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Radiation curable pressure sensitive adhesive sheet

A pressure-sensitive adhesive, radiation curing technology, used in film/sheet adhesives, adhesives, non-polymer organic compound adhesives, etc. To achieve the effect of good hardness and good fluidity

Active Publication Date: 2014-04-09
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If a pressure-sensitive adhesive with poor stress relief is used, even a material thickness ten or more times the height of the three-dimensional surface feature may not be applied with the required quality

Method used

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  • Radiation curable pressure sensitive adhesive sheet
  • Radiation curable pressure sensitive adhesive sheet
  • Radiation curable pressure sensitive adhesive sheet

Examples

Experimental program
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Effect test

example

[0107] Hereinafter, the present invention is described in further detail using examples, but the present invention is not limited by these examples.

[0108] Monomer and Initiator Abbreviations

[0109] 2-EHA: 2-ethylhexyl acrylate

[0110] ISTA: Isostearyl acrylate (available from Osaka Organic Chemical Industry Ltd.)

[0111] AA: Acrylic

[0112] AEBP: 4-Acryloyloxyethoxybenzophenone

[0113] DCP-A: Tricyclodecane dimethanol diacrylate

[0114] DCP-M: Tricyclodecane dimethanol dimethacrylate

[0115]SR-399: dipentylerythritol pentaacrylate (available from Sartomer)

[0116] V-65: thermal initiator (2,2'-oxazolbis(2,4-dimethylvaleronitrile)) (available from Wako Pure Chemical Industries, Ltd.)

[0117] MOI: 2-isocyanatoethyl methacrylate (available from Showa Denko)

[0118] TPO: 2,4,6-trimethylbenzoyldiphenylphosphine oxide

[0119] EtOAc: ethyl acetate

[0120] MEK: methyl ethyl ketone

[0121] Preparation process

preparation example 1

[0123] A pressure-sensitive adhesive sheet (PSA sheet 1) was prepared as follows. Acrylic copolymers were synthesized comprising monomers of acrylates with UV crosslinkable sites as radiation reactive sites. 4-Acryloyloxyethoxybenzophenone was used as acrylate with UV crosslinkable sites.

[0124] Prepare a mixture of 2-EHA / ISTA / AA / AEBP at a ratio of 37.5:50.0:12.5:0.95 (by mass), and then use ethyl acetate / methyl ethyl ketone (EtOAc:MEK = 20 mass %:80 mass % %) mixed solvent to obtain a monomer concentration of 45% by mass. Next, V-65 was added as an initiator in an amount of 0.2% by mass relative to the mass of the monomer component, and the system was purged with nitrogen for 10 minutes. The reaction was allowed to proceed for 24 hours at 50 °C in a constant temperature bath to obtain a clear viscous solution. The obtained acrylic copolymer (polymer 1) had a weight average molecular weight of 210,000 (polystyrene equivalent, measured by gel permeation chromatography).

...

preparation example 2

[0128] A transfer adhesive strip (PSA sheet 2) was prepared in the same manner as PSA sheet 1, except that the ratio of solid polymer component to DCP-A was adjusted to 90:10 (by mass).

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Abstract

To provide a radiation curable pressure sensitive adhesive sheet capable of yielding both a pressure sensitive adhesive sheet with good initial adhesion to an adherend before irradiation and a pressure sensitive adhesive sheet with good rigidity after irradiation. A radiation curable pressure sensitive adhesive sheet includes a (meth)acrylic copolymer having a radiation reactive site and a plasticizer capable of bonding with the (meth)acrylic copolymer upon being irradiated.

Description

technical field [0001] The present invention relates to a radiation curable pressure sensitive adhesive sheet, a laminate and a method for its preparation. Background technique [0002] Image display modules of electronic devices such as portable phone terminals, computer monitors, etc., and optical members such as touch panels generally have glass or plastic films laminated thereon as surface protection layers. Such a surface protection layer is fixed to the image display module or the touch panel by applying a frame-shaped tape or an adhesive to the outer blank area of ​​the image display portion or outside the effective operating area of ​​the touch panel. Therefore, a gap is formed between the image display portion or the effective operation area of ​​the touch panel and the surface protection layer. [0003] In recent years, a method of improving transparency and increasing image clarity has been widely used, in which the gap between the surface protection layer and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/00C09J7/02C09J133/04B32B7/12
CPCC09J133/14C08L2312/06C08F220/18C09J7/0217C09J133/08B32B7/12C09J4/06C09J2301/302C08F220/1808C08F220/1818C09J7/385Y10T428/2891Y10T428/31938C08F220/06C08F220/281C09J7/29C09J133/06
Inventor 诹访敏宏木下康宏
Owner 3M INNOVATIVE PROPERTIES CO
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