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Oxygen-scavenging resin and container having low haze

An oxygen scavenging and resin technology, applied in the field of making and oxygen scavenging resin compositions, can solve the problems of lack of transparency, dark bottle color and high haze value

Inactive Publication Date: 2004-12-22
MULTISORB TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These bottles often have high haze values, lack clarity and the bottles are very dark

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1-26

[0116] PET copolymer resins were prepared by the method disclosed in US Patent No. 5,612,423, the entire contents of which are incorporated herein by reference. Obtain iron particle samples with different particle sizes. Hydrogen reduced sponge iron from Pyron was used in Examples 1-10. Carbonyl iron powder obtained from ISP Technologies was used in Examples 11-26. Therefore, the iron particles used in Example 3 had a particle size ranging from about 25 to about 38 μm. It should be understood that such samples may be obtained, for example, by screening. Iron particles were added to the polyester resin using a twin-screw extruder metering feeder to obtain a resin masterbatch (iron-containing resin composition) containing 2.5% by weight of iron. Blend this masterbatch with the base resin to achieve the desired concentration. The base resin / iron mixture was vacuum dried at 325°F (163°C) for 18 hours. The dried resin was transferred to the Novotec drying hopper of a Nissei AS...

Embodiment

[0124] Example No. Fe Concentration Particle Size Optimum Reheat Time Haze (%)

[0125] (ppm) (μm) (sec)

[0126] 1 0 - 43 1.5

[0127] 2 1250°25 49 7.56

[0128] 3 1250 25-38 49 4.53

[0129] 4 1250 38-45 52 4.58

[0130] 5 1250 45-75 52 4.41

[0131] 6 0 - 43 1.5

[0132] 7 2500 °25 46 14.08

[0133] 8 2500 25-38 46 9.13

[0134] 9 2500 38-45 46 8.45

[0135] 10 2500 45-75 40 8.56

[0136] Iron Particles and L in Stretched Polyester Film Compositions * value

[0137] Table 2

[0138] Examples Fe Concentration Particle Size (μm) Particle Number Optimum Reheat Haze (%) L * relative control

[0139] No. (ppm) (×10 6 ) / cm 3 Time (sec) matter per mil

[0140] Polymer L * Change

[0141] change

[0142] 11 0 - 0 43 1.5 90.89 N.A.

[0143] 12 100 3.23 0.372...

preparation Embodiment 27-32

[0159] Examples 28 to 33 are stretched film samples prepared as above. Example 27 is a control that does not contain oxygen scavenging particles. The results are listed in Table 3. The type of iron used in Examples 28-29 was hydrogen reduced sponge iron with a volume based geometric mean particle size of about 11.96 μm. The type of iron used in Examples 30-11 was unannealed electrolytic iron with a volume based geometric mean particle size of about 17.41 μm. The iron used in Examples 32-33 was carbon monoxide reduced sponge iron with a volume based geometric mean particle size of about 18.61 μm. Although the concentration of iron in the polymer (ppm weight) is equivalent, the number of particles per cubic centimeter of polymer increases with the decrease of particle size, and relative to the control, the transmission per mil film thickness of Hunter L * Changes also increased. It should be noted that for Examples 27-33, L * Assays are performed using whole vials. Compari...

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PUM

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Abstract

A resin composition providing good optical properties after stretching and effective oxygen scavenging comprises a film-forming polyester and an effective amount of oxygen scavenging particles having a selective particle size distribution. A container provides efficient oxygen scavenging while having a high L* color. The container has at least one wall, wherein the wall comprises an accumulation region, wherein the accumulation region comprises a film-forming polymer and a population of particles comprising an effective amount of oxygen scavenging particles, wherein the amount of oxygen scavenging particles does not exceed a concentration of about ( 1 x 107 particles÷T) / cubic centimeter of polymer, where T is the thickness of the accumulation zone expressed in mils; and the transmittance HunterL* of the walls changes by less than about 0.4 / mil container wall.

Description

Background of the invention [0001] Thermoplastic resins such as polyethylene terephthalate (PET) are commonly used in the production of packaging materials. Processing of PET under reasonable conditions produces high strength articles with excellent gas barrier properties. Food, drink, and medicines may spoil or be damaged if exposed to oxygen. Therefore, in order to improve the storage shelf life and taste retention of products such as food, beverages and pharmaceuticals, the barrier protection provided by PET is often added with several layers of packaging materials or oxygen scavengers. [0002] The addition of a barrier film layer is considered passive barrier packaging. For example, ethylene vinyl alcohol (EVOH), polyvinylidene chloride (PVDC) and nylon MXD6 films are commonly used for this purpose due to their excellent oxygen barrier properties. However, the use of different materials for the various layers is not preferred as this increases the cost of package const...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B65D1/34B65D1/00B65D30/02B65D65/02B65D65/40C08G63/78C08J3/22C08J5/00C08K3/00C08K3/08C08K3/22C08K3/34C08K9/00C08L67/02
CPCC08K3/22C08K3/34Y10T428/1352Y10T428/1355Y10T428/1359Y10T428/1397B29C48/023B29C48/288B29C55/02C08J3/203C08J2367/02C08K3/08C08K2201/005C08L67/02C08K3/10
Inventor D·董E·斯森R·莱康拜
Owner MULTISORB TECH INC
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