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US 5,962,625 AGranted
High clarity polyester containing sub-visual antimony phosphate derivatives particles
AssigneeEastman Chemical Company
InventorCheuk Chung Yau
Life of this patent
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Abstract
Disclosed herein is an esterification process characterized by the high dilution in situ addition of antimony catalyst compound and phosphorus stabilizer compound to the esterification reaction mixture. A high dilution polymerization process for producing antimony phosphate derivative-containing polymer is also disclosed. Further disclosed are high clarity polyesters containing sub visual antimony phosphate derivative particles.
Claims21
A process comprising:
- reacting at least one dicarboxylic acid or ester thereof having 2 to about 20 carbon atoms with at least one diol having 2 to about 16 carbon atoms in a solvent having a boiling point between above the boiling point of water and about 300.degree. C., under esterification or prepolymer conditions comprising a temperature from above about the boiling point of water to about 300.degree. C., and a pressure of about 10 to 800 kPa,
- said process being characterized by separately adding, under high dilution, antimony catalyst compound and phosphorus stabilizer compound to said mixture, thereby forming polyester oligomers containing antimony phosphate derivative particles.
A polyester oligomer comprising:
- (a) a dicarboxylic acid component comprising dicarboxylic acid units having 2 to about 20 carbon atoms;
- and
- (b) a diol component comprising diol units having 2 to about 16 carbon atoms;
- said oligomer having an inherent viscosity from above 0 to about 0.2 dL/g, measured in 40:60 v/v phenol/tetrachloroethane, and wherein said oligomer contains antimony phosphate derivative particles having an average diameter less than about 200 nm.
1 more element
A polyester comprising:
- (a) a dicarboxylic acid component comprising dicarboxylic acid units having 2 to about 20 carbon atoms;
- and
- (b) a diol component comprising glycol units having 2 to about 16 carbon atoms;
- said polymer having an inherent viscosity of about 0.2 to 1.2 dL/g, as determined in 40:60 v/v phenol/tetrachloroethane, and
- (c) antimony phosphate derivative particles having an average diameter of less than about 200 nm.
2 more elements
A process comprising:
- reacting at least one dicarboxylic acid or ester thereof having 2 to about 20 carbon atoms with at least one diol having 2 to about 16 carbon atoms in a solvent having a boiling point between above the boiling point of water and about 300.degree. C., under esterification or prepolymer conditions comprising a temperature from above about the boiling point of water to about 300.degree. C., and a pressure of about 10 to 800 kPa., said process being characterized by adding preformed antimony phosphate derivative particles suspended in at least one diol and forming polyester oligomers containing antimony phosphate derivative particles.
Dependencies are inferred from the claim text.