Double face self-adhesive sheet for fixation of hard disk drive component and hard disk drive

A technology of hard disk drive and adhesive sheet, which is applied in the directions of film/sheet adhesives, adhesives, flat record carrier equipment, etc., can solve the problems of poor followability of the height difference between the adherend and the adhesive layer, etc. Achieve the effects of excellent outgassing inhibition, good processability and low pollution

Active Publication Date: 2010-07-07
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, for an adherend with a fine pattern (such as a circuit pattern, etc.) and a fine level difference on the surface, especially when it is difficult to press when pasting a double-sided adhesive sheet, it has been found that the adhesive layer may not be able to follow it sufficiently. Into the narrow space between the patterns, resulting in a gap between the adherend and the adhesive layer, the problem of poor followability of the height difference

Method used

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  • Double face self-adhesive sheet for fixation of hard disk drive component and hard disk drive
  • Double face self-adhesive sheet for fixation of hard disk drive component and hard disk drive
  • Double face self-adhesive sheet for fixation of hard disk drive component and hard disk drive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0097] 93 parts by weight of butyl acrylate, 7 parts by weight of acrylic acid and 0.05 parts by weight of 4-hydroxybutyl acrylate are solvent-polymerized with ethyl acetate and 0.1 part by weight of azobisisobutyronitrile as an initiator by a conventional method, A solution (solid content concentration: 25% by weight) of an acrylic polymer (referred to as "acrylic polymer 1") having a weight average molecular weight of 1,500,000 was obtained. In this solution, with respect to 100 parts by weight of the acrylic polymer, 0.4 parts by weight (in terms of solid content) of an isocyanate-based crosslinking agent (manufactured by Nippon Polyurethane Industry Co., Ltd., trade name "Coroneto L"; trimethylol Toluene diisocyanate adduct of propane, solid content concentration 75% by weight) to obtain a binder solution (acrylic binder solution).

[0098] The adhesive solution obtained above was applied to both surfaces of a polyethylene terephthalate film (manufactured by Toray Co., Ltd...

Embodiment 2

[0104] As shown in Table 1, the compounding amount of the isocyanate crosslinking agent was changed, and a polyfunctional epoxy crosslinking agent (manufactured by Mitsubishi Gas Co., Ltd., trade name "Tetrade C") was also used as a crosslinking agent. The same operation as in Example 1 was carried out to obtain a double-sided adhesive sheet.

[0105] In addition, the "compounding amount (parts by weight)" of the isocyanate-based crosslinking agent (Coronet L) in Table 1 represents "the compounding amount ( parts by weight)". The "compounding amount (parts by weight)" of the epoxy-based crosslinking agent (Tetrade C) means "the compounding amount (parts by weight) of Tetrad C itself (commercial product itself) with respect to 100 parts by weight of the acrylic polymer."

Embodiment 3

[0107] As shown in Table 1, except having changed the compounding quantity of a crosslinking agent, it carried out similarly to Example 1, and obtained the double-sided adhesive sheet.

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Abstract

This invention provides a double face adhesive sheet for the fixation of a hard disk drive component, comprising a pressure-sensitive adhesive part comprising a plastic film base material having a thickness of not more than 20 [mu]m and a pressure-sensitive adhesive layer provided on both sides of the plastic film base material, and a nonsilicone release liner provided on the surfaces of both sides of the pressure-sensitive adhesive part. The double face adhesive sheet is characterized in that the thickness of the pressure-sensitive adhesive part is not more than 60 [mu]m, and the amount of outgas upon heating of the pressure-sensitive adhesive part at 120 DEG C for 10 min is not more than 1 [mu]g / cm2. The double face adhesive sheet is free from silicone and thus is excellent in low contamination and outgas suppression, as well as in working properties. The conformability to difference in level is improved by bringing the thickness of the plastic film base material to not more than 13[mu]m. When the gel fraction of the pressure-sensitive adhesive layer is 10 to 60%, 'lifting' from an adherend is less likely to occur even when a heating step is carried out after the application ofthe sheet.

Description

technical field [0001] The present invention relates to a double-sided adhesive sheet used for fixing components of a hard disk drive. Moreover, it is related with the hard disk drive using this double-sided adhesive sheet. Background technique [0002] At present, in the manufacturing process of hard disk drives (magnetic recording devices: HDD), in the fixing of parts such as flexible printed circuit boards (sometimes called "FPC"), double-sided adhesive sheets (double-sided pressure-sensitive adhesive piece). [0003] As said double-sided pressure-sensitive adhesive sheet, known for example: the double-sided pressure-sensitive adhesive sheet that has carried out the processability of release liner, the improvement of low pollution or the suppression of outgassing (refer to Patent Document 1); A double-sided PSA sheet with improved heat resistance and processing suitability of the PSA sheet (see Patent Document 2). [0004] Patent Document 1: Specification of Japanese P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/02C09J133/00G11B25/04
CPCC08L23/16C09J2201/128C09J133/066C09J2201/606C08L63/00C08F2220/1825C08K5/0025C09J7/0217C09D123/0815C09J2205/102C08L2666/16C09J7/385C08F220/1804C09J2301/124C09J2301/302C09J2301/408Y10T428/1476C08L2666/06C08F220/06C08F220/281
Inventor 野中崇弘大学纪二大浦正裕
Owner NITTO DENKO CORP
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