Silyl modified polymers

Silyl modified polymers (SMP, also silane-modified polymers, modified-silane polymers, silane terminated polymers, etc.) are polymers (large, chained molecules) terminating with a silyl group. SMPs are the main components in solvent-free and isocyanate-free sealant and adhesive products.[1] Typically the sealant products manufactured with silyl modified polymers have good adhesion on a wide range of substrate materials, and have good temperature and UV resistance.

Curing process

The products cure from a liquid or gel state to a solid. Curing entails crosslinking by the hydrolysis of silyl ethers:

2 RSi(OCH₃)₂R' + H₂O → [RSi(OCH₃)R']₂O + 2 CH₃OH

This hydrolysis generates siloxane linkages. A catalyst is required for this condensation process.

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References

Jeffrey D. Umpleby "Polymer composition" U.S. patent 4574133. 1986.

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[1] Jeffrey D. Umpleby "Polymer composition" U.S. patent 4574133. 1986.