US 20090117314Al  c19)  United States  c12)  Patent Application Publication  Haese et al.  c10)  Pub. No.: US 2009/0117314 Al  (43)  Pub. Date:  May 7, 2009  (54)  PROCESS FOR THE PREPARATION OF  POLYCARBONATE BY THE MELT  TRANSESTERIFICATION METHOD  (75)  Inventors:  Wilfried Haese,  Odenthal (DE);  Alexander Meyer,  Duesseldorf  (DE)  (73)  Assignee:  Bayer MaterialScience AG,  Leverkusen (DE)  (21)  Appl. No.:  12/266,152  (22)  Filed:  Nov. 6, 2008  (52)  U.S. Cl.  .........  428/64.7;  528/302; 528/274; 528/275  (30)  Foreign Application Priority Data  (51)  Int. Cl.  B32B 3102  C0SG 64130  (2006.01)  (2006.01)  Publication Classification  Nov. 7, 2007  (DE) ......................... 102007052968.8  Correspondence Address:  CONNOLLY BOVE LODGE  &  HUTZ, LLP  POBOX2207  WILMINGTON, DE 19899 (US)  The invention relates to a process for the preparation of poly› carbonate by the melt transesterification method, polycarbon› ate having a small buildup of electrostatic charge and obtain› able by this process and shaped articles or extrudates, in  particular optical data stores or diffuser discs, comprising this  polycarbonate.  (57)  ABSTRACT 