1
Hans Peter Brack, Dennis Karlik, Hendrik Verhoogt, Johannes Martinus Dina Goossens: Process for preparing branched aromatic polycarbonates. General Electric Company, August 20, 2002: US06437083 (67 worldwide citation)

A process for the production of a branched aromatic polycarbonate that includes adding a branching agent to a polycarbonate oligomer, and producing a branched aromatic polycarbonate having a melt index ratio greater than an aromatic polycarbonate produced from the polycarbonate oligomer without the ...


2
Dennis Karlik, Hans Peter Brack, Hendrik Verhoogt, John Patrick Lemmon, Jan Henk Kamps, Willem Lodewijk Sederel, Johannes Martinus Dina Goossens: Process for the production of branched melt polycarbonate by late addition of fries-inducing catalyst. General Electric Company, Oppedahl & Larson, January 7, 2003: US06504002 (64 worldwide citation)

The invention relates to a method for the production of a branched polycarbonate composition, having increased melt strength, by late addition of branch-inducing catalysts to the polycarbonate oligomer in a melt polycondensation process. Surprisingly, it has been found that by adding branch-inducing ...


3
Hans Peter Brack, Dennis Karlik, Theodorus Lambertus Hoeks, Irene Dris, John Morgan Whitney: Method for end-capping polycarbonate resins and composition for use in same. General Electric Company, Oppendahl & Larson, March 16, 2004: US06706846 (36 worldwide citation)

A method for end-capping polycarbonate resins, comprising the step of processing a mixture comprising a polycarbonate having free hydroxyl-end groups and an end-capping reagent in a melt transesterification reaction to produce a polycarbonate resin, wherein the end-capping reagent comprises a mixtur ...


4
Hans Peter Brack, Dennis Karlik, Theodorus Lambertus Hoeks, John Morgan Whitney: Method and system for preparing a polycarbonate, copolymerization reagent and polycarbonate. General Electric Company, Oppedahl & Larson, June 8, 2004: US06747119 (28 worldwide citation)

A method for preparing a polycarbonate comprises preparing a free hydroxyl-containing polycarbonate and reacting the hydroxyl-containing polycarbonate with a mixture of (B) a symmetrical optionally activated aromatic carbonic acid diester and (C) an optionally substituted aromatic hihydroxy compound ...


5
Hans Peter Brack, James Anthony Cella, Dennis Karlik, Paul Michael Smigelski Jr: Method for end-capping polycarbonate resins and composition for use in same. General Electric Company, Oppedahl & Larson, December 31, 2002: US06500914 (26 worldwide citation)

A method for end-capping polycarbonate resins, comprising the step of processing a mixture comprising a polycarbonate having free hydroxyl-end groups and an end-capping reagent in a melt transesterification reaction to produce a polycarbonate resin, wherein the end-capping reagent comprises a mixtur ...


6
Hans Peter Brack, Daniel Joseph Brunelle, James Anthony Cella, Dennis Karlik: Process for the production of polycarbonate. General Electric Company, Oppedahl & Larson, November 25, 2003: US06653434 (24 worldwide citation)

A process for the production of polycarbonate by melt-polycondensing an aromatic dihydroxy compound and diphenylcarbonate, the process comprising adding the to polycarbonate under melt conditions a compound of the formula (1):


7
Hans Peter Brack, James Anthony Cella, Dennis Karlik, Lina Prada: Reduction of reaction by-products in polycarbonate resins. General Electric Company, Oppedahl & Larson, July 8, 2003: US06590068 (23 worldwide citation)

Polycarbonate resin containing reduced levels of reaction by-products can be prepared by adding to the polycarbonate a scavenging agent having the formula:


8
Hans Peter Brack, Daniel Brunelle, James A Cella, Dennis Karlik, Tomoaki Shimoda, Akio Ikeda, Takato Kimura: Process for the production of polycarbonate. General Electric Company, Oppedahl & Larson, February 25, 2003: US06525163 (23 worldwide citation)

Polycarbonate having increased end-cap levels is made by adding an end-capping agent to the polycarbonate, preferably after the polycarbonate has reached a number-average molecular weight of about 2,000 to 15,000 Dalton. The end-capping agent has the formula:


9
John Morgan Whitney, Hans Peter Brack, Theodorus Lambertus Hoeks, Irene Dris, Dennis Karlik: Method for end-capping polycarbonate resins and composition for use in same. General Electric Company, Oppedahl & Larson, March 23, 2004: US06710156 (23 worldwide citation)

A method for end-capping polycarbonate resins, comprising the step of processing a mixture comprising a polycarbonate having free hydroxyl-end groups and an end-capping reagent in a melt transesterification reaction to produce a polycarbonate resin, wherein the end-capping reagent comprises a mixtur ...


10
Theodorus Lambertus Hoeks, Jan Henk Kamps, Dennis Karlik, Edward Kung, Michael Teruki Takemori: Transparent articles prepared from thermoplastic compositions having low birefringence. Sabic Innovative Plastics IP, Cantor Colburn, November 22, 2011: US08064140 (5 worldwide citation)

An optical grade article comprises a thermoplastic composition comprising a poly(aliphatic ester)-polycarbonate copolymer comprising 10 to 25 wt % of a soft block ester unit derived from a C20-44 aliphatic dicarboxylic acid or derivative thereof, 34 to 77 wt % of a carbonate unit derived from 2-hydr ...