High molecular weight polymer and producing method the same and drag reducer

摘要

In a radical polymerization reaction, an oxygen absorbent is present in an amount corresponding to the amount of dissolved oxygen in a polymerization reaction system. As the oxygen absorbent, an oxygen absorbent which is soluble in a solvent used and has a strong reducing power is preferable. The radical polymerization by emulsion polymerization process is carried out at a reaction temperature of not more than 50 DEG C employing a seed polymerization method. In the radical polymerization reaction, by effectively removing the dissolved oxygen present in the polymerization reaction system, a high molecular weight polymer (a) having higher molecular weight than the conventional polymer, (b) having a straight-chain structure with less branching, and (c) being soluble in an organic solvent is produced by a producing method which is stabilized and controlled with ease. The product polymer is suitably adopted as a drag reducer. <IMAGE>