A branched polycarbonate and processes for its preparation are disclosed. The polycarbonate contains structural units conforming to
in which R
1
, R
2
, R
3
and R
4
mutually independently denote C
1
-C
10
alkyl, R
5
, R
6
and R
7
mutually independently denote hydrogen or C
1
-C
10
alkyl, or R
1
and R
2
, and R
3
and R
4
, with the carbon atom to which they are attached, form a C
5
-C
10
cycloalkyl group, wherein the cycloalkyl group may be substituted.
本发明公开了一种分支聚
碳酸酯及其制备方法。该聚
碳酸酯包含符合以下结构单元的结构单元:其中R1、R2、R3和R4相互独立地表示C1-C10烷基,R5、R6和R7相互独立地表示氢或C1-C10烷基,或者R1和R2,以及R3和R4与它们所连接的碳原子形成一个C5-C10环烷基,其中该环烷基可能被取代。