PRODUCTION OF POLYCONDENSATE

PROBLEM TO BE SOLVED: To obtain a high-quality polymer which can provide pellets of which the dispersion of degrees of polymerization is small within one and the same batch. SOLUTION: This invention provides a process for producing a polycondensate by polycondensation by performing the following ste...

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Bibliographic Details
Main Authors NODA MINORU, SHIMIZU MASANOBU, MIKI MASATO
Format Patent
LanguageEnglish
Published 30.09.1997
Edition6
Subjects
CHEMISTRY
COMPOSITIONS BASED THEREON
MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
THEIR PREPARATION OR CHEMICAL WORKING-UP
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Summary:PROBLEM TO BE SOLVED: To obtain a high-quality polymer which can provide pellets of which the dispersion of degrees of polymerization is small within one and the same batch. SOLUTION: This invention provides a process for producing a polycondensate by polycondensation by performing the following steps A and B in the latter stage of the polymerization and discharging the polycondensate from the reactor: the step (A) of keeping the pressure inside the reactor at a subatmospheric pressure for 1min or longer, and the step (B) of keeping the pressure inside the reactor at a superatmospheric pressure in an inert gas atmosphere.
Bibliography:Application Number: JP19960068690