content_image/937874.jpg
# c19) United States c12) Patent Application Publication 

# Haese et al. 

# (54) PROCESS FOR THE PREPARATION OF POLYCARBONATE BY THE MELT TRANSESTERIFICATION METHOD 

(75) Inventors: Wilfried Haese, Odenthal (DE); Alexander Meyer, Duesseldorf (DE) 

Correspondence Address: CONNOLLY BOVE LODGE & HUTZ, LLP POBOX2207 WILMINGTON, DE 19899 (US) 

(73) Assignee: Bayer MaterialScience AG, Leverkusen (DE) 

(21) Appl. No.: 12/266,152 

(22) Filed: Nov. 6, 2008 

<img src='content_image/937874.jpg'>

## (30) Foreign Application Priority Data 

(51) Int. Cl. B32B 3102 C0SG 64130 (2006.01) (2006.01) 

(52) U.S. Cl. ......... 428/64.7; 528/302; 528/274; 528/275 

## (57) ABSTRACT 

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. 

US 20090117314Al 

# c10) Pub. No.: US 2009/0117314 Al 

# (43) Pub. Date: May 7, 2009 

Nov. 7, 2007 (DE) ......................... 102007052968.8 

## Publication Classification 

