JPS6427023A - Substrate for magnetic disk - Google Patents
Substrate for magnetic diskInfo
- Publication number
- JPS6427023A JPS6427023A JP4665988A JP4665988A JPS6427023A JP S6427023 A JPS6427023 A JP S6427023A JP 4665988 A JP4665988 A JP 4665988A JP 4665988 A JP4665988 A JP 4665988A JP S6427023 A JPS6427023 A JP S6427023A
- Authority
- JP
- Japan
- Prior art keywords
- substrate
- unsatd
- inorg
- filler
- magnetic disk
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
- Macromonomer-Based Addition Polymer (AREA)
- Magnetic Record Carriers (AREA)
Abstract
PURPOSE:To obtain a plastic substrate having excellent formability by specifying the contents of an unsatd. polyester resin having a specific value or below of shrinkage rate at the time of curing, inorg. filler, reinforcing agent and release agent. CONSTITUTION:The substrate is formed by a thermocompression molding method or injection molding method, etc., using the material consisting of 16-30wt.% liquid unsatd. polyester resin having <=0.1% shrinkage rate, 35-80wt.% inorg. filler such as calcium carbonate, 3-30wt.% reinforcing agent such as glass fibers and the balance a proper ratio of the release agent and catalyst. This plastic substrate satisfies the required material characteristics such as hardness, coefft. of thermal expansion, heat resistance, thermal deformation temp. and surface roughness. A magnetic disk having the performance equi. to the performance of an Al substrate is thus obtd. at a low cost.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4665988A JPS6427023A (en) | 1987-04-27 | 1988-02-29 | Substrate for magnetic disk |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10409387 | 1987-04-27 | ||
JP4665988A JPS6427023A (en) | 1987-04-27 | 1988-02-29 | Substrate for magnetic disk |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6427023A true JPS6427023A (en) | 1989-01-30 |
Family
ID=26386764
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4665988A Pending JPS6427023A (en) | 1987-04-27 | 1988-02-29 | Substrate for magnetic disk |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6427023A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2017119774A (en) * | 2015-12-28 | 2017-07-06 | 昭和電工株式会社 | Thermosetting resin composition and cured product thereof |
-
1988
- 1988-02-29 JP JP4665988A patent/JPS6427023A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2017119774A (en) * | 2015-12-28 | 2017-07-06 | 昭和電工株式会社 | Thermosetting resin composition and cured product thereof |
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