Abstract: A thin film transistor includes an active layer located over a substrate, a first gate stack including a stack of a first gate dielectric and a first gate electrode and located on a first surface of the active layer, a pair of first contact electrodes contacting peripheral portions of the first surface of the active layer and laterally spaced from each other along a first horizontal direction by the first gate electrode, a second contact electrode contacting a second surface of the active layer that is vertically spaced from the first surface of the active layer, and a pair of second gate stacks including a respective stack of a second gate dielectric and a second gate electrode and located on a respective peripheral portion of a second surface of the active layer.

Abstract: Processes are provided for producing transition metal amidos and/or imidos. In methods according to this invention, at least one halogenated transition metal, an amine compound and a solvent are combined, followed by the addition of an alkylated metal or a Grignard reagent to produce the transition metal amide and/or imido.

Abstract: Processes are provided for producing transition metal amides. In methods according to this invention, at least a halogenated transition metal and an amine are combined in a solvent to produce an intermediate composition and an alkylated metal or a Grignard reagent is added to the intermediate composition to produce the transition metal amide.

Abstract: Processes are provided for producing transition metal amidos and/or imidos. In methods according to this invention, at least one halogenated transition metal, an amine compound and a solvent are combined, followed by the addition of an alkylated metal or a Grignard reagent to produce the transition metal amide and/or imido.

Abstract: Processes are provided for producing transition metal amides. In methods according to this invention, at least a halogenated transition metal and an amine are combined in a solvent to produce an intermediate composition and an alkylated metal or a Grignard reagent is added to the intermediate composition to produce the transition metal amide.

Abstract: Surprisingly stable olefin polymerization co-catalysts formed from hydroxyaluminoxanes are revealed. In one embodiment of the invention, a solid composition of matter is formed from a hydroxyaluminoxane and a treating agent, whereby the rate of OH-decay for the solid composition is reduced as compared to that of the hydroxyaluminoxane. Processes for converting a hydroxyaluminoxane into a such a solid composition of matter, supported catalysts formed from such solid compositions of matter, as well as methods of their use, are described.

Abstract: Surprisingly stable olefin polymerization catalysts and co-catalysts formed from hydroxyaluminoxanes are revealed. In one embodiment of the invention, a solid composition of matter is formed from a hydroxyaluminoxane and a treating agent, whereby the rate of OH-decay for the solid composition is reduced as compared to that of the hydroxyaluminoxane. Gelatinous compositions of matter formed from hydroxyaluminoxane and having similar stability characteristics are also disclosed. Processes for converting a hydroxyaluminoxane into a such compositions of matter, supported catalysts formed from such co-catalyst compositions of matter, as well as methods of their use, are described.

Abstract: Gelatinous compositions of matter which are useful as polymerization catalyst components and are highly stable in terms of OH-decay rate, as well as similarly stable solid compositions of matter formed from such gelatinous compositions, are described. The gelatinous and solid compositions are formed from hydroxyaluminoxane. Also disclosed is a process comprising converting a hydroxyaluminoxane into a gelatinous composition of matter, whereby the rate of OH-decay for the composition is reduced as compared to that of the hydroxyaluminoxane. Olefin polymerization processes and catalysts formed from these novel compositions of matter also are disclosed.

Abstract: Novel, highly effective catalyst compositions are described in which a low cost co-catalyst can be employed at very low aluminum loadings. Such compounds are composed of a cation derived from d-block or f-block metal compound, such as a metallocene, by loss of a leaving group, and an aluminoxate anion derived by transfer of a proton from a stable or metastable hydroxyaluminoxane to such leaving group. These catalyst compositions have extremely high catalytic activity and typically have high solubility in paraffinic solvents. Moreover they yield reduced levels of ash and result in improved clarity in polymers formed from such catalysts. Surprisingly, when isolated and stored, and optionally purified, under anhydrous inert conditions and surroundings, the catalyst compounds are more stable than if kept in solution. Thus these catalyst compounds can be stored, shipped, and used under inert anhydrous conditions as preformed catalysts thus simplifying the polymerization operations.

Abstract: Gelatinous compositions of matter which are useful as polymerization catalyst components and are highly stable in terms of OH-decay rate, as well as similarly stable solid compositions of matter formed from such gelatinous compositions, are described. The gelatinous and solid compositions are formed from hydroxyaluminoxane. Also disclosed is a process comprising converting a hydroxyaluminoxane into a gelatinous composition of matter, whereby the rate of OH-decay for the composition is reduced as compared to that of the hydroxyaluminoxane. Olefin polymerization processes and catalysts formed from these novel compositions of matter also are disclosed.

