摘要:
A living carbocationic catalyst composition comprising an initiator of a tertiary alkyl halide, a tertiary aralkyl halide or polymeric halide a co-initiator of a methylaluminum or methylboron compound, and a solvent medium with a dielectric constant between 2.5 and 7 is used to produce narrow molecular weight distribution polymers particularly isobutylene polymers.
摘要:
This invention relates to functionalized polymers and a method to obtain them comprising combining a living polymer or a polymer having a terminal halide with an alkylsilylpseudohalide.
摘要:
A living carbocationic catalyst composition comprising an initiator of a tertiary alkyl halide, a tertiary aralkyl halide or polymeric halide, a co-initiator of an alkyl aluminum or alkyl boron, a proton scavenger and a solvent medium with a dielectric constant between 2.5 and 3.25 is used to produce narrow molecular weight distribution polymers particularly isobutylene polymers.
摘要:
A living carbocationic catalyst composition comprising an initiator of a tertiary alkyl halide, a tertiary aralkyl halide or polymeric halide a co-initiator of a methylaluminum or methylboron compound, and a solvent medium with a dielectric constant between 2.5 and 7 is used to produce narrow molecular weight distribution polymers particularly isobutylene polymers.
摘要:
The invention encompasses a mixed transition metal olefin polymerization catalyst system suitable for the polymerization of olefin monomers comprising one late transition metal catalyst system and at least one different catalyst system selected from the group consisting of late transition metal catalyst systems, transition metal metallocene catalyst systems or Ziegler-Natta catalyst systems. Preferred embodiments include at least one late transition metal catalyst system comprising a Group 9, 10, or 11 metal complex stabilized by a bidentate ligand structure and at least one transition metal metallocene catalyst system comprising a Group 4 metal complex stabilized by at least one ancillary cyclopentadienyl ligand. The polymerization process for olefin monomers comprises contacting one or more olefins with these catalyst systems under polymerization conditions.
摘要:
This invention relates to functionalized polymers and a method to obtain them comprising combining a living polymer or a polymer having a terminal halide group with an silyl enol ether.
摘要:
A cationic catalyst composition comprising a reactive cation and a compatible non-coordinating anion is preferably used at a temperature of 20 °C or less to produce olefin polymers, particularly polymers and copolymers of isobutylene.
摘要:
A process for preparing substantially random olefin copolymers containing geminally disubstituted olefin monomers is described. The geminally disubstituted olefin monomers can be represented by the generic formula R1 = R2(R3)(R4), where R1 is CH2, R2 is C, and R3 and R4 are, independently, essentially linear hydrocarbyl groups having from 1 to 30 carbon atoms, or more, and containing one carbon atom bound directly to R2. The copolymers can be prepared by contacting at least one geminally disubstituted olefin monomer and one or more comonomers selected from the group consisting of ethylene and C3-C20 α-olefins, optionally with one or more other coordination polymerizable monomers, with an active coordination catalyst system comprising a bridged bis(arylamido) Group 4 catalyst component.
摘要:
Substantially random ethylene copolymers containing at least 3.0 mole percent of geminally disubstituted olefin monomers are described. The geminally disubstituted olefin monomers can be represented by the generic formula R1 = R2(R3)(R4), where R1 is CH2, R2 is C, and R3 and R4 are, independently, essentially linear hydrocarbyl groups having from 1 to 30 carbon atoms, or more, and containing one carbon atom bound directly to R2. The copolymers can be prepared by coordination polymerization by means of contacting at least one geminally disubstituted olefin monomer and ethylene, optionally with one or more other coordination polymerizable monomers, with a catalyst system comprising a monocyclopentadienyl, heteroatom-containing Group 4 transition metal catalyst component.