Abstract:
A polymer characterized by having a melt tension (MT (g)) substantially equal to or lower than that of a polymer which is substantially equal in repeating units of the backbone and in molecular weight, molecular-weight distribution, and crystallinity and by having a flow activation energy (Ea (KJ/mol)) higher by at least 5 KJ/mol than the Ea value of that polymer. A preferred example of the polymer is one which comprises 50 to 100 mol% repeating units derived from ethylene and 0 to 50 mol% repeating units derived from an a-olefin having 3 to 20 carbon atoms, satisfies a specific relationship between flow activation energy (Ea (KJ/mol)) and a-olefin content (C (wt.%)), and satisfies a specific relationship between melt tension (MT (g)) and melt flow rate (MFR (g/10 min)). This branched polyolefin is excellent in moldability and mechanical strength.
Abstract:
Olefin block copolymers excellent in affinity with metal, polar resins or the like, impact resistance, mar resistance, thermal resistance, rigidity, oil resistance, transparency, antifogging properties, electrical insulation properties, breakdown voltage, application properties, low-temperature flexibility, moldability, environmental degradation properties, fluidity and/or dispersion properties; and processes for producing the block copolymers. The block copolymers are represented by the general formula (I): PO?1 - g1- B1¿ (wherein PO1 is a segment composed of repeating units derived from C¿2-20? olefin; g?1¿ is an ester, ether, amide, imide, urethane, urea, silyl ether, or carbonyl linkage; and B1 is an unsaturated hydrocarbon or heteroatom-containing segment).
Abstract:
A branched polyolefin having various excellent properties; a process for producing the branched polyolefin; and a thermoplastic resin composition containing the branched polyolefin. The branched polyolefin is made up of olefin chains (A) and olefin chains (B) which each comprises repeating units derived from an olefin as the main structural units, the chains (B) being bonded to the chains (A) at sites other than the ends of the chains (A) through bonds each having a carbonyl group and the number of the chains (B) being 1 or larger per chain (A). The process for producing a branched polyolefin comprises reacting a functional polyolefin (C) having a carboxyl and/or acid anhydride group bonded to each end thereof and further having one or more carboxyl and/or acid anhydride groups bonded to other sites with a terminal-modified polyolefin (D) having only at an end thereof a group reactive with a carboxyl or acid anhydride group.
Abstract:
It is an object to provide a new polyolefin hybrid polymer composed of a polyolefin segment and a polar polymer segment (Z) and a method for manufacturing the hybrid polymer by an industrially advantageous procedure. A polyolefin hybrid polymer composed of a polyolefin segment and a polar polymer segment (Z), wherein the polyolefin hybrid polymer is a modified compound of maleic polyolefin (A), is characterized by comprising a constitutional unit represented by the general formula (I): wherein Z represents a polar polymer segment obtained by polymerizing monomers of at least one kind selected from organic compounds having at least one carbon-carbon unsaturated bond, and F represents a group including an unsaturated bond.
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:
Provided is a new adhesive polyolefin resin composition, containing 1 to 100 % by weight of a high polymer structure, that has good heat resistance and excellent adhesion performance to polyolefins and various polar materials, wherein a polyolefin segment (A) is bonded with an addition polymer segment (B) of a non-olefinic vinyl monomer and a reactive group is introduced into the addition polymer segment (B) and an adhesive or dispersion obtained therefrom.
Abstract:
[PROBLEMS] To provide a novel hybrid polymer which has a structure wherein a polyolefin segment and a polar polymer segment are connected not via a bonding group containing a hetero atom; and a method for producing the above hybrid polymer in an industrially advantageous manner. [MEANS FOR SOLVING PROBLEMS] A hybrid polymer which comprises a polyolefin segment (A) and a polar polymer segment (B) prepared by the radical polymerization of a radically polymerizable monomer.
Abstract:
Disclosed is a novel olefin polymer exhibiting excellent heat resistance while having an excellent balance among various physical properties. Such an olefin polymer contains 50-100 weight% of a constitutional unit derived from 4-methyl-1-pentene and 0-50 weight% of another constitutional unit derived from at least one olefin selected from olefins other than 4-methyl-1-pentene which have 2-20 carbon atoms. The olefin polymer is characterized in that (i) the isotactic diad tacticity is not less than 70%; (ii) the ratio (Mw/Mn) between the weight average molecular weight (Mw) and the number average molecular weight (Mn) determined by gel permeation chromatography (GPC) is 1.0-3.5; and (iii) the limiting viscosity [η] is not less than 0.5 (dl/g).
Abstract:
The invention provides a propylene/1-butene random copolymer excellent in flexibility, impact resistance, heat resistance, and low-temperature heat sealability; a polypropylene composition containing the copolymer; sheet made from the composition; and composite films each comprising a (stretched) film and a layer made from the above composition. The copolymer comprises 60 to 90 mole % of propylene units and 10 to 40 mole % of 1-butene units and has a triad isotacticity of 85 to 97.5 %, a molecular weight distribution (Mw/Mn) of 1 to 3, a limiting viscosity of 0.1 to 12dl/g, and a melting point (Tm) of 40 to 120°C, Tm and 1-butene unit content (M mole %) satisfying the relationship: 146exp(-0.022M) > Tm > 125exp(-0.032M) The invention also provides transition metal compounds useful as the catalyst component for olefin polymerization, and catalysts for olefin polymerization containing the transition metal compounds.