发明名称 |
METHOD FOR OBTAINING OLIGOMERS OF POLYTETRAHYDROFURANE OR TETRAHYDROFURANE COPOLYMERS |
摘要 |
A process for obtaining oligomers of polytetrahydrofuran or of tetrahydrofuran copolymers from a methanolic crude product which contains polytetrahydrofuran or tetrahydrofuran copolymers and is obtained in the transesterification of the mono- and/or diesters of polytetrahydrofuran or tetrahydrofuran copolymers with methanol, which includes a) removing the majority of the methanol from the crude product in a first distillation stage, b) separating the resulting bottom product by distillation into a top fraction containing the oligomers of polytetrahydrofuran or of tetrahydrofuran copolymers, and polytetrahydrofuran or tetrahydrofuran copolymer, and c) condensing the oligomers of polytetrahydrofuran or of tetrahydrofuran copolymers out of the top fraction from stage b). |
申请公布号 |
EP1654243(A1) |
申请公布日期 |
2006.05.10 |
申请号 |
EP20040740087 |
申请日期 |
2004.06.19 |
申请人 |
BASF AKTIENGESELLSCHAFT |
发明人 |
MENGER, VOLKMAR;SCHWARTZTRAUBER, MICHAEL;HAUBNER, MARTIN;PFAFF, KLAUS-PETER |
分类号 |
C08G65/20;C08G65/30;C08G65/331 |
主分类号 |
C08G65/20 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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