Abstract: Organometallic radiation resist compositions are described based on tin ions with alkyl ligands. Some of the compositions have branched alkyl ligands to provide for improved patterning contrast while maintaining a high degree of solution stability. Blends of compounds with distinct alkyl ligands can provide further improvement in the patterning. High resolution patterning with a half-pitch of no more than 25 nm can be achieved with a line width roughness of no more than about 4.5 nm. Synthesis techniques have been developed that allow for the formation of alkyl tin oxide hydroxide compositions with very low metal contamination.

Abstract: The hydrothermal reaction between bioactive metals (Ca2+, Zn2+, and Mg2+) salts and clinically utilized bisphosphonate (BP) alendronic acid (ALEN) were performed to prepare several bisphosphonate-based biocompatible coordination complexes (pBioCCs). The invention describes the effect of three variables M2+/BP molar ratio, reaction temperature, and pH on the reaction outcomes yields an unprecedented number of crystalline materials of enough crystal quality for structural elucidation. The crystal structure was unveiled by single crystal X-ray diffraction at 100 K and their solid-state properties revealed in tandem with other characterization techniques: thermogravimetry, vibrational spectroscopy, and elemental analysis. The invention provides materials with high structural stability and dissolution properties paving the way for better formulation strategies for alendronic acid (ALEN) through the design of pBioCCs for the treatment of bone-related diseases.

Abstract: A composition comprising a blend of: a) one or more polycarbonates; b) one or more polyesters; c) one or more core shell rubbers having glycidyl groups on the surface of the core; and d) one or more halogenated fire retardant agent; wherein the polycarbonates and polyesters form separate phases and the core shell rubber is located in the polyester phase. The compositions may further comprise a fluoropolymer capable of functioning as an anti-drip agent. The compositions exhibit a flame retardant rating according to UL-94 at V-0 of 3.0 mm or less; a notched Izod impact strength of about 8 foot pounds per inch or greater (0.90 joules) and chemical resistance to one or more of the common cleaning compositions selected from bleach, polyethylene glycol, a mixture of aryl substituted phenols and aryl substituted chlorophenols, a mixture of an alkanol and a monoalkyl ether of ethylene glycol, and one or more ammonium chlorides.

Abstract: The present invention relates to a polylactide resin having excellent heat resistance, a preparation method thereof, and a polylactide resin composition including the same. The polylactide resin is characterized by high polymerization activity owing to an organic coordinated metal catalyst even though it has a low catalyst content, and a molecular weight reduction due to thermal decomposition at high temperature and a rate of thermal decomposition including depolymerization are greatly suppressed by a low catalyst content and a low resin acidity, and thus provided is the polylactide resin having superior heat resistance.

Abstract: There is provided a polyester resin including: moieties of dicarboxylic acid components including terephthalic acid; and moieties of diol components including 5 to 60 mole % of isosorbide, 10 to 80 mole % of a cyclohexanedimethanol, and the balance of other diol compounds, wherein the polyester resin has an intrinsic viscosity of 0.5 to 1.

Abstract: The disclosure describes a process for making a polyester resin of defined acid value using a temperature-sensitive reaction and dipropylene glycol as a reagent.

Abstract: The present invention relates to an organotin compound represented by R1O—Sn—OR2 (where R1 and R2 are independently a primary, secondary, or tertiary alkyl group having 5 to 30 carbon atoms), a preparation method thereof, and a preparation method for polylactide using the organotin compound. The organotin compound of the present invention is easy to prepare and is used to prepare a polylactide resin having a high molecular weight at a high yield without using a separate initiator.

Abstract: A method can include immortal ring-opening homopolymerisation of cyclic carbonates or cyclic esters in the presence of a catalytic system, or sequential two-step ring-opening block copolymerisation of one or more cyclic monomers selected from cyclic carbonates or cyclic esters in the presence of the catalytic system. The catalytic system can include a phenolate supported metallic complex. The catalytic system can also include an alcohol or a primary amine containing aliphatic and/or aromatic moieties. The alcohol or primary amine can be present in a molar ratio with respect to the metallic complex that is larger than 1.

Abstract: The present invention relates to a preparation method of a polylactide resin, in which the preparation method includes the step of performing ring opening polymerization of lactide monomers in the presence of an organometallic catalyst and an aromatic monomer scavenger, and the aromatic monomer scavenger is used in an amount of 0.1 to 20 parts by weight, based on 100 parts by weight of the lactide monomers.

