Multifunctional copolymer water treatment agent is most widely used; multifunctional, efficient and biodegradable green agents will be the research trends in future.

Additives: multifunctional additives AMP, wetting agents, HEC from Dow Chemical; biocide from Thor, rheological additives, dispersion agents and defoamers from Elementis and coalescing agents etc.

Polymeric multifunctional carboxylic acids as a kind of environmentally benign wet- strength agents were recognized. We got some delightful achievement on its research.