Abstract:
The invention provides a process, and transition metal complex, to form an ethylene-based polymer, said process comprising polymerizing ethylene, and optionally at least one comonomer, in the presence of at least one molecular transition metal complex selected from Formula 1, as described herein.
Abstract:
Embodiments of this disclosure include processes of polymerizing olefins, the process comprising contacting ethylene and a (C 3 -C 40 )alpha-olefin comonomer in the presence of a catalyst system, the catalyst system comprising a Group IV metal-ligand complex and an ionic metallic activator complex, the ionic metallic activator complex comprising an anion and a countercation, the anion having a structure according to formula (I):formula (I)
Abstract:
Polyurethanes are made by curing a reaction mixture containing a polyether polyol that contains residues of a zinc hexacyanocobaltate catalyst complex. The reaction mixture contains certain chelating agents in small quantities. The amount of cobalt that is extractable from the polyurethane is reduced.
Abstract:
Processes of polymerizing olefins. The process includes polymerizing contacting ethylene and a (C3-C40)alpha-olefin comonomer in the presence of a catalyst system comprising a procatalyst and a bimetallic activator complex. The bimetallic activator complex includes an anion and a countercation. The anion having a structure according to formula (I).
Abstract:
Embodiments of the disclosure include processes of polymerizing olefins. The process includes contacting ethylene and a (C 3 −C 40 )alpha-olefin comonomer in the presences of a catalyst system. The catalyst system comprises a procatalyst and a bimetallic activator complex. The bimetallic activator complex comprises an anion and a countercation, and the anion has a structure according to formula (I).
Abstract:
An adhesive formulation including: (a) at least one polyol having an average functionality number of greater than 3 and a hydroxyl equivalent weight of from about 300 g/mol OH to about 3,000 g/mol OH; and (b) at least one tin catalyst compound; wherein the adhesive formulation exhibits a latency of greater than 10 minutes open time; and a process for preparing the adhesive formulation.
Abstract:
Embodiments relate to a coating, adhesive, sealant, elastomer, or reaction injection molded material forming polyurethane composition that comprises an isocyanate component that includes at least one isocyanate-terminated prepolymer, and an isocyanate reactive component that includes at least one Lewis acid catalyst polymerized polyether polyol having a weight average molecular weight from 200 g/mol to 1,000 g/mol, an average primary hydroxyl group content of at least 30 %, and an average acetal content of at least 0.05 wt%.
Abstract:
Polyethers are prepared by polymerizing an alkylene oxide in the presence of a starter, an aluminum compound that has at least one hydrocarbyl substituent, and a phosphorus-nitrogen base. The phosphorus-nitrogen base is present in only a small molar ratio relative to the amount of starter. The presence of such small amounts of phosphorus-nitrogen base greatly increases the catalytic activity of the system, compared to the case in which the aluminum compound is used by itself. The product polyethers have low amounts of unsaturated polyether impurities and little or no unwanted high molecular weight fraction. Polymers of propylene oxide have very low proportions of primary hydroxyl groups.
Abstract:
Polyethers are prepared by polymerizing an alkylene oxide in the presence of a starter, an aluminum compound that has at least one hydrocarbyl substituent, and a cyclic amidine. The phosphorus-nitrogen base is present in only a small molar ratio relative to the amount of starter. The presence of such small amounts of cyclic amidine greatly increases the catalytic activity of the system, compared to the case in which the aluminum compound is used by itself. The product polyethers have low amounts of unsaturated polyether impurities and little or no unwanted high molecular weight fraction. Polymers of propylene oxide have very low proportions of primary hydroxyl groups.