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Encyclopedia > Olefin

A synonym for the more widely accepted term, alkene. Alkenes are hydrocarbons that simply have a double bond between at least two carbon atoms. The least complex alkene is ethene (containing two carbon atoms) followed by propene (two carbons), butene (four carbons), and so on. In the cases of butene and larger alkenes, multiple isomers exist depending on the position of the double bond. Alkenes serve as a feedstock for the petrochemical industry. An alkene is an unsaturated hydrocarbon containing at least one carbon-carbon double bond. ... In chemistry, a hydrocarbon is a cleaning solution consisting only of carbon (C) and hydrogen (H). ... Ethylene or ethene is the simplest alkene hydrocarbon, consisting of two carbon atoms and four hydrogens. ... General Name, Symbol, Number carbon, C, 6 Chemical series nonmetals Group, Period, Block 14, 2, p Appearance black (graphite) colorless (diamond) Atomic mass 12. ... Propylene, also known as propene, is a colorless flammable gas with chemical formula C3H6 having a garlic odor. ... Butylene, also known as butene, is the name of the three isomeric hydrocarbon gases with chemical formula C4H8. ...


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  Results from FactBites:
 
Sulfurized olefin process - Patent 4563302 (3383 words)
A sulfurized olefin of claim 10 wherein said monoolefin is a branched chain monoolefin having 4-6 carbon atoms.
4,204,969, an effective sulfurized olefin is made by reacting sulfur monochloride with an olefin in the presence of a lower alkanol promoter to obtain an adduct which is reacted with sodium sulfide and sulfur in aqueous alkanol.
According to the present invention, a sulfurized olefin having improved solubility especially in.alpha.-olefin oligomer lubricating oil is made by reacting a monoolefin with S.sub.2 Cl.sub.2 or SCl.sub.2 to obtain an adduct which is reacted with sodium sulfide, sulfur, alkyl mercaptan and optionally sodium hydrosulfide in an aqueous alcohol reaction medium.
Olefin block copolymer, viscosity index improver for lubricating oils and lubricating oil composition - Patent 7022766 (7352 words)
The polymer block (iii) may be composed of a polymer of ethylene and one olefin selected from α-olefins having 3 to 20 carbon atoms, or be composed of a random copolymer of ethylene and at least two olefins selected from α-olefins having 3 to 20 carbon atoms.
The olefin block copolymer of the invention is a block copolymer comprising a polymer block that is composed of an ethylene/α-olefin copolymer having a relatively low ethylene content and a polymer block that is composed of an ethylene/α-olefin copolymer having a relatively high ethylene content.
The olefin block copolymer of the invention, as is described later, is obtained by first copolymerizing ethylene and an α-olefin to prepare a polymer block, and copolymerizing ethylene and an α-olefin in the presence of the polymer block to prepare a polymer block that is different from the above polymer block.
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