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Resin packaging

a technology of resin and packaging, applied in the field of resin packaging, can solve the problems of generating water-formation and increasing the molecular weight of resin in an uncontrolled fashion, and achieve the effects of accelerating the oxidation process, preventing accelerated oxidation, and increasing the molecular weight of resins

Inactive Publication Date: 2006-11-02
MEADWESTVACO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0014] Packaging the rosin-based resins, modified rosin resins, hydrocarbon resins and / or hydrocarbon modified resins in sealed oxygen-transmission resistant enclosures from which a substantial portion of the oxygen has been evacuated serves to retard the oxidation process. Another further advantage of vacuum sealing under pressure is that the compression of the brittle resin flakes can shatter the thin layers of resin that trap air with individual flakes, thereby freeing trapped air for evacuation. Additionally, vacuum sealing also serves to evacuate moisture that may be present on the surface of flaked resin, thus helping to reduce distribution of heat energy.

Problems solved by technology

In these extreme situations, the resins can become molten and potentially exothermic (thereby generating water-formation and increasing the molecular weight of the resins in an uncontrolled fashion).

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0039] A series of tests were conducted evaluating the effect of packaging and storage on the oxidation, viscosity, and dilution characteristics of hard resins. For comparison purposes, samples of HC-910 (a flaked hydrocarbon modified rosin resin having a glass transition temperature of 82.2° C. commercially available from MeadWestvaco Corporation) were evaluated under two conditions. As a control, 500 grams of resin was placed in a tray and left exposed to atmosphere (hereinafter “tray” sample). In the second evaluation, 100 grams of resin were placed in each of sixteen separate polyethylene plastic bags, vacuum was applied to remove a substantial proportion of the air out of the bag, and the bags were then heat sealed to form sealed enclosures having oxygen-reduced atmospheres (hereinafter “vacuum bag” samples). The resins were packaged at a temperature of about 73° F. and a relative humidity of about 30%. The respective resin samples were subsequently stored at 110° F. to simulat...

example 2

[0044] A rosin resin can be packaged by the following method. Two thousand pounds of flaked hard rosin resin can be placed into a super sack. The super sack containing the resin can be placed within a nylon and polyethylene fused layered liner enclosure bag, which can then be subjected to a first purge with nitrogen to displace and dilute the oxygen content therein. The nitrogen gas can then vacuumed out of the enclosure bag to about 6.9 pounds per square inch gage. The enclosure bag can then purged a second time with nitrogen gas to further dilute any remaining oxygen and a second vacuum can be pulled to about 6.9 pounds per square inch gage to remove the gas and produce an oxygen-reduced atmosphere. The enclosure bag can then be sealed to maintain the oxygen-reduced atmosphere within the enclosure bag. At the time the enclosure bag is sealed, the resins contained in the enclosure bag have a temperature at least 5° F. below their glass transition temperatures.

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Abstract

This invention relates to packages, systems, and methods for protecting rosin-based resins, modified rosin resins, hydrocarbon resins and hydrocarbon modified resins suitable for use in the production of printing inks and other coatings from the effects of exposure to oxygen during transport and storage. In particular, this method involves the packaging of rosin-based resins, modified rosin resins, hydrocarbon resins and / or hydrocarbon modified resins at a temperature at least 5° F. below the glass transition temperature of the resin being packaged in sealed oxygen-transmission resistant enclosures from which a substantial portion of the oxygen has been evacuated.

Description

FIELD OF INVENTION [0001] This invention relates to packages, systems, and methods for protecting rosin-based resins, modified rosin resins, hydrocarbon resins and hydrocarbon modified resins suitable for use in the production of printing inks and other coatings from the effects of exposure to oxygen during transport and storage. In particular, this method involves the packaging of rosin-based resins, modified rosin resins, hydrocarbon resins and / or hydrocarbon modified resins at a temperature at least 5° F. below the glass transition temperature of the resin being packaged in sealed oxygen-transmission resistant enclosures from which a substantial portion of the oxygen has been evacuated. BACKGROUND OF THE INVENTION [0002] It is well known that rosin exists in a number of forms. The term rosin, as used herein, includes tall oil rosin, wood rosin, gum rosin, crude materials and mixtures containing any of the foregoing, and, in general, any materials containing abietic acid, includin...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B65D85/00B65D57/00
CPCB65D81/2023C08L93/04C08L93/00B65D85/00
Inventor WEBB, GREGORYCAPPO, LETITIA PLETKA
Owner MEADWESTVACO CORP
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