Abstract: The present invention relates to a polylactide resin having excellent heat resistance, a preparation method thereof, and a polylactide resin composition including the same. The polylactide resin is characterized by high polymerization activity owing to an organic coordinated metal catalyst even though it has a low catalyst content, and a molecular weight reduction due to thermal decomposition at high temperature and a rate of thermal decomposition including depolymerization are greatly suppressed by a low catalyst content and a low resin acidity, and thus provided is the polylactide resin having superior heat resistance.

Abstract: Disclosed are polylactide resin that may exhibit and maintain excellent mechanical properties, exhibit excellent heat resistance, and thus can be used for a semi-permanent use, a method for preparing the same, and a polylactide resin composition comprising the same. The polylactide resin has a low hydrolysis rate constant of 0.1 day?1 or less and a weight average molecular weight of 100,000˜1,000,000, under specific conditions.

Abstract: The present invention relates to a polysiloxane-polylactide block copolymer and a preparation method thereof, in which the polysiloxane-polylactide block copolymer has improved impact resistance and flexibility, compared to the conventional polylactide resins and can be prepared by ring-opening polymerization of lactide monomers in the presence of a polymerization initiator of polysiloxane.

Abstract: The present invention relates to a polylactide resin having excellent heat resistance, a preparation method thereof, and a polylactide resin composition including the same. The polylactide resin is characterized by high polymerization activity owing to an organic coordinated metal catalyst even though it has a low catalyst content, and a molecular weight reduction due to thermal decomposition at high temperature and a rate of thermal decomposition including depolymerization are greatly suppressed by a low catalyst content and a low resin acidity, and thus provided is the polylactide resin having superior heat resistance.

Abstract: The present invention relates to aliphatic or aliphatic-aromatic polyesters and copolyesters comprised of biobased ?-hydroxyfatty acids or derivatives thereof, processes for the preparation thereof, and compositions thereof having improved properties. The copolyesters of the present invention may also contain additional components that can be selected from aliphatic or aromatic diacids, diols and hydroxyacids obtained from synthetic and natural sources. The biobased ?-hydroxyfatty acids that comprise the polyesters and copolyesters of the present invention are made using a fermentation process from pure fatty acids, fatty acid mixtures, pure fatty acid ester, mixtures of fatty acid esters, and triglycerides from various sources. The polyesters of the present invention may contain various amounts and types of ?-carboxyfatty acids depending on the engineered yeast strain used for the bioconversion as well as the feedstock(s) used.

Abstract: Provided is a composition for manufacturing a polyester resin having a molar ratio of a diol compound to a dicarboxylic acid compound ranging from 1.05 to 1.4, in which the composition includes 5 ppm to 50 ppm of a phosphorous (P) compound (based on an amount of P), 10 ppm to 40 ppm of a cobalt (Co) compound (based on an amount of Co), 0.2 ppm to 20 ppm of a color enhancer, and 5 ppm to 25 ppm/3 ppm to 30 ppm of a titanium (Ti)-germanium (Ge) composite catalyst compound (based on an amount of Ti/Ge), based on weight percentage.

Abstract: The invention relates to a mixture of glycerol, mono-, di- and triacetylglycerolester in which the amount of tri-ester is less than 15 mol %, the amount of glycerol is less than 25 mol %, the amount of monoester is about 20 mol % or more, more preferred about 30 mol % or more and the amount of diester is about 20 mol % or more preferred about 40 mol % or more. The invention further relates to methods to prepare such glycerolacetylester mixtures, and to the use thereof in the preparation of unsaturated polyesters. Polyesters comprising said glycerolacetylester mixtures are made from a higher amount of raw materials than obtainable from renewable resources.

Abstract: A process for removing metal species from a composition comprising contacting: a. an oligomer mixture stream comprising the monomers of a partially aromatic polyester polymer and at least one metal species, or b. a molten polyester polymer stream comprising partially aromatic polyester polymers and at least one metal species, with a non-catalytic porous material in the presence of hydrogen to produce a treated stream containing a reduced amount of at least one metal species. There are provided compositions comprising a partially aromatic polyester polymer having an It.V. of at least 0.50 produced in a direct esterification melt phase process, from greater than 0 to less than 50 ppm antimony, and less than 40 ppm cobalt, or produced in an ester exchange melt phase process, having from greater than zero to less than 5 ppm titanium and less than 10 ppm manganese.

