Using hydrophobic surface-treated fumed silica in combination with a novel non-yellowing amino-functional silane adhesion promoter leads to an optically clear silane-modified polymer-based adhesive system with superior color stability.
The hybrid adhesive and sealant market is projected to grow from $4.6 billion in 2016 to over $7.5 billion by 2022, at a CAGR of 8.6%.1 Silane-modified polymers (SMPs) are the resins of choice for this market, as they provide excellent adhesion and elasticity. SMP-based formulations find applications in construction, automotive, industrial assembly, DIY, and other market sectors.
In SMP-based formulations, amino-functional silanes are typically added as adhesion promoters that also promote crosslinking of the SMP as it cures upon exposure to moisture. In addition, fillers such as fumed silica are used for rheology and mechanical reinforcement, especially when optical clarity is desirable. Both the amino-functional silane and the fumed silica are necessary to achieve the desired appearance and performance of these formulations.