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Application 01  Pressure Sensitive Adhesive

Application to Pressure Sensitive Adhesive

In here introduce the pressure sensitive adhesive which advances development making use of our living radical polymerization method. It expects nonconventional function occurrence by controlling primary structure of the polymer. Basic concepts are

  1. The resin does not contain the small molecular weight oligomer component because the high-level molecular weight and molecular weight distribution are controllable. Since it does not contain the oligomer component, which causes contaminant when it reuses as tearing off adhesion tape, stain resistance improves.
  2. The functionalized monomers such as carboxy and hydroxyl group are usually used for adhesive as a cross-linking component. Because the controlled polymerization method is used, it equalizes the functional group necessary for cross-linking and controls its system.
  3. In existing polymerization method, duplication of the homo-polymer which not contain cross-linking component causes adhesive residue and decreases heat resistance, occur shown red circle in below. In TERP method, because well controlled functional group is installed, non-cross-linking polymer does not exist and adhesive heat resistance itself improves.
  • The molecular weight is even → Improvement of stain resistance (Adhesive deposit of oligomer component)
  • The functional group component quantity is even → Control the cross-linking degree
  • Non homo- polymer → "Heat-resistant improves (Non-cross-linking polymer)"

Comparison with Free Radical Polymerization

Below data is the comparison result of adhesion properties of resin between the synthesized former free radical polymerization method used the most general normal butyl acrylate as pressure sensitive adhesive and living radical polymerization method.

The condition of both molecular weight controls are seen on right figure. In this figure expresses the narrower the width of up and down, the superior in control of molecular weight distribution. Former method lined in blue explains its width of up and down is very large that means consisting of wide range of molecular distribution from low to high molecule, but if our method (TERP)is used, obtain the well controlled molecular weight distribution monodisperse polymer.

It is not actual adhesive combination but purpose of understand the characteristics of resin itself, compared adherence of resin not using cross-linking. As the characteristic of resin using TERP method, because cross-linking part and oligomer component does not exist, compared with existing one, it is superior in cohesion. As a result, retention has improved extremely from 2 to 26 minutes. Thus, the high performance adhesive development becomes possible.

Comparison between TERP and Free Radical Polymerization

Comparison adhesive properties of polybutylacrylate

 
Polymerization Method
TERP
Free Radical
Polymerization
Mw 581,600 703,800
PDI 1.24 3.44
Peel Strength
N/25mm
7.4 16.6
Ball Tack
(Ball No./32)
5 6
Holding Power
40℃×1kg
26min 2min
Comparison between TERP and Free Radical Polymerization

Because TERP item has no oligomer, excellent at cohesion
→ High performance adhesive development

Control of Adhesion Property

By utilize the feature of controllability of functional group and superiority in cohesive along with our polymerization technology that polymerize monomer having various structures, control the adhesion physical properties adjusted to the function of the various products.
For example, with basic combination as a foundation, those make adhesion high or low or adhesive that not changing the ball tack but only adhesion change, makes various adhesion physical properties control possible.

Control of Adhesion Property

Controls of molecular weight and polymer composition makes various properties control possible.

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