摘要:
Disclosed herein are processes for polymerizing ethylene, acyclic olefins, and/or selected cyclic olefins, and optionally selected olefinic esters or carboxylic acids, and other monomers. The polymerizations are catalysed by selected transition metal compounds, and sometimes other co-catalysts. Since some of the polymerizations exhibit some characteristics of living polymerizations, block copolymers can be readily made. Many of the polymers produced are often novel, particularly in regard to their microstructure, which gives some of them unusual properties. Numerous novel catalysts are disclosed, as well as some novel processes for making them. The polymers made are useful as elastomers, molding resins, in adhesives, etc. Also described herein is the synthesis of linear α-olefins by the oligomerization of ethylene using as a catalyst system a combination of a nickel compound having a selected α-diimine ligand and a selected Lewis or Bronsted acid, or by contacting selected $(a)-diimine nickel complexes with ethylene.
摘要:
A lubricant component is an oligomer of a series α-olefins, made by forming a series of α-olefins by oligomerization of ethylene using an ethylene oligomerization catalyst, and then oligomerizing the series of α-olefins using a Lewis acid catalyst. The α-olefin oligomer, which often has a high Viscosity Index, may be used for example in a lubricant as the base oil or a viscosity index modifier. The α-olefin oligomer may also be a component of a lubricant additive, meant to be added to an already formulated lubricant to improve the lubricant's properties.
摘要:
Selected olefins such as ethylene and α-olefins are polymerized by nickel [II] complexes of certain monoanionic ligands. The polyolefins are useful in many applications such as molding resins, film, fibers and others. Also described are many novel nickel compounds and their precursors, as well as novel ligands.
摘要:
A paste composition contains an electrically conductive silver powder, one or more glass frits or fluxes, and a lithium compound dispersed in an organic medium. The paste is useful in forming an electrical contact on the front side of a solar cell device having an insulating layer. The lithium compound aids in establishing a low-resistance electrical contact between the front-side metallization and underlying semiconductor substrate during firing.
摘要:
The present invention concerns siloxane derivatives of polyetheralcohols used as nonvolatile in situ precursors to anti-fog agents for packaging films and a novel process of making such films.
摘要:
This invention relates to a method by which olefinically-unsaturated organic molecules, which are otherwise nonpolymerizable, may be homopolymerized or copolymerized with conventional monomers through the use of cobalt chain transfer catalysts. The resulting macromonomers contain one terminal functional group and a terminal double bond on the other end of the chain.
摘要:
Processes for forming adducts of amines with acrylic macromonomers are provided. Also provided are processes for using ring-closing reactions of the adducts to form lactams. The adducts are useful, for example, for making adhesives, surfactants, viscosity modifiers, processing aids, and other products.