A dispersant which comprises the reaction product of a phosphating agent such as polyphosphoric acid and a compound of formula R—OH wherein R is a residue of a polyester and/or polyether having a polymerisation terminating group and where the ratio of each phosphorus atom of the phosphating agent to RO—H is from 1.3:1 to 3:1. The dispersants are thought to be pyrophosphates.
这种分散剂包括
磷酸化剂(如聚
磷酸)和化合物R—OH(其中R是聚酯和/或聚醚的残基,具有聚合终止基团)的反应产物,其中
磷酸化剂中每个
磷原子与RO—H的比例为1.3:1到3:1。这些分散剂被认为是
焦磷酸盐。