Ethanethiol → Methyl Methacrylate

Participants

Reaction Steps

Methyl methacrylate (2.2 mol) and butyl methacrylate (1.5 mol) are polymerized with azoisobutyronitrile (AIBN) in THF. Thioethanol (0.12 mol) is added as regulator. To this solution are added a trifunctional isocyanate (trimeric hexamethylene diisocyanate; Basonat® HB 100, BASF) (0.12 mol), dissolved in THF, and also dibutyltin dilaurate. The solution is adjusted to a solids content of 50% with THF. In line with the remaining isocyanate content, an OH-terminated polyvinylpyrrolidone (K value about 17, 50% strength in methyl isobutyl ketone) is added. The reaction is continued until isocyanate groups are no longer detectable.

Provenance & Evidence