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Inventor:
Brack; Hans-Peter
Address:
Herrliberg, CH
No. of patents:
23
Patents:












Patent Number Title Of Patent Date Issued
8273849 Isosorbide-based polycarbonates, method of making, and articles formed therefrom September 25, 2012
Disclosed herein is a polycarbonate polymer comprising: an isosorbide unit, and an aliphatic unit different from the isosorbide unit, wherein the isosorbide unit and aliphatic unit are each carbonate, or a combination of carbonate and ester units and the aliphatic unit is derived fro
8058469 Method for making carbamates, ureas and isocyanates November 15, 2011
The present invention provides methods of forming carbamates, ureas, and isocyanates. In certain embodiments these methods include the step of reacting an amine with an ester-substituted diaryl carbonate to form an activated carbamate which can be further derivitized to form non-acti
7977447 Method for making carbonates and esters July 12, 2011
A method for forming a monomeric carbonate includes the step of combining a monofunctional alcohol or a difunctional diol with an ester-substituted diaryl carbonate to form a reaction mixture. Similarly, a method for forming a monomeric ester includes the step of combining a monofunction
7863404 Method of making isosorbide polycarbonate January 4, 2011
A polycarbonate is provided that contains repeat units derived from isosorbide and a residue derived from an activated diaryl carbonate. The polycarbonate has .sup.1H-NMR peaks associated with the repeat units derived from isosorbide. The polycarbonate contains no more than a maximum
7858728 Polycarbonate resins method of manufacture, and articles formed therefrom December 28, 2010
Disclosed herein is a polycarbonate comprising a terminal olefin group of the formula ##STR00001## wherein R.sup.1 is a C.sub.1-C.sub.40 hydrocarbon that can be unsubstituted or substituted with a halogen, olefin, ether, ketone, or C.sub.4-C.sub.30 polyoxyalkylene functionality in w
7834125 Polycarbonates, compositions made therefrom, methods of manufacture thereof, and articles theref November 16, 2010
A melt polymerized polycarbonate comprising repeat units in the polycarbonate derived from the melt polymerization of monomers (II) and/or (III), monomer (IV), and optionally monomer (VIII), wherein monomers (II) and (III) are diaryl dihydroxy compounds, monomer (IV) is a sterically
7759456 Branched polycarbonate resins and processes to prepare the same July 20, 2010
A method of increasing the branching and polydispersity of a polycarbonate includes the steps of: (a) including in the polycarbonate at least one species of an alkyl substituted monomer, and (b) treating the polycarbonate at an elevated temperature and for a sufficient time to increa
7674872 Method of producing high molecular weight polymer March 9, 2010
The present invention provides methods of producing high molecular weight polymer. A method of forming polycarbonate includes the step of combining in a reaction mixture a diaryl carbonate, a transesterification catalyst, an aliphatic dihydroxy compound, and a diacid compound in a reacto
7671165 Method of forming polycarbonate March 2, 2010
A method of forming polycarbonate includes the steps of introducing a plurality of reaction components to a reactor operating under melt polymerization conditions and removing ester-substituted phenol from the reactor. The plurality of reaction components include a dihydroxy compound
7671164 Aliphatic polycarbonates, methods of making, and articles formed therefrom March 2, 2010
A method of making a polycarbonate is described. The method comprises melt reacting an ester-substituted diaryl carbonate and a multifunctional compound of the formula: ##STR00001## in the presence of catalyst to form an oligomer comprising less than 2,000 ppm of an ester-linked ter
7645851 Polycarbonate with reduced color January 12, 2010
A method of making polycarbonate includes the steps of forming polycarbonate by a melt transesterification method using an activated diaryl carbonate, and compounding the polycarbonate with a phosphorus-containing compound that has an abstractable proton or hydrolyzable group. The ph
7619053 Monomer solution for producing polycarbonate November 17, 2009
A non-reactive monomer mixture has a monomer component dispersed in a melted diaryl carbonate. The monomer component has one or more monomer compounds having a melting point below the melting point of the diaryl carbonate. Furthermore, the monomer component has less than 600 ppb alka
7615605 Monomer solution for producing polycarbonate November 10, 2009
A non-reactive monomer mixture contains a monomer component and a diaryl carbonate dispersed in the mixture. The monomer component includes one or more monomer compounds having a melting point below the melting point of the diaryl carbonate. The monomer component has less than 600 ppb al
7601794 Monomer solution for producing polycarbonate October 13, 2009
A non-reactive monomer mixture is formed from a dihydroxy component having one or more dihydroxy compounds dissolved in a melted diaryl carbonate. The dihydroxy component has less than 600 ppb alkali metal, an acid stabilizer, or both less than 600 ppb alkali metal and an acid stabil
7547799 Method for producing phenolic compound June 16, 2009
A method is provided for producing an ester-substituted phenol product stream from an ester-substituted diaryl carbonate manufacturing waste stream. The method includes the steps of obtaining a waste stream containing an ester-substituted diaryl carbonate from an ester-substituted di
7547749 Triazine compounds, polymers comprising triazine structural units, and method June 16, 2009
In various embodiments the present invention comprises 2,4,6-trisubstituted-1,3,5-triazine capping agents comprising one, two, or three leaving groups as substituents with any remaining substituents being essentially inert to reaction with a nucleophilic group on a polymer or monomer
7541420 Method for making molded polycarbonate articles with improved color June 2, 2009
A method for preparing a molded article includes the steps of (a) obtaining a polycarbonate resin and (b) molding the polycarbonate resin. The polycarbonate resin is made by a transesterification reaction using an activated diaryl carbonate such that the polycarbonate is susceptible
7365149 Equipment cleaning in the manufacture of polycarbonates April 29, 2008
A surface of a melt polymerization reactor system having residual reaction components of a melt polymerization reaction thereon can be cleaned by introducing a cleaning agent having a phenolic compound to the polymerization reactor system and into contact with the surface of the melt
7105626 Method for incorporating alkyl ester endgroups to improve the release properties of melt polycar September 12, 2006
Alkyl ester end-capped polycarbonates have improved release properties and may be produced by a method comprising the step of combining a polycarbonate having free terminal OH groups with an end-capping reagent comprising a symmetrical activated carbonate and an alkyl ester, whereby
6747119 Method and system for preparing a polycarbonate, copolymerization reagent and polycarbonate June 8, 2004
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 hi
6734277 Method of enhancing pit replication in optical disks May 11, 2004
Polycarbonate compositions incorporating long chain alkylphenol endgroups, for example cardanol, show enhanced pit replication characteristics when molded into optical disks. The enhancement in molding performance is especially pronounced at the shortest mold cycle times tested. Thus, a
6710156 Method for end-capping polycarbonate resins and composition for use in same March 23, 2004
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 co
6620902 Process for preparing polycarbonate and apparatus for preparing polycarbonate September 16, 2003
A process for preparing an end-capped polycarbonate comprises melt reacting an aromatic dihydroxy compound, a carbonic acid diester, and optionally a catalyst in a prepolymerization vessel to form a polycarbonate product; transferring the polycarbonate product from the prepolymerization










 
 
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