(10)  Patent No.:  US 7,814,626 B2  (45)  Date of Patent:  Oct. 19, 2010  c12)  United States Patent  Fischer et al.  (54)  PROCESS FOR THE PREPARATION OF  POLYCARBONATE BY THE MELT  TRANSESTERIFICATION PROCESS  (75)  Inventors:  Pete Fischer,  Cologne (DE);  Wilfried  Haese,  Odenthal (DE);  Alexander  Meyer,  Duesseldorf (DE)  (73)  Assignee:  Bayer MaterialScience AG,  Leverkusen  (DE)  ( *)  Notice:  Subject to any disclaimer, the term ofthis  patent is extended or adjusted under 35  U.S.C. 154(b) by  O  days.  (21)  Appl. No.:  12/117, 798  (22)  Filed:  May 9, 2008  (51)  Int. Cl.  C0SG 64100  (2006.01)  C08G 63/02  (2006.01)  (52)  U.S. Cl.  ......................  28/196;  264/176.1; 264/219;  264/328.1; 428/64.4; 428/451; 524/91; 524/154;  524/306; 524/317; 524/451; 524/611; 528/198  (58)  Field of Classification Search  .............. 264/176.1,  264/219, 328.1; 428/64.4; 524/91, 154,  524/306, 317,451, 611; 525/155, 156, 462;  528/196, 198  See application file for complete search history.  FOREIGN PATENT DOCUMENTS  (57)  ABSTRACT  20 Claims, No Drawings  U.S. PATENT DOCUMENTS  (56)  References Cited  (65)  Prior Publication Data  (30)  Foreign Application Priority Data  6,887,970 B2  5/2005 Kratschmer et al.  7,250,483 B2  7/2007 Heuer et al.  7,259,223 B2  8/2007 Brack et al.  7,279,544 B2  10/2007 Hucks et al.  7,425,358 B2  *  9/2008 Heuer et al. ............... 428/64.7  2005/0288407 Al  12/2005 Heuer et al.  2006/0132912 Al  6/2006 Haese et al.  2006/0134366 Al  6/2006 Haese et al.  2006/0135735 Al  6/2006 Meyer et al.  2006/0135736 Al  6/2006 Meyer et al.  2006/0155098 Al  7/2006 Kauth et al.  DE  1031512  6/1958  DE  2119799  11/1972  DE  3832396 Al  2/1990  DE  4438545 Al  5/1996  DE  4447422 Al  7 /1996  DE  10100404 Al  7/2002  DE  10357161 Al  6/2005  DE  102004061715 Al  7/2006  DE  102004061754 Al  7/2006  DE  60126431 T2  8/2007  EP  0435124 A2  7 /1991  EP  0922728 A2  6/1999  EP  0980861 Al  2/2000  EP  1253163 Al  10/2002  EP  1304358 A2  4/2003  EP  1609818 A2  12/2005  EP  1612213 Al  1/2006  EP  1612231 Al  1/2006  FR  1561518  3/1969  GB  1229482  4/1971  JP  62-207358  9/1987  WO  WO-99/28370 Al  6/1999  WO  WO-00/50488 Al  8/2000  WO  WO-02/077067 A2  10/2002  WO  WO-03/031497 Al  4/2003  3,022,272  A  2/1962 Schnell et al.  5,340,905  A  8/1994 Kuhling et al.  5,399,659  A  3/1995 Kuhling et al.  5,668,202  A  9/1997 Hirata et al.  6,022,943  A  2/2000 Inoue et al.  6,262,218 Bl  7/2001 Inoue et al.  6,265,525 Bl  7/2001 Kinoshita et al.  6,300,459 Bl  10/2001 Kaneko et al.  6,403,754 Bl  6/2002 McCloskey et al.  6,630,563 B2  10/2003 Hucks et al.  6,703,473 B2  3/2004 Hucks et al.  US 2008/0319156Al  Dec. 25, 2008  May 11, 2007  (DE)  ....................... 10 2007 022 130  * cited by examiner  Primary Examiner-Terressa  M Boykin  (7 4  )Attorney, Agent, or Firm----Connolly  Bove Lodge & Hutz  LLP  The invention provides a process for the preparation of poly› carbonate by the melt transesterification process, polycarbon› ate having a low electrostatic charge obtainable by this pro› cess, and moldings or extrudates, in particular optical data  storage media or light-diffusing plates, made from this poly› carbonate.  US007814626B2 