Abstract:
A polyolefin which is functional at each end and which is represented by the following general formula (I) and has a molecular-weight distribution (Mw/Mn) as determined by gel permeation chromatography (GPC) of 1.0 to 1.5. It is useful in various applications. X-P-Y (I) (In the formula (I), X and Y may be the same or different and each is a group containing at least one element selected among oxygen, sulfur, nitrogen, phosphorus, and halogens; and P represents a chain consisting mainly of units of an olefin constituted of carbon atoms and hydrogen atoms only, provided that X and Y are bonded respectively to the two ends of P.)
Abstract:
To provide capsular fine particles comprising an olefinic polymer which have a uniform particle size distribution and a uniform particle size, and which are spherical and free from the coagulation between particles. Capsular fine particles comprising the olefinic polymer, of which the ratio (L/M) of the outer diameter (L) to the inner diameter (M) is 1.1 to 6.0, and the average diameter is 0.6 to 40 µm.
Abstract:
The present invention provides an olefin polymer having a narrow molecular weight distribution and a specific molecular weight, an olefin polymer having a functional group introduced at the terminal, a tapered polymer containing a segment wherein monomer composition continuously changes in the polymer chain, an olefin polymer having different segments which are bonded to each other, and a process for preparing these polymers. The olefin polymers of the invention are polymers of olefins of 2 to 20 carbon atoms and have a number-average molecular weight of not less than 500 and Mw/Mn of not more than 1.5. In the process for preparing an olefin polymer, an olefin of 2 to 20 carbon atoms is polymerized in the presence of an olefin polymerization catalyst comprising a transition metal compound represented by, for example, the following formula (I): LmMXn wherein M is a transition metal atom of Group 3 to Group 11 of the periodic table, m is 1 to 5, n is a number satisfying a valence of M, L is a ligand coordinated to the central metal M and is a ligand containing a heteroatom having no direct bond to the central metal, and X is a halogen atom, a hydrocarbon group or the like.
Abstract:
An ethylene copolymer excellent in mechanical properties and moldability, which comprises 40 to 99 mol% ethylene units and 1 to 60 mol% C3-20 α-olefin units and in which the ratio (Mz/Mw) of the Z-average molecular weight (Mz) to the weight-average molecular weight (Mw) both determined by GPC is 10 to 30, that ratio (Mz/Mw) and the ratio (Mw/Mn) of the weight-average molecular weight (Mw) to the number-average molecular weight (Mn) both determined by GPC satisfy the relationship (Mz/Mw)⊃(Mw/Mn), the intrinsic viscosity is 0.5 to 4 dl/g, the ratio of the melt viscosity (θ*0.01) as measured at 190 °C and a shear rate of 0.01 rad/sec to that (θ*8) as measured at 190 °C and a shear rate of 8 rad/sec satisfy the relationship (θ*0.01/θ*8) 0.843x(θ)+1.0, and the absolute value of the activation energy (Ea) with respect to melt viscoelasticity shift factor is 4x104 J/mol.K or lower.
Abstract:
A polyolefin which is functional at one end and which is represented by the following general formula (I) and has a molecular-weight distribution (Mw/Mn) as determined by gel permeation chromatography (GPC) of 1.0 to 1.5. It is useful in various applications. P-X (I) (In the formula (I), X is a group containing at least one element selected among oxygen, sulfur, nitrogen, phosphorus, and halogens; and P represents a polymer chain consisting mainly of units of an olefin constituted of carbon atoms and hydrogen atoms only, provided that X is bonded to an end of P.)
Abstract:
A catalyst for olefin polymerization which comprises a novel transition metal compound and has excellent activity in olefin polymerization; and a method of polymerizing an olefin using this catalyst. The catalyst comprises a transition metal compound (A-1) represented by formula (I) or a transition metal compound (A-2) represented by formula (II) and optionally further contains at least one compound (B) selected from the group consisting of organometallic compounds (B-1), organoaluminumoxy compounds (B-2), and compounds (B-3) which react with the transition metal compound (A-1) or (A-2) to form an ion pair. (In the formulae, M represents a transition metal in Groups 3 to 11 of the Periodic Table; m is an integer of 1 to 3 in formula (I) and is an integer of 1 to 6 in formula (II); Q represents -N= or -C(R2)=; A represents -O-, -S-, -Se-, or -N(R?6)-; R1 to R6¿ each represents hydrogen, a hydrocarbon group, etc., provided that two or more of R1 to R6 may be bonded to each other to form a ring; n is a number equal to the valence of M; and X represents halogeno, a hydrocarbon group, etc.).
Abstract:
Ethylene (co)polymers excellent in moldability, mechanical characteristics and so on and suitable for various moldings, particularly pipes. For example, ethylene homopolymers or ethylene/C4-C20 α-olefin copolymers, wherein the number of methyl branches is less than 0.1 per 1000 carbon atoms as determined by 13C-NMR and the Mw/Mn ratio is 1.8 or above but below 4.5 as determined by GPC; and ethylene homopolymers or ethylene/C¿3?-C20 α-olefin copolymers, wherein the melt tension (MT) and the swelling ratio (SR) satisfy the relationship: log(MT) > 12.9 - 7.15 x SR, and the intrinsic viscosity ([θ]) and the melt flow rate (MFR) satisfy the relationship: [θ] > 1.85 x MFR?-0.192¿ in the case of MFR 1.85 x MFR-0.213 in the case of MFR ≥ 1.
Abstract:
The present invention provides olefin polymerization catalysts which can produce olefin polymers with excellent polymerization activity and an olefin polymerization method using the catalyst, wherein the catalyst comprises a transition metal amide compound represented by general formula (I) below: where M is Ti, etc.; R is alkyl, (substituted) phenyl, etc.; R is -C(R )2C(R )mC(R )2- or -C(R )2-X -C(R )2-(X representing a silicon-containing group, etc., and R and R representing hydrocarbon groups, etc.); and R is a hydrocarbon group or halogen, etc.; and at least one compound selected from among organoaluminum oxy-compounds, ionizing ionic compounds and organometallic compounds. The present invention further provides a process for producing olefin polymers whereby the olefin polymers are produced with even higher polymerization activity, and the resulting polymers have no residual odor, wherein during polymerization or copolymerization of olefins in the presence of a catalyst comprising a transition metal amide compound represented by (R2N)kM X j-k (M representing Ti, Zr, etc., j representing the valency of M , k representing 1 to j, R representing a hydrogen atom, hydrocarbon group, etc., and X representing a halogen, hydrocarbon group, etc.) and an organoaluminum oxy-compound, the organoaluminum oxy-compound is added to the polymerization system in a form of an aliphatic or alicyclic hydrocarbon slurry.