Well‐characterized polyfunctional aliphatic isocyanates were obtained in high purity and quantitative yield by the hydrosilylation of m‐isopropenyl‐α,α‐dimethylbenzyl isocyanate (m‐TMI) with cyclic and acyclic hydrogementhylsiloxance. The products were characterized by 1H‐ and 13C‐NMR, IR, and GPC, and all result exclusively from ß‐addition to m‐TMI. Polymers with SiH Groups are also effective hydrosilylating agents of m‐TMI. The isocyanato siloxanes can be used as precursors for star and network polymers as well as other poly‐functional reagents, and examples of reactions with methoxy polyethylene glycol and with amine‐containing compounds are discussed.
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Zhou et al. (1991) studied this question.
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