Resin foam, method for producing resin foam

By irradiating a polyethylene-based composition with an electron beam to create a crosslinking material and foaming it in a mold, a resin foam with improved manufacturing ease and foaming properties is achieved, offering enhanced appearance, strength, and reduced weight.

JP7883427B2Active Publication Date: 2026-07-01INOAC CORP
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
INOAC CORP
Filing Date
2022-11-30
Publication Date
2026-07-01

AI Technical Summary

Technical Problem

There is a need for a resin foam that is easy to manufacture and has good foaming properties.

Method used

A resin foam is produced by irradiating a composition containing polyethylene resin, an antioxidant, and a foaming agent with an electron beam to form a crosslinking material, which is then foamed in a mold, with specific conditions such as oxidation induction time and melt viscosity being controlled to ensure ease of manufacturing and effective foaming.

Benefits of technology

The method allows for the production of a resin foam with good foaming properties in a simple manner, resulting in a product with excellent appearance, strength, weight reduction, and heat shrinkage resistance.

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Patent Text Reader

Abstract

To provide a resin foam easy to produce and excellent in a foaming property, and a method for producing a resin foam easy to produce and excellent in a foaming property.SOLUTION: A resin foam 1 is a resin foam obtained by irradiating a composition containing a resin containing polyethylene, an antioxidant, and a foaming agent with an electron beam to obtain a cross-linking raw material, and the cross-linked raw material is foamed in a mold. Polyethylene satisfies the following conditions (1) and (2). Condition (1): For polyethylene, an oxidation induction time (OIT) measured at 200°C. using a differential scanning calorimeter (DSC) is 10 minutes or less. Condition (2): Melt viscosity of the measurement sample obtained by mixing polyethylene and antioxidant in a mass ratio in the composition with an electron beam irradiated at the time of forming a resin foam at a shear rate of 122 sec-1 and 200°C. is 10000 Pa s or less.SELECTED DRAWING: Figure 3
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