Abstract:
Methods and compositions for controlling polymer crosslinking are provided. The crosslinking composition includes a crosslinkable polymer, a free radical initiator, and an amine. The amine is an alkoxyaminc or a hydroxylamine. The crosslinking composition is heated to a processing temperature. The amine undergoes a cleavage reaction at or below the processor temperature to produce nitroxyl radicals in situ . The tree radical initiator forms polymer radicals at the processing temperature. The nitroxyl radicals formed in situ cap the polymer radicals to control crosslinking.
Abstract:
A polymeric film comprising an alkylene oxide homo-or copolymer, wherein the film comprises a coherent pattern of cross-linked alkylene oxide homo-or copolymer and areas of non-crosslinked alkylene oxide homo-or copolymer, is useful as an adhesive film or for preparing an adhesive film.
Abstract:
A Ziegler-Natta procatalyst composition in the form of solid particles and comprising magnesium, halide and transition metal moieties, said particles having an average size (D50) of from 10 to 70 µm, characterized in that at least 5 percent of the particles have internal void volume substantially or fully enclosed by a monolithic surface layer (shell), said layer being characterized by an average shell thickness/ particle size ratio (Thickness Ratio) determined by SEM techniques for particles having particle size greater than 30 µm of greater than 0.2.
Abstract:
A method for enhancing the toughness, e.g., resistance to cracking upon flexing, of coatings made from cycloaliphatic epoxy resins wherein the cycloaliphatic epoxy resin is a cycloaliphatic epoxide ester of a hydroxy-functional compound containing at least one cycloaliphatic ring.
Abstract:
A process for controlling a continuous gas phase exothermic process in a reactor comprising: (i) effecting a gas phase exothermic reaction under a set of operating conditions in the presence of a cooling agent, the cooling agent having a pre-selected concentration and feed rate of an induced cooling agent; (ii) determining a maximum production rate (I) without regard to limitations due to the cooling agent under the operating conditions; (iii) determining a maximum production rate (II) with regard to limitations due to the cooling agent under the operating conditions; (iv) calculating an optimal concentration of the induced cooling agent such that the difference between (I) and (II) is minimized; and (v) adjusting the feed rate of the induced cooling agent to achieve the concentration value calculated in (iv).
Abstract:
A novel bis-chelating composition characterized by formula I: wherein M is a Group VB element; RI and R2 are each independently selected from hydrogen and monovalent hydrocarbyl radicals; or R1 and R2 are bonded together to form a diradical; or one of RI or R2 is hydrogen or a monovalent hydrocarbyl radical, while the other of R1 or R2 is a hydrocarbyl radical bonded to an atom in Ar; wherein Ar is selected from 1,2-arylenes; Q is selected from 1,2-arylenes, 2,2'-bisarylenes and alkyl diradicals; and W is selected from II, III, IV, or V: wherein M is as defined hereinbefore; each R is independently selected from hydrogen and monovalent hydrocarbyl radicals; X is selected from alkyl and aryl diradicals; Ar 1 and Ar 2 are each independently selected from 1,2-arylenes; Ar 3 and Ar 4 are each independently selected from monovalent aryl radicals; and n in formula IV is 0 or 1. The composition finds utility as a ligand in catalysts for carbonylation processes.
Abstract translation:特征在于式I的新型双螯合组合物:其中M是VB族元素; R 1和R 2各自独立地选自氢和一价烃基; 或者R 1和R 2结合在一起形成双基; 或R 1或R 2中的一个为氢或一价烃基,而R 1或R 2中的另一个为与Ar中的原子键合的烃基; 其中Ar选自1,2-亚芳基; Q选自1,2-亚芳基,2,2'-双芳烯和烷基双基; W选自II,III,IV或V:其中M如上所定义; 每个R独立地选自氢和一价烃基; X选自烷基和芳基双基; Ar 1和Ar 2各自独立地选自1,2-亚芳基; Ar 3和Ar 4各自独立地选自单价芳基; 式IV中的n为0或1.该组合物用作用于羰基化方法的催化剂中的配体。
Abstract:
A solid, particulated, heterogeneous, spray-dried, catalyst composition for the polymerization of addition polymerizable monomers comprising: a) a Group 4 metallocene compound; b) a solid Group 4 metal-magnesium halide complex comprising moieties of at least magnesium, a Group 4 transition metal, and a halide; c) finely divided, inert filler, and d) an optional binder capable of joining components a) and b) and optionally c) into a particulated, heterogeneous, agglomerate without adversely affecting the catalytic properties thereof, and a method for the manufacture thereof comprising forming a mixture of the above composition in a liquid diluent and spray-drying the same to remove diluent.
Abstract:
A fluidized bed olefin polymerization process is operated in the turbulent regime while utilizing greater than (17.5) percent liquid in the recycle fluid to remove the heat of reaction. The ratio of fluidized bed density to settled bed density may, contrary to prior art predelictions, be maintained at lower than (0.59).
Abstract:
A conducting polymer composite comprising: (i) a phase I material consisting essentially of a polymer copolymer of ethylene and an unsaturated ester having 4 to 20 carbon atoms, said copolymer having a crystallinity of 0 to about 30 percent as determined by differential scanning calorimetry analysis and having a melt viscosity η I ; (ii) a phase II material having a crystallinity of 0 to about 30 percent as determined by differential scanning calorimetry analysis and having a melt viscosity of η II , said phase II material consisting essentially of (A) a non-polar copolymer of ethylene, an alpha-olefin having 3 to 12 carbon atoms, and, optionally, a diene, or (B) a non-polar elastomer, either of which, when mixed with phase I material, will not enter into a completely homogeneous state, but is compatible with the phase I material; and (iii) a conducting filler material dispersed in the phase I material and/or the phase II in an amount sufficient to be equal to or greater than the amount required to generate a continuous conducting network in the phase I and phase II materials, with the proviso that the phase I and phase II materials, in the molten state, have the following relationship: (η I ÷η II )x(V II ÷V I )=0.5 to 2.0 wherein V I and V II are the volume fractions of the phase I and phase II materials, respectively, and V I +V II =1.
Abstract:
This invention relates to a process for separating one or more products from a reaction product fluid comprising a metal-organophosphorus ligand complex catalyst, optionally free organophosphorus ligand, said one or more products, one or more nonpolar reaction solvents and one or more polar reaction solvents, in which said reaction product fluid exhibits phase behavior depicted by Fig. 1, wherein said process comprises (1) supplying said reaction product fluid from a reaction zone to a separation zone, (2) controlling concentration of said one or more nonpolar reaction solvents and said one or more polar reaction solvents, temperature and pressure in said separation zone sufficient to obtain by phase separation two immiscible liquid phases depicted by regions 2, 4 and 6 of Fig. 1 comprising a polar phase and a nonpolar phase and to prevent or minimize formation of three immiscible liquid phases depicted by region 5 of Fig. 1 and one homogeneous liquid phase depicted by regions 1, 3 and 7 of Fig. 1, and (3) recovering said polar phase from said nonpolar phase or said nonpolar phase from said polar phase.