CA2087983A1

CA2087983A1 - Laundry perfume carriage and delivery system

Info

Publication number: CA2087983A1
Application number: CA002087983A
Authority: CA
Inventors: Ariane M. M. Moyaert; Hugo J. M. Demeyere
Original assignee: Individual
Current assignee: Procter and Gamble Co
Priority date: 1990-07-31
Filing date: 1991-07-08
Publication date: 1992-02-01
Also published as: EP0469228A1; GR3019868T3; EP0469228B1; DE69026935T2; DK0469228T3; DE69026935D1; ATE137795T1; ES2087144T3; WO1992002605A1

Abstract

A perfume carriage and delivery system for laundry applications is provided. This system comprises perfume, a hydrophobic solid, a C8-C20 alcohol, or an ester thereof with a C2-C4 carboxylic acid, or mixtures thereof, and an amphiphile polymer.

Description

wo ?2/02605 2 0 8 7 9 8 3 Pcr/us9l/04731 ~ LA~DRY PERFUME CARRIAOE AND DELIVERY SYST~

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, , ~ Technical Field ~:;
The present invention relates to the general field of laundering. More specifically, this invention relates to ~, the delivery of perfume to fabrics which are washed or treated.
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: : Backqround The voluminous prior art relating to detergen~y in general and perfume delivery in particular shows that .
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208~9~3 numerous attempts have been made to design perfume carrier systems which would allow delivering the perfume to the fabrics; in these attempts, the main goal was to achieve delivery of undiluted, undissipated and unaltered perfume to the fabrics, so that the perfume would be released at the end of or after the laundry process.

One meth~d for achieving this goal is puttirg ~he perfume into a prcduct which goes directly into ~he dr~r.
This way, the perfume is delivered to the fabric i~ ~h~
dryer CyClQ. Such a methcd i5 taught in bo~h ~.S. ~a-el-4,511,49~, Melville, issued April 16, 1985, and U.S. Pat~n'.
4,636,330, Melville, issued January 13, 1987. Both teach forming perfume into partiGles with a carrier. These particles are hen formulated into a composition which is applied to te~-iles prior to putting into the dryer or :
prior to clothes-line drying.
~ ~ , An even more desirable method for delivering perfume of laundered fabric would be one which provides for protection of the perfume through the washing process and hence delivery of the perfume to fabric in essentially its ` original state.
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. , Such a method must allow for prevention of dilution, degradation or loss of the perfume during the wash cycle of the laundry process. This is done by utilizing a system that releases the perfume in the drying process or later after the perfume has been delivered to the fabric.
Preventing release of perfume durlng the washing process involves very different and more complex technology.

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VVO 92/02605 2 0 8 7 9 8 3 PCTtUS91/04731 One method which has been developed to provide thesebenefits is perfume microencapsulation. Here the perfume comprises a capsule core which is coated completely with a mat_rial which may be polymeric. U.S. Patent 4,145,184, Brain et al, issued March 20, 1979, and U.S. Patent 4,234,627, Schilling, issued November 18, 1980, teach using a tough coating material which essentially prohibits the diffusions out of the perfume. The perfume is delivered to fabric via the microcapsules and is then released by rupturo or t~e micr w apsules such as would occur with manipulation of the fabric. A problem with this methcd is that i~. takes a cer~ain amount of effort to break the micrGcapsules.

Another method involves providing protection of perfume ; through the wash cycle and release of perfume in the hea~-elevated conditions of the dryer. U.S. Patent ; 4,096,072, Brock et al, issued June 20, 1978, teaches a method for delivering fabric conditioning agents to textiles through the wash and dry cycle via particles containing hydrogenated caster oil and a fatty quaternary ammonium salt. Perfume may be incorporated into these particles.

All the above systems function quite well as far as the protection o~ the perfume is concerned; However, these systems do not achieve very well the delivery of perfume to fabrics because quite an amount of the microcapsules is waisted or lost during the wash process, for instance during the rinses.
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U.S. Patent 4,152,272, Young, issued May 1, 1979, partially addresses this problem in disclosing a perfume delivery system whereby delivery of perfume to the fabrics ~ .
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WO 92/0260~ PCT/US91/047~
2a879~3 4 _ is said to be enhanced. This patent teaches incorporating perfume into wax particles to protect the perfume through storage in dry compositions and enhance the deposition of the particles on the fabrics during the rinse by tho concommitant use of a cationic surfactant. The perfume then diffuses through the wax matrix of the particles on the fabric in the heat-elevated conditions of the dryer.
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This system is however limited in that it is said 'co be designed for use in a rinse mode only, i.e. it is not -- suitable for use in a through the wash mode.
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- It is an obj2ct of th2 pres2nt inv~ntion .o provid2 a perfume carriage and delivery system which is suitable for use in a "through the wash" mode, be it in a detergent ;~ composition or a fabric treatment composition, or as a lau.ndry additive. It is therefore an object of the present invention to provide a perfume carriage and delivery system which will protect the perfume before and during the wash, and which better deposits on fabrics.

