BigPatents India

A dispersant which comprises a polyamine (e.g. polyallylamine) or polyimine (e.g. polyethyleneimine) backbone chain containing side chains of two or more different types of polyester chain wherein at least one type of polyester chain is derivable from one or more hydroxy carboxylic acids all of which contain a C1-6-alkylene group or lactone thereof such as epsilon -caprolactone and/or delta -valerolactone and at least one other type of polyester chain derivable from one or more hydroxy carboxylic acids wherein at least one of the hydroxy carboxylic acids contains a C8-30-alkylene chain (e.g. 12-hydroxystearic acid) or a C8-30-alkenylene chain (e.g. ricinoleic acid) or lactone thereof.