A method of producing a porous sheet, which comprises the steps consisting of preparing a dispersion having ultra-high-molecular-weight polyethylene particles dispersed in a solvent, applying the dispersion onto a film to form a coating layer thereon, sintering the coating layer, and removing the solvent contained in the coating layer.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a scanning electron microgram of a section of a porous sheet obtained in Example 1.
FIG. 2 is a scanning electron microgram of a section of a porous sheet obtained in Comparative Example 1.
Claims
1. A method of producing a porous sheet, comprising:
preparing a dispersion having ultra-high-molecular-weight polyethylene particles dispersed in a solvent,applying the dispersion onto a film to form a coating layer thereon,sintering the coating layer, andremoving the solvent contained in the coating layer.
2. The method of producing a porous sheet according to claim 1, wherein the ultra-high-molecular-weight polyethylene particles used are those having an average particle diameter of 100 μm or less.
3. The method of producing a porous sheet according to claim 1, wherein the solvent used has a boiling point higher than the melting point of the ultra-high-molecular-weight polyethylene particles and is low solubility with the ultra-high-molecular-weight polyethylene particles.
4. A porous sheet obtained by the method of producing a porous sheet according to claim 1, wherein the surface roughness (Ra) thereof is 0.5 μm or less.
5. The porous sheet according to claim 4, which is used in suction fixation of a member to be adsorbed.
6. The method according to claim 1, wherein said sintering step occurs at a calcination temperature of 130-200° C.
7. The method according to claim 3, further comprising extracting said solvent with a second solvent.
8. The method according to claim 1, wherein the thickness of the resulting porous sheet is from 0.1 mm to 3.0 mm.
9. The method according to claim 1, wherein the porosity of the resulting porous sheet is from 10% to 70%.
10. The method according to claim 4, wherein the Ra is 0.1 μm to 0.4 μm.
11. The method according to claim 1, wherein the adhesion of the resulting porous sheet is from 2.0 N/19 mm to 0.3 N/19 mm.
12. The method according to claim 1, wherein the air permeability of the resulting porous sheet is from 0.3 cm3/cm2·sec to 1.0 cm3/cm2·sec.
13. The method according to claim 1, wherein the ultra-high-molecular-weight polyethylene particles have an average particle diameter of 1-50 μm.
14. The method according to claim 1, wherein the thickness of the coating layer is from 10 μm to 1000 μm.
15. The method according to claim 1, wherein the dispersion further comprises a surfactant.
16. The method according to claim 1, wherein the resulting porous sheet further comprises an antistatic agent impregnated therein.
17. The method according to claim 3, wherein the viscosity of the solvent is 0.1-20 Pa·s.
Patent Application
20070202298
