Perfume compositions

Details Perfume compositions Perfume compositions

2002-08-29

2004-08-24

Warden, Jill (Department: 1743)

Perfume compositions

Perfume compositions

C510S101000

Reexamination Certificate

active

06780835

ABSTRACT:

This invention relates to perfumes, to laundry compositions containing such perfumes, and the use of these compositions to deposit perfume on fabrics.
The use of perfumes in laundry products has been established for many years. Perfume is used to cover base odour and to provide fragrance notes which are attractive or pleasing to the consumer. Generally, it is important that a perfume be able to perform well olfactively at a number of stages, for example, from product ‘in the pack’, during product use, on damp cloth after laundering and on dry cloth (i.e. after drying the damp cloth). Certain perfumes have the ability to provide deodorant action against body odour, either when directly applied to human skin, or when included in a laundry product. Such perfumes are described in EP-B-3172, U.S. Pat. Nos. 4,304,679, 4,278,658, 4,134,838, 4,288,341 and 4,289,641, 5,482,635 and 5,554,588.
It is important that sufficient fragrance should be transferred onto the fabric to be perceptible after laundering or (if the perfume has deodorant properties) to yield the deodorant effect.
A number of techniques have been proposed for increasing perfume delivery (to) and/or perfume longevity (on) substrates such as skin, hair, fabric and hard surfaces. This includes the use of fixative materials in the perfume to depress perfume ingredient partial pressures (eg GB 1534231) thereby reducing evaporative loss, and the use of carriers (eg EP 332259) or microcapsules (eg EP 376385) to deliver perfume to fabric. These technologies may increase perfume presence on dry cloth but involve further processing steps and/or material costs.
Compositions aiming to improve retention of “non-volatile” or “enduring” perfume ingredients, respectively, are disclosed in U.S. Pat. No. 5,500,138 and WO-A-97/31097.
At the present time, many garments are made from fabric which contains a mixture of fibres, a proportion of which are elastic, so that the fabric has the ability to stretch and to recover from stretch. Spandex fibres are commonly used for this purpose. The term “spandex” has been adopted as a generic term by the United States Federal Trade Commission to denote a manufactured fibre in which the fibre-forming substance is a long chain synthetic polymer composed of at least 85% of a segmented polyurethane. A discussion of such fibres can be found in “History of Spandex Elastomeric Fibres” by A. J. Ultee, which is a chapter starting at page 278 in
Man
-
Made Fibres: Their Origin and Development
, edited by R. V. Seymour and R. S. porter, Elsevier 1993. Spandex fibres are also referred to as “elastane” or “elasthane” fibres.
Another discussion of such fibres is found under the heading “Segmented Polyurethanes” at page 613 of
Handbook of Textile Fibres
by J. Gordon Cook, 5th Ed. Merrow Publishing Company 1984. Further description of elastanes and their applications can be found in “Synthesefasern: Grundlagen, Technologie, Verarbeitung und Anwendung”, B von Falkei (editor)
Verlag Chemie
(1991). Commercially available elastanes are well known, in particular as sold under the name LYCRA®, a registered trade mark of Dupont de Nemours and Company. Patents relating to such fibres include U.S. Pat. Nos. 5,000,899, 5,288,779 and 5,362,432.
SUMMARY OF THE INVENTION
We have now discovered certain perfumes which give good deposition and/or substantially improved deodorant effectiveness on textiles incorporating spandex fibres.
Broadly, the present invention provides a perfume composition comprising a mixture of fragrance materials in which at least 60% by weight of the composition comprises fragrance materials drawn from the two categories below:
Category I
hydroxylic materials which are alcohols, phenols or salicylates, with an octanol/water partition coefficient (P) whose common logarithm (log
10
P) is 2.5 or greater, and a gas chromatographic Kovats index (as determined on polydimethylsiloxane as non-polar stationary phase) lying within the range 1050 to 1600.
Category II
esters, ethers, ketones or aldehydes, with an octanol/water partition coefficient (P) whose common logarithm (log
10
P) is 2.5 or greater, and a gas chromatographic Kovats index (as determined on polydimethylsiloxane as non-polar stationary phase) lying within the range 1300 to 1600.
Particularly preferred are category I materials with a partition coefficient whose common logarithm is 3.0 or greater and a Kovats index of 1100 up to 1600, and category II materials which are ethers, esters, or ketones with a Kovats index of 1350 up to 1600, and possessing one or more rings in their molecular structures.
It is envisaged that the perfumes of this invention will be incorporated into a laundry or other composition for treatment of fabrics. This may be a detergent composition or presoak composition for washing the fabrics or a softening composition for softening the washed fabrics during rinsing and drying.
We have also discovered that the perfume may be incorporated into a composition used for treatment of yarn or new fabric, to provide a perfume benefit on new garments.
The benefit from the perfume compositions may be good deposition or retention of fragrance materials on the fabric. We have observed good deposition of a range of fragrance materials, especially fragrance materials which are of mid-range volatility (i.e. intermediate between the volatile perfume materials used as “top-notes” and the materials of low volatility which are customarily used as base notes in perfumes). These materials of mid-range volatility are often not perceptible on other fabrics such as cotton, polyamide and polyester after washing and drying.
Preferably, the perfume is a deodorant perfume giving a Malodour Reduction Value on cotton of at least 0.25, preferably at least 0.5, in the Malodour Reduction Value test described below and which is generally as given in EP-A-147191 and corresponding U.S. Pat. No. 4,663,068.
With such perfumes we have observed that there is an enhanced deodorant benefit when the fabrics incorporate spandex fibres, compared to conventional fabrics such as cotton, polyamide and polyester without spandex. This can be measured using the Malodour Reduction Value test, modified by varying the test fabric instead of varying the perfume.
The Malodour Reduction Value Test
In this test, the Malodour Reduction Value of a deodorant perfume is measured by assessing its effectiveness, when applied to fabric, in reducing body malodour when the fabric so treated is placed in contact with the axillae (armpits) of a panel of human subjects, and held there for a standard period of is time. From subsequent olfactory evaluation by trained assessors, a Malodour Reduction Value can be calculated so giving a measure of the effectiveness as a deodorant of the perfume under test.
Stage 1 is preparation of the perfume treated fabric.
A fabric is selected for the test and cut into 20 cm×20 cm squares. A control fabric is likewise cut into squares. Both fabrics are then washed in a front-loading drum-type washing machine with a standard unperfumed washing powder containing the following ingredients:
Ingredient
Parts by weight
Sodium dodecylbenzene sulphonate
9.0
C
13-15
alcohol 7EO
4.0
Sodium tripolyphosphate
33.0
Alkaline sodium silicate
6.0
Sodium carboxymethyl cellulose
1.0
Magnesium silicate
1.0
Ethylenediamine tetraacetic acid
0.2
Sodium sulphate
15.0
Water
10.8
The washed pieces of fabric are then rinsed with cold water and finally dried. The fabric squares so obtained represent “untreated” fabric, that is fabric devoid of perfume, other deodorant materials, dressing and other water-soluble substances that subsequently might adversely affect the Malodour Reduction Value Test.
The untreated pieces of fabric are divided into two batches, one of which may receive no further washing treatment and then represents the control fabric in the test. The other batch of fabric pieces is re-washed in the washing machine with the same standard fabric washing powder to which has been added 0.2% by weight of the perfume under test. The perfume treated pieces of fabric are then r

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