COLUMN DISSOLUTION FRACTIONATION METHOD OF VINYLIDENE CHLORIDE-BASED COPOLYMER

摘要

PROBLEM TO BE SOLVED: To provide a column dissolution fractionation method having highly accurate reproducibility of a vinylidene chloride-based copolymer. SOLUTION: This column dissolution fractionation method of the vinylidene chloride-based copolymer is characterized by fractionating the vinylidene chloride-based copolymer into a range of 4-25 fractions by using a column filled with a spherical inactive carrier acquired by coating thinly vinylidene chloride-based copolymer solution on a spherical inactive carrier with liquid prepared by adding 10-5,000 ppm of an antioxidant (A) to a good solvent of the vinylidene chloride-based copolymer, and by using as an eluate a mixed solvent wherein the ratio of the good solvent in the mixed solvent comprising the good solvent (liquid to which 10-5,000 ppm of the antioxidant (A) is added) and a poor solvent is changed successively. COPYRIGHT: (C)2006,JPO&NCIPI