Abstract: A method for producing a composition having a disperse phase with small particle size dispersed in a continuous phase and having greater than 20% by volume of a disperse phase. The method comprising a permeation step, wherein a mixture of a continuous phase liquid and a disperse phase liquid simultaneously permeate a circumferential surface of a cylinder, which is partially or wholly composed of a porous membrane. The cylinder having outlets for the composition in the cross sections of both ends of the cylinder. The porous membrane having an average pore size of not smaller than 5 ?m at a membrane permeation rate of not lower than 50 m3/m2h. The porous membrane cylinder having a longitudinal effective membrane length, L, the internal diameter of the outlets, d, and the membrane permeation rate, F, which satisfy the relationships disclosed herein of L/d and F.

Abstract: To provide a chloroprene rubber composition providing good permanent compression set and excellent mechanical strength, a vulcanizate of the composition, and a molded article of the composition. A chloroprene rubber composition including a chloroprene rubber and a natural rubber in a total amount of 100 parts by mass, a copolymer of styrene and butadiene in an amount of 0.1 to 10 parts by mass, ethylene thiourea in an amount of 0.1 to 3.0 parts by mass, and dipentamethylenethiuram tetrasulfide in an amount of 0.1 to 3.0 parts by mass is vulcanized after or during molding of the composition to yield a vulcanized molding.

Abstract: An object of the invention is to provide a chloroprene polymer composition resistant to discoloration under heat or light. Provided is a chloroprene rubber composition, prepared by carrying out emulsion polymerization in the presence of 0.5 to 7.0 parts by mass of a rosin acid salt as emulsifier and terminating the emulsion polymerization by addition of a polymerization inhibitor and a phosphorus- or phenol-based compound as antioxidant. It is possible according to the invention to obtain a chloroprene polymer composition superior in discoloration resistance under heat or light. The chloroprene polymer composition according to the present invention can be used favorably for adhesion of cloths, leathers, foamed sheets, papers, woods, shoe parts, and others.

Abstract: To provide a chloroprene rubber composition that provides excellent low temperature characteristics such as low temperature permanent compression set and dynamic characteristics at low temperature and provides good permanent compression set, mechanical strength, and processing characteristics also at high temperature thus to achieve excellent characteristics within a wide temperature region, and a vulcanizate and a molding thereof. To a chloroprene rubber including a 2,3-dichlorobutadiene unit in an amount of 5 to 20% by mass, a natural rubber is added so as to give a ratio (chloroprene rubber/natural rubber) of 60/40 to 95/5 by mass ratio. Then, with respect to 100 parts by mass of the rubber components, ethylene thiourea is added in an amount of 0.1 to 3.0 parts by mass and dipentamethylenethiuram tetrasulfide is added in an amount of 0.1 to 3.0 parts by mass, thereby preparing the chloroprene rubber composition.

Abstract: There is provided a method of producing a composition having a continuous phase and a disperse phase dispersed finely with low polydispersity in the continuous phase, with high production efficiency. The composition is produced by the production method including the steps of: (A) passing the swirling flow of the continuous phase liquid into a cylindrical body the circumferential surface of which is either in part or entirely formed by a porous membrane, (B1) supplying the disperse phase fluid to the swirling flow via the porous membrane to form the particles of the disperse phase on the porous membrane, and (B2) detaching the disperse phase particles formed on the porous membrane by the shear force of the swirling flow.

Abstract: The disclosure relates to methods of making polymer particles, said methods including the steps of: making an aqueous gel reaction mixture; forming an emulsion having dispersed aqueous phase micelles of gel reaction mixture in a continuous phase; adding an initiator oil comprising at least one polymerization initiator to the continuous phase; and performing a polymerization reaction in the micelles. Further, the initiator oil is present in a volume % relative to a volume of the aqueous gel reaction mixture of between about 1 vol % to about 20 vol %. The disclosure also relates to methods of making nucleic acid polymer particles having the same method steps and wherein the aqueous gel reaction mixture includes a nucleic acid fragment, such as a primer.

Abstract: A method for producing polymer particles includes a suspension step of suspending a first liquid mixture containing an oily olefin monomer and a radical polymerization initiator in a second liquid mixture containing water, an iodide ion, and an iodine molecule, to prepare a suspension in which an oil droplet containing the oily olefin monomer and the radical polymerization initiator is dispersed in the water containing the iodide ion and the iodine molecule, a synthesis step of synthesizing an iodine compound by allowing a radical generated by cleavage of the radical polymerization initiator to react with the iodine molecule in the oil droplet, and a polymerization step of polymerizing the oily olefin monomer in the oil droplet.

