The invention is a novel method for the late introduction of additives into condensation polymers. The method employs a reactive carrier that functions as a delivery vehicle for one or more additives. The reactive carrier reacts with the condensation polymers, thereby binding the reactive carrier in the polymer resin and preventing the emergence of the reactive carrier from the polymer resin during subsequent thermal processing.

Methods of post-polymerisation extruder injection in condensation polymer production

A method for decreasing acetaldehyde content of melt processed polyester comprising combining with polyester an organic additive compound that scavenges acetaldehyde from polyester. The organic additive compound comprises at least two component molecular fragments, each component molecular fragment comprising at least two hydrogen substituted heteroatoms bonded to carbons of the respective component molecular fragment. Each component molecular fragment is reactive with acetaldehyde in the polyester to form water and a resulting organic compound comprising an unbridged five or six member ring including the at least two heteroatoms. The reduced acetaldehyde content polyester is particularly useful for making containers such as for packaging beverages.

Method to decrease the acetaldehyde content of melt-processed polyesters

The invention is a novel method for the late introduction of additives into polyethylene terephthalate. The method employs a reactive carrier that functions as a delivery vehicle for one or more additives. The reactive carrier reacts with the polyethylene terephthalate, thereby binding the reactive carrier in the polyethylene terephthalate resin and preventing the emergence of the reactive carrier and additives from the polyethylene terephthalate during subsequent thermal processing.

Methods of post-polymerization extruder injection in polyethylene terephthalate production

The present invention relates to slow-crystallizing polyethylene terephthalate resins that possess a significantly higher heating crystallization exotherm peak temperature (TCH) as compared with those of conventional antimonycatalyzed polyethylene terephthalate resins. The polyethylene terephthalate resins of the present invention are especially useful for making hot-fill bottles having exceptional clarity.

Slow-crystallizing polyester resins

The invention is a method for the late introduction of additives into polyethylene terephthalate. The method employs a reactive carrier that functions as a delivery vehicle for one or more additives. The reactive carrier reacts with the polyethylene terephthalate, thereby binding the reactive carrier in the polyethylene terephthalate resin and preventing the emergence of the reactive carrier and additives from the polyethylene terephthalate during subsequent thermal processing.

Methods for the late introduction of additives into polyethylene terephthalate

The invention relates to a method for producing polyesters with a reduced content of free acetaldehyde from terephthalic acid and ethylene glycol via a catalyzed polycondensation in the melt and also the use of this method. The method is based thereby on the usage of highly active polycondensation catalysts, on the deactivation of these catalysts by the addition of phosphorous-containing inhibitors and the addition of acetaldehyde-bonding substances. The entire polycondensation is thereby implemented at temperatures beneath 280° C.

Method for producing polyesters with a reduced content of free acetaldehyde

Process for production polyester with low content of free aldehyde

The production of polyester with a reduced content of free acetaldehyde involves melt-polycondensation of terephthalic acid and ethylene glycol at below 280 degrees C with (a) addition of catalyst before polycondensation, (b) deactivation of catalyst when the intrinsic viscosity of the melt reaches 0.63-1.00 and (c) addition of acetaldehyde-binder in excess. A method for the production of polyester with a reduced content of free acetaldehyde by melt-polycondensation of terephthalic acid and ethylene glycol involves (a) adding the catalyst before polycondensation, (b) adding an inhibitor to deactivate the catalyst when the intrinsic viscosity (I.V.) of the melt reaches 0.63-1.00 (without solid-phase post-condensation) and (c) then adding excess acetaldehyde-binding substance, the entire polycondensation being carried out at below 280 degrees C.

Process for the preparation of polyesters having reduced content of free acetaldehyde

Die Erfindung betrifft ein Verfahren zur Herstellung von Polyestern mit reduziertem Gehalt an freiem Acetaldehyd aus Terephthalsaure und Ethylenglykol uber eine katalysierte Polykondensation in der Schmelze sowie die Verwendung dieses Verfahrens. Das Verfahren basiert dabei auf dem Einsatz hochaktiver Polykondensationskatalysatoren, der Desaktivierung dieser Katalysatoren durch Zusatz phosphorhaltiger Inhibitoren und dem Zusatz von Acetaldehyd bindenden Substanzen. Die gesamte Polykondensation wird dabei bei Temperaturen unterhalb von 280 DEG C durchgefuhrt.

Verfahren zur Herstellung von Polyestern mit reduziertem Gehalt an freiem Acetaldehyd

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Method for producing polyesters with a reduced content of free acetaldehyde

Process for production polyester with low content of free aldehyde

Process for the preparation of polyesters having reduced content of free acetaldehyde

Verfahren zur Herstellung von Polyestern mit reduziertem Gehalt an freiem Acetaldehyd