Polyesters for extrusion applications

Details Polyesters for extrusion applications Polyesters for extrusion applications

C - Chemistry, Metallurgy

08

G

400/5503

C08G 81/00 (2006.01) C08L 67/02 (2006.01)

Patent

CA 1056985

IMPROVED POLYESTERS FOR EXTRUSION APPLICATIONS Abstract of the Disclosure There is disclosed a process for preparing polycarbodi- imide modified thermoplastic polyesters of increased melt strength. These polycarbodiimide modified thermoplastic polyesters are prepared by reacting at elevated temperatures thermoplastic saturated polyesters which are in the molten state with at least one polycarbodiimide such as poly(4,4'-diphenyl- methane carbodiimide) which both (a) is derived from at least one aromatic diisocyanate which is either unsubstituted or contains up to one methyl substituent on each aromatic ring, and (b) contains at least three carbodiimide units per polycarbo- diimide molecule. The resulting polycarbodiimide modified thermoplastic polyester has increased melt strength and intrinsic viscosity and a decreased number of carboxylic acid end groups. These improved melt strength polyesters also have improved die swell characteristics and are useful in extrusion applications such as blow molding. -1-

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