Polycarbodiimide modification of polyesters for extrusion applic

Details Polycarbodiimide modification of polyesters for extrusion applic Polycarbodiimide modification of polyesters for extrusion applic

1976-08-19

1978-01-31

Cockeram, H.S.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 75NK, 264 98, C08G 6346, B29C 506

Patent

active

040715035

ABSTRACT:
There is disclosed a process for preparing polycarbodiimide modified thermoplastic polyesters having unique rheological properties which include increased intrinsic viscosity and melt strength. These polycarbodiimide modified thermoplastic polyesters are prepared by reacting the carboxyl end groups of thermoplastic saturated polyesters which are in a molten state with the polycarbodiimide groups of 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 polycarbodiimide molecule.
The resulting polycarbodiimide modified thermoplastic polyester has improved melt strength and intrinsic viscosity and a decreased number of carboxylic acid end groups. These improved melt strength polyesters also have improved die swell and shear sensitivity characteristics and are generally useful in extrusion applications such as blow molding.

REFERENCES:
patent: 3193522 (1965-07-01), Neumann et al.
patent: 3193523 (1965-07-01), Neumann et al.
patent: 3193524 (1965-07-01), Holtschmidt et al.
patent: 3296190 (1967-01-01), Reischl et al.
patent: 3378532 (1968-04-01), Fritz et al.
patent: 3575931 (1971-04-01), Sherman
patent: 3835098 (1974-09-01), Brown et al.
Neumann et al., Preparation of Carbodiimides from Isocyanates, 1 Angew. Chem. Internat. Edit. 625 (1962).
Chem. Abs. vol. 60, 9456a (1962).
Chem. Abs. vol. 61, 2054f (1964).
Noller, Chemistry of Organic Compounds, (1965), pp. 345-346.

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