Process for the preparation of copolyphosphonates having high to

Details Process for the preparation of copolyphosphonates having high to Process for the preparation of copolyphosphonates having high to

1986-05-30

1988-01-12

Anderson, Harold D.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

525462, 525466, 525538, 528167, C08G 7904

Patent

active

047192798

ABSTRACT:
Polyester-phosphonates, polycarbonatophosphonates and polyester-carbonatophosphonates having improved impact strength and notched impact strength as compared with melt-condensation products can be prepared in such a way that, in the first stage, oligophosphonates with hydroxyl end groups are prepared by melt-transesterification and melt-condensation and these are subjected in a second stage to a phase boundary process.

REFERENCES:
patent: 2682522 (1954-06-01), Coover et al.
patent: 4223104 (1980-09-01), Kim et al.
patent: 4322520 (1982-03-01), Schmidt et al.

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