Improve the Strength of your PU with Endcappers

Silane-terminated polyurethanes can be prepared by reacting traditional NCO-terminated urethane prepolymers with secondary aminosilanes, such as Dynasylan^® 1189 or Dynasylan^® 1124.

Both aminosilanes react very fast with free isocyanate groups and lead to a high converted silane-endcapped product. Side reactions can be significantly reduced.

Besides, silane endcappers help formulators to comply with REACH regulation by neutralizing any free NCO groups.

Dynasylan^® 1189 is the most recommended silane for endcapping Polyurethanes. It leads to colourless low-viscosity PU prepolymers with improved UV stability and reduced yellowing tendency of sealants. Another benefit of Dynasylan^® 1189 is that it does not contain traces of toxic aniline.

Examples of applications where these Dynasylan^® are used includes polyurethanes for structural adhesives, parquet adhesives and over-paintable hybrid sealant.