Abstract: Provided is a process of polymerization wherein the catalyst comprises: A) a catalyst component consisting essentially of titanium, magnesium, halogen, a polycarboxylic ester, and an organic phosphorus compound; B) electron donor described by the formula:  wherein R1 is alkyl or cycloakylgroup containing at least one secondary or tertiary carbon atom, R2 and R3 are each independently alkyl or aryl group, and R4 is an alkyl group having a primary carbon bonded to the silicon atom; and C) organic aluminum compound.

Abstract: Provided is polyolefin composition, the majority of which is highly isotactic polypropylene, comprising the property of heat of melting (&Dgr;Hm) greater than or equal to about 89 J/g.

Abstract: Provided is method of synthesizing stereorigid metallocene having chiral center and enriching its rac isomer content; comprising steps of:a) selecting desired cyclopentadienyl ring-containing compound capable of forming metallocene with chiral center and dissolving compound in suitable solvent;b) contacting mixture of a), under suitable conditions of mixing and temperature for sufficient time to react, with suitable alkyl alkali metal compound;c) dissolving solid created in b) with sufficient suitable solvent;d) contacting solution created in c) with suitable halogenated compound with which bridge between two cyclopentadienyl ring-containing compounds may be formed, under suitable conditions of mixing and temperature for sufficient time to react;e) removing solvent, and, optionally, removing residual starting cyclopentadienyl ring-containing compound;f) dissolving solid created in e) in suitable solvent and contacting with suitable alkyl alkali metal compound under suitable conditions of temperature and mixin

Abstract: Fiber with unique elastic properties comprising copolymer, of ethylene and comonomer, having density in the range of about 0.86 to about 0.93 g/cm.sup.3, MWD in the range of about 2 to about 3.5, melt index in the range of about 4 to about 1000, and SDBI less than about 25.degree. C.

Abstract: Certain bridged and unbridged amido transition metal compounds of the Group IV-B metals are disclosed. These compounds may be used in a catalyst system comprising the amido transition metal compound and an alumoxane. Also disclosed is a process using the catalyst system for the production of high molecular weight polyolefins and, particularly, high molecular weight isotactic polypropylene.

Abstract: The invention is a supported catalyst system including an inert support material, a Group IV B transition metal component and an alumoxane component which may be employed to polymerize olefins to produce a high molecular weight polymer.

Abstract: The invention is a catalyst system including a Group IV B transition metal component and an alumoxane component which may be employed to polymerize olefins to produce a high molecular weight polymer.

Abstract: Thermite coatings are applied to molten metal filters and the environs, to produce longer lived filters that can be utilized in harsher environments. The coatings employ exothermic, redox, and combination reactions to produce the beneficial effects.