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Polyolefin resin foam sheet and method for producing same

A polyolefin-based resin and polyethylene-based resin technology, applied in the field of polyolefin-based resin foam sheets, can solve the problems of reduced impact absorption and achieve good impact absorption and good reprocessing

Active Publication Date: 2021-09-28
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the strength of the surface layer is increased, the foam becomes too hard, and there is concern about a decrease in shock absorbency.
In addition, Patent Document 2 describes a closed-cell foam sheet capable of suppressing liquid crystal seepage (pooling, pooling) that occurs when the pressure becomes stronger, and Patent Document 3 describes that although it is thin, it can Polypropylene-based resin foam sheets that prevent water, dust, etc. from infiltrating electronic / electrical equipment, but reworkability has not been studied

Method used

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  • Polyolefin resin foam sheet and method for producing same
  • Polyolefin resin foam sheet and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] 50 parts by mass of LLDPE (a-2) and 50 parts by mass of LDPE (b-2) as a polyolefin resin, 2.5 parts by mass of azodicarbonamide as a thermally decomposable foaming agent, and 0.5 parts by mass of a phenolic antioxidant The parts were supplied to an extruder and melt-kneaded at 130°C. The foamable composition obtained by kneading the supplied components was extruded from an extruder to obtain a foamable sheet having a thickness of 0.50 mm. Next, the foamable sheet was irradiated with electron beams at 7.5 Mrad from both sides, and the foamable sheet was crosslinked to obtain a crosslinked foamable sheet. The crosslinked foamable sheet was continuously fed into a foaming furnace whose upper surface was maintained at 240° C. by an infrared heater and a lower surface by a salt bath, and the sheet was heated and foamed to obtain a foamed sheet. The melting point of the foamed sheet was 115°C. Next, after being temporarily cooled, the foam sheet was obtained by stretching a...

Embodiment 2

[0097] 50 parts by mass of LLDPE (a-3) and 50 parts by mass of LDPE (b-2) as a polyolefin resin, 2.5 parts by mass of azodicarbonamide as a thermally decomposable foaming agent, and 0.5 parts by mass of a phenolic antioxidant The parts were supplied to an extruder and melt-kneaded at 130°C. In addition, the conditions of the method described in Example 1 were followed, and a foamed sheet was obtained by stretching at the stretching ratios in the MD and TD directions described in Table 1. The melting point of the foamed sheet was 113°C. The obtained foam sheet was evaluated according to the above-mentioned evaluation method. The results are shown in Table 1.

Embodiment 3

[0099] 50 parts by mass of LLDPE (a-3) and 50 parts by mass of LDPE (b-2) as a polyolefin resin, 4.5 parts by mass of azodicarbonamide as a thermally decomposable foaming agent, and 0.5 parts by mass of a phenolic antioxidant The parts were supplied to an extruder and melt-kneaded at 130°C. The foamable composition obtained by kneading the supplied components was extruded from an extruder to obtain a foamable sheet having a thickness of 0.50 mm. Others were subjected to electron beam irradiation and foaming according to the conditions of the method described in Example 1, and stretched at the stretching ratios in the MD and TD directions described in Table 1 to obtain a foamed sheet. The melting point of the foamed sheet was 113°C. The obtained foam sheet was evaluated according to the above-mentioned evaluation method. The results are shown in Table 1.

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Abstract

The present invention provides: a foam sheet made of polyolefin resin, wherein the polyolefin resin foam sheet is characterized in that the thickness of the foam sheet is 0.05-0.5 mm, the apparent density is 200-500 kg / m3, the tensile strength at 100% elongation in the lengthwise direction (MD direction) and / or the widthwise direction (TD direction) of the sheet is 3.5-12 MPa, and the ratio of the tensile breaking strength and the tensile strength at 100% elongation in the MD direction and / or the TD direction of the sheet is 1.0-1.8; and a method for producing the foam sheet. The present invention can provide a polyolefin resin foam sheet having excellent reworkability and excellent shock absorption even as a thin foam sheet.

Description

technical field [0001] The present invention relates to a polyolefin-based resin foam sheet that can be suitably used as various cushioning materials, sealing materials, and the like in the fields of electrics, electronics, vehicles, and the like, and a method for producing the same. Background technique [0002] Foams using polyolefin-based resins are generally excellent in flexibility, cushioning properties, and heat insulating properties, and thus are used as laminates having an adhesive layer in various industrial fields. In recent years, foams using polyolefin-based resins have been widely used as buffer materials and sealing materials for devices (cellular phones, smartphones, etc.) equipped with a display panel and a touch panel, and products with a touch panel mounted thereon. The foam to be used is required to be protected from external factors such as impact, and to prevent malfunction and malfunction caused by water intrusion. Further, along with the miniaturizat...

Claims

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Application Information

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IPC IPC(8): C08J9/06C09J7/26C09J7/38
CPCC09J7/26C08L23/0815C08J9/103C08J9/0061C08J2323/06C08J2423/06C08J2201/03C08J9/36C08J2207/02C08J2201/026C08J2203/04C09J2400/243C09J2423/046C09J2203/318C08J9/228C08J2205/06C08L23/06C08L2203/14C08L2205/025C08L2207/066
Inventor 余乡英男石田浩秋山律文冈善之
Owner TORAY IND INC
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