申请人:Dubois Philippe Ghilain
公开号:US20150126703A1
公开(公告)日:2015-05-07
A process for the preparation of polyesters or polycarbonates including (i) the provision of cyclic esters or cyclic carbonates, (ii) polymerizing by ring-opening in the presence of a betaine based metal-free catalyst showing formula
−
X—R
1
—Y
+
(R
2
)
3
wherein X is S, O or Se,
Y is N or P,
R
1
is linear or cyclic alkyl or aryl, and
R
2
is linear or cyclic alkyl.
and under polymerizing conditions in the presence of an alcohol or amine based initiator.