Abstract: There is provided a method of producing a composition having a continuous phase and a disperse phase dispersed finely with low polydispersity in the continuous phase, with high production efficiency. The composition is produced by the production method including the steps of: (A) passing the swirling flow of the continuous phase liquid into a cylindrical body the circumferential surface of which is either in part or entirely formed by a porous membrane, (B1) supplying the disperse phase fluid to the swirling flow via the porous membrane to form the particles of the disperse phase on the porous membrane, and (B2) detaching the disperse phase particles formed on the porous membrane by the shear force of the swirling flow.

Abstract: The present invention discloses an emulsion polymerization process that comprises: (1) preparing an aqueous polymerization medium which is comprised of (a) at least one monomer, (b) a polymerization control agent, and an emulsifier, wherein the emulsifier is prepared in-situ within the aqueous polymerization medium; and (2) initiating polymerization of said monomer within the aqueous polymerization medium.

Abstract: The present invention relates to a method of producing polymers by free-radical polymerization in solution, wherein the polymerization initiator used is an ethanol-soluble initiator, and the solution polymerization is carried out in an alcoholic solvent which comprises 5 to 50% by weight of water.

Abstract: The present invention discloses an emulsion polymerization process that comprises: (1) preparing an aqueous polymerization medium which is comprised of (a) at least one monomer, (b) a polymerization control agent, and an emulsifier, wherein the emulsifier is prepared in-situ within the aqueous polymerization medium; and (2) initiating polymerization of said monomer within the aqueous polymerization medium.

Abstract: New anti-reflective or fill compositions having improved flow properties are provided. The compositions comprise a dendritic polymer dispersed or dissolved in a solvent system, and preferably a light attenuating compound, a crosslinking agent, and a catalyst. The inventive compositions can be used to protect contact or via holes from degradation during subsequent etching in the dual damascene process. The inventive compositions can also be applied to substrates (e.g., silicon wafers) to form anti-reflective coating layers having high etch rates which minimize or prevent reflection during subsequent photoresist exposure and developing.

Abstract: New anti-reflective or fill compositions having improved flow properties are provided. The compositions comprise a dendritic polymer dispersed or dissolved in a solvent system, and preferably a light attenuating compound, a crosslinking agent, and a catalyst. The inventive compositions can be used to protect contact or via holes from degradation during subsequent etching in the dual damascene process. The inventive compositions can also be applied to substrates (e.g., silicon wafers) to form anti-reflective coating layers having high etch rates which minimize or prevent reflection during subsequent photoresist exposure and developing.

Abstract: The present invention discloses an emulsion polymerization process that comprises: (1) preparing an aqueous polymerization medium which is comprised of (a) at least one monomer, (b) a polymerization control agent, and an emulsifier, wherein the emulsifier is prepared in-situ within the aqueous polymerization medium; and (2) initiating polymerization of said monomer within the aqueous polymerization medium.

Abstract: The present invention discloses an emulsion polymerization process that comprises: (1) preparing an aqueous polymerization medium which is comprised of (a) at least one monomer, (b) a polymerization control agent, and an emulsifier, wherein the emulsifier is prepared in-situ within the aqueous polymerization medium; and (2) initiating polymerization of said monomer within the aqueous polymerization medium.

Abstract: The present invention relates to a process for the gas-phase (co-)polymerization of olefins in a fluidized bed reactor wherein fouling is prevented and/or flowability of polymer is improved thanks to the use of a process aid additive.

Abstract: The invention provides a flocculant which in sludge dewatering gives flocs having an excellent balance among flocculating strength, filtration rate and moisture content, and a method of sludge dewatering with the flocculant. Namely, the flocculant is a polymeric flocculent which contains a copolymer having alkoxyalkyl units or a poly(alkylene oxide) unit and further having water-soluble monomer units; and the method of sludge dewatering includes adding the polymeric flocculant to a sludge after or without adding an inorganic flocculent or an organic cationic compound thereto and then dewatering the sludge.

Abstract: A process is presented for the preparation of a latex by the emulsion polymerization at a temperature of between 30 and 90 C. of at least one ethylenically unsaturated monomer in the presence of at least one surfactant and of a seed of polymer particles with a diameter of between 200 and 450 nm. The seed particles represent from 5-25% by weight of the total weight of the monomer and seed. The polymerization is initiated by a mixed water-soluble/fat-soluble system. Also included are lattices obtained from this process.

Abstract: The present invention pertains to a process for controlled free radical polymerization or copolymerization of vinyl chloride at a temperature between 40° C. and 95° C., at a pressure between 5 and 30 bar in the presence of a stable free nitroxyl radical.

