Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Reexamination Certificate
2006-08-01
2006-08-01
Boykin, Terressa (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
C422S131000, C528S196000, C528S198000, C528S272000
Reexamination Certificate
active
07084234
ABSTRACT:
In a process for producing polyester, the esterification of dicarboxylic acids and diols is carried out in at least one reaction stage, the prepolycondensation of the esterification product in at least one reaction stage and the polycondensation of the prepolycondensation product in at least one reaction stage. To increase the capacity of the apparatus forming one or more of the reaction stages in the production of the polyesters, at at least one of the reaction stages the supplied product system before it enters the reaction stage or within the reaction stage is divided into at least two partial streams and the partial streams entirely or partially separate from one another are passed through the reaction stage.
REFERENCES:
patent: 6358578 (2002-03-01), Otto et al.
patent: 6359106 (2002-03-01), Nakamoto et al.
patent: 2003/0139543 (2003-07-01), Wilhelm et al.
patent: 10001477 (2001-07-01), None
Reisen Michael
Wilhelm Fritz
Boykin Terressa
Myers Jonathan
Zimmer Aktiengesellschaft
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