Abstract: This invention discloses a process for synthesizing a hairy polymer particle which comprises the steps of (1) polymerizing a vinyl aromatic monomer by emulsion polymerization in an aqueous medium to produce core particles, (2) recovering the core particles from the aqueous medium, (3) dispersing the core particles in an organic solvent, (4) adding an organo-lithium compound to the dried core particles in the organic solvent to produce the hairless core initiator, and (5) utilizing the hairless core initiator to initiate the anionic polymerization of a conjugated diolefin monomer in an organic solvent to produce a solution of the hairy polymer particles. The hairy polymer nanoparticles can then be recovered from the organic solvent. These hairy polymer particles are comprised of (1) a core which is comprised of a polymer of a vinyl aromatic monomer and (2) hairs which are polymer chains of a conjugated diolefin monomer, wherein the hairs are covalently bonded to the core.

Abstract: A method for polymerizing conjugated diene monomer into polydienes, the method comprising: polymerizing conjugated diene monomer within a liquid-phase polymerization mixture that includes conjugated diene monomer, a lanthanide-based catalyst system, dicyclopentadiene or substituted dicyclopentadiene, and optionally organic solvent, with the proviso that the organic solvent, if present, is less than about 20% by weight based on the total weight of the polymerization mixture.

Abstract: Adhesive composition for bonding and filling large assemblies, including a mixture of about 5 percent to about 75 percent by weight of a thermoplastic polymer, about 0.5 percent to about 35 percent by weight of a polyester resin or vinyl ester resin, and about 20 percent to about 80 percent by weight of an alkyl acrylate or methacrylate monomer.

Abstract: A multistage propylene-based polymer including the following components (A) and (B): (A) 5 to 20 wt % of a propylene homopolymer component or a copolymer component of propylene and an ?-olefin with 2 to 8 carbon atoms having an intrinsic viscosity [?] of more than 10 dL/g in tetralin at 135° C.; and (B) 80 to 95 wt % of a propylene homopolymer component or a copolymer component of propylene and an ?-olefin with 2 to 8 carbon atoms having an intrinsic viscosity [?] of 0.5 to 3.0 dL/g in tetralin at 135° C.

Abstract: A process for producing a water-absorbent resin particle comprising subjecting a water-soluble ethylenically unsaturated monomer to a reverse phase suspension polymerization, characterized in that the process for producing a water-absorbent resin particle comprises the steps of (A) subjecting the water-soluble ethylenically unsaturated monomer to a first-step reverse phase suspension polymerization in a hydrocarbon-based solvent using a water-soluble radical polymerization initiator in the presence of a surfactant and/or a polymeric protective colloid, and optionally an internal crosslinking agent; (B) carrying out at least one step of the procedures of adding an aqueous solution of a water-soluble ethylenically unsaturated monomer containing a water-soluble radical polymerization initiator and optionally an internal crosslinking agent to a reaction mixture after the termination of the first-step reverse phase suspension polymerization in a state that the surfactant and/or the polymeric protective colloid is

Abstract: The present invention relates to a method of producing water-absorbent resin particles in which a median particle size of primary particles (d) and a median particle size of secondary particles (D) satisfy the relationship of the formula, 5d/3+150<D<5d+150, comprising the steps of: (1) subjecting a water-soluble ethylenically unsaturated monomer to a first-step reversed phase suspension polymerization reaction, in a petroleum hydrocarbon solvent, in the presence of a dispersion stabilizer, to give spherical primary particles having a median particle size (d) of from 30 to 130 ?m; (2) cooling the polymerization reaction solution, to precipitate the dispersion stabilizer; and (3) carrying out a second-step reversed phase suspension polymerization reaction by adding the water-soluble ethylenically unsaturated monomer for the second step to the polymerization reaction solution to agglomerate the primary particles, to give secondary particles having a median particle size (D) of from 200 to 500 ?m.

Abstract: The present invention relates to the modification of copolymers, in particular of grafted copolymers into comb copolymers. The modification comprises the steps (i) of controlled radical polymerization of a polymer or copolymer bearing a epoxide group at one end resulting from the initiation step, and (ii) a heating step of the polymer prepared under (i) and a copolymer bearing a functional group either in the backbone or attached to a side chain, which is able to react with the epxide group. The result is a comb copolymer with well controlled chain length of the grafted side arms expressed for example by a low polydispersity.

