Abstract: Poly(aryletherketone)s comprising fluoride end groups having improved melt stability, lower gel content and lower color are provided.

Abstract: A polymer comprising sulfone groups, ketone groups and optionally substituted polyarylene groups, wherein the number of moles of sulfone groups over the number of moles of ketone groups ratio is greater than 1. A process for making such polymer, a composition comprising such polymer, and articles made therefrom.

Abstract: The presence of certain impurities in diphenyl sulfone have a deleterious effect on the properties of the poly(aryletherketone)s produced therein, including one or more of color, melt stability, molecular weight, crystallinity, etc. and here identify those impurities and provide processes for the removal of such impurities.

Abstract: A process for the preparation of dihalodiphenylsulfones_such as 4,4?-dichlorodiphenyl sulfone or 4,4?-bis-(4-chlorophenylsulfonyl)biphenyl with high regioselectivity, at low temperature and in the absence of toxic reagents by reacting together at least one acid, at least one fluorinated anhydride and at least one halobenzene. The invented process is particularly suited for the manufacture of 4,4?-dichlorodiphenyl sulfone.

Abstract: Improved poly(aryletherketone)s with superior melt stability, lower gel content and lower color and a new process for their manufacture.

Abstract: Improved poly(aryletherketone)s with superior melt stability, lower gel content and lower color and a new process for their manufacture.

Abstract: The present invention describes a process for preparing a poly(aryl ether ketone) by reacting a nucleophile with 4,4?-difluorobenzophenone (4,4?-DFBP) that is improved through the use of 4,4?-DFBP that meets one or more particular purity conditions. Also described are improved poly(aryl ether ketone) produced using the invention 4,4?-DFBP. Amounts of 2,4?-difluorobenzophenone (2,4?-DFBP), 4-monofluorobenzophenone (4-FBP), chlorine, and monochloromonofluorobenzophenone in 4,4?-DFBP are discussed.

Abstract: Sodium carbonate (Na2CO3) having a certain particle size distribution and its use in preparing poly(aryl ether ketone)s, especially PEEK. Poly(aryl ether ketone)s made using the described sodium carbonate. A method for providing a sodium carbonate having a certain particle size distribution, which is especially well suited for the preparation of poly(aryl ether ketone)s.

Abstract: The presence of certain impurities in diphenyl sulfone have a deleterious effect on the properties of the poly(aryletherketone)s produced therein, including one or more of color, melt stability, molecular weight, crystallinity, etc. and here identify those impurities and provide processes for the removal of such impurities.

Abstract: A polymer comprising sulfone groups, ketone groups and optionally substituted polyarylene groups, wherein the number of moles of sulfone groups over the number of moles of ketone groups ratio is greater than 1. A process for making such polymer, a composition comprising such polymer, and articles made therefrom.

Abstract: Process for the desulphurization of a mixture of hydrocarbons comprising sulphur compounds, comprising a stage of oxidation by means of an oxidizing agent, in order to oxidize the sulphur compounds, followed by a stage of removal of the oxidized sulphur compounds by adsorption on an adsorbent solid, in which the adsorbent solid comprises at least 60% by weight of amorphous silica/alumina.

Abstract: Process for the desulphurization of a mixture of hydrocarbons containing sulphur compounds, comprising a step of oxidation by means of hydrogen peroxide, acetic acid and an acid catalyst in order to oxidize the sulphur compounds, in which the acid catalyst contains an acid solid chosen from cation-exchange resins having a pKa of less than or equal to 4, from solids based on silicon oxide additionally containing a trivalent metal, and from particles of inorganic solid on which acidic organic groups are grafted such that the particles thus grafted have a pKa of less than or equal to 4.