Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
PROCESS FOR PREPARING POLYCARBONATE
Document Type and Number:
WIPO Patent Application WO2003020793
Kind Code:
A3
Abstract:
A method for preparing polycarbonates by melt polycondensation of a dihydroxy compound and a diarylcarbonate compound in the presence of an alkaline catalyst is described. A branching quencher compound is added to an intermediate polycarbonate produced by the melt polycondensation reaction in an amount effective to inhibit or prevent the formation of branching species during a subsequent finishing process. Adding the branching quencher compound to the product of the melt polycondensation reaction produces finished polycarbonates with reduced branching species, high ductility and impact strength.

Inventors:
VOLKERS ANDRE A
PUYN MARCEL ANTONIUS FRANSISCU
Application Number:
PCT/US2002/024907
Publication Date:
August 28, 2003
Filing Date:
August 06, 2002
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
GEN ELECTRIC (US)
International Classes:
C08G64/30; (IPC1-7): C08G64/00
Foreign References:
US6136945A2000-10-24
US6228973B12001-05-08
EP0738579A21996-10-23
Download PDF:
View/Download PDF      PDF Help



 
Previous Patent: PROCESS FOR MAKING REACTIVE UNSATURATED POLYESTER RESINS FROM 2-METHYL-1,3-PROPANEDIOL

Next Patent: DOUBLE METAL CYANIDE CATALYSTS FOR PRODUCING POLYETHER POLYOLS