High IV melt phase polyester polymer catalyzed with antimony containing compounds
View Patent ↗A melt phase process for making a polyester polymer melt phase product by adding an antimony containing catalyst to the melt phase, polycondensing the melt containing said catalyst in the melt phase until the It.V. of the melt reaches at least 0.75 dL/g. Polyester polymer melt phase pellets containing antimony residues and having an It.V. of at least 0.75 dL/g are obtained without solid state polymerization. The polyester polymer pellets containing antimony residues and having an It.V. of at least 0.70 dL/g obtained without increasing the molecular weight of the melt phase product by solid state polymerization are fed to an extruder, melted to produce a molten polyester polymer, and extruded through a die to form shaped articles. The melt phase products and articles made thereby have low b* color and/or high L* brightness, and the reaction time to make the melt phase products is short.
1. A process for making a polyester polymer melt phase product containing an organic bluing toner comprising adding at least one catalyst compound comprising an antimony containing catalyst to a melt and polymerizing the melt in the presence of said antimony containing catalyst to produce a polyester polymer melt phase product having an It.V. of at least 0.75 dl/g, a b* color of −5 to +5, and an L* brightness of at least 70, wherein the polyester polymer melt phase product comprises a polyalkylene terephthalate homopolymer or copolymer modified with one or more modifiers in an amount less than 15 mole percent, and wherein the polymerizing of the melt is conducted in the absence of added catalyst compounds containing titanium.
2. The process of claim 1 , wherein the product further comprises a reheat additive.
3. The process of claim 2 , wherein the reheat additive is in combination with antimony reduced to the zero oxidation state in-situ in the melt.
4. The process of claim 1 , wherein the product contains more than 4 ppm of a reheat additive.
5. The process of claim 1 , wherein the amount of bluing agent added is 4 ppm or more.
6. The process of claim 1 , wherein the reaction time from an It.V. of about 0.45 to about 0.7 is about 100 minutes or less.
7. The process of claim 1 , wherein the polycondensation reaction time in a finishing zone is about 100 minutes or less.
8. A polyester polymer composition containing antimony residues and substantially free of titanium residues comprising a polyester polymer having a b* color of −5 to +5, and L* of at least 70 CIELAB units, and an It.V. of at least 0.75 dL/g obtained without subjecting the polymer to an increase in its molecular weight through solid state polymerization, wherein the polyester polymer comprises a polyalkylene terephthalate homopolymer or copolymer modified with one or more modifiers in an amount less than 15 mole percent.
9. The composition of claim 8 , wherein the composition further comprises at least 4 ppm of a reheat additive.
10. The composition of claim 8 , further comprising a bluing toner.