VERFAHREN ZUR HERSTELLUNG HOCHMOLEKULARER POLYESTER
The object is to prepare a high-molecular-weight polyester in such a way that it is possible to make even relatively small amounts of very high molecular weight available in an advantageous manner. This is achieved by preparing a polyester containing an alkenediol by continuing the polycondensation...
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Main Authors | , |
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Format | Patent |
Language | German |
Published |
15.07.1997
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Edition | 6 |
Subjects | |
Online Access | Get full text |
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Summary: | The object is to prepare a high-molecular-weight polyester in such a way that it is possible to make even relatively small amounts of very high molecular weight available in an advantageous manner. This is achieved by preparing a polyester containing an alkenediol by continuing the polycondensation step to a viscosity number of 50 - 140 cm /g and treating the resultant polyester with from 0.001 to 8 % by weight of a free-radical former which decomposes at temperatures in the range from 130 to 350 @C with a half value period of from 5 s to 120 min, and subsequently continuing the polymerisation to the requisite viscosity number. The process according to the invention allows high-molecular-weight polyesters having the desired property profile to be obtained. |
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Bibliography: | Application Number: AT19930121162T |