METHOD OF COUNTERING MALODOUR IN A WASHING MACHINE COMPRISING THE ADDITION OF A FRAGRANCE PRECURSOR

Abstract

A method of countering malodour in a washing machine at the end of a wash cycle, comprising the addition thereto of a fragrance precursor. The fragrance precursor may be added alone in solution, or as part of a fabric softener/conditioner. The precursor is particularly ethyl (Z)-2-acetyl-4-methyltridec-2-enoate; ethyl N,S-bis(4-oxo-4-(2,6,6-trimethylcyclohex-3-en-1-yl)butan-2-yl)cysteinate; 4-(dodecylthio)-4-methylpentan-2-one; 1-butoxy-3-((1E,4Z)-hepta-1,4-dien-1-yl)benzene; 2-ethoxy-4-((1E,4Z)-hepta-1,4-dien-1-yl)phenol; and mixtures thereof. The use of precursor in this manner provides a washing machine that is free from malodour for a prolonged period.

Claims

1. A method of countering malodour in a washing machine at the end of a wash cycle, comprising the addition thereto of at least two fragrance precursors selected from: ethyl (Z)-2-acetyl-4-methyltridec-2-enoate; ethyl N,S-bis(4-oxo-4-(2,6,6-trimethylcyclohex-3-en-1-yl)butan-2-yl)cysteinate; 4-(dodecylthio)-4-methylpentan-2-one; 1-butoxy-3-((1E,4Z)-hepta-1,4-dien-1-yl)benzene; and 2-ethoxy-4-((1E,4Z)-hepta-1,4-dien-1-yl)phenol.

2. The method according to claim 1, in which the fragrance precursor is added in the form of a solution in a solvent.

3. The method according to claim 1, in which the precursor is added as part of a fragrance formulation.

4. The method according to claim 3, in which the fragrance forms part of a fabric conditioner/softener formulation.

5. The method according to claim 1, in which the precursor is selected from the group consisting of a blend of ethyl (Z)-2-acetyl-4-methyltridec-2-enoate with ethyl N,S-bis(4-oxo-4-(2,6,6-trimethylcyclohex-3-en-1-yl)butan-2-yl)cysteinate.

6. The method according to claim 5, in which the weight ratio of ethyl (Z)-2-acetyl-4-methyltridec-2-enoate to ethyl N,S-bis(4-oxo-4-(2,6,6-trimethylcyclohex-3-en-1-yl)butan-2-yl)cysteinate is from 5:1 to 20:1.

7. The method according to claim 6, in which the weight ratio is from 8:1 to 10:1.

8. The method according to claim 2, in which the weight proportion of precursor in the solution is from 10-80% by weight.

9. The method according to claim 2, in which the precursor is added as part of a fragrance formulation.

Description

EXAMPLE: FRAGRANCE SUITABLE FOR FABRIC SOFTENER

[0028]

