Sealing member and method of producing the same

A sealing member and foam-making technology, which is applied in the directions of engine sealing, chemical instruments and methods, and engine components, can solve problems such as difficulty in sealing materials, and achieve the effect of reducing specific permittivity and high conductivity.

Active Publication Date: 2005-08-17
INOAC CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the specific permittivity is basically a value inherent in the material, it is difficult to select a material that has both airtightness and low specific permittivity

Method used

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  • Sealing member and method of producing the same
  • Sealing member and method of producing the same
  • Sealing member and method of producing the same

Examples

Experimental program
Comparison scheme
Effect test

experiment example

[0035] Next, an experimental example in which the sealing member of the present invention is produced from the foam raw materials under the conditions described in Table 1 and Table 2, and its sealing properties and the like are evaluated.

[0036] (Experiment 1) Regarding the difference in density, 50% CLD and 75% CLD

[0037] In 100 parts by weight of polyether polyol A, mix 3 parts by weight of crosslinking agent (1,4-butanediol), 20 parts by weight of thickener (aluminum hydroxide), 0.1 part by weight of metal catalyst (tin octanoate Stannousoctoate) and 3 parts by weight of a foam stabilizer (silicon-based substance; including a solvent for dilution) to obtain a mixture. Nitrogen (foaming gas) and polyisocyanate (trade name C-1130 ; Nippon Polyurethane Industry Co., Ltd., グルドドMDI, NCO content: 31%) were mixed and sheared to obtain the raw material M. The foam raw material M is supplied from the nozzle 34 onto a substrate film (made of PET) of a desired thickness which i...

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Abstract

A sealing member comprising an elastic sheet having a density in the range of 100 to 250 kg / m<3>. The elastic sheet is obtained by reacting and curing a polyurethane-foam raw material which is provided by mixing 100% by volume of a resin raw material and 300% by volume or more of a foam-forming gas, in which the resin raw material includes polyol and isocyanate as a main raw material and a foam stabilizer as an auxiliary material, and the like. The compression load deflection at 50% of the elastic sheet is in the range of 0.003 to 0.025 MPa, and the compression load deflection at 75% thereof is in the range of 0.02 to 0.40 MPa.

Description

technical field [0001] The present invention relates to a sealing member and a manufacturing method thereof, and more specifically, to a sealing member suitable for being arranged between the periphery of a liquid crystal display screen or the periphery of a microphone of a display portion of a portable communication device such as a mobile phone and the inner surface of a case, and a sealing member and the like. Manufacturing method. Background technique [0002] In electrical equipment such as televisions, computers, mobile phones, and displays of portable information terminals, internal devices such as a liquid crystal display unit, a microphone unit, and a speaker unit are arranged to face the outside of the housing. In electrical equipment with such a structure, for example, a sealing member is interposed between the periphery of internal equipment such as a liquid crystal display unit and the casing to prevent dust, prevent light leakage from backlights, and prevent vi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1339C08G18/00C08G18/66C08G101/00C08J5/18C08J9/00C08J9/12C09K3/10F16J15/10
CPCC08G2101/0008C08G2190/00C08G18/6674C09K3/1021F16J15/102F16J15/108C08G2110/0008C08J5/18C08J9/12C08J9/00
Inventor 佐藤正史
Owner INOAC CORP
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