Microcapsules for magnetic display and magnetic display sheet comprising such microcapsules
First Claim
1. A microcapsule magnetic display sheet sequentially provided thereon with a pressure-proofing film comprising a sheet vehicle which includes an adhesive layer having the thickness in a range of 30 μ
- m to 130 μ
m;
a microcapsule dispersoid layer comprising a microcapsule including, as a dispersion medium, a mixture of a low boiling point solvent and a high boiling point solvent having a boiling point higher than 175°
C., magnetic powder and non-magnetic powder wherein said microcapsule has particles of a size of 400 μ
m±
Xμ
m to 800 μ
m±
Xμ
m, wherein X=10-20 and wherein particles having a particle diameter exceeding the upper limit are removed, and a transparent film.
4 Assignments
0 Petitions
Accused Products
Abstract
Gelatin microcapsules for magnetic display enclosing therein dispersion medium, magnetic powder and nonmagnetic powder, characterized in that that the dispersion medium in the microcapsules is composed of at least low boiling point solvent, particle diameter of the microcapsules is ion a range of 400 μm tap 800 μm and particles bigger than average are removed out. And solvents with boiling point higher than 175 ° C., dispersant and suspension are contained in the dispersion medium, magnetic powder and nonmagnetic powder are affinity-treated. The microcapsule magnetic display sheet is produced by coating the above-described microcapsules. Therefore, recording speed and erasing speed are fast and recorded words or pictures are clear even if a magnetic force lower than 1100 gauss is used.
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Citations
12 Claims
-
1. A microcapsule magnetic display sheet sequentially provided thereon with a pressure-proofing film comprising a sheet vehicle which includes an adhesive layer having the thickness in a range of 30 μ
- m to 130 μ
m;
a microcapsule dispersoid layer comprising a microcapsule including, as a dispersion medium, a mixture of a low boiling point solvent and a high boiling point solvent having a boiling point higher than 175°
C., magnetic powder and non-magnetic powder wherein said microcapsule has particles of a size of 400 μ
m±
Xμ
m to 800 μ
m±
Xμ
m, wherein X=10-20 and wherein particles having a particle diameter exceeding the upper limit are removed, and a transparent film. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- m to 130 μ
Specification