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US 4,452,933 AGranted
Stabilized polyester-polycarbonate blends and stabilization process therefor
AssigneeGeneral Electric Company
InventorRussell J. McCready
Life of this patent
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Abstract
Ester-carbonate interchange in blends of aromatic polycarbonates and poly(alkylene dicarboxylates) is inhibited by adding thereto a hydroxy- or amino-substituted carboxylic acid derivative such as methyl salicylate, malic acid, glycine or dibutyl tartrate.
Claims22
A process for stabilizing a composition comprising
- at least one poly(alkylene dicarboxylate) prepared by the reaction of at least one alkenediol with at least one dicarboxylic acid or dialkyl ester thereof in the presence of a titanium compound as catalyst and
- at least one aromatic polycarbonate,
- which comprises adding thereto an amount effective to inhibit ester-carbonate interchange of at least one .alpha.-hydroxy or .alpha.-amino aliphatic acid derivative, or o-hydroxy or .sigma.-amino aromatic acid derivative, of the formula ##STR6## wherein:
- X.sup.1 is 0 or NH;
- X.sup.2 or OR.sup.5 when X.sup.1 is NH and is OR.sup.5 or NHR.sup.5 when X.sup.1 is 0;
- Z is CH or a single-ring aromatic carbocyclic radical in which the X.sup.1 H and ##STR7## moieties occupy ortho positions;
- R.sup.4 is hydrogen, a lower alkyl radical or a lower aryl radical which optionally contains hydroxy or COOR.sup.5 substituents;
- and
- R.sup.5 is hydrogen, lower alkyl or lower aryl.
6 more elements
Dependencies are inferred from the claim text.