Dispersant polymer for autodish formulations

Patent metadata

Field	Value
Publication number	US-11292991-B2
Application number	US-201816757554-A
Country	US
Kind code	B2
Filing date	Oct 18, 2018
Priority date	Nov 15, 2017
Publication date	Apr 5, 2022
Grant date	Apr 5, 2022

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 Iwherein each R3 is independently selected from a hydrogen and a —C(O)CH3 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) 15 to 45 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 2,250 to 4,250.

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; and, wherein the automatic dishwashing composition contains less than 0.1 wt % phosphate, measured as elemental phosphorus.

5. The automatic dishwashing composition of claim 4 , wherein the lactone end group is a γ-lactone.

6. The automatic dishwashing composition of claim 5 , 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.

7. The automatic dishwashing composition of claim 6 , further comprising an additive selected from the group consisting of a bleaching agent, a bleach activator, an enzyme, a filler, and mixtures thereof.

8. 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
• Gao Wei
• Arturo Steven G
• Konstantinov Ivan A
• Mercando Paul

Classifications

• C11D3/08

  Silicates · CPC title

• C11D3/2086

  Hydroxy carboxylic acids-salts thereof · CPC title

• C11D1/66 Primary

  Non-ionic compounds {(C11D1/002, C11D1/004, C11D1/008 take precedence)} · CPC title

• C11D3/3788

  Graft polymers · CPC title

• C11D3/10

  Carbonates {; Bicarbonates} · CPC title