Method for the production polyester with improved melting properties and crystallization properties
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United States of America Patent
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Sep 15, 2015
Grant Date -
Mar 26, 2009
app pub date -
Jan 19, 2006
filing date -
Mar 23, 2005
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Abstract
The method for the production of a polyester with improved melting properties and crystallization properties comprises the steps of (a) production of a pre-polyester melt with an average molecular weight (Mn) of 2000 to 16000 g/mol, (b) solidifying and shaping the melt into pre-polyester particles, and (c) thermally treating the pre-polyester particles in a solid phase in the presence of a transesterification catalyst whereby a molecular weight increase (ΔMn) of more than 2000 g/mol occurs. In addition, the prepolyester particles have a carboxyl end group content (XCOOH) of between 0.25 and 0.6 before step c and during the thermal treatment step c, the proportion of the esterification reaction (E) to the polycondensation reaction (E+T) is between 0.5 and 1.
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