摘要:
A group of compounds defined by the general formula (I) can be used to anionically initiate polymerization of unsaturated monomers. In the formula, M is an alkali metal atom, R1 is an aryl group having at least one OR2 substituent group where each R2 is a group that is nonreactive toward M, and R is a hydrocarbyl group. The subject initiators can be used in semi-batch and continuous polymerization processes, even those which are performed at elevated temperatures.
摘要:
A novel class of lanthanide metal phenoxyimine complexes can be used as an ingredient of a catalyst system. The catalyst system can be used in polymerizations of ethylenically unsaturated hydrocarbon monomers.
摘要:
A functionalized polymer includes the reaction product of a reactive polymer and a compound that includes an aryl group having at least one directly bonded OGp substituent, where Gp is a protecting group, and a substituent (Q) which is free of active hydrogen atoms and which is, or connects to the aryl group through, a moiety that includes a carbon-to-nitrogen multiple bond. The polymer can be provided from a solution that includes one or more types of ethylenically unsaturated monomers which include at least one type of polyene, particularly one or more conjugated dienes in certain embodiments. An active terminus of the resulting reactive polymer can react with the Q substituent of the compound so as to provide a polymer having as a terminal functionality the radical of a compound that includes an aryl group having at least one directly bonded OGp substituent.
摘要:
A process for preparing a copolymer of an acyclic conjugated diene and a cyclic conjugated diene using a polymerization catalyst system comprising a transition metal compound or a lanthanide metal compound, an alkylating agent, and an inorganic halide alcoholate, and rubber compositions and tires comprising the same. The copolymer contains at least 90% acyclic conjugated diene monomer, has a number average molecular weight of between 40,000 and 300,000, and has a cis-bond content of at least 92%.
摘要:
A novel class of aminidate complexes can be used as an ingredient of a catalyst system. The catalyst system can be used in polymerizations of ethylenically unsaturated hydrocarbon monomers.
摘要:
Cationic techniques can be used to polymerize monomers that include a class of hydroxyaryl compounds so as to provide polymers that exhibit desirable properties including, but not limited to, reduced hysteresis. Compositions such as vulcanizates in which such polymers can be utilized and products such as tire components that incorporate and/or are manufactured from such compositions also are provided.
摘要:
Provided is a composition comprising at least one polymer having a degree of unsaturation of no more than about 50 mol %; a filler selected from the group consisting of carbon black, silica, and mixtures thereof; and a polymeric additive comprising a functional end group reactive with said filler, wherein said polymeric additive has a degree of unsaturation of no more than about 50 mol % and a number average molecular weight between about 1,000 and about 25,000. The composition may optionally contain one or more polymers having a degree of unsaturation of more than 50 mol %. The composition may be particularly useful as a component for a tire.
摘要:
Poly(propylene carbonates) are prepared from propylene oxide and CO2 with less than 10% cyclic propylene carbonate by product using cobalt based catalysts of structure preferably in combination with salt cocatalyst, very preferably cocatalyst where the cation is PPN+ and the anion is Cl− or OBzF5−. Novel products include poly(propylene carbonates) having a stereoregularity greater than 90% and/or a regioregularity of greater than 90%.
摘要翻译:聚(丙烯碳酸酯)由环氧丙烷和CO 2与小于10%的环状碳酸亚丙酯制成,使用优选结合盐助催化剂的钴基催化剂,非常优选助催化剂,其中阳离子为 PPN + +和 - 阴离子是Cl - O - 或 - O - Z - 。 新产品包括立构规整度大于90%和/或大于90%的区域规整度的聚(丙烯碳酸酯)。
摘要:
Embodiments of the present disclosure are directed to functionalized copolymers produced by copolymerization of at least one conjugated diolefin monomer and at least one vinyl monomer, the functionalized copolymer including at least one functional group having silica reactive moieties, wherein the functionalized copolymer has a degree of hydrogenation of 75% to 98 mol % as measured using proton nuclear magnetic resonance spectroscopy (1H NMR). In one or more embodiments, the silane modifier may include an oxygen-containing moiety, wherein the oxygen atom of the oxygen-containing moiety may not be directly bonded with the silicon atom.
摘要:
Vulcanizates with desirable properties can be obtained from compositions incorporating polymers that include hydroxyl group-containing aryl functionalities, silica or other particulate filler(s) that contain or include oxides of silicon and a group or compound that can act to covalently bond the filler particles and the polymer. The group can be provided as a substituent of the filler particle, or a discreet compound can be provided in the composition.