Double-sided pressure-sensitive adhesive sheet

A pressure-sensitive adhesive sheet, pressure-sensitive adhesive technology, applied in the direction of pressure-sensitive films/sheets, adhesives, adhesive products, etc., can solve the problems of removability (deterioration of rework performance, etc., achieve excellent removability, improve anchoring Excellent performance and impact resistance

Active Publication Date: 2013-01-16
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such defects lead to problems such as deterioration of removability (reworkability)

Method used

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  • Double-sided pressure-sensitive adhesive sheet
  • Double-sided pressure-sensitive adhesive sheet
  • Double-sided pressure-sensitive adhesive sheet

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0081] (Preparation of evaluation samples)

[0082] figure 1 is a schematic diagram (plan view) showing a polyolefin foam substrate (evaluation sample) fixed to an evaluation board for the dent test. exist figure 1 Among them, 11 denotes a polyolefin foam substrate, and 12 denotes an evaluation board.

[0083]The polyolefin foam base material was cut into a sheet having a width of 2 mm and a length of 50 mm to prepare an evaluation sample. Then, the polyolefin foam substrate 11 (evaluation sample) was attached to an evaluation board 12 (acrylic board, size: width 25 mm, length 50 mm, thickness 5 mm) (reference figure 1 ).

[0084] (Determination of dent resistance)

[0085] figure 2 is a schematic diagram (perspective view) illustrating the method of the dent test. exist figure 2 Among them, 13 represents heavy objects. image 3 is a front view (schematic) showing the weight used in the dent test, Figure 4 is a side view (schematic) showing the weight. exist im...

preparation example 1

[0236] Preparation example 1 (preparation of acrylic polymer)

[0237]In a reactor equipped with a condenser tube, a nitrogen inlet tube, a thermometer, a dropping funnel, and a stirrer, add 100 parts by weight of n-butyl acrylate, 2 parts by weight of acrylic acid, 8 parts by weight of vinyl acetate, 0.1 parts by weight of 2-hydroxyethyl acrylate and 0.2 parts by weight of azobisisobutyronitrile (AIBN) (10 hour half-life temperature: 65°C). Next, after nitrogen reflux at room temperature for 1 hour, the temperature was raised, and a polymerization reaction was performed at 58° C. for 6 hours as a main reaction. Then the temperature was further raised, and the first aging reaction was performed at 65° C. for 2 hours. The temperature was raised again, and a second aging reaction was performed at 72° C. for 2 hours. Then, the reaction mixture was cooled to obtain an acrylic polymer solution (referred to as "acrylic polymer solution A"). The acrylic polymer in the acrylic pol...

preparation example 2

[0238] Preparation example 2 (preparation of acrylic polymer)

[0239] Except replacing the solvent (organic solvent) with a mixed solvent of toluene and ethyl acetate (toluene / ethyl acetate=8 / 2 weight ratio) and performing the main reaction at 56° C. for 6 hours, followed by the first reaction at 64° C. The secondary aging reaction was carried out for 2 hours, the temperature was increased, and the second aging reaction was carried out at 73°C for 3 hours, in the same manner as in Preparation Example 1, an acrylic polymer solution (referred to as "acrylic polymer solution") was obtained. B"). The weight-average molecular weight of the acrylic polymer in the acrylic polymer solution B (referred to as "acrylic polymer B") was 550,000, the weight-average molecular weight / number-average molecular weight ratio was 6.2, and the molecular weight among all the polymers was The ratio (content) of the polymer of 100,000 or less was 22% by weight.

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Abstract

The present invention provides a double-sided pressure-sensitve adhesive sheet excellent in waterproof property (water stopping property) and impact resistance. The present invention relates to a double-sided pressure-sensitive adhesive sheet including a polyolefin foam substrate and an acrylic pressure-sensitive adhesive layer on both surfaces of the polyolefin foam substrate, wherein the polyolefin foam substrate has a volume percentage of closed cells of 70% or more and a degree of crosslinking of from 3 to 60 wt%, and the acrylic pressure-sensitive adhesive layer is formed from a pressure-sensitive adhesive composition containing: an acrylic polymer formed from a component including, as an essential monomer component thereof, an alkyl (meth)acrylate having a linear or branched alkyl group; and a tackifying resin.

Description

technical field [0001] The present invention relates to a double-sided pressure-sensitive adhesive sheet, and more particularly, to a double-sided pressure-sensitive adhesive sheet comprising a polyolefin foam substrate and excellent in both water repellency and impact resistance. Background technique [0002] A double-sided pressure-sensitive adhesive sheet with a base material comprising a pressure-sensitive adhesive layer on both sides of the base material is generally used in various industrial fields, for example, as highly reliable bonding or fixing means in member assembly or bonding between members . As these double-sided pressure-sensitive adhesive sheets having a substrate, double-sided pressure-sensitive adhesive sheets using nonwoven fabric (see Patent Document 1) or paper as a substrate and double-sided pressure-sensitive adhesive sheets using a plastic film as a substrate are known. Sensitive adhesive sheet. [0003] Recently, electronic equipment such as a m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/02C09J133/00C09J133/08C09J133/02C09J7/22C09J7/26C09J7/38
CPCC09J7/02C09J133/04C09J2201/128C09J2423/006C09J133/06C09J2400/243C09J133/066C09J7/0289C09J2201/606C09J7/0246C09J2433/00B32B5/16B32B27/32C09J2201/622B32B5/18B32B27/065B32B2250/40B32B2255/10B32B2255/26B32B2266/025B32B2307/748B32B2405/00C09J7/38C09J7/22C09J7/26Y10T428/249976C09J2301/124C09J2301/302C09J2301/312C08F220/1804C08F218/08C08F220/06C08F220/20C09J7/385
Inventor 田村彰规中山直树和田博
Owner NITTO DENKO CORP
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