TOKYO OHKA KOGYO CO., LTD. (TOK) provides chemical products, such as photoresist, and equipment for semiconductors and displays.

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New Business Field


Under the “Challenge for the Future!” slogan, TOK has set up the New Business Development Dept. combined sales and technical division.
TOK offers unique and high value-added materials ,using our functional polymer design/manufacturing technologies cultivated in photolithography field, through open innovation with our customers and third parties.

Porous Polyimide Film

Unique and Uniformed pore structure



  • Open cell structure of spherical pores
  • Extremely narrow pore size distribution
  • High porosity (~80%)
  • Low dielectric constant
  • Thickness (10~100μm)


  • Membrane for high efficiency removal
  • Low dielectric material for high frequency printed circuit board
  • Thermal insulation material

Film Performance

ItemUnitμm Porenm Pore
Thermal   decomposition571571
Dielectric1 GHz1.495
10 GHz1.461

Membrane for high efficiency removal

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HOME Products New Business Field Materials Porous Polyimide Film