Abstract: A process for working up polymer components prepared by emulsion polymerization is disclosed. The process is characterized in that coagulation of the aqueous polymer latex present after emulsion polymerization is performed using a combination of A) an aqueous solution of at least one salt selected from the group consisting of sodium chloride, calcium chloride, magnesium chloride, aluminum chloride, sodium sulfate, magnesium sulfate and aluminum sulfate, B) an aqueous solution of at least one salt of an acid selected from the group consisting of hypophosphorous acid (H3PO2), phosphorous acid (H3PO3 or HPO2) and ascorbic acid and optionally C) an aqueous dilute acid selected from the group consisting of sulfuric acid, phosphoric acid and acetic acid.

Abstract: A composition and a process for producing the composition are disclosed. The composition comprises a titanium chelate polymer and a stabilizer. The process can comprise (1) contacting a tetraalkyl titanate with a chelating agent to produce a product mixture comprising a titanium chelate and an alcohol; (2) contacting the product mixture with water under a condition effective to produce a dispersion of a titanium chelate polymer; (3) optionally reducing the alcohol content of the dispersion; and (4) contacting the dispersion with a stabilizing amount of a stabilizer to produce a stable dispersion of titanium chelate polymer.

Abstract: A process for preparing copolymers based on vinyl esters and ethylene and, if desired, further comonomers in the form of their aqueous dispersions, having a solids content of greater than 65% and a Brookfield viscosity (20 s−1) of less than 10,000 mPa·s, by means of free-radically initiated polymerization of one or more monomers selected from vinyl esters and ethylene and, if desired, further monomers copolymerizable therewith, in the presence of one or more protective colloids, polymerization being conducted in the presence of from 2 to 15% by weight of seed latex, based on the amount of vinyl ester, said process comprising a) polymerizing without adding emulsifier, and in the presence of one or more polyvinyl alcohols protective colloids having a degree of hydrolysis of from 80 to 95 mol % and a Höppler viscosity in 4% strength aqueous solution of from 3 to 30 mPa·s, and b) introducing the seed latex in a fraction of from 30 to 75% by weight before beginning the polymerization and

Abstract: A water and oil repellent aqueous dispersion is provided which is excellent in water and oil repellency and waterdrop rolling property and has dispersion stability even in the presence of co-agents and contaminants in the treatment bath. A preparative process comprises emulsifying a stock composition containing a polymerizable monomer containing a (meth)acrylate having perfluoroalkyl group as an essential component, a non-fluorine type surfactant containing no aromatic group, water and a solvent having a viscosity of at least 3 cP at 25° C. under pressure and polymerizing the stock composition.

Abstract: An air-activatable polymerisable composition useful, in the field of adhesives, sealants, surface coatings, moulding resins and composite matrices, comprises: a) at least one free-radically polymerisable monomer, b) an activator system for effective polymerisation of the free-radically polymerisable monomer, said activator system comprising at least one auto-oxidisable compound which is a beta diketone, c) a soluble ionic salt, particularly a transition metal salt, d) and a weak acid or a latent weak acid, with the proviso that the composition does not contain a peroxide, or a peroxide precursor which produces peroxide in the absence of air, or any ingredient which is a significant source of radicals in the absence of air.

Abstract: Use of surfactants in the suspension polymerization of fluorinated monomers for preparing fluoropolymers containing hydrogen, said surfacants having the general formula:

Abstract: The present invention relates to processes for industrially advantageously producing, in high yields, an N,N-dialkylallylamine polymer or an addition salt thereof, a copolymer of N,N-dialkylallylamine and monoallylamine or an addition salt thereof, and a copolymer of N,N-dialkylallylamine and diallylamine or an addition salt thereof, which are useful for various uses in the field of fine chemicals and particularly useful as a water-resistance-imparting agent for an inkjet ink.

Abstract: Polyvinyl ester dispersions which can be employed as binders in building materials, preferably in the form of redispersible plastics powders, are obtained by polymerization of at least one vinyl ester and optionally other monomers which can be copolymerized with vinyl ester, by use of water-soluble cationic azo initiator.

Abstract: A rigid chain entanglement crosslinked polymer made by dispersing at lease one monomer and at least one initiator in an immiscible liquid medium to form a liquid dispersion; and decomposing the initiator in the fluid dispersion to activate polymerization and thereby produce a chain entanglement crosslinked polymer; and the polymer that can be utilized as proppants, as ball bearings, as lubriglide monolayers, and for drilling mud applications