Process for making low viscosity, fast curing silane terminated polymers

摘要

Methods of producing a composition comprising a crosslinkable silane-terminated polymer having at least one crosslinkable silyl group in each molecule are provided. The method may comprise providing a polymer having at least one unsaturated group and at least one alcohol hydroxyl group in each molecule and having a number average molecular weight between about 100 and about 5,000, adding to the polymer a compound having a hydrogen-silicon bond and a crosslinkable silyl group in each molecule and a hydrosilylation catalyst to thereby carry out a hydrosilylation reaction to form a composition comprising hydrosilylated polymers, wherein the hydrosilylation reaction has a hydrosilylation efficiency greater than 50% as determined by 1H-NMR, capping the hydrosilylated polymers by adding the hydrosilylated polymer to at least one isocyanate at an index of between about 100 and about 250, and reacting the isocyanate capped hydrosilylated polymer with a polyol having a nominal functionality of at least 2 to form the composition comprising a crosslinkable silane-terminated polymer.

主权项

1. A method of producing a composition comprising a crosslinkable silane-terminated polymer having at least one crosslinkable silyl group in each molecule, the method comprising:
providing a polymer having at least one unsaturated group and at least one alcohol hydroxyl group in each molecule and having a number average molecular weight between about 100 and about 5,000; adding to the polymer a compound having a hydrogen-silicon bond and a crosslinkable silyl group in each molecule and a hydrosilylation catalyst to thereby carry out a hydrosilylation reaction to form a composition comprising hydrosilylated polymers, wherein the hydrosilylation reaction has a hydrosilylation efficiency greater than 50% as determined by 1H-NMR; capping the hydrosilylated polymers by adding the hydrosilylated polymer to at least one isocyanate at an index of between about 100 and about 250; and reacting the isocyanate capped hydrosilylated polymer with a polyol having a nominal functionality of at least 2 to form the composition comprising a crosslinkable silane-terminated polymer.