SCENT BOOSTER

Abstract

A scent boosting composition comprising both a liquid fragrance composition and a water-disintegrate particulate fragrance composition each of which is enclosed in separate compartments of a single water-soluble envelope, the particulate fragrance composition comprising a solid component and a fragrance component. The composition provides to washed fabrics in a washing machine, both an immediate fragrance and an enduring fragrance.

Claims

1. A scent boosting composition comprising a liquid fragrance composition and a water-disintegrable particulate fragrance composition enclosed in separate compartments of a single water-soluble envelope, wherein the water-disintegrable particulate fragrance composition comprises a solid component and a fragrance component.

2. The scent-boosting composition according to claim 1, wherein the solid component of the water-disintegrable particulate fragrance composition is completely water-soluble.

3. The scent-boosting composition according to claim 1, wherein the solid component of the water-disintegrable particulate fragrance composition comprises water-insoluble material.

4. The scent-boosting composition according to claim 1, wherein the particulate fragrance composition comprises microencapsulated fragrance.

5. The scent-boosting composition according to claim 3, wherein the particulate fragrance composition comprises a mixture of fragrance-containing microcapsules and a desiccating material.

6. The scent-boosting composition according to claim 5, wherein the desiccating material is silica.

7. A method of providing to fabrics in a wash liquor in a washing machine both an immediate fragrance and a long-lasting fragrance comprising adding to the wash liquor the scent-boosting composition according to claim 1.

8. The scent-boosting composition according to claim 1, wherein the water-disintegrable particulate fragrance composition is formed by spray drying.

9. The scent-boosting composition according to claim 1, wherein the fragrance component comprises at least one of free fragrance and microencapsulated fragrance.

10. The scent-boosting composition according to claim 9, wherein the fragrance component comprises both free fragrance and microencapsulated fragrance, and wherein the free fragrance and microencapsulated fragrance are the same or different.

11. The scent-boosting composition according to claim 1, wherein the liquid fragrance composition and the water-disintegrable particulate fragrance composition have the same or different fragrance.

12. The scent-boosting composition according to claim 1, wherein the liquid fragrance composition comprises at least one of a non-ionic surfactant and a fragrance dissolved or dispersed in a water-miscible, non-aqueous solvent.

13. The scent-boosting composition according to claim 12, wherein the solvent is at least one of dipropylene glycol, glycerol, propyl glycol, triacetin, and triethyl citrate.

14. The scent-boosting composition according to claim 1, wherein the water-soluble envelope comprises at least one of polyvinyl alcohol and gelatin.

15. The scent-boosting composition according to claim 1, wherein the water-disintegrable particulate fragrance composition is in the form of a powder.

16. The scent-boosting composition according to claim 4, wherein the microencapsulated fragrance is treated with at least one surface modifier.

17. The scent-boosting composition according to claim 16, wherein the surface modifier comprises non-ionic polysaccharides, glucan, glucomannan, xyloglucan, hydroxyalkyl cellulose, dextran, and galactomannan.

18. The scent-boosting composition according to claim 4, wherein the microencapsulated fragrance comprises biodegradable materials.

Description

EXAMPLE 1

[0026] This describes the preparation of a two-compartment envelope

(a) Preparation of Liquid Fragrance Composition.

[0027]

TABLE-US-00001 Formula A Formula B Liquid fragrance 16 12 Surfactant (Neodol ™ 91-8E) 8 6 Solvent, dipropylene glycol 76 82 Total 100 100

[0028] The fragrance was mixed with the surfactant The solvent was then added and mixed well.

(b) Preparation of Solid Fragrance Composition, Utilising Silica.

[0029] An aqueous slurry of fragrance-containing aminoplast microcapsules was prepared by the method described in International Publication WO 2008/098387. The slurry had a microcapsule weight solids content of 45%

[0030] The microcapsule slurry was sprayed on to silica, the mixture was mixed and sodium sulfate was then added and mixed well The weight proportions of components in the mixture were as shown in the following table

TABLE-US-00002 Ingredients Formula C Formula D microcapsule slurry 5 7.5 Silica (Sipernat ™ 22) 3 4.5 sodium sulphate 92.0 88.0 TOTAL AMOUNT 100.00 100.00

[0031] The components were mixed well and sieved with a 20 mesh sieve.

(c) Preparation of Solid Fragrance Composition, Utilising Starch

[0032]

TABLE-US-00003 Ingredients microcapsule slurry 10% Fragrance 10% Starch (Capsul ™) 10% Mannitol 20% Water 50%

[0033] Starch and mannitol were added to water at 60° C. to make a water phase. Fragrance was then added to this water phase and it was homogenized to make an emulsion. The microcapsule slurry was added to this emulsion and mixed well. The mixture was then spray-dried to form solid particles, using a GEA Niro Mobile Minor spray drier, with the following parameters:

[0034] The spray droplet size was to be between 0.5 and 2 μm (controlled by dynamic light scattering)

[0035] Inlet Temperature: 190° C.

[0036] Outlet Temperature: 90° C.

[0037] The result is a dry powder This powder was then mixed with sodium sulphate, sieved with a 20 mesh sieve.

TABLE-US-00004 Ingredients Formula E Spray-dried capsules in starch matrix(powder)  5% sodium sulphate 95%

(d) Preparation of Water-Soluble Envelope.

[0038] An envelope with two chambers was prepared by standard methods from poly(vinyl alcohol) film. The two chambers were loaded with combinations of ingredients, as shown in the following table.

TABLE-US-00005 Sample 1 Sample 2 Sample 3 Formula A 7.5 g 7.5 g Formula B 10 g Formula C 7.5 g Formula D  5 g Formula E 7.5 g Total  15 g  15 g 15 g

(e) Wash Test and Evaluation.

[0039] The envelope prepared in (d) was added to a top-loading washing machine with a standard washing load of 1 kg terry toweling and a cotton T-shirt. 20 g liquid detergent was added to a wash liquid of 25 L water. The wash cycle consisted of a room-temperature wash cycle and two rinse cycles. The toweling was allowed to dry on a washing line.

[0040] For comparison, the same wash and dry cycle was performed with the envelope being replaced by 15 g of a commercially-available scent booster (Downy™ Unstopable™ ex Procter & Gamble), known to contain fragrance-containing microcapsules. Two different varieties of this scent booster were tested.

[0041] The towelling and the T-shirt were evaluated by a panel of trained sensory evaluation experts who assessed the fragrance at the following points: [0042] Wash cycle finished, wet [0043] Washing line dried, before rubbing [0044] Washing line dried, after rubbing

[0045] Evaluation scale was on a 1-5 scale, as follows

[0046] 0—no fragrance intensity,

[0047] 1—very weak fragrance intensity,

[0048] 2—weak fragrance intensity,

[0049] 3—moderate fragrance intensity,

[0050] 4—strong intensity.

[0051] 5—very strong intensity

[0052] The following results were observed:

TABLE-US-00006 After Dry/ After Dry/ Before rub with rub Product Wet Towel Cloth Towel Cloth Downy ™ 4 2.5 2.5 3 3 Unstopable ™ Green Downy ™ 3.5 2 2.5 3 3 Unstopable ™, Rose Sample 1 4 2.5 3 3.5 4 Sample 2 4 2.5 3 3.5 4 Sample 3 4 2 3 3.5 4.

[0053] The fragrance booster prepared according to this description was found to be at least as effective as the highly-regarded commercial product, but was much more convenient in use.