Method for continuous treatment of saponified ethylene-vinyl acetate copolymer
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United States of America Patent
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Jun 10, 2003
Grant Date -
Jul 5, 2001
app pub date -
Dec 12, 2000
filing date -
Dec 14, 1999
priority date (Note) -
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Abstract
The method of treating a saponified ethylene vinyl acetate copolymer (A) with an acid (B) and/or its salt (C) which comprises feeding a saponified ethylene-vinyl acetate copolymer (A') in which the acid (B) and/or salt (C) has been incorporated in advance to a column reactor from its top, simultaneously feeding an aqueous solution of the acid (B) and/or salt (C) from the bottom of the reactor to thereby effect a countercurrent contact of (A') with the aqueous solution of (B) and/or (C), withdrawing the excess of the aqueous solution of acid (B) and/or salt (C) from the reactor top, and continuously withdrawing the treated saponified ethylene-vinyl acetate copolymer from the reactor bottom.
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