Process for separating polyvinyl alcohol from its solution

Details Process for separating polyvinyl alcohol from its solution Process for separating polyvinyl alcohol from its solution

1975-12-19

1978-03-07

Levin, Stanford M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526 7, 23252R, 210 44, 210 49, C08F 612

Patent

active

040781291

ABSTRACT:
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.

REFERENCES:
patent: 1920564 (1933-08-01), Jochum et al.
patent: 2236061 (1941-03-01), Izard et al.
patent: 3850901 (1974-11-01), Tanaka et al.

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