Pressure measurement sheet and method of using the same
First Claim
1. A pressure measurement sheet comprising a support wherein a layer containing microcapsules containing a color former and a layer containing adsorbent are provided on the same or opposing sides of said support, wherein the ratio of the number average wall thickness (δ
- ) to the volume average particle diameter (D) of the microcapsules lies in the range;
δ
/D=about 1.5 ×
10-3 to about 3.0 ×
10-2.
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Abstract
A pressure measurement sheet comprises a support and a layer containing microcapsules provided thereon, wherein the ratio of the number average wall thickness (δ) to the volume average particle diameter (D) of the microcapsules lies in the range: δ/D = about 1.5 × 10-3 to about 3.0 × 10-2. A method of measuring pressure by the use of the pressure measurement sheet described above comprising the steps of contacting the pressure measurement sheet with the area to be measured, applying pressure to form color and determining the applied pressure from changes in optical densities or hues, where the color is formed through contact under pressure between a layer containing microcapsules and a layer containing an adsorbent.
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Citations
9 Claims
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1. A pressure measurement sheet comprising a support wherein a layer containing microcapsules containing a color former and a layer containing adsorbent are provided on the same or opposing sides of said support, wherein the ratio of the number average wall thickness (δ
- ) to the volume average particle diameter (D) of the microcapsules lies in the range;
δ
/D=about 1.5 ×
10-3 to about 3.0 ×
10-2. - View Dependent Claims (2, 3)
- ) to the volume average particle diameter (D) of the microcapsules lies in the range;
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4. A method of measuring pressure which comprises the steps of contacting a pressure measurement sheet which comprises a layer containing microcapsules containing a color former on a support, wherein the ratio of number average wall thickness (δ
- ) to volume average particle diameter (D) of the microcapsules lies in the range;
δ
/D = about 1.5 ×
10-3 to about 3.0 ×
10-2, to a measurement site of an object to be measured to form color under pressure, and determining the pressure from changes in optical densities or hues of the colored image produced on the pressure measurement sheet, wherein color image formation results from contact under pressure between the layer containing microcapsules containing a color former and a layer containing an adsorbent. - View Dependent Claims (5, 6)
- ) to volume average particle diameter (D) of the microcapsules lies in the range;
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7. A pressure measurement sheet comprising a support wherein a layer containing microcapsules containing a color former is provided on said support and a layer containing adsorbent is provided on a different support, wherein the ratio of the number average wall thickness (δ
- ) to the volume average particle diameter (D) of the microcapsules lies in the range;
δ
/D = about 1.5 ×
10-3 to about 3.0 ×
10-2. - View Dependent Claims (8, 9)
- ) to the volume average particle diameter (D) of the microcapsules lies in the range;
Specification
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- Resources
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Current AssigneeFuji Photo Film Co Limited (Fujifilm Holdings Corporation)
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Original AssigneeFuji Photo Film Co Limited (Fujifilm Holdings Corporation)
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InventorsOgata, Yasuhiro, Matsukawa, Hiroharu
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Primary Examiner(s)Woodiel, Donald O.
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Application NumberUS05/627,151Time in Patent Office440 DaysField of Search73/141 R, 73/88 R, 428/488, 428/323, 428/307, 428/914US Class Current73/762CPC Class CodesB01J 13/02 Making microcapsules or mic...G01L 1/247 using distributed sensing e...
