Poly 2 - The water suspensoid of puropenaru is formed, the fact that said suspensoid is oxidized hydrogen peroxide, by mixing with the peroxide oxidizer which is chosen from the group which consists of peroxy acid, and its blend is included, poly (2 - puropenaru, 2 - the propene Acid) production manner.ポリ2-プロペナルの水性懸濁液を形成し、過酸化水素、過酸、およびその混合物からなる群から選ばれる過酸化物酸化剤と混合することにより該懸濁液を酸化することを含む、ポリ(2-プロペナル, 2-プロペン酸)の製造方法。