Abstract: A continuous process for producing high impact polystyrene comprising feeding at least one vinyl aromatic monomer, an elastomer, and a free radical initiator to a first linear flow reactor to form a reaction mixture, polymerizing the reaction mixture in said linear flow reactor to at least the phase inversion point of the mixture, and feeding the reaction mixture from the first linear flow reactor to a second reactor for post-inversion polymerization of the mixture. A method of producing an elastomer-reinforced polymer comprising inverting a reaction mixture comprising at least one vinyl aromatic monomer, an elastomer, and a free radical initiator in a plug flow reactor. A high impact polystyrene reactor system, comprising a linear flow reactor having an inlet and an outlet, and a continuously stirred tank reactor having an inlet in fluid communication with the linear flow reactor outlet and receiving an effluent from the linear flow reactor.

Abstract: The invention relates to selected polymer blends which can be used for production of films or sheets having reduced defects, and also to a process for preparation of the polymer blends.

Abstract: A crosslinkable elastomeric composition includes an elastomeric polymer containing carboxylic groups and an epoxidized liquid organic compound containing epoxide groups located internally on a molecule of the organic compound. The composition is crosslinkable substantially in an absence of additional crosslinking agents. A process for producing tyres for vehicle wheels including the composition, a tyre for vehicle wheels including the composition, a tyre for vehicles with a tread band including the composition, and a crosslinked elastomeric product obtained by crosslinking the composition are also disclosed.

Abstract: A grafted polymer, either polyolefin or polyester, containing monomers associated with sludge and varnish control as well as monomers associated with soot handling to provide a graft polymer exhibiting multiple performance attributes. Also described are methods for manufacturing these novel multiple-function graft polymers via solution and melt processes. Lubricating oil compositions containing these novel multiple-function polymers as an additive that display performance characteristics directed to good soot handling and sludge and varnish control as well as control of viscosity increase are described.

Abstract: The present invention relates to the production of a polymer powder with improved powder properties, and to its use as impact modifier for rigid polyvinyl chloride (PVC) applications. The impact modifier is composed of emulsion polymer particles which have a core-shell structure, where the shell is composed of a hard polymer and the core is composed of a soft, crosslinked rubber polymer.

Abstract: This invention discloses a process for synthesizing a hairy polymer particle which comprises the steps of (1) polymerizing a vinyl aromatic monomer by emulsion polymerization in an aqueous medium to produce core particles, (2) recovering the core particles from the aqueous medium, (3) dispersing the core particles in an organic solvent, (4) adding an organo-lithium compound to the dried core particles in the organic solvent to produce the hairless core initiator, and (5) utilizing the hairless core initiator to initiate the anionic polymerization of a conjugated diolefin monomer in an organic solvent to produce a solution of the hairy polymer particles. The hairy polymer nanoparticles can then be recovered from the organic solvent. These hairy polymer particles are comprised of (1) a core which is comprised of a polymer of a vinyl aromatic monomer and (2) hairs which are polymer chains of a conjugated diolefin monomer, wherein the hairs are covalently bonded to the core.

Abstract: The rubber modified polystyrene resin composition with high gloss and impact resistance according to the present invention is prepared by (i) polymerizing a solution consisting of about 80 to 95% by weight of styrene (A) and about 5 to 20% by weight of polybutadiene rubber (B) with a clay material at a temperature of about 90 to 150° C. in a first reactor so as to disperse at least two different sizes of polybutadiene rubber particles in the matrix of polystyrene, and (ii) inputting the resulting solution of the step (i) to a second reactor being kept at about 130 to 180° C. to terminate the polymerization.

