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公开(公告)号：CH606820A5
公开(公告)日：1978-11-15
申请号：CH368376
申请日：1976-03-24
Applicant: BASF AG
Inventor： HOERAUF WERNER DR , PIRZER HANS DR , GUENTHER ERNST , NEUMANN ECKART , DIETRICH ERNST
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公开(公告)号：DE2861668D1
公开(公告)日：1982-04-15
申请号：DE2861668
申请日：1978-08-16
Applicant: BASF AG
Inventor： STERZEL HANS-JOSEF DR , VON DZIEMBOWSKI KASIMIR , PIRZER HANS DR
Abstract: A process for the manufacture of high molecular weight linear polyesters which are derived from dicarboxylic acids or their ester-forming derivatives and from diols, by condensing polyester precondensates, having a relative viscosity of at least 1.05, at from 270 DEG to 340 DEG C. under reduced pressure, the condensation being started at from 290 DEG to 340 DEG C. and the temperature being lowered as the condensation progresses, the final temperature being at least 10 DEG C. above the melting point of the particular polyester produced, and an apparatus for carrying out the process.
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公开(公告)号：DE2960225D1
公开(公告)日：1981-04-23
申请号：DE2960225
申请日：1979-03-15
Applicant: BASF AG
Inventor： STERZEL HANS-JOSEF DR , SCHMIDT FRANZ DR , PIRZER HANS DR
Abstract: A process for the preparation of high molecular weight linear saturated polyesters derived from dicarboxylic acids or their ester-forming derivatives and aliphatic and/or cycloaliphatic diols, comprising the condensation of polyester precondensates having a relative viscosity of from 1.05 to 1.15 at from 220 DEG to 280 DEG C. under reduced pressure, wherein (a) the condensation is first started with from 70 to 95 percent by weight of the polyester precondensate and (b) after from 10 to 50% of the total condensation time the remaining 5 to 30 percent by weight of the polyester precondensate are added to the polyester melt undergoing condensation in accordance with (a), and the condensation is taken to completion.
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公开(公告)号：CH454459A
公开(公告)日：1968-04-15
申请号：CH1188465
申请日：1965-08-24
Applicant: BASF AG
Inventor： ERNST GUENTHER , LINGE HERMANN DR , KURT NOE , PIRZER HANS DR
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