| 摘要 |
The invention relates to a process for making a high molecular weight pre-gel for a cross-linked branched polyester comprising:a) reacting polyester precursor repeat units via condensation polymerization in a continuous or semi-continuous, or batch reactor stage to form a low molecular weight pre-gel; andb) further reacting the low molecular weight pre-gel via condensation polymerization in a continuous thin-film reactive vacuum processing stage to form a high molecular weight pre-gel.
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