Pressure-sensitive adhesive sheet and magnetic disc device
AssigneeNitto Denko Corporation
InventorsKenji Furuta, Akira Hirao, Tatsuya Suzuki
Life of this patent
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Abstract
Provided is a PSA sheet that has a high level of moisture resistance while maintaining good holding power with reduced gas emission. The PSA sheet provided by this invention comprises a moisture-impermeable layer and a PSA layer provided to one face of the moisture-impermeable layer. The PSA layer comprises a polymer A having a weight average molecular weight of 5×104 or higher as a base polymer and a polymer B having a number average molecular weight of 1000 or higher and a weight average molecular weight lower than 5×104.
Claims19
A magnetic disc device comprising
- at least one data-recording magnetic disc,
- a motor that rotates the magnetic disc,
- a magnetic head that at least either reads or writes data on the magnetic disc,
- an actuator that moves the magnetic head, and
- a housing that houses the magnetic disc, the motor, the magnetic head and the actuator;
- wherein
- the housing is provided with a cover seal,
- the cover seal is a pressure-sensitive adhesive sheet comprising:
- a moisture-impermeable layer;
- and
- a pressure-sensitive adhesive layer provided to one face of the moisture-impermeable layer, wherein the pressure-sensitive adhesive layer comprises:
- a polymer A having a weight average molecular weight of 5×104 or higher and 300×104 or lower as a base polymer;
- and
- a polymer B having a number average molecular weight of 1000 or higher and a weight average molecular weight lower than 5×104, and
- the cover seal has an amount of thermally release gas of 10 μg/cm2 or less, determined at 130° C. for 30 minutes by gas chromatography/mass spectrometry.
A pressure-sensitive adhesive sheet comprising:
- a moisture-impermeable layer;
- and
- a pressure-sensitive adhesive layer provided to one face of the moisture-impermeable layer, wherein the pressure-sensitive adhesive layer comprises:
- a polymer A having a weight average molecular weight of 5×104 or higher as a base polymer and 300×104 or lower;
- and
- a polymer B having a number average molecular weight of 1000 or higher and a weight average molecular weight lower than 5×104,
- wherein the pressure-sensitive adhesive sheet has an amount of thermally release gas of 10 μg/cm2 or less, determined at 130° C. for 30 minutes by gas chromatography/mass spectrometry.
Dependencies are inferred from the claim text.