Method of saponifying vinyl acetate copolymers
Abstract
Abstract POLYMERS OF ETHYLENE, VINYL ACETATE AND A MONOMER HAVING THE STRUCTURE CH2=C(-R)-R'' WHEREIN R IS SELECTED FORM THE GROUP CONSISTING OF HYDROGEN AND METHYL AND R'' IS SELECTED FROM THE GROUP CONSISTING OF -COOR", -C6H5, -CL, -CN, -CH3 AND -CH=CH2, AND R" REPRESENTS HYDROGEN OR LOWER ALKYL, THE MOLE RATIO OF ETHYLENE TO VINYL ACETATE AND THE MONOMER BEING IN THE RANGE OF ABOUT 0.5:1 TO 9:1 AND THE MOLE RATIO OF THE MONOMER TO VINYL ACETATE BEING IN THE RANGE OF ABOUT 0:1 TO 0.1:1 ARE SAPONIFIED BY CONTACTING IN A REACTION TOWER MAINTAINED UNDER SAPONIFICATION REACTION CONDITIONS A SOLUTION OF THE POLYMER AND A BASIC CATALYST COUNTERCURRENTLY WITH ALCOHOL VAPOR IN AN AMOUNT SUFFICIENT TO EFFECT SAPONIFICATION AND REMOVE FROM THE REACTION TOWER AS OVERHEAD ACETIC ACID ESTER FORMED AS A RESULT OF THE SAPONIFICATION REACTION.
Inventors
- 👤 Kiyoshi Yonezu
- 👤 Kinichi Nishioka
- 👤 Kazuo Mukumoto
Bibliographic Details
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