Abstract: A propylene polymer composition having a melt flow rate (MFR) value from 3 to 30 g/10 min, comprising (percent by weight): A) 50-90% of one or more propylene copolymer(s) having a content of xylene-insoluble mojety at room temperature of not less than 85%, selected from the group consisting of propylene-ethylene random copolymers containing from 1 to 7%, of ethylene; propylene-C4-C8 ?-olefin copolymers containing 2-10% of the C4-C8 alpha-olefins; and propylene-ethylene-C4-C8 ?-olefin copolymers containing 0.5-5% of ethylene and 2-6% Of C4-C8 ?-olefins; and B) 10-50% of a copolymer of propylene containing from 8 to 40% of ethylene and optionally 1-10% of a C4-C8 alpha-olefin; the said MFR value (MFR (2)) being obtained by subjecting to degradation a precursor composition comprising the same components A) and B) in the above said proportions, but having the MFR value (MER (1)) from 0.1 to 5 g/10 min with a ratio MFR (2) to MFR (1) of from 1.5 to 20.

Abstract: Disclosed herein is a top anti-reflective coating polymer and its composition comprising the same represented by Formula 1 below: wherein R1 and R2 are independently, hydrogen, methyl or fluoromethyl; R3 and R4 are independently, a C1-10hydrocarbon or a C1-10 hydrocarbon in which the hydrogen atoms are wholly or partly replaced by fluorine atoms; and a, b, c, d and e represent the mole fraction of each monomer and are in the range between about 0.05 and about 0.9, such that the sum of a, b, c, d, and e equals one.

Abstract: There is provided a synthetic resin emulsion comprising polymer particles having a core/shell structure, wherein the shell comprises a copolymer of an unsaturated carboxylic acid and a hydrophilic comonomer, the core comprises a copolymer of a monomer mixture comprising a radically polymerizable main monomer and a radically polymerizable functional monomer, and the monomers constituting the monomer mixture are selected so that the glass transition point (Tg) of the copolymer produced by polymerization is ?20° C. or below, and the synthetic resin emulsion has been produced by adding the monomer mixture for core formation and a pH adjustor to an aqueous copolymer solution, which has not been neutralized, produced by polymerizing the unsaturated carboxylic acid and the hydrophilic comonomer in an aqueous medium, and allowing a polymerization reaction to proceed.

Abstract: Disclosed is a mass polymerized rubber-modified monovinylidene aromatic copolymer composition with an excellent balance of physical and mechanical properties especially low temperature impact, and methods for preparing such a composition.

Abstract: Process for preparing stable polymer concentrates, wherein acryloyldimethyltaurine and/or acryloyldimethyltaurate are free-radically polymerized with at least one further component in the presence of a polymerization medium, a higher-boiling solvent or solvent mixture is added to the resulting reaction product or reaction mixture, and the lower-boiling polymerization medium is removed, optionally under reduced pressure.

Abstract: A process for preparing a graft copolymers is provided comprising exposing a polymeric base material to a dose of ionizing radiation, and then contacting the irradiated base material with a microemulsion comprising at least one fluorostyrenic monomer, water and water-miscible solvent. The graft copolymer may be formed into a membrane, including ion exchange membranes.

Abstract: A polymer film substrate is irradiated with ions to make a large number of nano-sized through-holes and the substrate is further irradiated with an ionizing radiation so that a functional monomer is grafted or co-grafted onto a surface of the film and within the holes; in addition, the sulfonic acid group is introduced into the graft chains, thereby producing a polymer ion-exchange membrane that has high oxidation resistance, dimensional stability, electrical conductivity and methanol resistance, as well as an ion-exchange capacity controlled over a wide range.

Abstract: In a process for producing a polymer blend, at least one first monomer is polymerized in a first slurry phase reaction zone in the presence of a supported first catalyst to produce a thermoplastic first polymer having a crystallinity of at least 30%. At least part of said first polymer is then contacted with at least one second monomer different from said first monomer in a second solution phase reaction zone in the presence of a second catalyst and in the absence of polyenes under conditions to produce a second polymer having a crystallinity of less than 20%.

Abstract: A thermoplastic polyolefin having a melt flow rate of 20 dg/min or higher at 230° C. is produced in reactor without visbreaking. By controlling ratio of the weight average molecular weight of the xylene soluble fraction to the weight average molecular weight of the xylene insoluble fraction, a high melt flow thermoplastic polyolefin can be produced having a good balance of impact and stiffness, tensile elongation at break and gloss properties. Optionally, the ratio of the melt flow rate of the homopolymer phase to the melt flow rate of the total thermoplastic polyolefin can also be controlled. By compounding thermoplastic polyolefins according to the current invention with one or more modifiers, additional compositions can be produced having improved resistance to solvents.

