Novel initiator for polymerizing polyisocyanate
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United States of America Patent
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Issued Date -
Feb 19, 2004
app pub date -
Aug 15, 2003
filing date -
Apr 17, 2002
priority date (Note) -
Abandoned
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Abstract
The present invention relates to a novel initiator for polymerizing polyisocyanate, more particularly to a metal amidate represented by the following Formula 1, which is useful for polymerizing polyisocyanate having a variety of functional groups, including alkyl and aryl, by anionic living polymerization. While the conventional initiators caused generation of dimer and trimer byproducts, the new initiator of the present invention facilitates polymerization of polyisocyanates having a variety of functional groups, including alkyl and aryl, since the amidate anion has a low reactivity, so that the control of initial initiation reaction rate and chain growth rate is easy, and the control of monodispersity and molecular weight is facile: 1 wherein M is an alkali metal such as Li, Na, K, and Cs, and R1 and R2 are independently an alkyl or aryl group group.
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