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Resin for Oxygen-absorbing Adhesive and Oxygen-absorbing Adhesive

a technology of oxygen-absorbing adhesives and resins, which is applied in the direction of non-macromolecular adhesive additives, transportation and packaging, and other chemical processes, can solve the problems of poor oxygen-absorbing performance, opaque oxygen-absorbing adhesives, and oxygen-absorbing adhesives, and achieve easy production, excellent oxygen removal performance, and low cost

Inactive Publication Date: 2013-06-06
TOYO SEIKAN GRP HLDG LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a flexible packaging material that can remove oxygen effectively and at a low cost. It uses a special adhesive made up of two parts that absorb oxygen. This adhesive can be used in multilayer packaging materials to protect sensitive foods, pharmaceuticals, and electronic components from oxygen damage. The packaging material can keep these items fresher for longer periods of time.

Problems solved by technology

However, the oxygen-absorbing adhesive has the following problems and the like.
Specifically, the oxygen-absorbing adhesive is opaque, and poor in oxygen-absorbing performance.
In addition, the oxygen-absorbing adhesive cannot be used in a dry atmosphere, because the expression of the oxygen-absorbing performance requires water.
However, there is no case where oxygen-absorbing property, adhesion, and cohesive force are all achieved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0085]Into a 3-L separable flask equipped with a stirrer, a nitrogen inlet, and a Dean-Stark water separator, 399 g of a methyltetrahydrophthalic anhydride isomer mixture (HN-2200 manufactured by Hitachi Chemical Co., Ltd.) containing 45% by mole of 4-methyl-Δ3-tetrahydrophthalic anhydride and 21% by mole of cis-3-methyl-Δ4-tetrahydrophthalic anhydride as the acid component (A), 50 g of terephthalic acid (manufactured by Wako Pure Chemical Industries, Ltd.) as the acid component (B), 30 g of succinic anhydride (manufactured by Wako Pure Chemical Industries, Ltd.) as the further acid component, 379 g of 1,4-butanediol (manufactured by manufactured by Wako Pure Chemical Industries, Ltd.) as the diol component, 300 ppm of isopropyl titanate (manufactured by KISHIDA CHEMICAL Co., Ltd.) as the polymerization catalyst, and 20 ml of toluene were introduced. Then, a reaction was allowed to proceed for approximately 6 hours in a nitrogen atmosphere at 150° C. to 200° C., while the produced w...

example 2

[0088]An oxygen-absorbing adhesive solution was prepared by mixing Curing Agent A in an amount of 20 phr in terms of solid content with Base Solution A, followed by shaking. An oxygen-absorbing film was prepared by using the prepared adhesive solution in the same manner as in Example 1, and then subjected to the evaluations after storage. Table 1 shows the results.

example 3

[0089]An oxygen-absorbing adhesive solution was prepared by mixing Curing Agent B (A-50 manufactured by Mitsui Chemicals, Inc., an alicyclic and aliphatic mixture isocyanate-based curing agent with a solid content concentration of 75%) in an amount of 10 phr in terms of solid content with Base Solution A, followed by shaking. An oxygen-absorbing film was prepared by using the prepared adhesive solution in the same manner as in Example 1, and then subjected to the evaluations after storage. Table 1 shows the results.

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Abstract

The purpose of the present invention is to provide a two-component curable oxygen-absorbing resin composition that has both oxygen-absorbing and adhesive properties and cohesive power. The resin for an oxygen-absorbing adhesive is a polyester comprising structural units derived from an acid component (A) and an acid component (B), wherein the ratio of the acid component (A) to total acid components is 70 to 95 mol %, the ratio of the acid component (B) to total acid components is 0 to 15 mol %, the polyester has a glass transition temperature of −20° C. to 2° C., the resin is cured using a hardening agent, the acid component (A) is tetrahydrophthalic acid or a derivative thereof, or tetrahydrophthalic acid anhydride or a derivative thereof, and the acid component (B) is phthalic acid.

Description

TECHNICAL FIELD[0001]The present invention relates to a resin for an oxygen-absorbing adhesive and an oxygen-absorbing adhesive which are excellent in adhesion, cohesive force, and oxygen-absorbing property.BACKGROUND ART[0002]For improvement in content storage performances, various gas-barrier packaging materials have been proposed. In particular, oxygen-absorbing packaging containers obtained by using materials having oxygen-absorbing performances for packaging containers have attracted attention recently. A method in which an oxygen-absorbing resin composition is used as a paint or an adhesive for coating has been proposed as a method for achieving an oxygen-absorbing packaging container.[0003]Patent Literature 1 proposes an oxygen-absorbing adhesive obtained by blending an inorganic oxide having oxygen-absorbing property with a polyol. However, the oxygen-absorbing adhesive has the following problems and the like. Specifically, the oxygen-absorbing adhesive is opaque, and poor i...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B01J20/26
CPCC08G63/54C09J167/06B01J20/264B32B2307/74B32B2255/06B32B2255/26B32B15/09Y10T428/31794C08G63/52C09J11/06C09J167/02C09J167/03B32B7/12B65D81/266C08G63/183
Inventor OHTA, YOSHIHIROISHIZAKI, YOICHIASANO, YUI
Owner TOYO SEIKAN GRP HLDG LTD
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