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Material for pressure measurement

A pressure and substrate technology, applied in the field of pressure measurement materials, which can solve problems such as inability to use products, concentration analysis or control, etc.

Active Publication Date: 2010-06-16
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, as described above, there is a problem that it cannot be used in a process where a slight pressure change will affect the quality variation of the product, or even if it develops color, it cannot be read as data by scanning or the like. For precise concentration analysis or control

Method used

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  • Material for pressure measurement

Examples

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Effect test

preparation example Construction

[0081] (Preparation of preparation liquid for color-forming agent layer formation)

[0082] The microcapsules can be obtained in the form of a dispersion as described above, and the dispersion of the microcapsules can also be directly used as a preparation solution for forming a color-forming agent layer containing an electron-donating leuco dye precursor (especially for coating). liquid). In addition, a buffer such as starch or starch derivative fine powder, cellulose fiber powder, water-soluble polymer binders such as polyvinyl alcohol, vinyl acetates, acrylic acid, etc. may be further added to the dispersion of microcapsules obtained above. Hydrophobic polymer binders such as styrene-butadiene copolymer latex, fluorescent whitening agents, defoamers, penetrating agents, ultraviolet absorbers, and preservatives are used as preparation solutions (especially coating solutions).

[0083] The thus-obtained preparation solution (particularly, the coating solution) is applied to ...

Embodiment 1

[0101] -Preparation of Microcapsule Liquid (A) Including Electron Donating Leuco Dye Precursor-

[0102] Solution A was obtained by dissolving 9 parts of the following compound (A) which is an electron-donating leuco dye precursor in 70 parts of diarylethane. Next, 0.4 parts of a butylene oxide adduct of ethylenediamine dissolved in 1 part of methyl ethyl ketone was added to the solution A being stirred to obtain a solution B. Further, 2 parts of a trimethylolpropane adduct of toluene diisocyanate dissolved in 1 part of methyl ethyl ketone was added to the solution B being stirred to obtain a solution C. Then, the above-mentioned solution C was added to a solution obtained by dissolving 6 parts of polyvinyl alcohol in 150 parts of water, and emulsified dispersion was performed. 300 parts of water were added to the emulsified and dispersed emulsion, heated to 70° C. while stirring, and cooled after stirring for 1 hour. Water was added to adjust the concentration to obtain a m...

Embodiment 2

[0131] Mix 80 parts of microcapsules (A) containing electron leuco dye precursors prepared in Example 1 and 20 parts of microcapsules (B) containing electron leuco dye precursors. The quality of the mixed microcapsule liquid after drying is 5.0g / m with a bar coater 2 The standard was coated on a polyethylene terephthalate (PET) sheet with a thickness of 75 μm, and dried to obtain an electron-donating leuco dye sheet. Evaluation and measurement were performed in the same manner as in Example 1 using this electron-donating leuco dye sheet. The results of evaluation and measurement are shown in Table 1 below.

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Abstract

This invention provides a material for pressure measurement which develops a color by taking advantage of a color development reaction between an electron donating colorless dye precursor and an electron receiving compound and causes a difference in color density between before the application of a pressure of 0.05 MPa and after the application of a pressure of 0.05 MPa, i.e., delta D, of not less than 0.02. Preferably, the electron donating colorless dye precursor is included in a microcapsule, and, when the median diameter of the microcapsule on a volume basis is A ¢mu!m, 5000 to 30000 microcapsules having a diameter of not less than (A + 5) ¢mu!m are present per 2 cm x 2 cm.

Description

technical field [0001] The present invention relates to a pressure measurement material for measuring pressure distribution such as surface pressure. Background technique [0002] Materials for pressure measurement are used in the bonding process of liquid crystal glass, solder printing on printed circuit boards, and pressure adjustment between rollers. Such a material for pressure measurement includes, for example, a pressure measurement film represented by Prescale (trade name) provided by Fuji Film Corporation. [0003] As an example of the pressure measurement film, there is disclosed a pressure measurement sheet that utilizes the color reaction of the electron-donating leuco dye precursor and the electron-accepting compound (for example, refer to Patent Document 1), which can be used at 0.1MPa to 20MPa. Measurements are made within the pressure range of about 100. The pressure measurement membrane has the following characteristics: it can be used after cutting the mem...

Claims

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Application Information

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IPC IPC(8): G01L5/00
CPCH05K1/0269G01L1/247H05K3/1233
Inventor 渡边努松本孝之
Owner FUJIFILM CORP
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