Abstract: A fluororesin powder coating composition having high light resistance and being excellent in blocking resistance and smoothness of the coating film when coated, and a fluororesin powder to be used for a powder coating material, are presented. The fluororesin powder coating composition is made by using as the main material resin a composite fluorinated copolymer powder having a core/shell structure wherein core particles are made of a fluorinated copolymer and their surfaces are covered by e.g. a (meth)acrylate resin having a glass transition temperature higher than that of the core particles. The core/shell structure is formed by seed polymerization wherein fluorinated polymer particles are used as seeds.

Abstract: The invention relates to a novel, impact-resistant polymer based on PMMA.

Abstract: The present invention relates to a preparation method for acrylonitrile-butadiene-styrene resin by continuous bulk polymerization comprising the following steps of a) preparing a mixed solution of styrene monomers and acrylonitrile monomers by adding 5–10 weight % of the mixture of styrene monomers and acrylonitrile monomers to a reaction solvent; b) preparing a polymerization solution by dissolving butadiene rubber in the above mixed solution of styrene monomers and acrylonitrile monomers; c) polymerizing with a serial injection of the prepared polymerization solution and initiator in a grafting reactor; d) polymerizing the reaction solution of the above c) in a phase inversion reactor by adding 90–95 weight % of the total mixture of styrene monomers and acrylonitrile monomers thereto; and e) polymerizing further the reaction solution of the above step d) at 130–160° C. The resin prepared by the method of the present invention thus has excellent impact strength and gloss.

Abstract: The present invention relates to a polymerization process for the control of the microstructure of polymers and to novel copolymers. An embodiment of the present invention relates a process of polymerizing first and second monomers in the presence of a complex comprising at least one of the monomers. The presence of the complex modifies the relative reactivity, or cross propagation rate constants, of the monomers in copolymerization reactions. Embodiments of the present invention allow the synthesis of polymers with novel stereochemistry and monomer sequence distribution, for example, but not limited to, copolymers with at least one segment of alternating monomers, a controlled molecular weight and narrow molecular weight distribution, or a segment of high concentration of the first monomer.

Abstract: The present invention relates to a method for post-modification of a macroporous polymeric support comprising one or more unreacted double bonds, which method includes the steps of contacting the support with a liquid comprising a grafting compound; and initiating a free radical reaction in the mixture obtained, wherein the grafting compound is comprised of a double bond as a reactive group coupled to a linear or cyclic chain of carbon. The grafting compound can be illustrated with vinyl ethers and/or styrene and styrene derivatives.

Abstract: The present invention relates to a latex with modified surface chemistry, which may be obtained by carrying out a free-radical emulsion polymerization in the presence of at least one ethylenically unsaturated monomer or at least one polymer containing residual ethylenically unsaturated bonds, of at least one free-radical polymerization initiator, of at least one water-soluble and/or water-dispersible monoblock, diblock or triblock polymer comprising at its end an active group capable of forming a radical, chosen from dithioesters, xanthates, thioether-thiones and diothiocarbamates. The invention similarly relates to redispersible powders that may be obtained by drying the said latices.

Abstract: A process for the production of a graft copolymer comprises reacting an irradiated polymer in a reaction mixture comprising a first phase and a second phase. The first phase comprises a source of at least one non-water soluble monomer and the second phase comprises water and optionally, a water miscible organic solvent. The first and second phases are substantially immiscible and non-emusifiel. A high degree on monomer conversion is achieved.

Abstract: The invention relates to an impact-modified moulding composition which has particularly high impact resistance at low temperatures (?20° C., ?40° C.). This low-temperature impact resistance is achieved by using a silicone elastomer.

