Automatic dishwashing tablets

• US 6,162,777 A
• Filed: 11/03/1999
• Issued: 12/19/2000
• Est. Priority Date: 03/25/1999
• Status: Expired due to Fees

• Current Assignee: Colgate-Palmolive Company
• Original Assignee: Colgate-Palmolive Company
• Inventors: Gorlin, Philip, Zyzyck, Leonard
• Primary Examiner(s): Douyon, Lorna M.
• Application Number:
  US09/433,147
• Time in Patent Office: 412 Days
• Field of Search: 510/224, 510/229, 510/233, 510/381, 510/446, 510/509, 510/510, 510/511, 510/512, 510/230, 510/477, 510/441
• US Class Current: 510/224
• CPC Class Codes: C11D 1/722 Ethers of polyoxyalkylene glycols having mixed oxyalkylene groups; Polyalkoxylated fatty alcohols or polyalkoxylated alkylaryl alcohols with mixed oxyalkylele groups C11D1/721 takes precedence
• CPC Class Codes: C11D 1/83 Mixtures of non-ionic with anionic compounds
• CPC Class Codes: C11D 10/04 based on mixtures of surface-active non-soap compounds and soap
• CPC Class Codes: C11D 17/0091 Dishwashing tablets
• CPC Class Codes: C11D 3/046 Salts
• CPC Class Codes: C11D 3/06 Phosphates, including polyphosphates
• CPC Class Codes: C11D 3/08 Silicates
• CPC Class Codes: C11D 3/10 Carbonates ; Bicarbonates
• CPC Class Codes: C11D 3/2086 Hydroxy carboxylic acids-salts thereof
• CPC Class Codes: C11D 3/3761 in solid compositions
• CPC Class Codes: C11D 3/3776 Heterocyclic compounds, e.g. lactam
• CPC Class Codes: C11D 3/378 (Co)polymerised monomers containing sulfur, e.g. sulfonate
• CPC Class Codes: C11D 3/3955 Organic bleaching agents C11D3/3951 takes precedence

Abstract

An automatic dishwashing composition which is in the form of a tablet which generally comprises an alkali metal phosphate detergent builder salt, an alkali metal carbonate, a lubricant, a dialkali metal disilicate, a nonionic surfactant, a crosslinked polyacrylic acid polymer, a wax coated chlorine bleach compound, and optionally an anionic surfactant.

Claims

1. An automatic dishwashing elliptically shaped tablet which comprises approximately by weight:

(a) 20% to 40% of an alkali metal phosphate detergent builder salt;

(b) 10% to 25% of a dialkali metal disilicate;

(c) 10 to 40% of an alkali metal carbonate;

(d) 0.1% to 5% of a low foaming nonionic surfactant;

(e) 0.05% to 3% of a crosslinked polyacrylic acid wherein said crosslinked polyacrylic acid polymer has the structure of;

##STR2## wherein n is a number sufficient to provide a polymer with a molecular weight of about 400,000 to about 2,000,000 and X is an alkali metal or alkaline earth metal cation;

(f) 0.05% to 2% of an alkali metal salt of a fatty acid;

(g) 0 to 1.0% of a pigment or dye;

(h) 10% to 25% of sodium sulfate; and

(i) 1% to 30% of a paraffin wax coated chlorine bleach compound wherein the paraffin wax has a melting point of at least 135°

F. and said paraffin wax coated chlorine compound contains 60 wt % to 90 wt % of the chlorine bleach compound, 10 wt % to 40 wt % of the parraffin wax and 1 wt. % to 10 wt. % of a sodium aluminosilicate flow aid and said automatic dishwashing tablet is elliptically shaped.

2. The composition of claim 1 wherein the dialkali metal disilicate is disodium disilicate.

3. The composition of claim 2 wherein said alkali metal carbonate is sodium carbonate.

4. The composition of claim 3 wherein said nonionic surfactant is a condensation product of a fatty alcohol, ethylene oxide and propylene oxide.

5. The composition of claim 4 wherein said chlorine bleach compound is sodium dichloroisocyanurate.

6. The composition of claim 1 further including 0.1 wt. % to 1.0 wt. % of a crosslinked N-2-polyvinyl pyrrolidone.