Automatic dishwashing composition with dispersant polymer

Patent metadata

Field	Value
Publication number	US-11015147-B2
Application number	US-201816637868-A
Country	US
Kind code	B2
Filing date	Jul 31, 2018
Priority date	Aug 30, 2017
Publication date	May 25, 2021
Grant date	May 25, 2021

Abstract

An automatic dishwashing composition is provided including a builder selected from the group consisting of carbonate, bicarbonate, citrate, silicate and mixtures thereof; a nonionic surfactant; and a dispersant polymer comprising: (a) 5 to 75 wt % of structural units of itaconic acid; (b) 10 to 85 wt % of structural units having formula I

wherein each R 3 is independently selected from a hydrogen and a —C(O)CH 3 group; and (c) 10 to 65 wt % of structural units of (meth)acrylic acid; wherein the dispersant polymer has a lactone end group and wherein the dispersant polymer has a weight average molecular weight of 1,500 to 6,000.

First claim

We claim:

1. An automatic dishwashing composition, comprising:
a builder selected from the group consisting of carbonate, bicarbonate, citrate, silicate and mixtures thereof;
a nonionic surfactant; and
a dispersant polymer comprising:
(a) 5 to 75 wt % of structural units of itaconic acid;
(b) 10 to 85 wt % of structural units having formula I

wherein each R 3 is independently selected from a hydrogen and

a —C(O)CH 3 group; and
(c) 10 to 65 wt % of structural units of (meth)acrylic acid;

wherein the dispersant polymer has a lactone end group and wherein the dispersant polymer has a weight average molecular weight of 1,500 to 6,000.

2. The automatic dishwashing composition of claim 1 , wherein R 3 is hydrogen in 0 to 50 mol % of the structural units of formula I in the dispersant polymer.

3. The automatic dishwashing composition of claim 1 , wherein the automatic dishwashing composition contains less than 0.1 wt % phosphate, measured as elemental phosphorus.

4. The automatic dishwashing composition of claim 1 , wherein the automatic dishwashing composition contains 0 wt % 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 , wherein the automatic dishwashing composition contains less than 0.1 wt % phosphate, measured as elemental phosphorus.

6. The automatic dishwashing composition of claim 5 , wherein the lactone end group is a y-lactone.

7. The automatic dishwashing composition of claim 6 , wherein the dispersant polymer has formula II

wherein A is a polymer chain comprising the structural units of itaconic acid, the structural units having formula I and the structural units of (meth)acrylic acid; wherein R 1 is methyl; and wherein R 2 is methyl.

8. The automatic dishwashing composition of claim 7 , further comprising an additive selected from the group consisting of a bleaching agent, a bleach activator, an enzyme, a filler, and mixtures thereof.

9. The automatic dishwashing composition of claim 7 , further comprising an additive, wherein the additive includes a mixture of a bleaching agent; a bleach activator and an enzyme.

10. 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

Inventors

• Wang Lin
• Singh Anurima
• Backer Scott
• Mercando Paul

Classifications

• C11D3/2093

  Esters; Carbonates · CPC title

• C11D3/3905

  Bleach activators or bleach catalysts · CPC title

• C11D3/3761 Primary

  in solid compositions · CPC title

• C11D3/10

  Carbonates {; Bicarbonates} · CPC title

• C11D3/3776 Primary

  Heterocyclic compounds, e.g. lactam · CPC title