METHOD FOR PRODUCING HYDRATED ETHYLENE-VINYL ALCOHOL COPOLYMER PELLETS

WIPO Patent Application WO/2022/138857

A1

The present invention provides a method for producing hydrated EVOH pellets, said method comprising: a first step wherein a hydrated EVOH, which is at a temperature of from 80°C to 130°C and has a moisture content W1 of from 10% by mass to 90% by mass, is introduced into an extruder, and is melted and kneaded thereby; and a second step wherein hydrated EVOH pellets are obtained by cutting a hydrated EVOH extruded from the extruder. With respect to this method for producing hydrated EVOH pellets, the extruder has a back slit; water is discharged from the back slit; the temperature of the hydrated EVOH extruded from the extruder is from 80°C to 120°C; the moisture content W2 of the hydrated EVOH extruded from the extruder is from 5% by mass to 50% by mass; and the ratio of the moisture content W2 to the moisture content W1, namely W2/W1 is 0.2 or more but less than 1. Since the present production method is capable of efficiently reducing water in a hydrated EVOH, while suppressing elution of EVOH, hydrated EVOH pellets are able to be produced with high productivity. In addition, since the drying efficiency of the present production method is high, the obtained dry EVOH pellets are able to be suppressed in thermal deterioration.

SHIOTA HIROTAKA (JP)

PCT/JP2021/047994

June 30, 2022

December 23, 2021

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KURARAY CO (JP)

C08J3/12

JP2006137957A	2006-06-01
JP2001098077A	2001-04-10
JP2001096530A	2001-04-10
JP2002284811A	2002-10-03
JP2010132881A	2010-06-17

SETOUCHI INTERNATIONAL PATENT FIRM (JP)

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