Abstract: Disclosed are the following: a cement dispersant which is excellent in initial dispersibility and further in flow retainability of cement, because of using a polymer having a proper molecular weight distribution; a process for producing this cement dispersant; and a cement composition using this cement dispersant. The cement dispersant comprises a water-soluble polymer (P) as a main component, and is characterized by displaying an area proportion (a value (A?B) given by subtracting an area ratio B of a lower molecular weight side portion from an area ratio A of a higher molecular weight side portion) in the range of 13 to 60%.

Abstract: The present invention relates to a process for controlled radical polymerization using an organosulfur reversible chain transfer agent which consists in preparing polymers having a molar weight of greater than 100 000 g/mol, with a polydispersity index of less than 1.2 for molar weights of less than 200 000 g/mol and of less than 1.4 for molar weights of greater than 200 000 g/mol, with a degree of conversion of monomer of greater than 75% and a polymerization time of less than 8 h, characterized by the control of the flux of initiator radicals in the polymerization medium. The control of the flux of initiator radicals can be achieved by the use of two appropriate polymerization temperatures T1 and T2 or by use of an initiator having a decomposition rate constant which is greater than that of azobisisobutyronitrile at the same temperature.

Abstract: A method for preparing a cyclic olefin polymer is described. The method includes polymerizing cyclic olefin monomers or a cyclic olefin monomer with ethylene to prepare a cyclic olefin polymer solution; slowly adding a non-solvent drop wise to the cyclic olefin polymer solution to precipitate a cyclic olefin polymer; and filtering and drying the precipitated cyclic olefin polymer. In addition, the cyclic olefin polymer prepared using this method is described. According to the present invention, a spherical cyclic olefin polymer having a high bulk density can be easily separated from the cyclic olefin polymer solution by precipitation.

Abstract: Provided are a high melting point copolymer prepared by heat-polymerizing cyclopentadiene and/or dicyclopentadiene and a vinyl-substituted aromatic compound, wherein a use amount of a solvent in heat polymerization is 0.1 time or more and less than 0.5 time based on the mass of the whole monomers, and the copolymer has a softening point falling in a range of 100 to 135° C., and a hydrogenated copolymer obtained by hydrogenating the above high melting point copolymer. The hydrogenated copolymer of the present invention is suitably used as an adhesion-providing resin having a high softening point for a hot melt adhesive.

Abstract: Methods for controlling a melt viscosity of a polyolefin, controlling comonomer distribution of a polyolefin, achieving a targeted melt viscosity of a polyolefin, and films made from such polyolefins are provided. The methods include contacting an olefin monomer and at least one comonomer with a catalyst system in the presence of a condensable fluid comprising a saturated hydrocarbon having from 2 to 8 carbon atoms. The catalyst system in one embodiment includes a hafnium metallocene catalyst component.

Abstract: This invention relates to a process for controlling the architecture of copolymers of at least two unsaturated monomers, made by free-radical polymerization in the presence of a cobalt-containing chain transfer agent, including the control of molecular weight, degree of branching and vinyl end group termination, by varying at least one of the variables of molar ratio of monomers, their relative chain transfer constants, polymerization temperature and degree of conversion and amount of cobalt chain transfer agent; and polymers made thereby.

Abstract: The invention pertains to a process wherein initiators and protective colloids are both metered to a polymerization mixture. This manner of metering allows for improved control of the polymerization rate and an improved reactor space-time yield, and the process will render a polymer with a relatively high porosity.

Abstract: A latex having a reduced amount of 4-phenylcyclohexene is obtainable by reacting A) 30–90% by weight of at least one ethylenically unsaturated monomer; B) 70–10% by weight of a diene; C) 1–10% by weight of ?,?-unsaturated carboxylic acids, carboxylic acid nitriles, carboxylic acid amides, or mixtures thereof; and D) an auxiliary, an additive or mixtures thereof. The reaction follows a gradient regime for components A and B.

