| abstract |
PCT No. PCT/IT87/00002 Sec. 371 Date Nov. 19, 1987 Sec. 102(e) Date Nov. 19, 1987 PCT Filed Jan. 26, 1987 PCT Pub. No. WO87/04441 PCT Pub. Date Jul. 30, 1987.Method for the preparation of a partially hydrolyzed polyvinyl acetate by polymerizing vinyl acetate in ethanolic solution at a vinyl acetate/ethanol weight ratio of lower than 0.7, cooling the solution until it separates into upper and lower phases, separating the lower phase containing polyvinyl acetate, and hydrolyzing the polyvinyl acetate. The resultant partially hydrolyzed polyvinyl acetate is suitable for use in polymerization of vinyl chloride in aqueous suspension. |