classification

1997-08-05

1999-04-06

Alexander, Lyle A.

Chemistry: analytical and immunological testing

Process or composition for determination of physical state...

436174, 73 2341, G01N 700, G01N 3326

Patent

active

058917292

DESCRIPTION:

BRIEF SUMMARY
This application is the national phase of international application PCT/GB95/01118, filed May 18, 1995 which designated the U.S.


FIELD OF THE INVENTION

This invention relates to substrates and concerns a method of characterising substrates, particularly, but not exclusively, in relation to the behaviour of fragrances on substrates.


SUMMARY OF THE INVENTION

According to the invention there is provided a method of characterising a substrate by analysing properties of chemicals emanating from the substrate and/or from a substance applied to the substrate. The invention thus involves analysing the volatile chemical profile generated in the headspace over a substrate.
The properties of a substrate (including physical, chemical and microbiological properties) affect the behaviour of the substrate with respect to chemicals, particularly volatile chemicals, either naturally present in or on the substrate or in a substance applied thereto, and so affect the chemicals present in a headspace above the substrate. Accordingly, by analysing properties of chemicals emanating from the substrate (or a substance applied thereto) information can be obtained on the nature of the substrate which can be used to characterise the substrate.
The invention can be applied to a wide range of substrates, including, for example, skin, wood, hair, clothing, carpets, plastics surfaces, ceramic tiles, wool, fabric, perfumed products such as soap, detergents etc.
For example, human skin is conventionally characterised by reference to a number of descriptors including the following:
Such factors affect the behaviour of skin with respect to chemicals, so that skin can be characterised with reference to one or more of these factors, with complex, composite characterisations by reference to several factors being possible.
Having characterised a particular substrate by the method of the invention, eg. oily skin, ceramic tile, a particular detergent product etc, products (generally a fragrance or fragrance-containing product) having desired optimised properties particularly suited for use with that substrate can be determined. In this way products with optimum components and physical and chemical characteristics to perform within defined environments and conditions on a particular substrate can be developed. Selection of suitable products can be made by trial and error, with a degree of prediction being possible based on a knowledge of the performance of the substrate under consideration and also using convention formulation techniques. For example, it is known that certain cosmetic products are better suited to use on particular skin types. For fragrances or fragrance-containing products (eg skin, hair, fabric cleaning, hard surface cleaning products etc), it will generally be desirable to provide a long lasting perfume. For shampoos, high perfume impact during use is generally the desired objective. For malodour counteractancy products, effective malodour masking is the desired aim.
Examples of products that can be formulated in this way include, but are not limited to, fine fragrances, after-shaves, cosmetics, deodorants, soaps, shampoos, air-fresheners, furniture polishes, hard-surface cleaners, fabric-conditioners, laundry detergents, smooth washes, toothpastes, shower gels etc.
Having characterised a range of substrates, eg skin types, by use of the invention, an unknown substrate, eg skin of unknown type, can be classified by comparison with data for known types. This may then provide guidelines for the most appropriate treatment for that substrate.
The method of the invention may be applied to a substrate on its own, with analysis being made of chemicals naturally emanating from the substrate, or to a substrate to which a test formulation has been applied, with analysis being made of properties of chemicals emanating from both the substrate and the test formulation which are thus influenced by the interaction between the substrate and test formulation. For testing skin, for example, it would be suitable to use a test formulation co

REFERENCES:
patent: 5155045 (1992-10-01), Cutler et al.
patent: 5493890 (1996-02-01), Dussault et al.

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