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Silylated polyurethanes

SpecialChem / Jan 29, 2003

Michel Biron. Introduction What are SPUs? Why use SPU? How to obtain SPU. General guidelines for the formulation of a one-component SPUR sealant Effect of calcium carbonate filler Effect of adhesion promoter level Effect of adhesion promoter nature Why use a water scavenger? SPU durability Consumption of polyurethane is estimated at more than 7 million cubic tons per year. However there is a need to extend their performance and use by: * Replacing the NCO curing chemistry with another one more environmentally frienly and less reactive with a wider range of additives * Broadening the range of rigidity or flexibility * Improving the adhesion to modern substrates such as plastic ones. One way to satisfy these requirements is the replacement of the NCO groups by silane terminal groups that to create silylated polyurethanes (SPU) What are the SPUs? An adequate organosilane can react with an urethane prepolymer to produce a silane endcapped polyurethane or silylated polyurethane (SPU). In the presence of a suitable catalyst, moisture promotes the reaction of silane endgroups to form a three-dimensional network with Si-O-Si bridges.

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