Polyester resins having improved rheological properties
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United States of America Patent
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Sep 10, 2002
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Jul 3, 1996
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Jul 5, 1995
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Abstract
Polyester resins particularly suitable for extrusion and injection blow-molding contain from 20 to 1000 ppm of a dianhydride of an aromatic tetracarboxylic acid and show values of die swell less than 45%. The resins are obtained by solid state polycondensation of resin having intrinsic viscosity less than 0.7 dl/g, added with a dianhydride of an aromatic tetracarboxylic acid in amount between 0.02 and less than 0.05% by weight.
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