Abstract: This invention relates to nickel catalysts with alkali ions for homopolymerization and copolymerization.

Abstract: This invention relates to nickel catalysts with alkali ions for homopolymerization and copolymerization.

Abstract: The disclosure relates to rubber latex formed from any of: branched block copolymers derived from alkenyl aromatic hydrocarbon—1,3-diene monomer system, and branched polyisoprene homopolymers derived from isoprene. The polymers in embodiments are obtained by polymerization in the presence of an anionic initiator; at a temperature from 0° C. to 100° C.; followed by coupling with a multifunctional coupling agent of formula (R1O)3Si—Y—Si(OR2)3, wherein R1 and R2 are independently C1-C6 alkyl groups; and Y is a C2-C8 alkylene group. The polymers are obtained as rubber cements having high solids content and low zero shear viscosities. The rubber cements are valuable for making latices for further applications.

Abstract: A biaxially-oriented film for thermoforming is disclosed including at least 75% by weight polyethylene and at least 95% by weight polyolefins, based on the total mass of the film. The polyethylene has an elongation at break of at least 7 in the stress-strain diagram, wherein the stress-strain diagram is measured at a temperature of 10° C. below the melting point of the polyethylene and the melting point is determined by differential scanning calorimetry using a heating rate of 10° C. per minute. A process for producing such films and to the use thereof are disclosed. A process for producing shaped bodies from such films and to the shaped bodies themselves are disclosed.

Abstract: A terpolymer of ethylene, of 1,3-butadiene and of an aromatic ?-monoolefin is provided. The terpolymer contains more than 60 mol %, preferably at least 70 mol %, and preferably at most 90 mol % of ethylene units, at most 10 mol % of aromatic ?-monoolefin units and 1,2-cyclohexanediyl units. Such a diene terpolymer rich in ethylene units has the advantage of exhibiting a reduced, or even zero, crystallinity.

Abstract: Supported chromium catalysts containing a solid oxide and 0.1 to 15 wt. % chromium, in which the solid oxide or the supported chromium catalyst has a particle size span from 0.5 to 1.4, less than 3 wt. % has a particle size greater than 100 ?m, and less than 10 wt. % has a particle size less than 10 ?m, can be contacted with an olefin monomer in a loop slurry reactor to produce an olefin polymer. Representative ethylene-based polymers produced using the chromium catalysts have a HLMI of 4 to 70 g/10 min, a density from 0.93 to 0.96 g/cm3, from 150 to 680 ppm solid oxide (such as silica), from 1.5 to 6.8 ppm chromium, and a film gel count of less than 15 catalyst particle gels per ft2 of 25 micron thick film and/or a gel count of less than or equal to 50 catalyst particles of greater than 100 ?m per five grams of the ethylene polymer.

Abstract: A chloroprene-unsaturated nitrile copolymer having 3 to 20% by mass of a structural unit derived from an unsaturated nitrile monomer, in which the chloroprene-unsaturated nitrile copolymer has a peak at 5.80 to 6.00 ppm in a 1H-NMR spectrum as measured in a deuterochloroform solvent, and a ratio (A/B) of a peak area (A) at 5.80 to 6.00 ppm and a peak area (B) at 4.05 to 6.20 ppm is 0.6/100 to 1.1/100.

Abstract: Provided are a hybrid supported catalyst which includes two or more kinds of transition metal compounds having the following Chemical Formulas 1 and 2, thereby preparing a polyolefin, particularly, a high-density polyethylene having a molecular structure which is optimized to improve tensile strength of a chlorinated polyolefin compound, and a method of preparing a polyolefin using the same: wherein all the variables are described herein.

Abstract: Disclosed are an aging-resistant rubber composition and methods for processing and use thereof. The rubber composition includes a rubber matrix and compounding components. In parts by weight, every 100 parts of rubber matrix comprise 50-99 parts of a halogenated butyl rubber, 0-50 parts of a highly branched polyethylene P1, and 0-50 parts of P2 obtained by the polarization modification of said highly branched polyethylene P1. The sum of P1 and P2 in parts by weight is 1-50 parts; and the compounding components comprise a vulcanization system.

Abstract: Refractive index matching (RIM) formulations, their use for mounting biological specimens (e.g., cells and tissues) to a substrate, and methods of visualizing biological specimens embedded in RIM formulations are described.

Abstract: The invention provides a light-stimuli responsive coordination polymer, and preparation method and use thereof. The coordination polymer has a chemical formula of [Zn(tkpvb) (Fb)2]n1, wherein Fb represents p-fluorobenzoate, tkpvb represents 1,2,4,5-tetrakis((E)-2-(4-pyridyl)vinyl)benzene, and n=3000-60000; and crystallographic parameters of: (1) crystal system: monoclinic system; (2) space group: C2/c; (3) a=28.577(3)?, b=7.4084(6) ?, c=22.612(3) ?, ?=126.771(2)°, and V=3834.8(7) ?3; (4) Z=4; and (5) F(000)=1720, R1=0.0440, wR2=0.1042, and GOF=1.047. The method is simple, and has mild reaction conditions, and fast light conversion rate. The means of light-stimuli responsiveness are non-contact and non-damage type, the volume adjustment is highly accurate, and the whole adjustment process does not require any chemical reagents, and is safe and reliable. Photoactuators can complete a variety of behaviors under the irradiation of ultraviolet light having a wavelength of 365 nm.

