发明授权
US5462981A Method of producing plasticized polyvinyl alcohol and its use for the
preparation of starch-based, biodegradable thermoplastic compositions
失效
生产增塑聚乙烯醇的方法及其用于制备淀粉基可生物降解的热塑性组合物的用途
- 专利标题： Method of producing plasticized polyvinyl alcohol and its use for the preparation of starch-based, biodegradable thermoplastic compositions
- 专利标题（中）： 生产增塑聚乙烯醇的方法及其用于制备淀粉基可生物降解的热塑性组合物的用途
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申请号： US280150申请日： 1994-07-25
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公开(公告)号： US5462981A公开(公告)日： 1995-10-31
- 发明人: Catia Bastioli , Vittorio Bellotti , Gianfranco Del Tredici , Roberto Ponti
- 申请人： Catia Bastioli , Vittorio Bellotti , Gianfranco Del Tredici , Roberto Ponti
- 申请人地址： ITX Milan
- 专利权人： Novamont S.p.A.
- 当前专利权人： Novamont S.p.A.
- 当前专利权人地址： ITX Milan
- 优先权： ITXTO91A0849 19911107
- 主分类号： C08J3/20
- IPC分类号： C08J3/20 ; C08J3/18 ; C08K5/00 ; C08L1/00 ; C08L3/00 ; C08L3/02 ; C08L23/02 ; C08L23/26 ; C08L29/04 ; C08L29/14 ; C08L31/04 ; C08L101/16
摘要：
The method of producing plasticized polyvinyl alcohol by mixing polyvinyl alcohol in the presence of an organic plasticizer and water in a quantity which is insufficient to dissolve the polyvinyl alcohol under normal conditions, includes the steps of:i) pre-plasticizing the polyvinyl alcohol at a maximum temperature no higher than its softening point so as to produce a pre-plasticized polyvinyl alcohol having a melting point below the softening point of the polyvinyl alcohol used, andii) further processing the pre-plasticized polyvinyl alcohol thus produced at a temperature above its melting point, under shear-stress conditions and for a period of time to produce a substantially homogeneous melt.
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