Automatic dishwashing formulation with dispersant copolymer

Patent metadata

Field	Value
Publication number	US-11680230-B2
Application number	US-201917056026-A
Country	US
Kind code	B2
Filing date	May 28, 2019
Priority date	Jun 25, 2018
Publication date	Jun 20, 2023
Grant date	Jun 20, 2023

Abstract

An automatic dishwashing composition is provided including a builder; a phosphonate; a nonionic surfactant; and a dispersant polymer comprising: 60 to 98 wt % of structural units of formula Iwherein each R1 is independently selected from a hydrogen and a —CH3 group; and 2 to 40 wt % of structural units of formula IIwherein each R2 is independently selected from a —C1-4 alkyl group and wherein each R3 is independently selected from a hydrogen and a methyl group.

First claim

We claim:

1. An automatic dishwashing composition, comprising:
a builder, wherein the builder comprises a mixture of at least one carbonate and at least one citrate;
a phosphonate;
a nonionic surfactant; and
a dispersant polymer consisting of:
(a) 80 to 95 wt % of structural units of formula I

wherein each R 1 is a hydrogen; and
(b) 5 to 20 wt % of structural units of formula II

wherein each R 2 is an ethyl group and wherein each R 3 is a hydrogen; and
wherein the dispersant polymer has a weight average molecular weight, M W , of 1,200 to 25,000 Daltons, with the proviso that the dispersant polymer has a weight average molecular weight of 9,398 Daltons when the dispersant polymer comprises 80 wt % of structural units of formula I and 20 wt % of structural units of formula II.

2. The automatic dishwashing composition of claim 1 , wherein the automatic dishwashing composition comprises less than 0.1 wt %, based on the dry weight of the automatic dishwashing composition, of phosphate, measured as elemental phosphorus.

3. The automatic dishwashing composition of claim 2 , wherein the dispersant polymer has a weight average molecular weight, M W , of 1,900 to 14,250 Daltons.

4. The automatic dishwashing composition of claim 3 , wherein the automatic dishwashing composition comprises 0 wt %, based on the dry weight of the automatic dishwashing composition, of builders selected from the group consisting of nitrilotriacetic acid; ethylenediaminetetraacetic acid; diethylenetriaminepentaacetic acid; glycine-N,N-diacetic acid; methyl glycine-N,N-diacetic acid; 2-hydroxyethyliminodiacetic acid; glutamic acid-N,N-diacetic acid; 3-hydroxy-2,2′-iminodissuccinate; S,S-ethylenediaminedisuccinate aspartic acid-diacetic acid; N,N′-ethylene diamine disuccinic acid; iminodisuccinic acid; aspartic acid; aspartic acid-N,N-diacetic acid; beta-alaninediacetic acid; polyaspartic acid; salts thereof and mixtures thereof.

5. The automatic dishwashing composition of claim 4 , further comprising an additive selected from the group consisting of a bleaching agent, a bleach activator, an enzyme, a filler, and mixtures thereof.

6. The automatic dishwashing composition of claim 5 , further comprising an additive, wherein the additive comprises a mixture of a bleaching agent; a bleach activator and an enzyme.

7. The automatic dishwashing composition of claim 6 , wherein the bleaching agent comprises at least one of sodium percarbonate and sodium perborate; wherein the bleach activator includes tetraacetylethylenediamine; and wherein the enzyme comprises a protease and an amylase.

8. The automatic dishwashing composition of claim 1 , comprising:
50 to 85 wt % of the builder, wherein the builder is selected from the group consisting of carbonates, bicarbonates, citrates, silicates and mixtures thereof and wherein the builder comprises a mixture of at least one carbonate and at least one citrate;
0.75 to 7 wt % of the phosphonate;
1.5 to 7.5 wt % of the nonionic surfactant; and
2 to 6 wt % of the dispersant polymer; and wherein the dispersant polymer has a weight average molecular weight, M W , of 1,750 to 17,500 Daltons.

9. A method of cleaning an article in an automatic dishwashing machine, comprising:
providing at least one article;
providing an automatic dishwashing composition according to claim 1 ; and,
applying the automatic dishwashing composition to the at least one article.

Assignees

• Dow Global Technologies Llc
• Rohm & Haas
• Dow Global Tech

Inventors

• Backer Scott
• Mercando Paul
• Umarvadia Ashutosh
• Wasserman Eric
• Ferrieux Severine

Classifications

• C11D3/3905

  Bleach activators or bleach catalysts · CPC title

• C11D3/2086

  Hydroxy carboxylic acids-salts thereof · CPC title

• B08B3/08

  the liquid having chemical or dissolving effect · CPC title

• C11D3/361

  Phosphonates, phosphinates or phosphonites · CPC title

• C11D1/72

  Ethers of polyoxyalkylene glycols · CPC title