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Release Coatings


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Cure Chemistries

Dow Corning offers two thermal cure chemistries for silicone release coating products:

  • Addition Cure, catalyzed by platinum or rhodium
  • Condensation Cure, catalyzed by tin

 

Addition Cure

Addition-cure chemistry has been successfully applied to solventless, solvent-based and emulsion coatings alike. In this cure system, the addition of a silicon hydride group across a vinyl (or hexenyl) group is catalyzed by a few parts per million of an organoreactive platinum (or rhodium) complex. There are no "leaving" groups, so nothing is evolved during cure. And "post-cure" (if any) is minimal.

 

Condensation Cure

The tin-catalyzed condensation reaction has long been the "workhorse" of the release coating industry. Coatings consist of a silanol-functional polymer, a diluent and a silicon-hydride crosslinker. Cure is initiated at elevated temperatures by high levels of a tin-salt catalyst. Cure takes place relatively slowly - generally speaking, the lower the temperature, the slower the cure. Once initial cure is complete, a period of post-cure is required to complete the reaction.

 

 

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Dow Corning lab

  1. Cure Chemistries


  2. Platinum


  3. Rhodium Catalyst


  4. Tin Catalyst


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