ACTIVE SUBSTANCE WAFER

Abstract

The present invention relates to an active substance wafer and methods for producing such an active substance wafer. Further, the present invention relates to the use of such an active substance wafer as/in a laundry care agent, a hand laundry washing agent or a dishwashing agent and to a product selected from these agents consisting or comprising an active substance wafer.

Claims

1. An active substance wafer comprising: (a) 1.0 to 50.0 parts by weight of a water-soluble polyvinyl alcohol, (b) 1.0 to 60.0 parts by weight of an active substance, (c) 0 to 5.0 parts by weight of a water-insoluble polymer, and (d) 0 to 10.0 parts by weight of an additive, wherein the parts by weight are based on the total weight of the active substance wafer.

2. The active substance wafer according to claim 1, wherein the active substance of (b) is selected from the group consisting of a fragrance, a cleaning-active and/or protecting substance, a functional agent, and a combination thereof.

3. The active substance wafer of claim 1, wherein the additive substance of (b) is selected from the group consisting of a filler, a disintegrant, a binder, an absorber, an antimicrobial, a dye, and a combination thereof.

4. The active substance wafer according to claim 1 comprising 3 to 12 parts by weight of the water-soluble polyvinyl alcohol.

5. The active substance wafer according to claim 1 comprising 5 to 15 parts by weight of the active substance of (b).

6. The active substance wafer according to claim 1 comprising: (a) 5 to 10 parts by weight of water-soluble polyvinyl alcohol, (b) 7 to 15 parts by weight of an active substance, wherein the active substance is a fragrance, (e) optionally, 2 to 5 parts by weight of starch, and (f) optionally, 1 to 8 parts by weight of the additive are contained.

7. The active substance wafer according to claim 1, wherein the water-soluble polyvinyl alcohol has an average degree of hydrolysis of 65 to 99.99 Mol %.

8. A method for production of an active substance wafer comprising: providing a substrate material, adding a mixture to the substrate material, drying of the mixture under formation of a first layer, and detaching the layer from the substrate material, wherein the mixture comprises: (a) 1.0 to 50.0 parts by weight of a water-soluble polyvinyl alcohol, (b) 1.0 to 60.0 parts by weight of an active substance, (c) 0 to 5.0 parts by weight of a water-insoluble polymer, and (d) 0 to 10.0 parts by weight of an additive.

9. The method according to claim 8, wherein the mixture comprises a solvent, wherein the water-soluble polyvinyl alcohol is dissolved in the solvent.

10. The method according to claim 9, wherein the solvent is applied at a temperature of 20 to 75 C.

11. The method according to claim 8, wherein after the formation of the first layer, a second layer is applied and dried to the first layer.

12. The method according to claim 8, wherein the active substrate comprises a material is selected from the group consisting of metal, plastic, glass, and a combination thereof.

13. An active substance wafer produced by the method according to claim 8.

14. A mixture for production of an active substance wafer, the mixture comprising: (a) 1.0 to 50.0 wt.-% of a water-soluble polyvinyl alcohol, (b) 1.0 to 60.0 wt.-% of an active substance, (c) 0 to 5.0 wt.-% of a water-insoluble polymer, (d) 0 to 10.0 wt.-% of an additive, and (e) 45.0 to 97.0 wt.-% of a solvent, wherein the weight percentage is based on the total weight of the mixture.

15. The mixture according to claim 14, wherein the solvent comprises; 30 to 70 wt.-% of water and 30 to 70 wt.-% of ethanol, based on the total weight of the solvent.

16. (canceled)

17. (canceled)

18. The active substance wafer according to claim 1, wherein the active substance of (b) is in an encapsulated form.

19. The active substance wafer according to claim 7, wherein the wherein the water-soluble polyvinyl alcohol has an average degree of hydrolysis of 75 to 95 Mol %.

20. The active substance wafer according to claim 9, wherein the solvent comprises 30 to 70 wt.-% of water and 30 to 70 wt.-% of ethanol, based on the total weight of the solvent.

21. The method of claim 12, wherein the active substrate is coated with melanin.

22. A product comprising the active substance wafer of claim 1, wherein the product is in the form of a laundry care agent, a hand laundry washing agent, or a dishwashing agent.

Description

EXAMPLES

[0149] The water-soluble polyvinyl alcohol (PVOH) is dissolved in aqueous, ethanolic solution and the further ingredients (see below) are added. The required temperature to dissolve the polymer is in a range from 20 C. to 75 C. The mixture is stirred until a homogeneous mixture is obtained. Fragrance wafers were poured on plates of stainless steel coated with melamine or glass plates and, if necessary, dried before packaging.

[0150] The dissolution of the fragrance wafers differs from example to example, depending on the used polymers. To determine the velocity of dissolution, a fragrance wafer is added to 200 ml tap water at a temperature of 24 C. and stirred at 270 rpm with a KPG-stirrer. The dissolution of the fragrance wafer varies in a range of 10 to 30 min. Fragrance wafers containing starch do not completely dissolve in tap water.

[0151] 96% ethanol of different producers can be used. Usual tap water, preferably partially or completely deionised water (different producers) can be used as water. Further ingredients are calcium silicate (Florite R, different producers), perfume oils (different producers), completely gelatinized potato starch (Prejel of DFE Pharma), sugar (glucose, different producers), Hansanol NS 242 conc. (Hansa Group AG) and Rewoquat WE 18 (Evonic Goldschmidt GmbH).

TABLE-US-00001 Example 1 Experiment 1 2 Component Wt. % PVOH 10 10 Ethanol:Water (60:40) ad 100 Additional perfume oil 2 Calcium silicate 1.5-2 1.5 Perfume oil 10 7 Dissolution time in Min. 30 30

TABLE-US-00002 Example 2 Component Wt. % PVOH 5 Starch 3 Ethanol:Water (30:70) ad 100 Sugar 10 Calcium silicate 2.5 Perfume oil 15 Dissolution time in Min. 14

TABLE-US-00003 Example 3 Experiment 1 2 Component Wt. % PVOH 5 5 Starch 3 Ethanol:Water ad 100 ad 100 (30:70)/(60:40) (30:70) (60:40) Sugar 10 10 Sodium laurylsulphate 15 15 Dissolution time in Min. 8 6

TABLE-US-00004 Example 4 Component Wt. % PVOH 5 Starch 3 Ethanol:Water (30:70) ad 100 Sugar 10 Esterquat 5 Dissolution time in Min. 20-25

TABLE-US-00005 Example 5 Component Wt. % PVOH 5 Starch 3 Ethanol:Water (30:70) ad 100 Sugar 10 Capsules (Sym Cap) 1 Calcium silicate 1 Perfume oil 5 Dissolution time in Min. 14