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| Number | Title | Issue Date |
| 8034967 | Method of preparing a purified ester-substituted phenol stream A method of producing a purified ester-substituted phenol stream is provided. The method includes a first step of obtaining from a melt transesterification reaction a byproduct stream containing a residual ester-substituted diaryl carbonate, an ester-substituted phe... | 10/11/2011 |
| 7619053 | Monomer solution for producing polycarbonate 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... | 11/17/2009 |
| 7601794 | Monomer solution for producing polycarbonate 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 ... | 10/13/2009 |
| 6860972 | Process for detecting the location of a phase interface Disclosed herein are processes for detecting the location of an interface between phases. In one embodiment, the process comprises: introducing a reaction mixture into a vessel wherein the reaction mixture is the product of an at least two phase interfacial reaction... | 03/01/2005 |
| 6635788 | Process for manufacture of bisphenols A method for the manufacture of bisphenols comprises introducing a combined feed stream comprising a feed stream and a recycle stream into a reactor system comprising at least one reactor containing a catalytic proportion of an acid catalyst and wherein t... | 10/21/2003 |
| 6420517 | Process for resin phase separation by plate decantation This invention relates to an economical and efficient process for purifying a reaction mixture obtained in a two-phase interfacial reaction for the preparation of polycarbonate. More particularly, the method of the invention provides for separating the re... | 07/16/2002 |
| 5723689 | Process for recovering bisphenols A method for recovering substantially pure p,p-bisarylols from a mixture comprising the same by subjecting the mixture to vacuum distillation and melt crystallization in the absence of an adduct crystallization and the generation of a reaction recycle str... | 03/03/1998 |