Abstract: The present invention provides cyclic dimers of alpha acids and polymers derived therefrom. Also provided are processes for preparing and methods of using the cyclic dimers and the polymers derived from the cyclic dimers.

Abstract: The present invention relates to a process for the preparation of branched biodegradable polymers comprising of the steps of: (a) preparing a macromonomer by ring-opening polymerization of at least one cyclic ester, cyclic carbonate, and/or cyclic carboxyanhydride in the presence of a branching agent and optionally a catalyst; and (b) subsequent polycondensation of the macromonomer, to a process for the preparation of a macromonomer by ring-opening polymerization of at least one cyclic ester, carbonate and/or N-carboxyanhydride in the presence of a defined branching agent and optionally a catalyst, according to step (a), and to the prepared macromonomer and branched biodegradable polymer and their uses.

Abstract: The present invention relates to a process for preparation of polyester resin in the presence of a novel catalyst system comprising an antimony compound and inorganic tin compound. The present invention also relates to a catalyst system for the preparation of polyester comprising an antimony compound and inorganic tin compound which reduces the polymerization time at all stages of polyester synthesis and reduces the generation of degradation product. This invention further relates to polyester resin with improved L color having significant importance in end-use applications.

Abstract: The present invention relates to a polylactide resin having excellent heat resistance, a preparation method thereof, and a polylactide resin composition including the same. The polylactide resin is characterized by high polymerization activity owing to an organic coordinated metal catalyst even though it has a low catalyst content, and a molecular weight reduction due to thermal decomposition at high temperature and a rate of thermal decomposition including depolymerization are greatly suppressed by a low catalyst content and a low resin acidity, and thus provided is the polylactide resin having superior heat resistance.

Abstract: A method is disclosed herein for the preparation of polytrimethylene terephthalate with sustained-release crystallinity. The method reduces crystallization rate and crystallinity-saturation ratio of polytrimethylene terephthalate during spinning, through addition of a third monomer during the esterification reaction step. The third monomer acts as copolymerization component generating intermolecular steric hindrance; the identity of which selects from one or more as combinations of the following: trimellitic anhydride, non-para aromatic dicarboxylic acid, C4-C10 aliphatic dicarboxylic acid having branched chains or naphthenic group and C3-C10 aliphatic dihydric alcohol having branched chains or naphthenic group, the molar ratio of carboxyl to hydroxyl is 1:1.16˜1.85, with the third monomer constituting 0.5˜6.5% of the total weight of the beginning raw materials.

Abstract: The present invention provides a method for producing a polyester resin, comprising carrying out a hot-water treatment and a heat treatment, in this order, of polyester prepolymer particles obtained by melt polycondensation of a dicarboxylic acid component and a diol component. The hot-water treatment comprises bringing the polyester prepolymer particles with an intrinsic viscosity of from at least 0.10 dL/g to at most 1.0 dL/g and with a density of at most 1.36 g/cm3 into contact with hot water at a temperature higher than the glass transition temperature of the polyester prepolymer particles and less than 100° C., under the condition satisfying the following formula (1): 40?(T?Tg)t?6000??(1) wherein t is a hot-water treatment time (second), T is the temperature of the hot water (° C.) and Tg is the glass transition temperature (° C.) of the polyester prepolymer particles.

Abstract: Disclosed are polylactide resin that may exhibit and maintain excellent mechanical properties, exhibit excellent heat resistance, and thus can be used for a semi-permanent use, a method for preparing the same, and a polylactide resin composition comprising the same. The polylactide resin has a low hydrolysis rate constant of 0.1 day?1 or less and a weight average molecular weight of 100,000˜1,000,000, under specific conditions.

Abstract: The present invention relates to a method for the continuous production of high-molecular polyesters by esterification of dicarboxylic acids and/or transesterification of dicarboxylic acid esters with diols and/or mixtures thereof in the presence of catalysts with formation of a prepolymer in a tower reactor and polycondensation thereof to form a high-molecular polyester in a polycondensation reactor, a prepolymer with >40 to 70 repeat units (DP) being produced in the tower reactor and this prepolymer being polycondensed in only one further reactor to form a polyester with >150 to 205 DP.