TABLE-US-00001 parts by weight Compound/Ingredient 1/1000 AGRUMEX (2-TERT-BUTYLCYCLOHEXYL ACETATE) 30 DODECANAL 2 2-METHYLUNDECANAL 1 AMBROFIX (3A,6,6,9A-TETRAMETHYL- 5 DODECAHYDRONAPHTHO[2,1-B]FURAN) BENZYL ACETATE 20 CASHMERAN (6,7-DIHYDRO-1,1,2,3,3-PENTAMETHYL- 10 4(5H)-INDANONE) CITRONELLOL 40 CYCLOGALBANATE (2-PROPENYL 5 (CYCLOHEXYLOXY)ACETATE) DAMASCONE DELTA (1-(2,6,6-TRIMETHYL-3- 10 CYCLOHEXEN-1-YL)-2-BUTEN-1-ONE) DIHYDRO MYRCENOL (2,6-DIMETHYL-7-OCTEN-2-OL) 80 ETHYL VANILLIN (3-ETHOXY-4- 15 HYDROXYBENZALDEHYDE) GARDENOL (1-PHENYLETHYL ACETATE) 5 GERANIOL (2-TRANS-3,7-DIMETHYL-2,6-OCTADIEN-1- 30 OL) GERANYL ACETATE (3,7-DIMETHYLOCTA-2,6-DIENYL 15 ACETATE) HEDIONE (METHYL 3-OXO-2- 60 PENTYLCYCLOPENTANEACETATE) HEXYL ACETATE 15 HEXYL CINNAMIC ALDEHYDE (2-HEXYL-3-PHENYL-2- 60 PROPENAL) HEXYL SALICYLATE (HEXYL 2-HYDROXYBENZOATE) 90 IONONE BETA (4-(2,6,6-TRIMETHYL-1-CYCLOHEXEN-1- 15 YL)-3-BUTEN-2-ONE) ISO E SUPER (2-ACETYL-1,2,3,4,5,6,7,8-OCTAHYDRO- 50 2,3,8,8-TETRA-METHYLNAPHTALENE JASMACYCLENE (3A,4,5,6,7,7A-HEXAHYDRO-4,7- 30 METHANO-1-INDEN-5(6)-YL ACETATE) JAVANOL.sup.1) 5 LAVANDIN GROSSO OIL 30 MANZANATE (ETHYL 2-METHYLPENTANOATE) 4 MEFROSOL (3-METHYL-5-PHENYL-1-PENTANOL) 30 METHYL ANTHRANILATE(METHYL 2- 5 AMINOBENZOATE) NEROLINE CRYSTALS (NAPHTALENE, 2-ETHOXY-) 15 NYMPHEAL (3-(4-ISOBUTYL-2- 20 METHYLPHENYL)PROPANAL) PATCHOULI OIL 10 PEACH PURE (4-UNDECANOLIDE) 15 PEONILE (2-CYCLOHEXYLIDENE-2- 40 PHENYLACETONITRILE) PETALIA (CYCLOHEXYLIDENE-O-TOLYL- 15 ACETONITRILE) PHENYL ETHYL ACETATE (2-PHENYLETHYL 5 ACETATE) PHENYL ETHYL ALCOHOL (2-PHENYLETHANOL) 40 RADJANOL.sup.2) 30 RASPBERRY KETONE (4-(4-HYDROXYPHENYL)-2- 5 BUTANONE) ROSE OXIDE (4-METHYL-2-(2-METHYL-1- 3 PROPENYL)TETRAHYDRO-2H-PYRAN) ROSYFOLIA ((1-METHYL-2-(5-METHYLHEX-4-EN-2- 10 YL)CYCLOPROPYL)METHANOL) TRICYCLAL (2,4-DIMETHYL-3-CYCLOHEXENE-1- 5 CARBALDEHYDE) UNDECAVERTOL (4-METHYL-3-DECEN-5-OL) 15 DIPROPYLENE GLYCOL 110 Total: 1000 .sup.1)Javanol = ((1-METHYL-2-(1,2,2-TRIMETHYLBICYCLO(3.1.0)-HEX-3-YLMETHYL)-CYCLOPROPYL)METHANOL) .sup.2)Radjanol = 2-ETHYL-4-(2,2,3-TRIMETHYL-3-CYCLOPENTEN-1-YL)-2-BUTEN-1-OL

[0029] This accord was characterized as having a fresh, floral fruity character. This was designated Accord 1.

[0030] A fragrance accord was created by replacing 70 parts of the DPG of this accord above by ethyl (Z)-2-acetyl-4-methyltridec-2-enoate. This was designated Accord 2.

[0031] A third accord was prepared by replacing the DPG completely with an equal amount of a blend of ethyl (Z)-2-acetyl-4-methyltridec-2-enoate (60 parts), ethyl N,S-bis(4-oxo-4-(2,6,6-trimethylcyclohex-3-en-1-yl)butan-2-yl)cysteinate (40 parts) and 4-(dodecylthio)-4-methylpentan-2-one (10 parts). This was designated Accord 3.

[0032] All of these accords were incorporated into samples of a fabric softener base at a dosage of 1.5% by weight, and each of these fabric softeners was then tested in the wash cycles described below. The fabric softener samples were prepared one day before testing.

[0033] In order to emulate the operation of a normal washing machine in everyday use, 11 washes were made with a washing load consisting of one towel and 4 T-shirts, two 5% polyester and two 100% polyester. The cycle was 38 minutes at 30? C. with a spin of 1200 rpm. 4 washes per day were performed. The machine door was left partially open for 1 hour before the next wash.

[0034] On the third day, when the washed had been completed, the odour in the machine was assessed by trained perfumers, who gave an assessment of the perfume odour on a scale of from 0 (no perfume odour) to 5 (very strong perfume odour).

[0035] The results, with tester comments, were as follows: [0036] Accord 1average score 1.75not very strong, less fresh, less powerful, less pleasant [0037] Accord 2average score 4more chypre, aldehydic, cleaner odour, stronger, more pleasant [0038] Accord 3average score 3floral, rosy, softer, original fragrance detectable.

[0039] The fabric softener with only ethyl (Z)-2-acetyl-4-methyltridec-2-enoate added to the fragrance gave the best results, not only from a durability standpoint, but also from an olfactory standpoint.