File system for rolling back data on tape
US-2016092315-A1 · Mar 31, 2016 · US
Magnetic recording medium having characterized magnetic layer and magnetic recording and reproducing device
US11417359B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11417359-B2 |
| Application number | US-202017021529-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 15, 2020 |
| Priority date | Sep 17, 2019 |
| Publication date | Aug 16, 2022 |
| Grant date | Aug 16, 2022 |
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- Title
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Abstract
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The magnetic recording medium includes a non-magnetic support; and a magnetic layer including a ferromagnetic powder, in which an isoelectric point of a surface zeta potential of the magnetic layer after pressing the magnetic layer at a pressure of 70 atm is equal to or greater than 5.5.
First claim
Opening claim text (preview).
What is claimed is: 1. A magnetic recording medium comprising: a non-magnetic support; and a magnetic layer including a ferromagnetic powder, wherein an isoelectric point of a surface zeta potential of the magnetic layer after pressing the magnetic layer at a pressure of 70 atm is equal to or greater than 5.5. 2. The magnetic recording medium according to claim 1 , wherein the isoelectric point is 5.5 to 7.0. 3. The magnetic recording medium according to claim 1 , wherein the magnetic layer includes inorganic oxide-based particles. 4. The magnetic recording medium according to claim 3 , wherein the inorganic oxide-based particles are composite particles of an inorganic oxide and a polymer. 5. The magnetic recording medium according to claim 1 , wherein the magnetic layer includes a binding agent having an acidic group. 6. The magnetic recording medium according to claim 5 , wherein the acidic group is at least one kind of acidic group selected from the group consisting of sulfonic acid groups and salts thereof. 7. The magnetic recording medium according to claim 1 , further comprising: a non-magnetic layer including a non-magnetic powder between the non-magnetic support and the magnetic layer. 8. The magnetic recording medium according to claim 1 , further comprising: a back coating layer including a non-magnetic powder on a surface of the non-magnetic support opposite to a surface provided with the magnetic layer. 9. The magnetic recording medium according to claim 1 , wherein the magnetic recording medium is a magnetic tape. 10. A magnetic recording and reproducing device comprising: a magnetic recording medium; and a magnetic head, wherein the magnetic recording medium comprises: a non-magnetic support; and a magnetic layer including a ferromagnetic powder, wherein an isoelectric point of a surface zeta potential of the magnetic layer after pressing the magnetic layer at a pressure of 70 atm is equal to or greater than 5.5. 11. The magnetic recording and reproducing device according to claim 10 , wherein the isoelectric point is 5.5 to 7.0. 12. The magnetic recording and reproducing device according to claim 10 , wherein the magnetic layer includes inorganic oxide-based particles. 13. The magnetic recording and reproducing device according to claim 12 , wherein the inorganic oxide-based particles are composite particles of an inorganic oxide and a polymer. 14. The magnetic recording and reproducing device according to claim 10 , wherein the magnetic layer includes a binding agent having an acidic group. 15. The magnetic recording and reproducing device according to claim 14 , wherein the acidic group is at least one kind of acidic group selected from the group consisting of sulfonic acid groups and salts thereof. 16. The magnetic recording and reproducing device according to claim 10 , wherein the magnetic recording medium further comprises a non-magnetic layer including a non-magnetic powder between the non-magnetic support and the magnetic layer. 17. The magnetic recording and reproducing device according to claim 10 , wherein the magnetic recording medium further comprises a back coating layer including a non-magnetic powder on a surface of the non-magnetic support opposite to a surface provided with the magnetic layer. 18. The magnetic recording and reproducing device according to claim 10 , wherein the magnetic recording medium is a magnetic tape.
Assignees
Inventors
Classifications
containing polyesters, polyethers, silicones, polyvinyl resins, polyacrylresins or epoxy resins (G11B5/7022 takes precedence) · CPC title
magnetic tapes · CPC title
Ferrites · CPC title
comprising non-magnetic particles in the back layer, e.g. particles of TiO2, ZnO or SiO2 · CPC title
- G11B5/7021Primary
containing a polyurethane or a polyisocyanate · CPC title
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Frequently asked questions
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- What does patent US11417359B2 cover?
- The magnetic recording medium includes a non-magnetic support; and a magnetic layer including a ferromagnetic powder, in which an isoelectric point of a surface zeta potential of the magnetic layer after pressing the magnetic layer at a pressure of 70 atm is equal to or greater than 5.5.
- Who is the assignee on this patent?
- Fujifilm Corp
- What technology area does this patent fall under?
- Primary CPC classification G11B5/7021. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Aug 16 2022 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 12 related publications on this page (citations in our corpus or others sharing the same primary CPC).