Abstract: The present invention relates to an organotin compound represented by R1O—Sn—OR2 (where R1 and R2 are independently a primary, secondary, or tertiary alkyl group having 5 to 30 carbon atoms), a preparation method thereof, and a preparation method for polylactide using the organotin compound. The organotin compound of the present invention is easy to prepare and is used to prepare a polylactide resin having a high molecular weight at a high yield without using a separate initiator.

Abstract: The present invention relates to a method for the continuous production of high-molecular polyesters by esterification of dicarboxylic acids and/or transesterification of dicarboxylic acid esters with diols and/or mixtures thereof in the presence of catalysts with formation of a prepolymer in a tower reactor and polycondensation thereof to form a high-molecular polyester in a polycondensation reactor, a prepolymer with >40 to 70 repeat units (DP) being produced in the tower reactor and this prepolymer being polycondensed in only one further reactor to form a polyester with >150 to 205 DP.

Abstract: An aromatic polyester resin composition, including: a melt-kneaded product of 99-70 wt. parts of an aromatic polyester resin and 1-30 wt. parts (providing a total of 100 wt. parts together with the aromatic polyester resin) of a polyglycolic acid resin, wherein the aromatic polyester resin is an aromatic polyester resin polymerized with a germanium compound (catalyst), and the polyglycolic acid resin is a polyglycolic acid resin obtained by ring-opening polymerization of glycolide. As a result, gas generation during the melt-processing of a composition obtained by adding a relatively small amount of polyglycolic acid resin to an aromatic polyester resin is effectively suppressed to provide an aromatic polyester resin composition with a good gas-barrier property.

Abstract: A method for producing a polyester resin composition C), which comprises melt-kneading a polyester resin (A) which satisfies the following formulae (1), (2) and (3) and a polyester resin (B) which satisfies the following formula (4): P1?10??(1) 0.1?Ge1?1.5??(2) 0.001?Ge1/P1?0.15??(3) 0?P2/Ti1?80??(4) provided that in the formulae (1), (2) and (3), P1 is the content (mol) of phosphorus atoms and Ge1 is the content (mol) of germanium atoms, per ton of the polyester resin (A), and in the formula (4), P2 is the content (mol) of phosphorus atoms and Ti1 is the content (mol) of titanium atoms, per ton of the polyester resin (B). A polyester resin composition (C) obtained by the method, and a molded product such as a film made from such a composition are also provided.

Abstract: The present invention relates to an improved method for the esterification of terephthalic acid with 1,4-butanediol, an improved method for the manufacture of polybutylene terephthalate as well as reactors and devices that are suited for the application in this method.

Abstract: The invention provides methods and systems for manufacturing low-acid polyalkylene terephthalate, for example, polybutylene terephthalate (PBT). The invention also provides methods and systems for preparing macrocyclic polyester oligomer (MPO) from low-acid polyalkylene terephthalate. Finally, the invention provides methods and systems for preparing MPO via reaction of a diol and a dialkyl ester in an organic solvent to form non-isolated, low-acid polyalkylene terephthalate which undergoes cyclization (depolymerization) to form MPO.

Abstract: A polymer containing a polyester polymer unit having the formula -(I-III-II)-, wherein III is derived form a di-carboxylic acid, wherein I is derived from 1,3 cyclohexanedimethanol, wherein II is derived from 1,4 cyclohexanedimethanol and wherein the polymer is a solid at room temperature.

Abstract: Compositions of matter including articles derived from (a) from 5 to 99.99 wt % of a modified polybutylene terephthalate random copolymer that (1) is derived from polyethylene terephthalate and (2) contains a at least one residue derived from polyethylene terephthalate selected from the group consisting of antimony, germanium, diethylene glycol groups, isophthalic acid groups, cis isomer of cyclohexane dimethanol, trans isomer of cyclohexane dimethanol, sodium benzoate, alkali salts, napthalane dicarboxylic acids, 1,3-propane diols, cobalt, cobalt-containing compounds, and combinations thereof, and (b) from 0.01 to 95 wt. % of a member selected from the group consisting of (1) fillers, (2) a carboxy reactive component, (3) polyethyelene terephthalate, (4) a component including a polycarbonate and an impact modifier. The articles may be derived from various conversion processes, e.g., injection molding processes, extrusion processes, thermoforming processes, melt-blown process.

