Typical Formulation Ingredients
Phase
Ingredient
Parts by weight
A
Silane end-capped polyurethane (Polymer ST 77 from Evonik )
A
Plasticizer: Elatur CH from Evonik (1,2-Cyclohexanedicarboxylic acid, 1,2-diisononyl ester)
A
Filler: precipitated calcium carbonate (0.07µm)
A
Aminosilane adhesion promoter (Dynasylan 1146, Evonik)
A
Drying agent (Dynasylan VTMO, Evonik)
A
Catalyst: di-octyl-di-acetonate
A
Other additives: antioxidants, thixotropic fillers, pigments, etc.
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Typical Properties
Excellent primerless adhesion to glass, aluminum, and other metals
Unusually good adhesion to plastics
Excellent durability and joint movement
Good tensile strength and elasticity
Excellent solvent resistance
Isocyanate-free urethane performance
Resulting Properties
Silane end-capped polyurethane resins are used for manufacturing one-part, moisture-curing sealants, and adhesives. Plasticizer-free and of relatively low viscosity, it is an excellent base resin for low modulus sealants in building and construction applications where good elastic recovery is required. The table above provides a generic starting formulation.