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Polyester melt phase compositions having improved thermo-oxidative stability and methods of making and using same

A technology of composition and polyester, applied in the field of polyester composition, can solve the problems of PET oxidation stability reduction, molecular weight reduction, etc.

Inactive Publication Date: 2011-12-21
GRUPO PETROTEMEX DE C V
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the oxidative stability of PET produced by this method may be reduced and may cause a breakdown in molecular weight when the PET is exposed to air at a temperature of about or above 165°C
This is a problem because PET must be dried before processing, and drying of PET is usually done above 165°C

Method used

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  • Polyester melt phase compositions having improved thermo-oxidative stability and methods of making and using same
  • Polyester melt phase compositions having improved thermo-oxidative stability and methods of making and using same
  • Polyester melt phase compositions having improved thermo-oxidative stability and methods of making and using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-6

[0085] Oligomer Synthesis: Polyethylene terephthalate oligomers were prepared from terephthalic acid and fresh ethylene glycol, and in some cases purchased from Aldrich Chemical Company (Part# 301353 , [1141-38-4]), or together with isophthalic acid or cyclohexanedimethanol as described below. An aqueous mixture of tetramethylammonium hydroxide (TMAH) in water was added to each batch to reduce the amount of diethylene glycol formed during the esterification reaction. The TMAH was purchased from Aldrich Chemical Company (part#328251, [75-59-2]) and diluted 1 part in 10 parts distilled water before use. In each case, all raw materials were mixed together in a 2 liter polyethylene beaker and then added to a Parr high pressure reactor. A control oligomer containing 2 mol % isophthalate modification was also prepared from BP-Amoco's isophthalic acid starting material. Another control oligomer was prepared comprising Eastman cyclohexanedimethanol starting material.

[0086] Typic...

Embodiment 7 and 8

[0102] Resin Blending (Examples 7 and 8): The resins were blended using a Sterling extruder with a 1.5 inch diameter general purpose screw rotating at 100 rpm. Zone 1 of the extruder was set at 260°C. Zones 2 and 3 are set to 280°C. The mold is 260°C. The polyethylene naphthalate polymer used for blending contained 8 mol % terephthalic acid moieties based on the total diacid, which was dried at 160° C. in air for 18 hours prior to extrusion. hours, and the polyethylene terephthalate sample contained 9 ppm Li and 12 ppm Al as catalyst residue, which was dried in air at 150° C. for 8 hours before extrusion. Sample 7 is an extruded polyethylene terephthalate control only. Sample 8 is a blend of 29.70 lbs polyethylene terephthalate resin and 0.30 lbs lightly modified polyethylene naphthalate resin prepared based on total diacid monomer A polymer containing 1 mol% of 2,6-naphthalene dicarboxylic acid monomer. Examples 7 and 8 were in the form of cylindrical pellets.

[0103] ...

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Abstract

The disclosed polyester compositions include a melt phase polyethylene terephthalate polyester having incorporated therein a monomer residue having two or more fused aromatic rings, and further including aluminum and optionally an alkali metal or rare earth metal. Articles comprising the disclosed polyester compositions are also disclosed, as well as methods of preparing such polyester compositions comprising the steps of: A mixture of acids and monomers having two or more fused aromatic rings; and reacting the mixture in the presence of aluminum and optional alkali metals or alkaline earth metals to obtain said molten phase polyterephthalene Ethylene glycol formate polyester.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS [0002] This application claims priority to US Provisional Application No. 61 / 098,060, filed September 18, 2008, the disclosure of which is incorporated herein by reference in its entirety. technical field [0003] The present invention relates to polyester compositions, and more particularly, to polyester compositions comprising melt-phase polyethylene terephthalate polyesters having incorporated therein Monomer residues with more than two fused aromatic rings. Background technique [0004] Certain polyester compositions suitable for molding are suitable for use in packaging materials, such as in the preparation of beverage containers. For example, some poly(ethylene terephthalate) polymers ("PET") are suitable for this purpose, and PET has become popular for its brightness, clarity, and chemical inertness. [0005] PET is typically prepared in a two-stage process, starting with a melt phase stage followed by a solid state s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/183C08G63/187C08G63/85
CPCC08G63/83C08G63/189C08G63/84C08G63/187C08G63/183C08G63/78C08K3/08C08L67/03
Inventor 贾森·克里斯托弗·詹金斯丹尼斯·爱德华·布里基小厄尔·埃德蒙森·豪厄尔卡罗尔·朱利亚德·格林
Owner GRUPO PETROTEMEX DE C V