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Aluminum containing polyester polymers having low acetaldehyde generation rates

A polymer, yield technology, applied in the field of polyester polymer

Active Publication Date: 2008-09-17
GRUPO PETROTEMEX DE C V
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, there are also certain quality issues associated with making polyester entirely in the melt phase

Method used

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  • Aluminum containing polyester polymers having low acetaldehyde generation rates
  • Aluminum containing polyester polymers having low acetaldehyde generation rates
  • Aluminum containing polyester polymers having low acetaldehyde generation rates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0277] All high intrinsic viscosity (IV) polyesters in the examples were made entirely in the melt phase, i.e., the molecular weight of the polyester melt phase product, as indicated by its intrinsic viscosity (IhV or ItV) , not improved in the solid state.

[0278] A commercially available polyester supplied as CB-12 by Eastman Chemical Company was measured each time the acetaldehyde production test was performed on the test samples. Levels of acetaldehyde in preforms made from CB-12, a polymer made under typical manufacturing conditions and subjected to solid state polymerization, are considered acceptable for carbonated soft drink use. Using the results of acetaldehyde generation in this commercially available polyester as a benchmark: where the acetaldehyde generation rate is less than or equal to that of the commercially available CB-12 pellets, it is expected to give acceptable preforms for carbonated soft drink applications Acetaldehyde levels.

[0279] Some water app...

Embodiment 1

[0362] The Sb solution described in Comparative Example 1 was used here. For each type of catalyst system, catalyst level and temperature combination, the finisher time from the torque terminated test batch in Comparative Example 1 will be the finisher time used in this example (stage 12 time) . The same oligomers and procedures were used as described in the Introduction incorporated into the Examples section. The lithium and aluminum solutions used are described in Comparative Example 1. The catalyst target values ​​in samples 159 and 166 were about 23 ppm each of Li and Al. The catalyst target values ​​in samples 161 and 154 were about 46 ppm each of Li and Al. The target value for the lithium / aluminum molar ratio ("Li:Al MR") in Table 2 is 4 for all Li / Al test batches. The target value for phosphorus is 0 or 120 ppm.

[0363] For the Li / Al test batches in Table 2 with a phosphorus target of 120 ppm, the oligomeric phosphate triester with about 9 wt% phosphorus was adde...

Embodiment 2

[0382] The same array and oligomeric phosphotriesters as described in Example 1 were used. For each combination of type catalyst system, catalyst level and temperature, the finisher time from the torque off test batch in Comparative Example 2 will be the finisher time used in this example. The same lithium and aluminum solutions as described in Comparative Example 2 and Comparative Example 1, respectively, were used. The oligomers used and the procedure are described in the Introduction to the Examples section. The antimony solution used is described in Comparative Example 1.

[0383] The data are shown in Table 4. The target value for the lithium to aluminum molar ratio ("Li:Al MR") was 4 for all Li / Al test batches in Table 4. The target values ​​for the catalyst are about 11.5 ppm each of Li and Al, about 28.5 ppm each of Li and Al, or about 45.5 ppm each of Li and Al. Phosphorus target values ​​were 0, 120 or 240 ppm.

[0384] Table 4

[0385]

sam...

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Abstract

A polyester polymer composition containing polyester polymers such as polymers having repeating ethylene terephthalate units, aluminum atoms in an amount of at least 3 ppm based on the weight of the polymer, the polyester polymers having an It.V. of at least 0.72 dL / g obtained through a melt phase polymerization and a residual acetaldehyde level of 10 ppm or less. Also provided are polyester polymer compositions containing polyester polymers and: (i) aluminum atoms (ii) alkaline earth metal atoms or alkali metal atoms or alkali compound residues, and (iii) a catalyst deactivator such as a phosphorus compound. The phosphorus compound is added to the polyester melt either late in the polycondensation or upon remelting a solid polyester polymer. The polyester polymer exhibits good L* brightness, clarity, and low levels of acetaldehyde generated upon melting.

Description

1. Field of invention [0001] The present invention relates to polyester polymers containing repeating units of esters derived from diols and aromatic dicarboxylic acids, particularly aluminum atom-containing polymers in which a catalytic deactivator such as a phosphorus compound is added later to provide products with low acetaldehyde content. ester polymer. 2. Background technology [0002] There are 2 types of acetaldehyde (AA) to be concerned about. The first is residual or free AA contained in pellets or granules sent to the preformer molder. The second type AA is the AA produced when the preform AA or PET pellets are melt processed to make bottle parisons. AA precursors in the pellets can convert to AA upon melting and produce unacceptable levels of AA in the parison. Melt processing also generates more AA precursors, which may also release AA. Acetaldehyde has a distinct taste and can be detected by human taste buds at low levels. Unacceptably high levels of AA in...

Claims

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Application Information

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IPC IPC(8): C08G63/02C08K5/00
Inventor M・T・杰尔尼根R・S・阿门特罗特K・L・维内特B・R・德布勒因
Owner GRUPO PETROTEMEX DE C V
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