Abstract: Described herein are polymerization catalysts having a structure according to formula (1): wherein is a diimine ligand, A? is a counter anion, and R2 is a fluorinated alkane, alkene or alkyne, a fluorinated aromatic, a fluorinated cycloalkane or cylcoalkene, a fluorinated heteroaromatic, or a fluorinated heterocyclic. Also described herein are polymers having a terminus having a structure according to Formula (3): wherein R2 is a fluorinated alkane, alkene or alkyne, a fluorinated aromatic, a fluorinated cycloalkane or cylcoalkene, a fluorinated heteroaromatic, or a fluorinated heterocyclic.

Abstract: Reactor systems, reactor coolant systems, and associated processes for polymerizing polyolefins are described. The reactor systems generally include a reactor pipe and a coolant system, in which the coolant system includes a jacket pipe surrounding at least a portion of the reactor pipe to form an annulus therebetween, at least one spacer coupling the jacket to the reactor pipe, and a coolant which flows through the annulus to remove heat from the reactor pipe. At least one of the external surface of the reactor pipe, the internal surface of the jacket, and at least one spacer, are independently modified, for example by polishing, coating, or reshaping, to reduce the fluid resistance of the coolant flow through the annulus.

Abstract: A polymer capable of securing pattern uniformity in a photoresist pattern, the polymer containing a photoacid generator by including a structure unit represented by Chemical Formula 1a; and a structure unit represented by Chemical Formula 1b as shown in the specification.

Abstract: A method of recovering a solvent including: supplying polymerization reactants including one or more monomers and a solvent to a reactor to obtain a polymer solution; supplying a stream including the polymer solution to a separator to separate an upper discharge stream including the solvent, wherein the solvent is in a gaseous phase, and a lower discharge stream including the polymer solution; heating a divergence stream including a part of the lower discharge stream from the separator by a heating device and refluxing the divergence stream to the separator; supplying a residue stream including a remainder of the lower discharge stream from the separator to a steam stripping process unit; and adjusting a vapor mass fraction of the divergence stream which is refluxed to the separator with a pressure adjustment valve after being heated by the heating device.

Abstract: A method of preparing a carboxylic acid-modified nitrile-based copolymer latex is provided. The method of preparing a carboxylic acid-modified nitrile-based copolymer later includes emulsion-polymerizing a monomer mixture including a conjugated diene-based monomer, an ethylenically unsaturated nitrile-based monomer, and an ethylenically unsaturated acid monomer in the presence of a cross-linking agent including glyoxal.

Abstract: An ion exchange membrane containing a fluorinated polymer, wherein in a case where by Raman spectroscopy, polarized light orthogonal to the thickness direction of the ion exchange membrane is irradiated to obtain a spectrum chart, whereby the ratio of the peak area a2 of Raman shift 680 to 760 cm?1 to the peak area al of Raman shift 1,025 to 1,095 cm?1 is taken as A1, and by Raman spectroscopy, to a cross section in the thickness direction of the ion exchange membrane, polarized light parallel with the thickness direction is irradiated to obtain a spectrum chart, whereby the ratio of the peak area b2 of Raman shift 920 to 1,025 cm?1 to the peak area b1 of Raman shift 1,025 to 1,095 cm?1 is taken as B1, B1/A1 is at least 1.05.

Abstract: A resin composition including: at least one resin ingredient selected from the group made of a resin (A) having a side chain (a) containing a hydrogen-bonding cross-linking moiety with a carbonyl-containing group and/or a nitrogen-containing heterocycle and having a glass transition point of 25° C. or lower, and a resin (B) containing a hydrogen-bonding cross-linking moiety and a covalent-bonding cross-linking moiety in a side chain and having a glass transition point of 25° C. or lower, wherein both the resin (A) and the resin (B) are a reaction product of a cross-linking agent with a maleic anhydride-modified thermoplastic resin having a melting point of 68° C. to 134° C. and a maleation rate of 0.5 to 2.5% by mass.

Abstract: A method for monitoring polymerization processes can include reacting by polymerization a feedstock in the presence of a catalyst in a reactor to produce an effluent comprising a polymer and a solvent; measuring a density of the effluent; and calculating a monomer conversion rate and/or a polymerization rate for the polymerization based on the density of the effluent. A system for monitoring polymerization processes can include a reactor containing an effluent comprising a solvent, a polymer, and a monomer; a flash vessel fluidly coupled to the reactor to receive the effluent from the reactor; and an inline density meter fluidly coupled to the reactor, placed between the reactor and the flash vessel, and configured to measure a density of the effluent.

Abstract: A vinyl-containing copolymer is copolymerized from (a) first compound, (b) second compound, and (c) third compound. (a) First compound is an aromatic compound having a single vinyl group. (b) Second compound is polybutadiene or polybutadiene-styrene having side vinyl groups. (c) Third compound is an acrylate compound. The vinyl-containing copolymer includes 0.003 mol/g to 0.010 mol/g of benzene ring, 0.0005 mol/g to 0.008 mol/g of vinyl group, and 1.2*10?5 mol/g to 2.4*10?4 mol/g of ester group.