Patent ID: 7030184

Claim:
A method of preparing a cement matrix or hydraulic binder comprising: preparing an aqueous dispersion comprising a mineral filler and a dispersing agent, and adding the aqueous dispersion to a cement or hydraulic binder, wherein the dispersing agent comprises a copolymer prepared by the radical copolymerization of at least one alkoxy-, aryloxy-, alkylaryloxy- or arylalkyloxy-polyalkylene glycol ethylenic urethane monomer with at least one anionic monomer; at least one non-ionic monomer; and at least one alkoxy-, aryloxy-, alkylaryloxy- or arylalkyloxy-polyalkylene glycol acrylate or methacrylate or an alkyloxy-, aryloxy-, alkylaryloxy- or arylalkyloxy-polyalkylene glycol allyl ether.