Abstract: An organic porous material having a continuous pore structure, which comprises interconnected macropores and mesopores with a radius of 0.01 to 100 ?m in the walls of the macropores, having a total pore volume of 1 to 50 ml/g and having pore distribution curve characteristics wherein the value obtained by dividing the half-width of the pore distribution curve at the main peak by the radius at the main peak is 0.5 or less. The organic porous material is useful as an adsorbent having high physical strength and excelling in adsorption amount and adsorption speed, an ion exchanger excelling in durability against swelling and shrinkage, and a filler for chromatography exhibiting high separation capability.

Abstract: The present invention relates to a method of producing multimodal polyolefins using at least one or more activated metallocene catalysts. The activated metallocene catalysts are used in combination in a single-process method. The method allows for the production of multimodal polyolefins of tunable composition, molecular weight and polydispersity.

Abstract: A dual olefin polymerization process is disclosed. The process uses a bridged indenoindolyl ligand-containing Group 4 transition metal complex and an activator. It is carried out in multiple stages or in multiple reactors. The same complex and the same activator are used in all stages or reactors. Different polyolefins are made in different stages or reactors by varying the monomer compositions, hydrogen concentrations, or both. The process of the invention produces polyolefins which have broad molecular weight distributions, composition distributions, or both.

Abstract: Disclosed are the following: a cement dispersant which is excellent in initial dispersibility and further in flow retainability of cement, because of using a polymer having a proper molecular weight distribution; a process for producing this cement dispersant; and a cement composition using this cement dispersant. The cement dispersant comprises a water-soluble polymer (P) as a main component, and is characterized by displaying an area proportion (a value (A?B) given by subtracting an area ratio B of a lower molecular weight side portion from an area ratio A of a higher molecular weight side portion) in the range of 13 to 60%.

Abstract: Disclosed are methods of preparing solution polymers and compositions derived therefrom.

Abstract: In a process for the polymerization of ethylene and optionally further monomers in a high-pressure reactor at from 120 to 350° C. and pressures of from 1000 to 4000 bar, hydrogen is intermittently introduced into the reactor.

Abstract: The invention pertains to a polymer obtainable from the steps: polymerizing a mixture, that is substantially free or organic solvents, of ethylenically unsaturated monomers which consist for at least 70% of methacrylates, and which comprises specific chain transfer agents, ?-methylstyrene dimer being preferred, to form a first polymer, aqueous emulsion polymerizing a mixture comprising ethylenically unsaturated monomers in the presence of the first polymer to form a dispersion of a water-insoluble second polymer, wherein these steps are preferably performed in the absence or the substantial absence of a surfactant.

Abstract: A method for controlling resin properties during the production of polyolefins is provided. The method utilizes coordinated manipulation of reaction temperature in combination with a secondary process variable to control resin flow properties to rapidly respond to manufacturing upsets or specification changes to minimize off-grade or transition polymer material when moving from one polymer grade to another, or during a disturbance in a steady state production.

Abstract: Copolymers of zwitterionic monomer, especially 2-methacryloyloxyethyl-2?-trimethylammoniumethyl phosphate inner salt, and hydrophobic comonomer, especially dodecylmethacrylate, are made in a monomer starved polymerization process in which solutions of monomers are fed to the reaction vessel in which initiator is present over an extended period. The copolymers have improved compositional uniformity and provide better coatings on a range of substrates. The novel copolymers can be distinguished from prior art batch type bulk solution polymerization polymers of the same monomer composition by solubility characteristics especially in alcohol/water mixtures. Particularly preferred coating compositions comprise an alcohol:water mixture containing around 20 to 40% by volume alcohol.

Abstract: An organic porous material having a continuous pore structure, which comprises interconnected macropores and mesopores with a radius of 0.01 to 100 ?m in the walls of the macropores, having a total pore volume of 1 to 50 ml/g and having pore distribution curve characteristics wherein the value obtained by dividing the half-width of the pore distribution curve at the main peak by the radius at the main peak is 0.5 or less. The organic porous material is useful as an adsorbent having high physical strength and excelling in adsorption amount and adsorption speed, an ion exchanger excelling in durability against swelling and shrinkage, and a filler for chromatography exhibiting high separation capability.

