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US 5,700,395 AGranted
Dispersants
AssigneeZeneca Limited
InventorsDean Thetford, John David Schofield
Life of this patent
Estimating the term…
Abstract
A dispersant comprising a polyethyleneimine residue carrying polyester chains derived from a caprolactone and at least one other specified lactone or hydroxycarboxylic acid.
Claims10
A dispersant comprising a polyethyleneimine residue carrying a plurality of poly(carbonylalkyleneoxy) chains each chain containing a plurality of repeat units derivable from 6-hydroxyhexanoic acid and at least one other hydroxycarboxylic acid selected from the group consisting of ricinoleic acid, 12-hydroxystearic acid, 12-hydroxydodecanoic acid, 5-hydroxydodecanoic acid, 5-hydroxydecanoic acid and 4-hydroxydecanoic acid;
- the weight ratio of units derivable from 6-hydroxyhexanoic acid to units derivable from the other hydroxycarboxylic acid or acids being in the range from 90:10 to 10:90, or a salt of said polyethyleneimine residue with an acid.
Dependencies are inferred from the claim text.