Abstract: Novel, highly effective catalyst compositions are described in which a low cost co-catalyst can be employed at very low aluminum loadings. Such compounds are composed of a cation derived from d-block or f-block metal compound, such as a metallocene, by loss of a leaving group, and an aluminoxate anion derived by transfer of a proton from a stable or metastable hydroxyaluminoxane to such leaving group. These catalyst compositions have extremely high catalytic activity and typically have high solubility in paraffinic solvents. Moreover they yield reduced levels of ash and result in improved clarity in polymers formed from such catalysts. Surprisingly, when isolated and stored, and optionally purified, under anhydrous inert conditions and surroundings, the catalyst compounds are more stable than if kept in solution. Thus these catalyst compounds can be stored, shipped, and used under inert anhydrous conditions as preformed catalysts thus simplifying the polymerization operations.

Abstract: Surprisingly stable olefin polymerization co-catalysts formed from hydroxyaluminoxanes are revealed. In one embodiment of the invention, a solid composition of matter is formed from a hydroxyaluminoxane and a treating agent, whereby the rate of OH-decay for the solid composition is reduced as compared to that of the hydroxyaluminoxane. Processes for converting a hydroxyaluminoxane into a such a solid composition of matter, supported catalysts formed from such solid compositions of matter, as well as methods of their use, are described.

Abstract: Novel, highly effective catalyst compositions are described in which a low cost co-catalyst can be employed at very low aluminum loadings. Such compounds are composed of a cation derived from d-block or f-block metal compound, such as a metallocene, by loss of a leaving group, and an aluminoxate anion derived by transfer of a proton from a stable or metastable hydroxyaluminoxane to such leaving group. These catalyst compositions have extremely high catalytic activity and typically have high solubility in paraffinic solvents. Moreover they yield reduced levels of ash and result in improved clarity in polymers formed from such catalysts. Surprisingly, when isolated and stored, and optionally purified, under anhydrous inert conditions and surroundings, the catalyst compounds are more stable than if kept in solution. Thus these catalyst compounds can be stored, shipped, and used under inert anhydrous conditions as preformed catalysts thus simplifying the polymerization operations.

Abstract: Gelatinous compositions of matter which are useful as polymerization catalyst components and are highly stable in terms of OH-decay rate, as well as similarly stable solid compositions of matter formed from such gelatinous compositions, are described. The gelatinous and solid compositions are formed from hydroxyaluminoxane. Also disclosed is a process comprising converting a hydroxyaluminoxane into a gelatinous composition of matter, whereby the rate of OH-decay for the composition is reduced as compared to that of the hydroxyaluminoxane. Olefin polymerization processes and catalysts formed from these novel compositions of matter also are disclosed.

Abstract: Novel, highly effective catalyst compositions are described in which a low cost co-catalyst can be employed at very low aluminum loadings. Such compounds are composed of a cation derived from d-block or f-block metal compound, such as a metallocene, by loss of a leaving group, and an aluminoxate anion derived by transfer of a proton from a stable or metastable hydroxyaluminoxane to such leaving group. These catalyst compositions have extememly high catalytic activity and typically have high solubility in paraffinic solvents. Moreover they yield reduced levels of ash and result in improved clarity in polymers formed from such catalysts.

Abstract: Ethylene is trimerized to form 1-hexene by using a catalyst comprising an aluminoxane and polydentate phosphine, arsine, and/or stibine coordination complex of a chromium salt. Catalysts, complexes, and ligands enabling production of 1-hexene in extremely high yields and purity are also described.

Abstract: Ethylene is trimerized to form 1-hexene by using a catalyst comprising an aluminoxane and polydentate phosphine, arsine, and/or stibine coordination complex of a chromium salt. Catalysts, complexes, and ligands enabling production of 1-hexene in extremely high yields and purity are also described.

Abstract: Alpha-olefins enriched in 1-hexene are prepared by oligomerizing ethylene in the presence of a catalyst comprising (a) a chromium complex containing a coordinating polydentate ligand and, (b) an aluminoxane, in an organic solvent.

Abstract: Ethylene is trimerized to form 1-hexene by using a catalyst comprising an aluminoxane and polydentate phosphine, arsine, and/or stibine coordination complex of a chromium salt.

Abstract: A process for dimerizing an alpha-olefin of the general formula RCH.dbd.CH.sub.2, where R is alkyl, cycloalkyl, or cycloalkenyl with a carbon number ranging from 1 to about 30, to a vinylidene olefin comprises contacting said alpha-olefin at temperatures between about -60.degree. C. to and 280.degree. C. with a catalyst comprising (a) a metallocene having the general formula (cyclopentadienyl).sub.n MY.sub.4-n wherein n=2 or 3, M is titanium, zirconium or hafnium and each Y is individually selected from hydrogen, C.sub.1 -C.sub.5 alkyl, C.sub.6 -C.sub.20 aryl, C.sub.2 -C.sub.20 alkoxy, C.sub.2 -C.sub.20 ester, and halogen, (b) an alkylaluminoxane other than methyl-aluminoxane, and (c) trimethyl aluminum.