Abstract: The present invention relates to ABS thermoplastic resin and preparation thereof, and particularly to a process for preparing an ABS graft copolymer comprising the step of introducing to a) 40 to 80 weight parts of rubber latex comprising i) 10 to 50 weight parts of large diameter polybutadiene rubber latex having a particle diameter of 2500 to 3500 ?, gel contents of 60 to 80%, and a swelling index to 12 to 30, and ii) 50 to 90 weight parts of large diameter rubber latex having a particle diameter of 2500 to 3500 ?, gel contents of 81 to 97%, and a swelling index of 18 to 40, b) 20 to 60 weight parts of a monomer mixture of two or more kinds selected from a group consisting of aromatic vinyl compounds and vinyl cyanide compounds to prepare a graft copolymer, wherein 5 to 30 wt % of the monomer mixture is introduced as a batch and simultaneously 70 to 95 wt % of the monomer mixture is started to be continuously introduced in an emulsified state, and a thermoplastic resin composition using the same.

Abstract: The invention relates to an impact-modified molding composition which has particularly high impact resistance at low temperatures (?20° C., ?40° C.). This low-temperature impact resistance is achieved by using a silicone elastomer.

Abstract: An adhesive composition that includes a) an emulsion that includes a multi-stage polymer that includes a first stage polymer having a Tg from ?20° C. to 90° C. and including from about 0.5% by weight to about 3% by weight latent crosslinking monomer based on the first stage monomer weight, and a second stage polymer having a Tg from 40° C. to 140° C., the second stage polymer being different from the first stage polymer, b) formaldehyde-based crosslinking agent, and c) catalyst, the composition being capable of passing the DIN EN 204 Test Method.

Abstract: An adhesive composition, including a mixture of about 1 percent to about 35 percent by weight of chlorinated polymer, about 1 percent to about 35 percent by weight of a nitrile elastomer, a rubber-modified acrylonitrile copolymer, or mixtures thereof, about 25 percent to about 90 percent by weight of an alkyl acrylate or methacrylate monomer and about 0.01 to about 30 weight percent of a core shell impact modifier.

Abstract: The present invention relates to a method of preparing rubber-modified styrene copolymer resin with excellent transparency and impact resistance, specifically to a method of preparing transparent resin of rubber-modified styrene copolymer comprising graft-copolymerizing styrene monomer and (meth)acrylate monomer in the presence of block or random styrene-butadiene copolymer which has 30-50% of styrene skeleton content and 20-40 cp of 5% toluene solution viscosity at 25 iÉ. According to the method of the present invention, the transparent resin containing the rubber particles of a double structure comprising onion and core-shell structure can provide transparent resin of rubber-modified styrene copolymer resin with excellent transparency and impact resistance as well as good gloss.

Abstract: A process for preparing a graft copolymers is provided comprising exposing a polymeric base material to a dose of ionizing radiation, and then contacting the irradiated base material with a microemulsion comprising at least one fluorostyrenic monomer, water and water-miscible solvent. The graft copolymer may be formed into a membrane, including ion exchange membranes.

Abstract: An ethylene propylene rubber foam which comprises as the crude rubber, an ethylene propylene rubber having an iodine value of 35 to 45 and a Mooney viscosity ML1+4 at 100° C. of 20 to 50, and which has less compression set and is suitable as a material for a transfer member, a primary transfer member, a secondary transfer member, a cleaning member for image formation bodies, a bias member, a backup member, etc.; an electroconductive ethylene propylene rubber foam which comprises as the crude rubber, an ethylene propylene rubber having an iodine value of 35 to 45 and a Mooney viscosity ML1+4 at 100° C.

Abstract: A highly uniform vinyl compound polymer-cross-copolymerized olefin/styrene/diene copolymer excellent in processability, mechanical properties, high temperature properties, compatibility and transparency, and its composition and a process for its production, are provided. This copolymer is a crossed polymer obtained by cross-copolymerizing an olefin/styrene/diene copolymer having a styrene content of from 0.03 mol % to 96 mol %, a diene content of from 0.0001 mol % to 3 mol % and the rest being an olefin, with an olefin/aromatic vinyl compound copolymer.

Abstract: A fluorine-containing graft copolymer is made from a backbone of an olefin polymer material to which is graft polymerized (a) at least one gaseous fluorinated monomer such as vinylidene fluoride, (b) at least one fluorinated acrylic acid or ester, (c) a mixture of (a) and (b), or (d) a mixture of (a) and/or (b) and a non-fluorinated monomer such as methyl methacrylate. An organic peroxide or a polymeric peroxide is used as the initiator for the graft polymerization process. The graft copolymers have improved surface properties and oxygen barrier properties, and improved thermal stability.

