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Method to reduce damage caused by irradiation of halogenated polymers

a technology of halogenated polymers and irradiation, which is applied in the field of packaging, can solve the problems of adverse effects and adverse effects of materials, and achieve the effect of less subject to deterioration over tim

Inactive Publication Date: 2005-12-22
ARADIGM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007] Another aspect of the invention is that the polymer material is less subject to deterioration over time due to the inert storage environment created by the presence of the scavenger material.

Problems solved by technology

However, even when substantially all of the oxygen is removed the radiation may create other reactants such as acids which react with the polymeric material over time.
The reactants produced can adversely effect the properties of the materials such as having adverse effects of the structural integrity of the polymeric component or subcompoents thereof.
This is particularly undesirable when the sterilized polymeric component must be stored for relatively long periods of time prior to use.

Method used

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  • Method to reduce damage caused by irradiation of halogenated polymers
  • Method to reduce damage caused by irradiation of halogenated polymers

Examples

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specific embodiments

[0128]FIG. 1 is a schematic view of the embodiments of the invention. Specifically, FIG. 1 shows an outer package 1 which may be in the form of a plastic bag comprised of one or more polymer materials which materials are substantially impermeable to inert gas which may be present inside the package 1 and contaminants which may be present outside the package 1. The package holds the polymer component 2 which here is in the form of laminated film (100-1500 ft) mounted on a plastic spool. The polymer component in the form of a tape 2 may be wound around the polymer spool 3. The spool 3 includes oval shaped openings 7 and 9. Single or multiple openings of any shape may be used. The roll of film may be in the form of a plurality of separate components or subcomponents. The components may be polymeric containers for pharmaceuticals. The components may be used as nozzles for aerosolized delivery of drugs. Examples of containers and nozzles are disclosed and described in U.S. Pat. Nos. 5,70...

example 1

[0134] A blister film laminate comprising of polychlorotrifluoroethylene (PCTFE) and ethylene acrylic acid (EAA) was tested by exposure to gamma irradiation dose of 25-35 kGy in air and by using an inert environment and a HF, HCl scavenger-based process. Irradiation of such laminate stuctures results in formation of F−& Cl− based reactive species that continue to degrade the film stored inside a sealed container during post-irradiation shelf life.

[0135] The sterilization packages was made by placing the roll of blister film laminate (300-1200 ft) mounted on a reel in three polyethylene bags (20′×20′) and then heat-sealing all three bags. In the control condition no scavengers were placed and the environment inside the triple-bagged package was ambient. The inert environment for gamma processing was created by using oxygen and HF / HCl adsorbents as follows:

Oxygen Adsorbent:

[0136] Freshpax Type D-500. Manufacturer: Multisorb Technologies, NY Each packet is capable of adsorbing 500 ...

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Abstract

A method for producing a polymeric film resistant to degradation during sterilization such as gamma irradiation is presented. The method includes the steps of minimizing the number of free radicals formed during sterilization through use of an inert gas and a reactant scavenger within a sterilization pouch, which reactant scavenger may be acid adsorbents which scavenge the acid by-products formed during irradiation. The films retain physical and mechanical properties with long-term storage. The films are particularly amenable for use as packaging laminates in pharmaceutical, food, semiconductor and medical device industries.

Description

FIELD OF THE INVENTION [0001] The invention relates to the field of packaging and specifically to reducing damage to package materials caused by radiation to sterilize. BACKGROUND OF THE INVENTION [0002] The environmental conditions under which irradiation of polymeric devices and packaging films is conducted can significantly affect the properties of the polymer. Such irradiation of the polymers could be employed for sterilization, as is common in the medical and pharmaceutical industry, as well as for structural modification of polymer such as cross-linking. The presence of oxygen or air during irradiation may produce free radicals; radiation may also break bonds generating new reactive species such as HF, HCl, F−, Cl− from the polymer constituents. The effect of these radicals depends on the nature of the irradiated polymer, the presence of additives, and other parameters such as temperature, total dose, dose rate, and duration of the exposure of the reactive species. The term re...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B32B27/08B65B55/08B65B55/16C08J3/28
CPCB32B27/08B65B55/08Y10T428/2809C08J3/28Y10T428/1352B65B55/16Y10T428/3154
Inventor MAUZE, GANAPATITRILOKEKAR, NIKHIL
Owner ARADIGM
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