Abstract: It is possible to provide the heat resistant material and coating material for OA equipment which comprise a fluorine-containing multi-segment polymer having heat resistance, abrasion resistance, non-sticking property against toner and oil resistance in addition to flexibility and are used particularly on surfaces of fuser roll and belt. Those materials comprise a fluorine-containing multi-segment polymer having an elastomeric fluorine-containing polymer chain segment A and a non-elastomeric fluorine-containing polymer chain segment B, and the elastomeric fluorine-containing polymer chain segment A comprises not less than 90% by mole of perhaloolefin unit as a recurring unit and imparts flexibility to the whole polymer.

Abstract: This invention relates to a method for controlling copolymer architecture by a two-part process. In the first step, a monomer analysis is obtained from a test polymerization having constant rate co-monomer addition. In the second step a copolymer is polymerized using a co-monomer feed rate that has been adjusted based on the monomer analysis to produce a copolymer with highly controlled polymer architecture. The method can predict feeds rates to produce any desired polymer architecture from a purely random polymer to a tapered polymer. The method works for terpolymers as well as copolymers.

Abstract: The present invention relates to a method for preparing a copolymer containing a combined linear and nonlinear block, that is, mikto block, a copolymer prepared from the method, and usages of the copolymer. More particularly, the present invention provides a novel method for preparing a multi-component copolymer by polymerization using a multifunctional compound and one charge of an initiator, and a copolymer having a mikto block including different types of terminal blocks.

Abstract: This invention relates to a method for controlling copolymer architecture by a two-part process. In the first step, a monomer analysis is obtained from a test polymerization having constant rate co-monomer addition. In the second step a copolymer is polymerized using a co-monomer feed rate that has been adjusted based on the monomer analysis to produce a copolymer with highly controlled polymer architecture. The method can predict feeds rates to produce any desired polymer architecture from a purely random polymer to a tapered polymer. The method works for terpolymers as well as copolymers.

Abstract: Block copolymers are prepared by living-type or semi-living type free radical polymerization, with said copolymers having at least one random block comprised of at least one hydrophobic monomer and at least one hydrophilic monomer. The selection of hydrophobic and hydrophilic monomers in the random block is determined by the relative hydrophobicity of the monomers to impart selected solubility or dispersability in water and/or alcohols of the overall block copolymer.

Abstract: A method of preparing a (meth)acrylate functionalised polymer comprising the steps of mixing together a monofunctional vinylic monomer with from 0.3-100% w/w (based on monofunctional monomer) of a polyfunctional vinylic monomer and from 0.0001-50% w/w of a chain transfer agent, reacting said mixture to form a polymer and terminating the polymerisation reaction before 99% conversion. The resulting polymers are useful as components of surface coatings and inks, as moulding resins or in curable compounds, e.g. curable moulding resins or photoresists.

Abstract: The present invention is directed, in part, to improved polymer compositions and processes for preparing same. Specifically, in one embodiment, there is provided a process for preparing a polymer, wherein the process comprises: providing a reaction mixture comprising a portion of at least one polar monomer and at least one multivalent cation; adding the remaining portion of the polar monomer to the reaction mixture; and polymerizing the monomer to form the polymer. In certain embodiments, the reaction mixture in the providing step comprises at least two molar equivalents or greater of the total amount of polar monomer with respect to one molar equivalent of multivalent cation.

Abstract: The present invention is a method of preparing an acrylic copolymer using as a raw material a monomer mixture comprising 50 mole % or more of a monomer having a polymerizable double bond formed by a carbon atom to which no hydrogen atom is bonded and a carbon atom to which a hydrogen atom is bonded, wherein after the polymerization is carried out at a polymerization temperature of 150° C. or higher, further heating at 80-130° C. is done. The present invention can provide a method of preparing an acrylic copolymer with a low amount of unreacted monomers using high temperature polymerization at 150° C. or higher.

