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

HOME Products New Business Field Materials Porous Polyimide Film

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
  • Very uniformed pore size
  • High porosity ⇒ Good liquid/gas flow, Low dielrctric
  • Low dielectric constant ⇒ Insulation charastric, Improvement of signal transmission


  • Separation membrane
  • Low dielectric constant material 
  • Soundproofing material
  • Thermal insulation material

Film Performance

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

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HOME Products New Business Field Materials Porous Polyimide Film