Abstract:
L'invention concerne un composé diorganomagnésien de formule RB-Mg-RA, RA étant différent de RB, RA étant une chaîne polymère contenant des unités d'un monomère choisi dans le groupe des monomères constitué par les 1,3-diènes, les α-monoléfines aromatiques et leurs mélanges, RB comprenant un noyau benzénique substitué par l'atome de magnésium, l'un des atomes de carbone du noyau benzénique en ortho du magnésium étant substitué par un méthyle, un éthyle, un isopropyle ou formant un cycle avec l'atome de carbone qui est son plus proche voisin et qui est en méta du magnésium, l'autre atome de carbone du noyau benzénique en ortho du magnésium étant substitué par un méthyle, un éthyle ou un isopropyle, à la condition que si l'un des 2 atomes de carbone en ortho est substitué par un isopropyle, le deuxième atome de carbone en ortho n'est pas substitué par un isopropyle.
Abstract:
The present invention relates to a block copolymer comprising at least one PA block and at least one PB block. The PA block represents a polymer block comprising one or more units of monomer A, and the PB block represents a polymer block comprising one or more units of monomer B. Monomer A is a vinyl, acrylic, diolefin, nitrile, dinitrile, or acrylonitrile monomer. Monomer B is a radically polymerizable plant oil monomer containing one or more triglycerides. The present invention also relates to a method of preparing a thermoplastic block copolymer by radical polymerizing a radically polymerizable monomer with a radically polymerizable plant oil monomer containing one or more triglycerides, in the presence of an initiator and a transition-metal catalyst system to form the thermoplastic block copolymer. The polymerized plant oil-based block copolymers are useful in a variety of applications, such as asphalt modifiers, rubber compositions, adhesives, tires, in the automobile industry, footwear, packaging, etc.
Abstract:
A catalyst is prepared in situ by reaction between an aryl halide and a Ni(0) complex. The catalyst may be used to promote chain-growth polymerization of halogen- substituted Mg or Zn monomers by a controlled radical mechanism. Polymers, copolymers, block copolymers, polymer thin films, and surface-confined polymer brushes may be produced using the catalyst.
Abstract:
A method of polymerizing a conjugated diene with an aromatic vinyl compound by block copolymerization, characterized by homopolymerizing the conjugated diene in the presence of a catalyst composition which comprises (A) a metallocene-form complex of a rare earth metal compound and (B) an ionic compound consisting of a non-coordinating anion and a cation and/or an aluminoxane and then adding the aromatic vinyl compound; and a catalyst composition for use in the polymerization of a conjugated diene or the copolymerization of a conjugated diene with an aromatic vinyl compound, which comprises (D) a neodymium complex and (B) an ionic compound consisting of a non-coordinating anion and a cation and/or an aluminoxane.
Abstract:
The invention provides an olefin polymer having a narrow molecular weight distribution and a molecular weight falling in a specified range; an olefin polymer having functional groups at the ends;a tapered polymer whose polymer chain contains a segment wherein the monomer composition varies continuously; an olefin polymer comprising different segments in a combined state; and processes for the production of these polymers. Specifically, a polymer of a C2-20 olefin having a number-average molecular weight of 500 orabove and an Mw/Mn ratio of 1.5 or below; and a process for the production of olefin polymers by polymerizing a C2-20 olefin in the presence of a polymerization catalyst for olefins containing a transition metal compound represented by general formula (I): LmMXn wherein M is any of Group 3 to 11 transition metal elements of the periodic table; m is 1 to 5; n is a number satisfying the valency of M; L is a ligand coordinated to the central metal M,which has a heteroatom not bonded directly to the central metal; and X is halogeno, a hydrocarbon group, or the like.
Abstract:
The invention relates to a method for the production of polymers from N-vinyl compounds, characterized in that vinyl compounds are polymerized in the presence of radicals of general formula (I), wherein Q stands for NR or S and T stands for CR R or S and R , R , R and R can be identical to or different from each other and independently stand for hydrogen, C1- to C20-alkyl or C6- to C18-aryl.
Abstract:
The invention relates to a method for homopolymerization of vinyl-aromatic monomers or copolymerization of vinyl-aromatic monomers or dienes in the presence of at least one alkali metal organyl, at least one magnesium organyl and at least one aluminum organyl. The invention also relates to an initiator composition for implementing the inventive method.
Abstract:
The invention relates to the production of homopolymers, co-copolymers or block copolymers from cycloolefinic monomer units characterized in that polymerization occurs in the presence of a catalyst of general formula (I), and optionally in the presence of an additive, wherein the substituents and indices have the following meaning: M is a metal from group VIII B of the periodic table of elements; E1, E2 are independently from each other an element from group V A of the periodic table of elements; Z is a bridging structural unit; Ar stands for annelated aryl units independent of each other; L1, L2 stands for formally uncharged Lewis base ligands; X means monovalent or bivalent anions; k means 1 or 2; l, m, n represent 1 or 2, whereby m x n = 1.
Abstract:
A linear diblock copolymer of the general structure "Polymer A - linkage - Polymer B", wherein Polymer A is essentially a nonpolar polymeric entity being a copolymer of propylene and ethylene, with propylene representing 51 to 99 weight percent of Polymer A; and Polymer B is a polymeric polar entity; and the use of said diblock copolymer to modify polymer bulk and interfacial properties in end applications as well as the intermediate material Polymer A – linkage useful in the manufacture of the diblock copolymer.