Another object of the invention is to proYide a system which will gradually release the perfume over a long period I of time, after deposition on the fabrics and after the fabrics are dry.

Summary of the Invention , , It has now been found that the above objects are met when a perfure carriage and dellvery system is used which ~.

, 92/02605 _250 ~ 7 9 8 3 PCT/US91/04731 comprises (a) - from 20% to 80% of perfume;
(b) - from 5% to 50% of a hydrophobic solid having a m21ting point of ~rom 30~C to 120C;
(c) - from 5% to 50% of C8_20 branched on linear alcohol or esters thereof with C2_4 carboxylic acids.
td) - from 5% to 50% of an amphiphile polymer.
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The syst2m will protect the perfume and deliver it to Labrics wnen i' is used in a wash liquor which comprises clay.
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~etailed description ' The perfume ', ~ : ' ~ Any perfume can be used according to the present ~ .
invention; it can be relatively simple in its composition or can contain complex mixtures of natural and synthetic chemical compounds which are all chosen to provide any desirPd odor. Ther fore, in its broadest expression, a perfume suitable for use herein is any material which exudes a pleasant or otherwise desirable odor when it is appli d to fabrics. Some perfumes which are suitable for use in detergents or fabric treatment compositions are commercialIy available. Others are described for instance in S. Arctander, Perfume Flavors and Chemicals, Vols. I and II, Author, Montclair, N.J. and the Merck Index, 8th Edltion, Merck ~ Co., Inc. Rahway N.J.

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WO 92/0260~ PCT/US91!047~
æ~8~9~3 - 6 According to the present invention, the perfume will represent from 20% to 80% by weight of the total perfume carriage and delivery system (hereinafter referred to as the system). Preferably, the system contains from 40% to 60~ by weight of the system of perfume, preferably 50%.

The hydrophobic solid compound The system according to the present invention also comprises a nydrophobic solid compound which has a melting point of from about 30C to about 120 C. ~he meltiny point OI the hydrophobic compound influences the melting point or the system, and the melting point of the hydrophobic solid is to be adapted so that the system is solid at ambient temperature but liquid or fluid at wash temperature.
Accordingly, the man skilled in the art will need to adapt this parameter according to the climate and washing habits in a given country.

By hydrophobic, it i5 meant that the compound is insoluble in water but miscible with the perfume defined hereinabove. miS way, the compound will "protect" the perfume by retaining it in a hydrophobic environment.
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During the wash, the system will be in a fluid state, due to the warm temperature of the wash water. The system will then form an emulsion in the wash water and deposit on the fabrics, as explained hereinafter. When the rinse occurs, the hydrophobic compound, which still retains the perfume, will "freeze on the fabrics" because of the cold water which is used for rinsing; this way, a very thin layer of the system will be entangled in the fibres of the fabrics, which will not be removed by subsequent rinses.
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~v~ 92/02605 2 ~ 8 ~ 9 8 3 PCT/US91/04731 .

Herea-fter, the perfume will be slowly released from the fabrics by simple diffusion through the hydrophobic compo~nd; this difrusion will be more or less rapid depending on the proportion of hydrophobic solid to perfume. T~e syst2m can also be designed so as to release perfume from the fabrics even long after they have been washed or t eated.
~`~ The ~mG~nt of -the hydrophobic solid can ~hersfore be adapted ~y the man skillod in the art, keeping in mind that the higher -~e ar,ount or hydrophobic solid in the system, ~ the more the per ume is protected, but the less the system - disperses in the wash liGuor. When a high proportion of hydrophobic solid is used, a slow and durable release of the perfume is obtained. The amount of this hydrophobic solid compound in a system according to the present invehtion is from about 5% to 50% by weight of the system.
Preferred amounts are from 10% to 30% by weight of the system, preferably 15%.

Suitable compounds according to the above definition ; include waxy materials and fats. Such materials may be from mineral vegetal, animal or synthetic origin. Example include waxes from the petrochemical industry, polyethylene waxes, bees wax, vegetal wax, triglycerides and the like.
Highly pr~ferred are mineral waxes from the petrochemical industry.

with C2-C4 car~oxvlic acids ':

The system according to the invention also comprises a , , , .

