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 malodor in a washing machine at the end of a wash cycle, the method comprising adding a fragrance composition to a wash, the fragrance composition comprising at least two compounds selected from the group consisting of: a) ethyl (Z)-2-acetyl-4-methyltridec-2-enoate; b) ethyl N,S-bis(4-oxo-4-(2,6,6-trimethylcyclohex-3-en-1-yl) butan-2-yl) cysteinate; c) 4-(dodecylthio)-4-methylpentan-2-one; d) 1-butoxy-3-((1E,4Z)-hepta-1,4-dien-1-yl)benzene; and e) 2-ethoxy-4-((1E,4Z)-hepta-1,4-dien-1-yl) phenol.

2. The method according to claim 1, in which the at least two compounds are added in the form of a solution in a solvent.

3. The method according to claim 1, in which the at least two compounds are 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 at least two compunds are 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 the at least two compounds in the solution is from 10-80% by weight.

9. The method according to claim 2, in which the at least two compounds are added as part of a fragrance formulation.

Description

EXAMPLE: FRAGRANCE SUITABLE FOR FABRIC SOFTENER

(1) 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

(2) This accord was characterized as having a fresh, floral fruity character. This was designated Accord 1.

(3) 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.

(4) 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.

(5) 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.

(6) 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.

(7) 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).

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

(9) 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.