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) 2.0 to 20.0 wt. % of a water-soluble polyvinyl alcohol, (b) 1.0 to 40.0 wt. % of an active substance selected from a fragrance, a cleaning-active and/or protecting substance, a functional agent, and a combination thereof, (c) 0 to 5.0 wt. % of starch, and (d) an additive present in an amount up to 10.0 wt. % selected from a filler, a disintegrant, a binder, and absorber, an antimicrobial, a dye, and a combination thereof, wherein the active substance wafer is not in the form of globules or beads but is a solid having a planar structure that can be cut or split into a desired form; the active substance wafer is not an extrusion product; and the weight percentages are based on the total weight of the active substance wafer.

2. The active substance wafer according to claim 1 comprising 3 to 12 wt. % of the water-soluble polyvinyl alcohol.

3. The active substance wafer according to claim 1 comprising 5 to 15 wt. % of the active substance of (b).

4. The active substance wafer according to claim 1 comprising: (a) 5 to 10 wt. % of the water-soluble polyvinyl alcohol, (b) 7 to 15 wt. % of the active substance, wherein the active substance is a fragrance, (c) 2 to 5 wt. % of the starch, and (d) 1 to 8 wt. % of the additive.

5. 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 %.

6. A method for producing the active substance wafer according to claim 1 comprising: providing a substrate material, applying a layer of a mixture to the substrate material, wherein the mixture comprises: (i) a water-soluble polyvinyl alcohol, (ii) an active substance selected from a fragrance, a cleaning-active and/or protecting substance, a functional agent, and a combination thereof, (iii) starch, and (iv) an additive selected from a filler, a disintegrant, a binder, and absorber, an antimicrobial, a dye, and a combination thereof, drying the layer of the mixture applied to the substrate material, and detaching the dried layer of the mixture from the substrate material to obtain the active substance wafer.

7. The method according to claim 6, wherein the mixture comprises a solvent, wherein the water-soluble polyvinyl alcohol is dissolved in the solvent.

8. The method according to claim 7, wherein the solvent is an ethanol-water-mixture.

9. The method according to claim 6, wherein a subsequent layer of the mixture is applied to the dried layer of the mixture and allowed to dry to the dried layer of the mixture.

10. The method according to claim 6, wherein the substrate material comprises a metal, plastic, glass, or a combination thereof.

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

12. The active substance wafer according to claim 5, wherein the water-soluble polyvinyl alcohol has an average degree of hydrolysis of 75 to 95 Mol %.

13. The method according to claim 7, 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.

14. The method of claim 10, wherein the substrate is coated with melanin.

15. 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.

16. The active substance wafer of claim 1 being free from starch.

17. The active substance wafer of claim 1 being free from anionic surfactants.

18. The active substance wafer of claim 1, wherein the active substance wafer dissolves in water at a temperature of 24° C. with stirring at 270 rpm.

19. The active substance wafer of claim 1, wherein the additive comprises a filler selected from sugar, a silicate, or a combination thereof.

20. An active substance wafer produced by: providing a substrate material, applying a layer of a mixture to the substrate material, wherein the mixture comprises: (i) a water-soluble polyvinyl alcohol, (ii) an active substance selected from a fragrance, a cleaning-active and/or protecting substance, a functional agent, and a combination thereof, (iii) starch, and (iv) an additive selected from a filler, a disintegrant, a binder, and absorber, an antimicrobial, a dye, and a combination thereof, drying the layer of the mixture applied to the substrate material, and detaching the dried layer of the mixture from the substrate material to obtain the active substance wafer, wherein the active substance wafer comprises: (a) 2.0 to 20.0 wt. % of a water-soluble polyvinyl alcohol, (b) 1.0 to 40.0 wt. % of an active substance selected from a fragrance, a cleaning-active and/or protecting substance, a functional agent, and a combination thereof, (c) 0 to 5.0 wt. % of starch, and (d) greater than 0 to 10.0 wt. % of an additive selected from a filler, a disintegrant, a binder, and absorber, an antimicrobial, a dye, and a combination thereof, wherein weight percentages are based on the total weight of the active substance wafer, and the active substance wafer is not in the form of globules or beads but is a solid having a planar structure that can be cut or split into a desired form, and the active substance wafer is not an extrusion product.

Description

EXAMPLES

(1) 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.

(2) 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.

(3) 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).

(4) 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

(5) 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

(6) 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

(7) 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

(8) 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