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Double-coated pressure sensitive adhesive sheet for fixing flexible printed circuit board

A flexible printing and adhesive sheet technology, applied in the directions of laminated printed circuit boards, printed circuits, printed circuit manufacturing, etc. The effects of excellent followability, improved quality, and good workability

Inactive Publication Date: 2010-07-21
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-coated pressure sensitive adhesive sheet for fixing flexible printed circuit board
  • Double-coated pressure sensitive adhesive sheet for fixing flexible printed circuit board
  • Double-coated pressure sensitive adhesive sheet for fixing flexible printed circuit board

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0101]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).

[0102] The adhesive solution obtained above was applied to both surfaces of a polyethylene terephthalate film (manufactured by Toray Co., Ltd....

Embodiment 2

[0108] As shown in Table 1, the compounding amount of the isocyanate crosslinking agent in the adhesive solution was changed, and a multifunctional epoxy crosslinking agent (manufactured by Mitsubishi Gas Co., Ltd., trade name "Tetrad C") was also used as the crosslinking agent. agent, except that, it was carried out in the same manner as in Example 1 to obtain a double-sided pressure-sensitive adhesive sheet.

[0109] 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 (Tetrad C) means "the compounding amount (parts by weight) of Tetrad C itself (product itself) with respect to 100 parts by weight of the acrylic polymer."

Embodiment 3、4

[0110] Embodiment 3, 4, comparative example 3

[0111] As shown in Table 1, except that the thickness of the polyethylene terephthalate film used as the plastic film substrate and the thickness of the adhesive layer were changed, it was carried out in exactly the same manner as in Example 2, and a double Adhesive sheet.

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Abstract

Disclosed is a double-coated pressure-sensitive adhesive sheet for fixing a flexible printed circuit board, which includes at least a pressure-sensitive adhesive unit including a plastic base film having a thickness of 13 [mu]m or less, and pressure-sensitive adhesive layers on both sides of the plastic base film. The pressure-sensitive adhesive layers are formed from an acrylic polymer containing, as essential monomer components, a polar-group-containing monomer and an alkyl (meth)acrylate whose alkyl moiety being a linear or branched-chain alkyl group having 2 to 14 carbon atoms. The pressure-sensitive adhesive unit has a thickness of 60 [mu]m or less, the double-coated pressure-sensitive adhesive sheet shows an outgassing of 1 [mu]g / cm2 or less when heated at 120 DEG C. for 10 minutes, and shows a split distance (lifting) of 1.5 mm or less.

Description

technical field [0001] The present invention relates to a double-sided adhesive sheet used for fixing a flexible printed circuit board. Background technique [0002] Currently, in the manufacturing process of hard disk drives (magnetic recording devices: HDD) and the like, double-sided adhesive sheets (double-sided side pressure sensitive adhesive sheet). [0003] As the double-sided PSA sheet, for example: a double-sided PSA sheet that has been improved in processability of a release liner, low-contamination property, or suppressed outgassing (refer to Patent Document 1); A double-sided PSA sheet with improved heat resistance and processing suitability of the bonded sheet (refer to Patent Document 2). [0004] Patent Document 1: Specification of Japanese Patent No. 3901490 [0005] Patent Document 2: Japanese Patent Laid-Open No. 2006-89564 Contents of the invention [0006] However, even in the above-mentioned double-sided pressure-sensitive adhesive sheet, for examp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/02C09J133/08C09J133/10H05K1/14C09J7/22C09J7/38
CPCC09J7/0246H05K1/0393H05K3/386C09J2201/128H05K3/0058H01L2924/00013C09J133/066C09J2203/326H05K2203/0191C09J2201/606C09J2433/00C09J7/38C09J7/22Y10T428/265C09J2301/124C09J2301/302H01L2224/13099H01L2224/13599H01L2224/05599H01L2224/05099H01L2224/29099H01L2224/29599
Inventor 野中崇弘大学纪二大浦正裕
Owner NITTO DENKO CORP
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