Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1997-02-18
2000-05-23
Mosley-Boykin, Terressa
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
5283082, 5283084, 528483, 528491, 528492, 528499, 528503, C08G 6302
Patent
active
060667133
ABSTRACT:
A process for the improvement of the drawing ability of polyester, pellets of which are thermally post-treated in the solid phase in an inert atmosphere, containing a precise concentration of water vapor. The water vapor concentration is equal to the amount of water, plus 15%/minus 50%, which could theoretically be formed, at the polyester end viscosity, from the --COOH end groups and the excess --OH end groups of the polyester. An equimolar quantity of the vapor of the alkanediol, which serves as the diol reactant for the polyester, may be substituted for all or part of the water vapor.
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Mrose Werner
Thiele Ulrich
Lurgi Zimmer Aktiengesellschaft
Mosley-Boykin Terressa
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