Oxygen-scavenging resin containers

A technology for oxygen scavenging and container application in polyethylene, polyacrylic acid, low-haze containers, film-forming oxygen-scavenging polyester resin compositions, and vinyl acetate fields, which can solve the problems of lack of transparency, dark bottle color, and haze value advanced questions

Inactive Publication Date: 2006-06-21
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,

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1-26

[0117] The PET copolymer resin is prepared by the method disclosed in U.S. Patent No. 5,612,423, the entire content of which is incorporated herein by reference. Obtain samples of iron particles with different particle sizes. Hydrogen-reduced sponge iron purchased 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 have a particle size range of about 25 to about 38 μm. It should be understood that such samples can be obtained by, for example, screening. A twin-screw extruder metering feeder was used to add iron particles to the polyester resin to obtain a resin master batch (iron-containing resin composition) containing 2.5% by weight of iron. Blend this masterbatch with the base resin to obtain the desired concentration. The base resin / iron mixture was vacuum dried at 325°F (163°C) for 18 hours. Transfer the dried resin to the Novotec drying hopper of the Nissei ASB 5...

preparation Embodiment 27-32

[0128] Examples 28 to 33 are stretched film samples prepared as described 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 is hydrogen-reduced sponge iron with a volume-based geometric average particle size of about 11.96 μm. The type of iron used in Examples 30-11 is unannealed electrolytic iron with a volume-based geometric average particle size of about 17.41 μm. The iron used in Examples 32-33 was sponge iron reduced by carbon monoxide, and the volume-based geometric average particle size was about 18.61 μm. Although the concentration of iron in the polymer (ppm by weight) is equivalent, the number of particles per cubic centimeter of polymer increases with the decrease of the particle size, and compared to the control, the transmission Hunter L per mil film thickness * The changes have also increased. It should be noted that for Examples 27-33, L * The entire bottle is ...

preparation Embodiment 34-48

[0132] In order to study the optimal concentration of particles of different sizes in the unstretched resin, a Haake blender was used to prepare the film. Weigh 2500.0 g HiPERTUF89010 copolyester resin into several 1-gallon containers, and dry them overnight at about 100°C in a vacuum oven with full vacuum. The vacuum state is restored to a nitrogen atmosphere under atmospheric pressure. Weigh an appropriate amount of carbonyl-type iron powder prepared by ISP Technologies in a nitrogen atmosphere, and put them into several vials to obtain the required different concentrations. The nominal particle size range provided by the supplier is about 7 to about 9 μm. The volume-based geometric average particle size of the iron powder is about 7.819 μm. Immediately before removing the hot resin from the oven, iron was added to the resin, each vial was sealed, and the mixture was blended in a roller mill for about 5 minutes.

[0133] The blended mixture is added to the hopper of the Haake Po...

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Abstract

A container that 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 Hunter L* of the wall changes by less than About 0.4/mil container wall.

Description

[0001] This application is a divisional application of the following applications: application date: July 25, 2002; application number: 02818665.6 (PCT / US02 / 23825); invention title: "oxygen scavenging resin and container with the lightest color". Background of the invention [0002] Thermoplastic resins such as polyethylene terephthalate (PET) are commonly used to produce packaging materials. PET processed under reasonable conditions produces high-strength products with excellent gas barrier properties. If exposed to oxygen, food, beverages, and medicines may deteriorate or become damaged. 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 often adds several layers of packaging materials or adds oxygen scavengers. [0003] Adding a gas barrier film layer is considered a passive barrier packaging. For example, since ethylene vinyl alcohol (EVOH)...

Claims

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Application Information

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IPC IPC(8): C08L67/02B29C55/00B29L24/00C08J3/22C08J5/00C08K3/10C08K3/22C08K3/24C08K3/34C08K5/34C08L67/00
CPCC08K3/22C08K3/34C08J3/203C08J2367/02C08K3/08C08K2201/005B29C55/02B29C48/288B29C48/023Y10T428/1359Y10T428/1352Y10T428/1397Y10T428/1355C08L67/02C08K3/10
Inventor D·董E·斯森R·莱康拜
Owner MULTISORB TECH INC
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