Polyester resins having improved rheological properties

Details Polyester resins having improved rheological properties Polyester resins having improved rheological properties

C - Chemistry, Metallurgy

08

G

C08G 63/20 (2006.01) C08G 63/181 (2006.01) C08G 63/80 (2006.01) C08G 63/91 (2006.01)

Patent

CA 2180594

Polyester resins particularly suitable for extrusion 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 an amount from 0.002 and 0.1% by weight.

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