Self-rolling adhesive film

A film-bonding and winding technology, applied in the direction of bonding method, pressure-sensitive film/sheet, film/sheet release liner, etc., can solve the problems of easy deformation, difficult to recycle, etc., to prevent damage and improve productivity , the effect of reducing peel stress

Inactive Publication Date: 2013-09-11
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because, in order to recover the sheet deformed into a tubular shape by a practically useful method, it is conceivable to use a release belt to recover, to pick up with a robot arm, etc., to blow away with the wind, etc. (Patent Document 3), but in either In the method, when the cylindrical shape is easily deformed due to the stress in these recycling operations, there is a concern that the adhesive sheet will be reattached to the workpiece, etc., making recycling difficult

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0150] (Example of adhesive production)

[0151] Adhesive 1

[0152]Acrylic polymer is obtained by copolymerization of ethyl acetate solution with 0.2 weight part of polymerization initiator 2,2'-azobisisobutyronitrile added to 100 weight parts of a mixture of butyl acrylate:acrylic acid=100:3 (weight ratio). material (weight average molecular weight 1.1 million).

[0153] With respect to 100 parts by weight of the obtained acrylic polymer, 2 parts by weight of an isocyanate compound (manufactured by Nippon Polyurethane Industry Co., Ltd., trade name CORONATE L) and 0.4 parts by weight of an epoxy compound (manufactured by Mitsubishi Gas Chemical Co., Ltd., trade name TETRAD-C) were added. parts by weight to obtain adhesive 1.

[0154] Adhesive 2

[0155] Acrylic polymer is obtained by copolymerization of ethyl acetate solution with 0.2 parts by weight of polymerization initiator benzoyl peroxide added in 100 parts by weight of 2-ethylhexyl acrylate:acrylic acid=100:5 (weig...

manufacture example

[0182] As the rigid film, a polyethylene terephthalate (PET) film (manufactured by Toray Industries, Inc., corona-treated on one side, LUMIRRORS105 (thickness 38 μm)) was used.

[0183] NB300 (manufactured by Dainichi Seika Co., Ltd. with light blue pigment added) was coated on the corona-treated surface side of the rigid film layer with a gravure coater so that the film thickness after drying was 1 to 2 μm, and dried to obtain Rigid film with organic coating.

[0184] The opposite side of the organic coating layer of the aforementioned rigid film layer was bonded with a heat-shrinkable polyester film (manufactured by Toyobo Co., Ltd., SPACECLEAN S7200, film thickness 30 μm, corona-treated on one side) using an adhesive by dry lamination. Treatment) corona treatment surface bonding, the production of self-winding film substrate.

[0185] Among these, the adhesive used for dry lamination used what mixed the Mitsui Chemicals company Takelac A520, Takenate A10, and ethyl acetate...

Embodiment 1

[0188] Adhesive 1 was coated on the silicone-treated surface of PET that had been treated with release silicone using a die coater so that the film thickness after drying was 40 μm, and then attached to the spontaneous winding obtained in the production example. The organic coating side of the film for a self-winding adhesive film was obtained to obtain a self-winding adhesive film 1 .

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Abstract

The invention provides a self-rolling adhesive film. In detachment by self-rolling, if the leading end of the rolling adhesive layer comes into contact with the rear surface thereof, which is not an adhesive layer side of an easily detachable adhesive sheet, the diameter of the circular cross section of a roll cannot be reduced. If so, the detachment angle is lowered. Because of this, it becomes difficult to minimize detachment stress and the amount of remaining glue increases. Furthermore, if rolling into a cylindrical roll is stopped in the middle, for example, the shape of a roll becomes unstable. Consequently, it is difficult to smoothly deform into a cylindrical roll and subsequently collect an easy detachable adhesive sheet. Besides these, since stress is concentrated to a local point, there is a high possibility of breaking a workpiece. A self-rolling adhesive film formed by laminating a substrate film formed of a laminate having at least one thermal contraction film and an adhesive layer on a surface of the substrate film, not formed of a thermal contraction film, in which shear stress between the surface of the thermal contraction film of the substrate film and the adhesive layer thereof is 240 g / mm 2 or less.

Description

technical field [0001] The present invention relates to an adhesive film using a film that is deformed into a cylindrical shape by heating and retains the deformed shape. Background technique [0002] The inventors of the present invention have been developing an easily peelable adhesive sheet based on a laminate of heat-shrinkable film layer / adhesive layer (adhesive layer) / rigid resin film layer (Patent Documents 1 and 2) [0003] This sheet is characterized in that shrinkage stress generated by heating the base material is converted into torque through the laminate, and the PSA sheet can be peeled from the workpiece just like peeling by hand (peel peeling). In addition, the tape shape after peeling was cylindrical. [0004] In order for the sheet to be practically useful, it is necessary to collect the cylindrical object easily, and more specifically, it is necessary to maintain the state in which the sheet is peeled off into a cylindrical shape. This is because, in orde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/02C09J7/29
CPCH01L21/6836H01L2221/68318H01L2221/68327H01L2221/6834H01L2221/68386C09J7/40C09J7/29Y10T428/1476C09J7/38C09J5/00C09J2203/326B32B33/00
Inventor 木内一之西尾昭德川西道朗
Owner NITTO DENKO CORP
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