Back to results
US 12,098,318 B2Granted
Multi-amine polyester dispersant made via an anhydride intermediate
AssigneeLubrizol Advanced Materials, Inc.
InventorsElliot Coulbeck, Dean Thetford
Life of this patent
Estimating the term…
Abstract
The present invention relates to a dispersant derived from anhydride functionalized polyester derived from carboxylic acid functionalized polyester. The anhydride functionalized polyester is then reacted with a multi-amine species forming amide and salt bonds. The technology allows lower reaction temperatures when the multi-amine species is present. The lower reaction temperature allows the use of a broader selection of polyester repeat units.
Claims13
A method of preparing a polyester containing dispersant by reacting a pre-made polyester with a multi-amine species comprising the steps of:
- a) preparing a polyester having a single carboxylic acid terminal group and 3 to 43 ester repeat units on average in each chain;
- b) converting at least 10 mole % of carboxylic acid terminal groups on said polyester to anhydride functionality by reacting with a dehydrating agent which is an anhydride of two carboxylic acid molecules of 2 to 5 carbon atoms;
- and
- c) reacting the reaction product of step b) with a multi-amine species at a temperature of 100° C. or less to create a multi-amine with pendant polyester chains thereon.
1 more element
Dependencies are inferred from the claim text.