Abstract: This invention concerns functional fluorine-containing copolymers compositions and ionomers derived therefrom. The ionomers formed are useful in electrochemical applications such as batteries, fuel cells, in exchange membranes, sensors and the like.

Abstract: An aqueous semi-continuous emulsion polymerization process for producing bimodal polymer particles in volumes large than a single batch size is provided. A bimodal polymer composition prepared by the process of carrying out an aqueous semi-continuous emulsion polymerization is also provided.

Abstract: The invention relates to a method for reducing odor emissions of aqueous aromatic vinyl-1,3-diene-copolymer dispersions which have been stabilized with a protective colloid. The invention also relates to redispersion powders obtained by drying said dispersions. This is achieved by emulsion polymerization of a mixture containing at least one aromatic vinyl and at least one 1,3-diene in the presence of one or more protective colloids and by optionally drying the polymer dispersion obtained thereby. The invention is characterized in that 0.01 to 15.0 wt. % of one or more monomers selected from the group of branched or unbranched alkyl esters containing 1 to 8 carbon atoms in the alkyl radical of monounsaturated mono- or dicarboxylic acids are added at the end of the polymerization when the total content of the aqueous polymer dispersion containing free monomers ranges from >0 to ≦20 wt. %, whereby the given wt. % refers to the polymer content of the dispersion.

Abstract: The present invention provides: a novel water-soluble copolymer which is excellent in performance for uses, such as detergent builders, pigment dispersants, and scale inhibitors. In addition, the present invention provides: a novel liquid detergent builder which has extremely excellent compatibility, high transparency when a liquid detergent composition comprises it, and excellent detergency; and a novel liquid detergent composition comprising the liquid detergent builder.

Abstract: A method of preparing a (meth)acrylate functionalised polymer comprising the steps of mixing together a monofunctional vinylic monomer with from 0.3-100% w/w (based on monofunctional monomer) of a polyfunctional vinylic monomer and from 0.0001-50% w/w of a chain transfer agent, reacting said mixture to form a polymer and terminating the polymerisation reaction before 99% conversion. The resulting polymers are useful as components of surface coatings and inks, as moulding resins or in curable compounds, e.g. curable moulding resins or photoresists.

Abstract: A method of lowering MFR response of a high-melt-flow-rate-polymer-producing metallocene catalyst is provided. The method includes contacting the metallocene catalyst with a sufficient quantity of &agr;,&ohgr;-diene monomer such that when the catalyst composition is contacted with polymerizable reactants under suitable polymerization conditions, the resulting polymer has an MFR rate in the range of 0.1 to 1000. Hydrogen and ethylene may also be present in the polymerization. Additionally a catalyst composition is provided which includes a high-melt-flow-rate-polymer-producing metallocene catalyst and a sufficient quantity of &agr;,&ohgr;-diene monomers such that when the catalyst composition is contacted with a monomer under polymerization conditions, the resulting polymer has an MFR rate in the range of 0.1 to 1000.

Abstract: The present invention relates to a copolymer for use in paints, resists, and the like; a method for manufacturing the same; and a resist composition using the same. The copolymer according to the present invention is obtained by means of polymerizing at least one monomer containing an alicyclic structure and one monomer containing a lactone structure, and the distribution of the copolymer composition of said monomer containing a lactone structure in said copolymer is in the range of −10 to +10 mol % of the average copolymer composition of said monomer containing a lactone structure in said entire copolymer. In addition, the copolymer according to the present invention is obtained by means of polymerizing a monomer containing an alicyclic structure, a monomer containing a lactone structure, and another vinyl monomer comprising a higher polarity than said monomer containing an alicyclic structure, but a lower polarity than said monomer containing a lactone structure.