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W O 92/02605 PC~r/US91/0473'~

2 a 8 7 9 8 3 - 8 -C8-c20 alcohol, or an ester thereof with a C2-C4 carboxylic acid, or mixtures thereof.
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Prefe~red compounds are tallow alcohol or myristyl - alcohol.

~ his compound is incorporated in the syst~n so as -to allow it ~o ~etter dlsperse in the wash water. Indeed, it has been obserYed that the incorporation or this compound in appropriate amounts allows the system to form an ; emulsion in the wash water upon agitation.

The higher the amount of this compound in the system, the better the dispersion of the syst~m in the wash water, but ~ore perfume is released in the wash water. In contrast, the lesser the amount of said compound in the system, the poorer the dispersion of the system in the wash water and less perfu~e is released in the wash water.

The above balance also depends on the amount of hydrophobic material (defined hereinabove) which is incorporatéd. Indeed, the hydrophobic material tends to protect the perfume but also tends not to disperse very well. It has been observed that the C8-C20 alcohol or ester thereof with C2-C4 carboxylic acid or mixtures thereof, are to be incorporated in amounts of from 5% to ~50% by weight of the total system, preferably from 5% to 25~ by weight, preferably 10~.

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20~7983 ~'~ 92/02605 PCT/US91/04731 _ g _ .
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The am~hiPhile ~olYmer ith r~e _hroe ty~os Of ingredients defined hereinabove, a syst2m is obtained which protects the perfume and disperses in tAe wash water. A fourth `~ essen~ial cc~oner.t is an amphiphile polymer which T~ill ~-~ promote che deposition OL- 'che dispersed system on the fabrics during ~1e w2sh, provided that the system is used ~ in a wash liquor wnich contains clay.
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Suitable polymers for such a purpose are amphiphile `~ ~
`- polymers derived from such monomers as ethylene oxide, terephtalate propylene oxide, acrylamide, acrylic acid and other polymers.

Particularly preferred are polyethylene oxide/
polypropylene oxide block copolymers commercially available under the trade name PLURONIC (R) from~B~SF.
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These polym2rs are incorporated herein in amounts from ~?: 5% to 50% by weight of the total system, preferably from 15% to 35% by weight, preferably 25%.
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Industrial a~lication .

e perfume carriage and dellvery system according to the present invention can be made by mixing together the required ingredients; It is preferred to mix the ;,...
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WO 92/02605 ~ PCTIUS9~/0473t~
2~8798~ - lo -hydrophobic solid together with the C8-C20 alcohol ar ester thereo, with a C2-C4 carboxylic acid, at a temperature above the melting point of the hydrophobic solid; ~he amphiphile polymer is then added, preferably at such a~temper2t11rQ.
, Since mos. perrum2s are qui'ce heat sensitive, it is prefe~_-d ~o a'lcw ~2 abova ~i~ture to cool down as much ~ as possi~le beEore ~he addition of the perfume.
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Once ~he~e steps are completed, the mixture can be left ~to completely cool down as such, so as to form a block; in a preferred embodiment however, the mixture will b_ pellitized.
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The perfume carriage and delivery system according to the present invention can be used in many different ways;
It can be used~as such as a laundry additive, for laundry detergent or other fabric treatment compositions which com2rise clay; Indeed, as mentioned hereinabove, the presence of clay in the wash liquor is key to a satisfying performance of the system according to the present invention. Clays ars conventionally used in the field of detergency, mainly for the purpose of providing softening benefits to fabrics; such clays typically are hectorites or montmorillonites and the like.

It can also be used in a granular detergent composition or a fabric treatment composition comprising clay, i.e. not as an additive anymore, but as an ingredient of a ~ composition.
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2~87983 ~v~ 92/02603 PCT/US91/04731 To allow more flexibility for the user, i.e. to allow the user to use any detergent or rabric treatment composition, including ~hose which do not comprise clay, it is a preferred embodiment oE the invention to coagglomerate the system with clay. This way, the system carries its "own" clay, and does not re~lirs any other elay supply from the detergent or rabric treatment compositions.
This agglomeration can '~9 mad3 by any agglomerating techniqus, and ~ese ar~ w211 l~.o~,~ to ~ m n s!~illed in the art.

