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US 6,191,253 B1Granted
Polyether phosphates
AssigneeZeneca Limited
InventorsJohn David Schofield, Dean Thetford
Life of this patent
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Abstract
A dispersant for aqueous mill-bases obtainable by reacting a polyethylene glycol with a molar excess of a hydroxycarboxylic acid containing from 4 to 17 carbon atoms or lactone thereof and/or with a C3-4-alkylene oxide to form a polymeric diol and phosphating the diol. The preferred hydroxycarboxylic acid or lactone is ε-caprolactone.
Claims5
A process for making a polymeric diol of Formula 1
- H—A—O—(CH2CH2O—)n—A—H Formula 1
- wherein
- A is the group
- B is C4-17-alkylene;
- m is from 2 to 50;
- n is from 4 to 500;
- which comprises reacting a polyethylene glycol with a molar excess of hydroxy C4C17 alkylene carboxylic acid or lactone thereof in an inert atmosphere at a temperature above 140° C. and below 250° C.
4 more elements
Dependencies are inferred from the claim text.