It includes polymer by-at least one monomeric acrylic and/or methacrylic acid and/or their any salt that the present invention relates to a kind of for obtaining stable aqueous solution,At least one monomer B acrylate and/or methacrylate,At least one monomer C corresponds to following formula(Ⅰ): T- [( EO ) n ( PO ) n ( BO )N ]-Z here :-T represent end allow be copolymerized monomer C,- [ ( EO ) n ( PO ) n ( BO ) n″)Instead of alkane chain,By alkoxylate unit,It is divided into and is divided into block,Alternating or statistic unit,EO is selected in ethyoxylated units,Propoxylation unit PO,BO Butoxylate units,- n,Then n ,N is indicated,It is independent mutually,Integer 0 changes to 150 total n from 1,When then n n are not zero,Fat person is indicated with-Z,Straight chain or branch at least 16 carbon atoms,At least one cross-linking monomer D.
