Method for measuring the degree of crosslinking of pressure sensitive adhesive

1. A method for measuring the degree of crosslinking of pressure sensitive adhesive, comprising:

providing a transparent substrate coated with a pressure sensitive adhesive;

immersing the transparent substrate in a solvent;

measuring the haze of the transparent substrate; and

comparing the obtained haze with a predetermined reference, thereby concluding the degree of crosslinking of the pressure sensitive adhesive.

2. The method as claimed in claim 1 , wherein the transparent substrate comprises substrate employed in LCD or transparent optical film.

3. The method as claimed in claim 1 , wherein the transparent substrate is glass.

4. The method as claimed in claim 1 , wherein the transparent substrate comprises triacetate cellulose film, release film, antireflection film, or polarizing film.

5. The method as claimed in claim 1 , wherein the pressure sensitive adhesive comprises natural rubber pressure sensitive adhesive, synthetic rubber pressure sensitive adhesive, or alkene polymer pressure sensitive adhesive.

6. The method as claimed in claim 1 , wherein the pressure sensitive adhesive is polyacrylate.

7. The method as claimed in claim 1 , wherein the transparent substrate is immersed in the solvent for 2˜4 min.

8. The method as claimed in claim 1 , wherein the solvent comprises alcohol, alkane, ether, or ester.

9. The method as claimed in claim 1 , wherein the solvent comprises methanol, ethanol, n-propanol, i-propanol, n-butanol, n-hexane, ethyl ether, tetrahydrofuran, or ethyl acetate.

10. The method as claimed in claim 1 , wherein the predetermined reference indicates the relationship between haze and gel fraction.