Polymer-related chemicals

Photo base generators (WPBG series)

A Photo base generator is a compound which generates organic base such as amines upon irradiation of light in the UV range. The generated organic base accelerates an anionic UV curing of epoxy resin, sol-gel method, etc.

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Characteristics of anionic polymerization

  • Can be used in air. (No disturbance of curing)
  • Can conduct delay cure. (Anion of active species is not deactivated)
  • Can be used on metal wiring. (Hardly causes metallic corrosion)
Active Species Example of Reaction Inhibition Delay cure Metallic Corrosion
Radical イメージ O2 Non Non
Cationic イメージ H2O Yes Yes
Anionic イメージ Non Yes Non

Different reactions utilizing bases

Organic bases are able to initiate different curing reactions by utilizing their nucleophilicity and basicity. Bases are also available for purposes other than curing agents. For example, as a catalyst for depolymerization and neutralizer for acidic systems.

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WPBG-300

  • Can be employed with cross-linking agents such as thiol or anhydride.
  • Generates a strong base biguanide (pKbH=31.8) and radical upon irradiation.
  • Can be exposed with sensitizer at 365 nm and longer wavelength.
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WPBG-345

  • Shows high stability (pot life) in various compositions.
  • Generates a strong base biguanide (pKbH=31.8) and radical upon irradiation.
  • Can be exposed with sensitizer at 365 nm and longer wavelength.
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WPBG-266

  • Is optimal as catalyst for sol-gel method
  • Generates a strong base biguanide (pKbH=31.8) and radical in high quantum yield upon irradiation.
  • Shows high solubility to various solvents
  • Was co-developed with Dr. Koji Arimitsu, Professor, Tokyo University of Science.
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WPBG-018

  • Light absorption in long-wavelength region, and has excellent solubility.
  • Generates a weak base diethylamine upon irradiation.
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WPBG-027

  • Does not generate carbon dioxide gas at the time of base generation.
  • Generates a weak base piperidine upon irradiation.
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WPBG-140

  • Exhibits absorption region in the vicinity of 350 nm.
  • Generates highly nucleophilic base imidazole and radical upon irradiation.
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WPBG-165

  • Can introduce PBG into polymer by radical polymerization since it has a polymerizable methacrylic group.
  • Generates a weak base 4-methacyloxypiperidine upon irradiation.
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