Sila-Ace® (Coupling Agent)


As shown above in a general schematic structure, silicon is linked on one side via a carbon chain (the R organic radical) with functional groups (for example, vinyl, amino, chloro, epoxy, methacryroxy, etc.) that can react with organic materials such as polymers, and on the other side with a hydrolysable group X (for example, chloro, methoxy, ethoxy, methoxyethoxy, etc.) that can react with inorganic materials such as glass or silica. Silane coupling agents are widely used as mediators binding organic materials to inorganic materials. They have the characteristic ability of improving electrical properties and mechanical strength of materials in wet or ordinary conditions. Please see our product list for a complete listing of silane coupling agents available from JNC. The use of JNC’s silane coupling agents in next generation synthetic rubber polymers used for eco-tires is now attracting much attention. Other applications include: resin concrete, sealant primers, shell molds, brake linings, polishers, paints, adhesives, printing inks, dyeing auxiliary agents, anti-oxidants for copper, flooring materials of vinyl chloride, etc.

The coupling mechanism is illustrated as follows.

A silane coupling agent is at first hydrolyzed to produce silanol, which forms metal-oxygen or siloxane bond with the inorganic material on one side. On the other side, R, which has functional groups, reacts with the organic material to produce a chemical bond. As a result, the organic material and the inorganic material are tightly bound to each other.


Alkoxy groups of silane coupling agents react with water to form silanol groups which form siloxane bonds through a condensation reaction.

*Unsaturated silane Radical polymerization