Title:
METHOD FOR PRODUCING ETHYLENE/VINYL ACETATE COPOLYMER SAPONIFICATE
Document Type and Number:
Japanese Patent JP3954290
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To efficiently and stably produce an ethylene/vinyl acetate copolymer saponificate (EVOH) capable of giving a molding, e.g. a film, prevented from suffering poor appearance by improving a step of washing chips of EVOH.
SOLUTION: This method comprises: introducing EVOH chips in a state containing methanol into a tower washer 10 from its top, introducing water into the washer 10 from its bottom 3, and maintaining the methanol concentration of the solution at the top at 25-45 wt.% while settling the chips from the top, discharging the methanol and the water from the top 2, and discharging the chips together with water containing methanol of a concentration lower than that at the top. It is also possible to introduce an adjusting liquid containing methanol into the washer 10 from its top 1.
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Inventors:
Noboru Yanagida
Application Number:
JP2000253324A
Publication Date:
August 08, 2007
Filing Date:
August 24, 2000
Export Citation:
Assignee:
KURARAY CO.,LTD.
International Classes:
C08F6/00; C08F8/12; C08F210/00; C08F218/00; C08F210/02; C08F218/08; (IPC1-7): C08F6/00; C08F8/12; C08F210/02; C08F218/08
Domestic Patent References:
| JP2000281715A | ||||
| JP47038634B1 | ||||
| JP49009633B1 | ||||
| JP11152307A | ||||
| JP50004188A |
Attorney, Agent or Firm:
Hiroyuki Ikeuchi
Kimihiro Sato
Koichi Kamata
Keiji
Kimihiro Sato
Koichi Kamata
Keiji
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