Abstract: The present invention relates to selectively hydrogenated block copolymers where one of the blocks is a random copolymer of a mono-alkenyl arene monomer, such as styrene, and a 1,3-cyclodiene monomer, such as 1,3-cyclohexadiene, and one of the other blocks is a hydrogenated polymer or copolymer of an acyclic conjugated diene, such as 1,3-butadiene or isoprene.

Abstract: An aqueous semi-continuous emulsion polymerization process for producing bimodal polymer particles in volumes large than a single batch size is provided. A bimodal polymer composition prepared by the process of carrying out an aqueous semi-continuous emulsion polymerization is also provided.

Abstract: A novel alicyclic hydrocarbon copolymer having a weight average molecular weight (Mw) of 1,000-1,000,000 a comprising repeating units (a) having an alicyclic structure and repeating units (b) having a chainlike structure; the sum of repeating units (a) and repeating units (b) being at least 90 wt. % based on the copolymer, and the content of repeating units (b) being at least 1 wt. % but smaller than 10 wt. %, based on the copolymer; and the chain of repeating units (a) satisfying the formula: A≦0.3×B where A=weight average molecular weight of the chain of repeating units (a), and B=Mw of the copolymer×(number of repeating units (a)/number of the total repeating units constituting the copolymer). The copolymer exhibits low birefringence and high mechanical strength. A process for producing the copolymer is provided.

Abstract: A coating composition containing an emulsion polymer prepared with up to about 20% by weight, based on total polymerizable monomers, of addition polymerizable esters of the glycidyl esters of tertiary acids having 9 or more carbon atoms, preferably up to 18 carbon atoms, and particularly having 9 to 11 carbon atoms has improved application properties and produces coatings with better appearance and less water sensitivity. The emulsion polymerization process of the invention produces less coagulum without having to increase the amount of surfactant.

Abstract: There is provided a process for producing a modified polymer rubber, which comprises the steps of:

Abstract: The present invention relates to a bimodal linear block copolymer containing a tapered block and its manufacturing method. The bimodal linear block copolymer includes a hexa-block copolymer of vinyl aromatic block(PS1)-conjugated diene block(PB1)-tapered block(T1)-vinyl aromatic block(PS2-PS3)-conjugated diene block(PB2)-vinyl aromatic block (PS4) as prepared by adding two charges of an initiator, and a tri-block copolymer of vinyl aromatic block(PS3)-conjugated diene block(PB2)-vinyl aromatic block (PS4). The bimodal linear block copolymer is prepared by adding more than one charge of the initiator, vinyl aromatic monomers and conjugated diene monomers to acquire transparency, toughness, rigidity and flexibility, and thereby can be used for sheets or films, or injection or blow molding products.

Abstract: To provide a process for producing polymer particles which are spherical and have smooth surfaces and small contents of oil- and the solvent-soluble at the time of being compounded. Polymer particles are produced by adding 0.099 to 47 parts by mass of a crosslinking vinyl monomer to 100 parts by mass of a vinyl monomer (referred to hereinafter as the monomer) during polymerization reaction at a degree of monomer polymerization of 1 to 100% in order to polymerize the monomer in a solvent in the presence of a dispersant and a polymerization initiator to give polymer particles.

Abstract: This invention relates to a process for controlling the architecture of copolymers of at least two unsaturated monomers, made by free-radical polymerization in the presence of a cobalt-containing chain transfer agent, including the control of molecular weight, degree of branching and vinyl end group termination, by varying at least one of the variables of molar ratio of monomers, their relative chain transfer constants, polymerization temperature and degree of conversion and amount of cobalt chain transfer agent; and polymers made thereby.

Abstract: The present invention is directed, in part, to improved polymer compositions and processes for preparing same. Specifically, in one embodiment, there is provided a process for preparing a polymer, wherein the process comprises: providing a reaction mixture comprising a portion of at least one polar monomer and at least one multivalent cation; adding the remaining portion of the polar monomer to the reaction mixture; and polymerizing the monomer to form the polymer. In certain embodiments, the reaction mixture in the providing step comprises at least two molar equivalents or greater of the total amount of polar monomer with respect to one molar equivalent of multivalent cation.

