Adhesive sheet

An adhesive sheet, non-adhesive technology, applied in the direction of adhesives, film/sheet adhesives, synthetic resin layered products, etc. Small problems, such as good interfacial adhesion, excellent adhesiveness and heat-peelability, and less residual glue

Active Publication Date: 2019-11-15
LINTEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In recent years, with the miniaturization of electronic components, the bonding area between the PSA sheet and the adherend has decreased, resulting in poor bonding such as chip flying.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0285] In this invention, although the following Example demonstrates concretely, this invention is not limited to the following Example. In addition, the physical property value in the following manufacture example and an Example is the value measured by the following method.

[0286]

[0287] The value measured by gel permeation chromatography (manufactured by Tosoh Corporation, product name "HLC-8020") under the following conditions and measured in terms of standard polystyrene was used.

[0288] (measurement conditions)

[0289] ・Column: "TSK guard column HXL-L", "TSK gel G2500HXL", "TSK gel G2000HXL", "TSKgel G1000HXL" (all manufactured by Tosoh Corporation) are connected in sequence

[0290] ·Column temperature: 40℃

[0291] Elution solvent: tetrahydrofuran

[0292] ·Flow rate: 1.0mL / min

[0293]

[0294] Measurement was performed using a constant pressure thickness measuring instrument (model: "PG-02J", standard: based on JIS K6783, Z1702, Z1709 standard) manufa...

manufacture example 1

[0325] Production Example 1 (Preparation of Composition (x1))

[0326] (1) Synthesis of urethane acrylate oligomers

[0327] 100 parts by mass of polypropylene glycol having a weight average molecular weight of 3,000 (solid content conversion; the same applies hereinafter), 4 parts by mass of hexamethylene diisocyanate, and 0.02 parts by mass of dioctyltin dilaurate were mixed, and stirred at 80° C. for 6 hours , thus obtaining the reactants. The IR spectrum of the obtained reactant was measured by infrared spectroscopy, and it was confirmed that the isocyanate group almost disappeared.

[0328] Then, 1 mass part of 2-isocyanatoethyl acrylate was mixed with respect to the obtained reactant whole quantity, it stirred at 80 degreeC for 3 hours, and obtained the urethane acrylate oligomer. The IR spectrum of the obtained urethane acrylate oligomer was measured by infrared spectroscopy, and it was confirmed that the isocyanate group almost disappeared. Moreover, when the molecu...

manufacture example 2

[0334] Production Example 2 (Preparation of Composition (y))

[0335] 2-Hydroxyethyl acrylate was reacted with a terminal isocyanate urethane prepolymer to obtain a 2-functional acrylic urethane oligomer with a weight average molecular weight (Mw) of 5000. The terminal isocyanate urethane The prepolymer is obtained by reacting ester diol and isophorone diisocyanate (IPDI).

[0336] Then, 40 mass % (solid content ratio) of isobornyl acrylate (IBXA) as an energy ray polymerizable monomer was blended into 40 mass % (solid content ratio) of the urethane acrylate oligomer synthesized above, and Phenyl hydroxypropyl acrylate (HPPA) 20% by mass (solid content ratio), with respect to the total amount (100 parts by mass) of the acrylic urethane oligomer and the energy ray polymerizable monomer 2.0 parts by mass (solid content ratio) of 1-hydroxycyclohexyl phenyl ketone (manufactured by BASF Corporation, product name "Irgacure 184") as an initiator, and 0.2 mass parts (solid content ra...

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Abstract

Provided is an adhesive sheet comprising a layered body in which an adhesive layer (X1) and a non-adhesive thermally expandable substrate (Y) are directly layered in this order. The layered body is formed by directly layering, in this order, a material for forming the adhesive layer (X1), namely, a coating film (x1') comprising a composition (x1), and a material for forming the thermally expandable substrate (Y), namely, a coating film (y') comprising a composition containing a resin and thermally expandable particles, then simultaneously irradiating the coating film (x1') and the coating film(y') with an energy beam. The adhesive sheet leaves little adhesive residue on the surface of an adherend after being heated and peeled off, has good interfacial adhesion between the substrate and the adhesive layer, and exhibits excellent adhesion during temporary fixing and excellent peelability when heated.

Description

technical field [0001] The present invention relates to an adhesive sheet. Background technique [0002] The pressure-sensitive adhesive sheet is used not only for semi-permanently fixing members, but also for temporarily fixing them when processing building materials, interior materials, electronic components, and the like. For such a PSA sheet for temporary fixation, both the adhesiveness at the time of use and the releasability at the time of use are required. [0003] Conventionally, a heat-peelable PSA sheet in which a PSA layer containing thermally expandable particles is provided on a base material is known as a PSA sheet for temporary fixing that satisfies the above-mentioned requirements. The heat-peelable pressure-sensitive adhesive sheet is characterized in that the heat-expandable particles are foamed or expanded by heating, thereby reducing the adhesive force and enabling easy peeling from the adherend. Therefore, it is used as a temporary fixation means, a la...

Claims

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Application Information

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IPC IPC(8): C09J7/40B32B27/00C09J7/22C09J201/00
CPCB32B27/00C09J7/22C09J7/40C09J201/00C09J2301/416C09J2301/312C09J2301/124
Inventor 阿久津高志加藤挥一郎土渕晃司
Owner LINTEC CORP
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