Abstract: A composition comprising a polytrimethylene terephthalate random copolymer that (1) is derived from polyethylene terephthalate component selected from the group consisting of polyethylene terephthalate and polyethylene terephthalate copolymers and (2) contains at least one residue derived from the polyethylene terephthalate component. Methods for making such copolymers and articles made from such copolymers.

Abstract: The present invention relates to a process for making polyester compositions containing: (I) at least one polyester which comprises: (a) a dicarboxylic acid component comprising: (i) 70 to 100 mole % of terephthalic acid residues; (ii) 0 to 30 mole % of aromatic dicarboxylic acid residues having up to 20 carbon atoms; and (iii) 0 to 10 mole % of aliphatic dicarboxylic acid residues having up to 16 carbon atoms; and (b) a glycol component comprising: (i) 1 to 99 mole % of 2,2,4,4-tetramethyl-1,3-cyclobutanediol residues; and (ii) 1 to 99 mole % of cyclohexanedimethanol residues; and (II) at least one thermal stabilizer chosen from at least one phosphorus compound, reaction products thereof, and mixtures thereof; wherein the total mole % of the dicarboxylic acid component is 100 mole %, and wherein the total mole % of the glycol component is 100 mole %; wherein the inherent viscosity of the polyester is from 0.35 to 1.2 dL/g as determined in 60/40 (wt/wt) phenol/tetrachloroethane at a concentration of 0.

Abstract: A polytrimethylene terephthalate resin comprising 60 to 100 mole % of (a) trimethylene terephthalate recurring units, and 0 to 40 mole % of (b) at least one monomer unit obtained from a comonomer copolymerizable with at least one of the monomers used for forming the recurring units, the total molar amount of (a) monomer units and (b) monomer units being 100 mole %, and the resin having the following characteristics (A) to (D): (A) an intrinsic viscosity [?] of from 0.6 to 4 dl/g; (B) a molecular weight distribution (Mw/Mn) of from 2 to 2.7; (C) a cyclic dimer content of not greater than 2% by weight; and (D) a psychometric lightness L-value of from 70 to 100 and a psychometric chroma b*-value of from ?5 to 25.

Abstract: A process comprises heating at a first temperature under an inert atmosphere and at a first pressure of at least 101 kPa a cyclohexanedimethanol, and a polyethylene terephthalate component selected from the group consisting of polyethylene terephthalate and polyethylene terephthalate copolymers, to form a molten mixture; and heating the molten mixture with agitation at a second temperature higher than the first temperature and a second, subatmospheric pressure for a time and under conditions effective to form a modified polycyclohexane dimethylene terephthalate copolymer comprising at least one residue derived from the polyethylene terephthalate component.

Abstract: A novel macromer or mixture thereof is described herein, comprising benzoyl isocyanate terminal moieties and at least two residues of a water-soluble polymer having a molecular weight ranging from 80 to 10,000 adjacent to the carbonyl group of the benzoyl isocyanate moieties, thereby forming at least two ester linkages in the macromer or mixture thereof. A method for making a diisocyanate macromer is also described herein.

Abstract: Processes for feeding catalyst systems to a melt phase process for the manufacture of polyester polymers, and more particularly, to split catalyst solution feeds to the melt phase process to provide the target amount and ratio of catalyst metals.

Abstract: The invention relates to a process for preparing lactic acid polymers of highly crystallinity and molecular weight, the process comprising melt polymerization of a lactide to form prepolymers having active end groups followed by solid state polymerization. The polymerization is carried out in the presence of a catalyst complex comprising a lactide, an organic metal-oxo compound and a lactic acid oligomer. The residual lactide after the melt polymerization is removed by heating the reaction mixture in the temperature range of 98° C. to a temperature less than the melting point of the prepolymer. The metal to oligomer ratio in the catalyst complex is in the range of 0.1 to 10, preferably in the range of 0.5 to 5, more preferably in the range of 0.8 to 1.

Abstract: A polycarbonate-polyester block copolymer includes a polycarbonate block and a polyester block, each having specific structures. The block copolymer can be prepared, at least in part, from renewable feedstocks. In some forms, the block copolymer includes biodegradable segments that facilitate structural breakdown of objects molded from the block copolymer. Methods of preparing the block copolymer are described as are compositions that include it and articles prepared from it.

