发明授权
- 专利标题: Process for producing pellet of ethylene/vinyl alcohol copolymer
- 专利标题(中): 制备乙烯/乙烯醇共聚物颗粒的方法
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申请号: US10521468申请日: 2003-07-14
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公开(公告)号: US08163212B2公开(公告)日: 2012-04-24
- 发明人: Naohiko Uchiumi , Noriyuki Kida , Hiroyuki Shimo , Kaoru Ikeda
- 申请人: Naohiko Uchiumi , Noriyuki Kida , Hiroyuki Shimo , Kaoru Ikeda
- 申请人地址: JP Kurashiki-shi
- 专利权人: Kuraray Co., Ltd.
- 当前专利权人: Kuraray Co., Ltd.
- 当前专利权人地址: JP Kurashiki-shi
- 代理机构: Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
- 优先权: JP2002-210194 20020718
- 国际申请: PCT/JP03/08897 WO 20030714
- 国际公布: WO2004/009313 WO 20040129
- 主分类号: B29B9/06
- IPC分类号: B29B9/06
摘要:
The present invention provides a process for producing pellet of EVOH comprising the steps of introducing an EVOH solution containing alcohol into an apparatus, contacting the solution with water in the apparatus to let out the alcohol with water and then letting out an EVOH hydrous composition from the above-mentioned apparatus (step 1); cutting the EVOH hydrous composition let out therefrom to obtain EVOH hydrous composition pellets (step 2); introducing the obtained EVOH hydrous composition pellets into a dryer to reduce a water content thereof (step 3); melt-kneading the pellets, whose water content is reduced, in an extruder (step 4); and cutting EVOH discharged from the extruder to obtain the pellet of EVOH (step 5). Thus, the EVOH hydrous composition obtained by removing alcohol without deteriorating the environment can be efficiently dried, and pellets having less thermal degradation in drying and a uniform shape can be obtained.
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