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 an artificial pigment and a method of preparing the same, specifically, to an artificial pigment with excellent dry pick resistance and to a method of preparing the same. In order to accomplish the present invention, there is provided an artificial pigment of inverted core-shell structure comprising: a) a shell of butadiene polymer including: i) a seed of butadiene polymer having glass transition temperature of −10 to 50° C.; and ii) a seed covering of butadiene polymer having a glass transition temperature of −10 to 20° C.; and b) a core of styrene polymer having a glass transition temperature of 40 to 120° C. Also provided is method of preparing artificial pigment comprising: a) preparing a shell of butadiene polymer; and b) preparing a core of styrene polymer on the inner side of said shell of step a).

Abstract: Anionic electrodeposition coating compositions for forming matte films containing acrylic resin; alkoxysilyl group containing emulsified polymer produced by a multiple stage emulsion polymerization of unsaturated monomer in the presence of water and a emulsifier, wherein the unsaturated monomer containing alkoxysilyl group-containing unsaturated monomer is present in an amount of 5 to 40% by weight based on a total amount of all the unsaturated monomers used in the multiple stage emulsion polymerization; and crosslinking agent.

Abstract: The invention provides water-soluble or water-swellable copolymers obtainable by free-radical copolymerization of

Abstract: The invention describes a process for the preparation of a particulate polymer, said process comprising: i) forming an aqueous dispersion comprising a particulate polymer seed material and a first organic compound; ii) allowing said first organic compound to diffuse into said seed material to produce a pre-swollen seed material; iii) contacting said pre-swollen seed material in aqueous dispersion with said first organic compound and a second organic compound, preferably one which is soluble in said first organic compound; iv) allowing or causing said first and second organic compounds to pass into said pre-swollen seed material to produce an activated seed material; v) contacting said activated seed material with a monomer and effecting suspension polymerization thereof.

Abstract: The present invention is directed to an ethylene-vinyl acetate dispersion and a process for making the dispersion by polymerizing a monomer mixture having vinyl acetate and ethylene in a batch process, in the presence of a stabilizing system of polyvinyl alcohol and without added surfactants, to form an ethylene-vinyl acetate polymer dispersion. The copolymer dispersion has a solids level of greater than 65 percent by weight, and a viscosity of less than 5000 mPa·s when measured at 65 percent solids at 25° C. The dispersion can be dried to form a redispersible powder. Both the dispersion and powder are useful in adhesive and coating formulations.

Abstract: A foam profile prepared by a process comprising the steps of foaming a thermoplastic vulcanizate, where the thermoplastic vulcanizate is prepared by a process comprising the step of dynamically vulcanizing a rubber within a mixture that includes from about 15 to about 95 percent by weight of the rubber and from about 5 to about 85 percent by weight of a thermoplastic component based upon the total weight the rubber and thermoplastic component combined, where the thermoplastic component includes from about 65 to about 90 percent by weight of a conventional thermoplastic resin and from about 10 to about 35 percent by weight of a random propylene copolymer based upon the total weight of the thermoplastic component.

Abstract: A method of producing a non-crosslinked polymer particle having in a side chain thereof a succinimidoxycarbonyl group represented by the following structural formula (1): 1

Abstract: A process for producing a thermoplastic molding composition is disclosed. The process entails introducing a solid polymeric resin, optionally containing residual moisture, into an extruder, operating under conditions designed to melt the resin and charging water into the melt while in the extruder to yield wet, molten resin that contains water in an amount of at least about 2 percent. The wet, molten resin is then devolatilized to yield dry resin having water content not exceeding 0.3 percent. Molding compositions thus produced have improved properties. In a preferred embodiment, the process results in a molding composition that contains a fine dispersion of a discontinuous phase in a continuous polymeric phase.

Abstract: A process for forming certain aqueous polymeric dispersions including a first emulsion polymer having an average particle diameter of 150 to 3000 nanometers and a second emulsion polymer having an average particle diameter of 40 to 600 nanometers where at least the first emulsion polymer particles, when dry, contain at least one void is provided. Also provided are the aqueous polymeric dispersions made by the process and paper or paperboard coatings and paints including the aqueous polymeric dispersions.