Process for the production of break-resistant, storable multifunctional detergent tablets

• US 5,854,189 A
• Filed: 09/13/1996
• Issued: 12/29/1998
• Est. Priority Date: 03/15/1994
• Status: Expired due to Fees

• Current Assignee: Henkel KGaA (Henkel AG & Co KGaA)
• Original Assignee: Henkel KGaA (Henkel AG & Co KGaA)
• Inventors: Kruse, Hans, Jacobs, Jochen, Jeschke, Peter
• Primary Examiner(s): Lieberman, Paul
• Assistant Examiner(s): Douyon, Lorna M.
• Application Number:
  US08/716,220
• Time in Patent Office: 837 Days
• Field of Search: 510/224, 510/225, 510/227, 510/441, 510/446, 510/477, 510/478
• US Class Current: 510/224
• CPC Class Codes: C11D 17/0082 Coated tablets

Abstract

The process of producing break-resistant and storage-stable detergent tablets comprising coating powdered or crystalline detergent components present in anhydrous form or having a low degree of hydration with a hydrophobicizing agent, and tabletting the resulting mixture under pressure to produce tablets having a breaking strength of at least 150 N.

Claims

1. A water free process of producing break-resistant and storage-stable detergent tablets consisting of coating powdered detergent components selected from the group consisting of builders, bleaching agents, enzymes and 0.2 to 4%/wt of nonionic surfactants, each component present being in anhydrous form with 1 to 5% by weight of a hydrophobicizing agent selected from the group consisting of paraffin oils and solid paraffins having a melting point of from 30°

C. to 60°

C., based on the weight of said tablets;

optionally adding nonionic surfactants or perfume oil to said hydrophobicizing agent before spraying;

or applying said nonionic surfactants or perfume oil to the powdered detergent components before coating with said hydrophobicizing agent; and

tabletting the resulting mixture under pressure to produce tablets having a breaking strength of at least 150N.

2. A process as in claim 1 wherein said detergent tablets have a low degree of alkalinity, are phosphate- and silicate-free and are suitable for machine dishwashing.

3. A process as in claim 1 wherein said builder is selected from the group consisting of citric acid, citric acid salts, alkali metal hydrogen carbonates, and acrylic acid/maleic acid copolymers.

4. A process as in claim 1 wherein said tablets have a high degree of alkalinity with pH values above 11.