Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Including a second component containing structurally defined...
Patent
1995-08-08
1999-10-26
Le, H. Thi
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Including a second component containing structurally defined...
428335, 428336, 428341, 428343, 428692, 428694BN, 428694BA, 428900, B32B 516
Patent
active
059724935
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 .mu.m tap 800 .mu.m and particles bigger than average are removed out. And solvents with boiling point higher than 175 .degree. 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.
REFERENCES:
patent: 4701024 (1987-10-01), Kobayashi et al.
patent: 5151032 (1992-09-01), Igawa
patent: 5186631 (1993-02-01), Okutsu
patent: 5411398 (1995-05-01), Nakanishi et al.
Igaue Sadatoshi
Iwasaki Takashi
Ogura Atushi
Chemitech, Inc.
Le H. Thi
Lieberstein Eugene
Meller Michael N.
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