Dart Industries Inc.

Steve G Cottis

Nathan D Field

Richard Layton

The production of oxybenzoyl polyesters is facilitated by the incorporation of a phosphite, particularly an organic phosphite, during the production enabling the production of molded articles from these polyesters of improved appearance and excellent properties.

Production of thermally stabilized aromatic polyesters

The molding properties of molding compounds based on wholly aromatic polyesters are improved by the addition to such wholly aromatic polyester compositions of a minor amount of an aromatic polyester which is a combination of the following units: ##STR1## Where; p=0 to 0.9, q=0.1 to 1.00, r=1 to 7, S=0.3 to 1.00, t=0 to 0.7. A preferred formulation consists of a polyester where the units are: p=0, q=1.0, r=1 to 5 and S=1.0.

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Fort Wright, KY, United States of America

Steve G Cottis