Abstract: The invention concerns a method for preparing stable (co)polymer dispersions in a polyol by polymerising in situ a monomer or a mixture of ethylenically unsaturated monomers, in the presence of one or several azocarboxylic acid ester(s).

Abstract: This invention relates to a process for controlling the architecture of copolymers of at least two unsaturated monomers, made by free-radical polymerization in the presence of a cobalt-containing chain transfer agent, including the control of molecular weight, degree of branching and vinyl end group termination, by varying at least one of the variables of molar ratio of monomers, their relative chain transfer constants, polymerization temperature and degree of conversion and amount of cobalt chain transfer agent; and polymers made thereby.

Abstract: A propylene/ethylene-&agr;-olefin block copolymer obtained by block-copolymerizing a polypropylene component with an ethylene-&agr;-olefin random copolymer component, which satisfies conditions of the following terms (I) to (III): (I) the content of the polypropylene component having an intrinsic viscosity ([&eegr;]) measured in tetralin at 135° C. of from 0.5 to 5.0 dl/g is from 5 to 95% by weight; (II) the content of the &agr;-olefin in the random copolymer component is from 5 to 40 mol %, and the content of the ethylene-&agr;-olefin random copolymer component whose &rgr; value represented by the following equation: &rgr;=2[E]·[A]/[EA] (wherein [E] represents a molar fraction of ethylene, [A] represents a molar fraction of the &agr;-olefin and [EA] represents a molar fraction of a diad chain of ethylene and the &agr;-olefin) is within the range from 0.5 to 1.

Abstract: A process is for preparing polyvinyl alcohol-stabilized addition polymers based on (meth)acrylate monomers in the form of their aqueous dispersions and water-redispersible dispersion powders by means of free-radically initiated emulsion polymerization or suspension polymerization of one or more monomers selected from the group consisting of the esters of acrylic acid and methacrylic acid and, if desired, further monomers copolymerizable therewith in the presence of one or more protective colloids from the group of the polyvinyl alcohols and, if appropriate, with drying of the resultant aqueous dispersion, which includes a) conducting polymerization in the presence of from 0.001% to 0.02% by weight of initiator and, if desired, from. 0.001% to 0.

Abstract: There is disclosed a method of producing a copolymer by polymerizing at least two monomers having different reactivity as constitutional components, comprising carrying out a polymerization while adding a monomer component B having high reactivity, to a solution of a monomer component A having low reactivity dissolved in a non-aqueous solvent having a boiling point of 55° C. to 120° C., in the presence of a polymerization initiator. The method can give a copolymer high in solubility and suitable for the processing by the flush vacuum dry system, and the method is excellent from the standpoint of the production capacity and stable/safe production throughout the process.

Abstract: A process as disclosed for producing a low density polyethylene using a particle form polymerization process and a titanium-containing catalyst wherein the ratio of comonomer to ethylene is at least about 1:1 and the titanium-containing catalyst is a special catalyst which has been pretreated with an organometallic reducing agent.

Abstract: Block copolymers comprise at least two hard blocks S1 and S2 made from vinylaromatic monomers and, between these, at least one random soft block B/S made from vinylaromatic monomers and from dienes, where the proportion of the hard blocks is above 40% by weight, based on the total block copolymer.

Abstract: A polymer composed overall of from 50 to 99.98 % by weight of C1-C12 alkyl (meth)acrylate a), from 0.02 to 10 % by weight of a vinylaromatic compound b), from 0 to 10 % by weight of an ethylenically unsaturated acid or of an ehtylenically unsaturated acid anhydride c),  and from 0 to 40% by weight of further monomers d), the percentages by weight being based on the polymer and the polymer being obtainable by polymerizing the monomers a) to d) in at least two stages which differ in their content of vinylaromatic compounds in such a way that the content of vinylaromatic compounds in the vinylaromatics-rich stage is at least 5 times as great as in the low-vinylaromatics stage.