Method for producing a heat-sensitive polyacrylamide derivatives of ultra-high molecular weight

摘要

PURPOSE:To obtain the subject polymer having high strength and losing the water-solubility with heat by adding a cationic surfactant to an aqueous solution of a specific acrylamide-type vinyl compound and radically polymerizing the monomer at a specific temperature. CONSTITUTION:The objective polymer having a molecular weight corresponding to an intrinsic viscosity of 2-6 at 27 deg.C as a THF solution can be produced by adding a cationic surfactant or an anionic surfactant at a concentration above the critical micelle concentration to an aqueous solution of an acrylamide- type vinyl compound (e.g. acrylamide) capable of forming a homopolymer exhibiting thermally reversible hydrophilic-hydrophobic dissolution characteristics and radically (co)polymerizing the monomer at a temperature above the cloud point of the resultant aqueous solution of (co)polymer. The above surfactant is preferably trimethylstearylammonium chloride or sodium dodecylbenzenesulfonate.