Abstract: A polyester resin that can be beneficially employed as one finding application in deactivation of polycondensation catalysts for polyester production and suppression of forming of acetaldehyde and other aldehydes and cyclic ester oligomers at molding stage. In particular, there is provided a polyester resin composed mainly of an aromatic dicarboxylic acid component and a glycol component wherein a phosphorus compound is incorporated through copolymerization or blending in an amount of 100 to 10,000 ppm in terms of phosphorus element, characterized in that the contents of Zn element, Fe element, Ni element and Cr element are not greater than specified values.

Abstract: The invention pertains to low profile additives (“LPA”) comprising branched polymers having a weight average molecular weight (Mw) of at least about 20,000 grams/mole and a number average molecular weight (Mn) of at least about 3,000 grams/mole and methods for making the LPAs. The invention further concerns compositions comprising LPAs synthesized from one or more difunctional monomers and one or more branching agents. Also, disclosed are thermosettable resinous compositions and molded articles comprising the LPAs.

Abstract: The present invention relates to metal/organic complexes of Formula (I), (II), (III), (IV), (V) and (VI) that are useful as catalysts for the polymerisation of carbonyl-containing or cyclic monomers. Typical polymerisation reactions are, for example, those of lactides. R is independently selected at each occurrence from the group comprising: hydrogen, hydrocarbyl and substituted hydrocarbyl, M is a Lewis-acidic metal, and, if present, X is any suitable counter ion.

Abstract: The present invention provides carboxy-terminated oligomeric polyester compositions useful in the preparation of “weatherable” polymeric materials, for example weatherable copolyestercarbonates. In one aspect the present invention provides an oligomeric polyester composition comprising structural units derived from at least one diacid, at least one diaryl carbonate and at least one diol. The structural units derived from the diacid are present in a molar excess of from about 10% to about 40% based on a ratio of moles of diacid-derived structural units to moles of diol-derived structural units present in the oligomeric polyester composition. The oligomeric polyester composition is further characterized by the presence of at least some phenoxy end groups.

Abstract: Ultrahigh molecular weight polyethylene compositions of highly beneficial sintering characteristics are disclosed and methods for making and processing same. Additionally, products comprising these compositions are described.

Abstract: A random amorphous copolyester is provided. The copolyester of the invention is synthesized by using diacid monomers and diol monomers. The random amorphous copolyester has a structure of the formula (I): wherein R1, R2 is an aromatic or aliphatic monomer, and wherein A, B, C, D, E and F are numbers of repeating units, A is 0-0.8, B is 0-0.8, C is 0-1, D is 0-1, E is 0-0.8, F is 0-0.8, C+D>0.2 and A+B+E+F<0.8. The diacid monomer comprises TPA and an aromatic or aliphatic diacid monomer, the diol monomer comprises EG, 1,3 and 1,4-CHDM, and an aromatic or aliphatic diol monomer.

Abstract: Processes for making elastomeric polyether esters from polyesters and polyols are provided. The processes can offer a reduction in manufacturing cost, energy use and a lower environmental footprint than conventional processes, particularly when the processes utilize post-consumer polyesters as starting materials.

Abstract: The present invention relates to a process for the preparation of branched biodegradable polymers comprising of the steps of: (a) preparing a macromonomer by ring-opening polymerization of at least one cyclic ester, cyclic carbonate, and/or cyclic carboxyanhydride in the presence of a branching agent and optionally a catalyst; and (b) subsequent polycondensation of the macromonomer, to a process for the preparation of a macromonomer by ring-opening polymerization of at least one cyclic ester, carbonate and/or N-carboxyanhydride in the presence of a defined branching agent and optionally a catalyst, according to step (a), and to the prepared macromonomer and branched biodegradable polymer and their uses.

Abstract: The present invention is a method for efficiently incorporating a nitrogen containing methine light absorber into a polyester resin. The method includes forming a reaction mixture comprising combining a diol component, a diacid component selected from the group consisting of dicarboxylic acids, dicarboxylic acid derivatives, and mixtures thereof, an antimony containing compound, a phosphorus containing compound, a metal containing compound, and a nitrogen containing methine light absorber. The reaction mixture is polymerized in a polycondensation reaction system. In another embodiment the light absorber is added while the reaction products of one reactor are being transferred to the next reactor in the polycondensation reaction system. The present invention is also directed articles made from the polyester resin.