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Titanate and Zirconate Coupling Agents

SpecialChem / Dec 8, 2004

Coupling agents and adhesion promoters represent a group of specialty bifunctional compounds that can react chemically with both the substrate and the adhesive. The term "coupling agent" refers generally to additives that work on fillers and reinforcements within a resin matrix to improve properties such as dispersion stability, viscosity, etc. In this case, the primary substrate is the filler or reinforcement. The term "adhesive promoter" generally refers to a material that can be incorporated into an adhesive formulation or as a surface primer to enhance adhesion at the joint interface. Very often the same materials can function as both "coupling agents" and "adhesion promoters". The most well known of these compounds is the organosilanes. These have been used extensively as internal additives and primers for adhesives and sealants to improve adhesion, compounding properties, and as a crosslinking agent.1 Titanates and zirconates are less well-recognized compounds that also perform as coupling agents and / or adhesion promoters.

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