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US 7,147,906 B2Granted
Data storage medium comprising polyimides
AssigneeGeneral Electric Company
InventorsEugene David Herrmann, James Anthony Cella, John Bradford Reitz, Racid Kerboua, Irene Dris
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Abstract
In one aspect the present invention provides a storage medium for data, the storage medium comprising: a) a substrate, a physical portion of which comprises at least one polyimide, and b) at least one data layer on the substrate. The substrate comprising a polyimide exhibits low axial displacement and beneficial damping characteristics.
Claims22
A storage medium for data, the storage medium comprising:
- a) a substrate, a physical portion of which comprises at least one polyimide, and
- b) at least one data layer on the substrate;
- wherein said polyimide has a mechanical damping coefficient of at least about 0.028 at a temperature of about 50° C. at a frequency of about 1.6 hertz;
- and wherein the at least one polyimide comprising structural units of the formula:
- wherein “A” comprises structural units of the formulae:
- or mixtures of the foregoing structural units;
- wherein “D” is a divalent aromatic group, R3 and R10–R12 are independently selected from hydrogen, halogen, and C1–C6 alkyl groups;
- “q” is an integer having a value of 1 up to the number of positions available on the aromatic ring for substitution;
- “W” is a linking group;
- and
- wherein B comprises a divalent organic radical selected from aromatic hydrocarbon radicals having 6 to about 30 carbon atoms and substituted derivatives thereof.
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A storage medium for data, the storage medium comprising:
- a) a substrate, a physical portion of which comprises at least one polyimide;
- and
- b) at least one data layer on the substrate;
- wherein said polyimide has a mechanical damping coefficient of at least about 0.028 at a temperature of about 50 C at a frequency of about 1.6 hertz;
- the at least one polyimide comprising structural units of the formula:
- wherein “A” comprises structural units selected from the group consisting of:
- and mixtures thereof;
- and
- B comprises a divalent organic radical selected from aromatic hydrocarbon radicals having 6 to about 30 carbon atoms and substituted derivatives thereof.
6 more elements
Dependencies are inferred from the claim text.