Process for Preparing Polycarbonates by Polymerization of Five-Membered-Ring Cyclic Carbonates
申请人:TOTAL RESEARCH & TECHNOLOGY FELUY
公开号:US20160068630A1
公开(公告)日:2016-03-10
A process for the preparation of polycarbonates may include ring-opening polymerization of five-membered cyclic carbonates in the presence of a catalyst; a compound of formula (I), stereoisomers, racemics, or mixtures thereof; and optionally cyclic esters, stereoisomers, racemics, or mixtures thereof. Formula (I) is:
Each dotted bond “a” and “b” is a solid bond, a wedged bond, or a hashed wedged bond. R
21
and R
22
, taken together with the carbon atoms 4 and 5 of the cyclic carbonate, may form a ring. The ring may be a C
5-9
cycloalkylene, C
5-9
cycloalkenylene, or C
6-12
arylene. The ring may optionally be substituted with substituents including halo, hydroxyl, C
1-6
alkyl, haloC
1-6
alkyl, C
1-6
alkoxy, haloC
1-6
alkoxy, C
6-12
aryl, C
1-6
alkylthio, carboxyl, C
1-6
alkoxycarbonyl, C
1-6
alkylcarbonyloxy, amino; or mono- or di-C
1-6
alkylamino.