Process for the production of polyester resins for fibers
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United States of America Patent
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Oct 29, 1996
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N/A
app pub date -
Apr 11, 1994
filing date -
Jun 10, 1992
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Expired
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Abstract
Process for the production of polyester resins suitable for the manufacture of fibers including a phase of esterification of an aromatic dicarboxylic acid with an alkylenic glycol or of transesterification of a diester of the dicarboxylic acid with the alkylenic glycol, of polycondensation of diester obtained to form a prepolymer with intrinsic viscosity between 0.2 and 0.5 dl/g and, lastly, of polycondensation of the melt polymeric mass added with a dianhydride of a tetracarboxylic acid kept in agitation and on which an inert gas current is circulated.
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