In a highly prererred embcd ~lenc, che system according to the presen~ invention will not only be agglomerated with clay, but also wi~h a clay-flocculating pol~mer ~hich enhance the performance of the system. Suitable clay flocculating polymers are well known to the man skilled in ; the ait, and are described for instance in EP-A-0 299 575, EP 0 313 146 and EP 0 328 182.
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The invention is illustrated by the following examples.
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EXAMPLES
~ ' Exam~le 1 ' A system according to the present invention is prepared ~ by mixing together :
500 g of perfume 150 g of wax ex-TOTAL, cire 40-60; melting point 60C
~:~ 100 g of Tallow alcohol 250 g of polyethylene oxide/polypropylene oxide polymer (pluronic (R) PE 6800 from B~SF) ',~
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WO 92/02605 PCT/US91/04731~
79~3 The wax is heated to a temp~rature of about 70C, and the tallow alcohol is added while stirring; the polymer is then added, also while stirring. The mixture is then left to cool to a temperature of about 50~C, and the perfume is added. The mixture is then pellitized, and pellets of a system according to che invention are obtained which comprlse ~' 50~ pe~ a ,i2;~.
~ 10~ Talio~ alconol ;~ ` 25-s ~Ol~Q_ ~ Example 2 .
A'laundry additive comprising a system according to the present invention is obtained by mixing,635 g of clay (High CEC Ca Montmori~lonite) with 10 g of polyethylene oxide MW
300 000) (clay-flocculating polymer) in an EIRICH mixer.
200 g of the system of example 1 are then added under high shear mixing, ard 155 ml of ~ater are subsequently added.
A coagglomerate is then obtained comprising a system according to example 1.

Exam~le 3 A granular detergent composition is made which comprlses Inqredient Composition (~ by '~eight) C11_12 alkyl ~enzene sulfonate (Na) 6.5 Tallow alcohol sulfate (Na) 1.0 ; ' ' ' ' ' : ~ , , . -' ' ': ' ' ' .
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v~92/0260~ 2 0 8 7 9 ~ 3 PCT/US91/04731 .

Inqredient Com~osition (% by weight) Tallow alcohol ethoxylate (EOll) O.8 Hydrogenated Tallow fatty acid 1.0 Dodecyl trimethyl ammonium chloride 1.5 Distearyl methyl amine 3.0 Dodecyl dimethyl ~onium N-Oxide 0.4 Zeolite 20.0 Polyethylene oxide (~=S~M) 0.05 Sodium nitrilotiace~ate 5.0 Sodium sul~ate 12.7 Scdium silicate 2.0 Sodium perborate (4aq.) 18.0 Carboxymethylcellulose 0.4 Poly~crylate (mw 4000-5000) 3.0 Enzymes (protease, amylase, cellulase) 0.3 Optical brightener ~ 0.25 Sulphonated zinc phthalocyanine25ppm EDTA 0.2 Ethylenediamine tetramethylene phosphonic acid 0.1 Tetraacetyl ethylenediamine 1.5 Silicone/silica suds suppressor0.2 Montmorillonite clay 10.0 System of example 1 0.50 , , .
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Claims

1. A perfume carriage and delivery system which is suitable for use in a wash liquor comprising clay, characterized in that it comprises a mixture of (a) - from 20% to 80% of perfume;
(b) - from 5% to 50% of a hydrophobic solid having a melting point of from 30°C to 120°C;
(c) - from 5% to 50% of C8-20 branched on linear alcohol or esters thereof with C2-4 carboxylic acids;
(d) - from 5% to 50% of an amphiphile polymer.

2. A perfume carriage and delivery system according to claim 1, comprising - from 40% to 60% by weight of the system of component (a) - from 10% to 30% by weight of the system of component (b) - from 5% to 25% by weight of the system of component (c) - from 15% to 35% by weight of the system of component (d).

3. A perfume carriage and delivery system according to claim 2 comprising:
- 50% of component (a);
- 15% of component (b);
- 10% of component (c);
- 25% of component (d).

4. A perfume carriage and delivery system according to claim 1, 2 or 3 wherein component b is a wax of the petrochemical industry.

5. A perfume carriage and delivery system according to claim 1, 2 or 3 wherein component c is tallow alcohol.

6. A perfume carriage and delivery system according to claim 1, 2 or 3 wherein component d is selected from a polyacrylate, polystyrenesulphonate, polyacrylamide polyethyleneoxide and Block copolymers thereof with polyoxypropylene, polyethylene or polyamide.

7. A perfume carriage and delivery system according to claim 6 wherein said polymer is a Block copolymer or polyethylene oxide and polypropylene oxide.

8. A laundry additive which comprises a perfume carriage and delivery system according to claim 1 and clay.

9. A laundry additive according to claim 8 wherein the system and the clay are coagglomerated.

10. A laundry additive according to claim 8 or 9 which additionally comprises a clay flocculating polymer.

11. A granular detergent composition comprising conventional detensive ingredients, clay, and a perfume carriage and delivery system according to claim 1.

12. A through the wash softening composition comprising clay and a perfume carriage and delivery system according to claim 1.