Process for separating polyvinyl alcohol from its solution

摘要

This invention relates to a process for separating polyvinyl alcohol from a solution. To an aqueous solution of polyvinyl alcohol, a coagulating agent is added. The coagulating agent consists essentially of a salting agent and a salt of boric acid. The salting agent is a member which is selected from the group consisting of an inorganic acid salt of a metal of the first or second groups of the periodic table, an inorganic ammonium salt and an inorganic aluminum salt. Following addition of the coagulating agent, the resulting mixture is agitated in order to coagulate the polyvinyl alcohol. The coagulated polyvinyl alcohol is then separated from the mixture.