PET copolymer composition with enhanced mechanical properties and stretch ratio, articles made therewith, and methods

a technology of mechanical properties and stretch ratio, applied in the field of preforms and their containers, can solve the problems of reducing wasting resources and energy, and difficulty in achieving source reduction, so as to improve the utilization rate of materials, improve shelf life, and improve mechanical properties

Inactive Publication Date: 2005-06-02
THE COCA-COLA CO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0018] The cycle time for making the container is reduced as compared to a second cycle time for making a second container comprising a poly(ethylene terephthalate) resin having comonomer modification greater than about 2.2 mole percent of a combination of a non-ethylene glycol diol component and a non-terephthalic acid diacid component.
[0019] Thus, embodiments of this invention provide two sets of improvements. In one set, the PET Copolymer is used with a...

Problems solved by technology

Source reduction saves resources and energy; however, with PET additional source reduction is difficult to achieve, because of the physical performance requirements necessary for the major applications for this polymer.
For large sized containers, the amount of material utilization is already high, and further increases offer limited opportunity for source reduction.
However, there is a significant cost associated with increasing the preform stretch ratio.
Increasing the preform stretch ratio necessarily means increasing the wall thickness of the preform, which adversely impacts injection molding and blow molding cycle times. This consequently consumes more energy and increases the capital and operating cost for making PET containers.
This approach inherently sacrifices the mechanical integrity of the container, since sidewall rigidity relates to the second power of the thickness.
Although in principle the sidewall rigidity of a...

Method used

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  • PET copolymer composition with enhanced mechanical properties and stretch ratio, articles made therewith, and methods
  • PET copolymer composition with enhanced mechanical properties and stretch ratio, articles made therewith, and methods

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0058] Different PET resins were injection molded with a lab-scale Arburg 75 unit cavity injection machine into conventional preform molds with a stretch ratio about 12.3 but with different gram weights. Resins were pre-dried to moisture levels below 30 parts per million (ppm). The preforms were then stretch blow molded with a SBO-1 stretch blow-molding machine into 500 ml Coca-Cola Contour bottles. A description of the weights and compositions of the samples is listed in Table 1. The #3 Samples are representative of embodiments of the present invention and the #1 and #2 Samples are comparative.

TABLE 1GramDEGNDCIPASampleweightmole %mole %mole %#1-27272.8903#2-27271.4502.5#3-27271.450.50#1-26262.8903#2-26261.4502.5#3-26261.450.50#1-24242.8903#2-24241.4502.5#3-24241.450.50

example 2

[0059] The containers produced in Example 1 were subjected to a standard thermal stability test, which involves filling the containers with carbonated water, holding them at 22 deg C. for 24 hours, subjecting them to a temperature of 38 deg C. for an additional 24 hours, and then measuring the dimensional changes that occurred relative to the unfilled containers. The data in Table 2 shows that low DEG, low NDC PET Copolymers of the #3 Samples from Example 1 have increased thermal stability property for pressurized containers over that of the comparable Samples #1 and #2, as evidenced by lower thermal expansion results. The 24 gram Sample #3 exhibits enhanced thermal stability compared to the 27 gram Sample #1 control.

TABLE 2Label DiameterPinch DiameterSampleExpansion (%)Expansion (%)#1-273.15.4#2-272.65.6#3-272.34.8#1-263.25.4#2-263.97.5#3-262.75.4#1-243.65.8#2-242.44.9#3-242.64.7

example 3

[0060] In Example 3, containers made in Example 1 were tested for sidewall rigidity using a sidewall deflection test. The sidewall deflection test is designed to measure the amount of force required to deflect the label panel of PET bottles 12 mm (0.47″) with an 8 mm (0.32″) round tip probe at a cross-head speed of 508 mm / min. This measurement gives information about the rigidity of the container. The greater the force required to achieve a specific sidewall deflection, the greater the rigidity of the bottle sidewall.

[0061] The data in Table 3 shows that the low DEG, low NDC PET Copolymers of the #3 Samples from Example 1 have increased sidewall rigidity over that of the comparable Samples #1 and #2. The sidewall rigidity of the 24 gram sample #3 is equivalent to 27 gram sample #1 control.

TABLE 3SidewallDeflectionSample(Kgf.)#1-274.87#3-275.36#2-275.35#1-264.25#3-264.67#2-264.53#1-244.14#3-244.80#2-244.50

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Abstract

A container is made from a preform comprising a PET Copolymer comprising a diol component having repeat units from ethylene glycol and a non-ethylene glycol diol component and a diacid component having repeat units from terephthalic acid and a non-terephthalic acid diacid component. The total amount of non-ethylene glycol diol component and non-terephthalic acid diacid component is present in the poly(ethylene terephthalate) copolymer in an amount from about 0.2 mole percent to less than 2.2 mole percent. The container is useful in packaging beverages and corresponding methods are disclosed.

Description

CROSS REFERENCE TO RELATED APPLICATION [0001] This application claims priority Under 35 U.S.C. §119 to U.S. provisional patent application Ser. No. 60 / 423,221 filed on Nov. 1, 2002.FIELD OF THE INVENTION [0002] This invention relates to preforms and their containers made with poly(ethylene terephthalate)-based resin compositions that possess low levels diol and acid modification, such as naphthalenedicarboxylic acid and diethylene glycol. More particularly, this invention relates to low stretch ratio preforms and their containers, which exhibit enhanced mechanical properties relative to containers made using conventional poly(ethylene terephthalate)-based resin compositions. BACKGROUND OF THE INVENTION [0003] Poly(ethylene terephthalate)-based resins, which are commonly referred to in the industry simply as “PET” even though they may and often do contain minor amounts of additional components, have widely been used to make containers for carbonated soft drink, juice, water and the l...

Claims

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Application Information

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IPC IPC(8): B29C49/00B29C49/06B65D1/02C08G63/183C08G63/672
CPCB29B2911/14593Y10T428/1352B29B2911/14713B29B2911/14906B29B2911/1498B29B2911/14986B29C49/0005B29C49/06B29K2067/00B29K2105/253B29K2667/00B29K2995/0017B29K2995/004B29K2995/0041B29K2995/0067B29K2995/0077B29L2031/565B29L2031/7158B65D1/0207C08G63/183C08G63/672B29B2911/1402B29B2911/14026B29B2911/14033B29B2911/1404B29B2911/14106B29B2911/14133B29B2911/14653B29C2949/26B29C2949/28B29C2949/24B29C2949/22B29C2949/3024B29C2949/3032B29C2949/0811B29C2949/082B29C2949/0829B29C2949/0862B29C2949/0872B29C49/42394B29C2049/023B29C2949/0715B29C49/087B29C2049/7879
Inventor SHIRULE, MARKKJORLAUG, CHRISTOPHER C.ANTHONY, LINDA K.MILTON, THOMAS H.
Owner THE COCA-COLA CO
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