Claims
- 1. A magnetic disk cartridge comprising a cartridge frame and, freely rotatably disposed therein, a magnetic disk comprising a magnetic recording medium and a hub provided at the center of said medium, wherein said hub is bonded to said medium with a moisture-curable urethane hot-melt adhesive, and an adhesive strength between the hub and the medium is 14 kgfcm or more at 23.degree. C. and 50% RH just after assembly thereof, and after curing of the adhesive, the adhesive strength is 28 kgfcm or more at a temperature from 23.degree.-60.degree. C.
- 2. The magnetic disk cartridge as claimed in claim 1, wherein said hot-melt adhesive is the moisture-curable urethane hot-melt adhesive having a polyester moiety in molecular chain thereof.
- 3. The magnetic disk cartridge as claimed in claim 2, wherein said polyester moiety is derived from reactants of adipic acid and 1,6-hexane diol.
- 4. The magnetic disk cartridge as claimed in claim 1, wherein a chemical bond is formed between isocyanate groups of said moisture-curable urethane hot-melt adhesive and active hydrogen present on the surfaces of said medium and said hub.
Priority Claims (1)
Number |
Date |
Country |
Kind |
4-230418 |
Aug 1992 |
JPX |
|
Parent Case Info
This application is a continuation of application Ser. No. 08/092,069 filed on Jul. 16, 1993, now abandoned.
US Referenced Citations (6)
Foreign Referenced Citations (6)
Number |
Date |
Country |
61-115283 |
Jun 1986 |
JPX |
61-204883 |
Sep 1986 |
JPX |
61-242378 |
Oct 1986 |
JPX |
62-298040 |
Dec 1987 |
JPX |
2306485 |
Dec 1990 |
JPX |
312084 |
Jan 1991 |
JPX |
Continuations (1)
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Number |
Date |
Country |
Parent |
92069 |
Jul 1993 |
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