Thin film magnetic head
US4824731A · kind A · utility
5Cited by
3References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 28, 1988 |
| Grant date | Apr 25, 1989 |
| Priority date | — |
| Expiry date | Jan 28, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31721
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A thin film magnetic head of which the insulation layer is made of a polyimide resin obtained by heat-curing a polyimide precursor represented by the following general formula (I) or (II) or a mixture thereof not only has excellent characteristics with respect to the insulation layer, i.e. satisfactory flatness, high glass transition temperature and excellent adhesiveness but also is free from film defects, i.e., exhibits high reliability: ##STR1## wherein R is, e.g., ##STR2## Ar.sup.1 is, e.g., ##STR3## Ar.sup.2 is, e.g. ##STR4## n is an integer of 1 to 100, and m is an integer of 10 to 500.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.