申请人:RUSSELL WILLIAM RICHARD
公开号:US20120264857A1
公开(公告)日:2012-10-18
A composition of matter consisting of a stable solution containing a polymer derived from a solution of a polymer containing trace metals, the derived method comprising the steps of:
(a) providing a polymer solution containing a polymer, a first solvent and trace metals;
(b) passing said polymer solution through an acidic cation ion exchange material to remove said trace metals therefrom and thereby forming a polymer solution containing free acid radicals;
(c) precipitating said polymer from said polymer solution of step b by contacting with a second solvent wherein the polymer is substantially insoluble therein;
(d) filtering said solution and said second solvent to thereby form a solid polymer cake; and
(e) contacting said cake from step d with sufficient quantities of additional said second solvent in order to remove free acid radicals therefrom.