Process for the preparation of very low haze and color stable styrenic polymers by anionic polymerization wherein the obtained terminated polymer solution is passed through a first filter, fed to a dispersing device to which water is added, fed to a buffer vessel and then is impregnated in a static mixer by addition of further water, carbon dioxide and one or more stabilizers.

A process for copolymerizing ethylene and at least one C3 to C8 alpha olefin to obtain an ethylene-C3 to C8 alpha olefin copolymer, the process comprising a) copolymerizing ethylene and at least one C3 to C8 alpha olefin in a solvent in a solution polymerization reactor to obtain an intermediate polymer solution, b) discharging an effluent stream from the intermediate polymer solution into a heat exchanger, c) setting the temperature of the effluent stream in the heat exchanger to obtain a heated effluent stream, d) feeding the heated effluent stream to a flash separation, e) separating at least a part of the ethylene-C3 to C8 alpha olefin copolymer in the flash separation, characterized by feeding an inert hydrocarbon fulfilling 90 C.<T(BP)<130 C. to the solution polymerization reactor; and/or accumulating an inert hydrocarbon fulfilling 90 C.<T(BP)<130 C. during the polymerization reaction; and/or feeding an inert hydrocarbon fulfilling 90 C.<T(BP)<130 C. to the discharged effluent stream of step b).

A method for producing a polymer solution including a methacrylate copolymer having a weight average molecular weight of not less than 100,000, a weight average molecular weight/number average molecular weight of 1.01 to 1.8 and a glass transition temperature of not more than 40 C. and including methyl methacrylate units and alkyl (meth)acrylate units containing a C10-36 alkyl group, and a first solvent having a boiling point of not less than 200 C., through steps including a step (I) of preparing the methacrylate copolymer by polymerizing monomers in a second solvent having a boiling point of below 200 C., and a step (II) of mixing the solution from the step (I) which includes the methacrylate copolymer and the second solvent, with the first solvent, and removing the second solvent to raise the content of the first solvent to not less than 10 mass % of the polymer solution.

Residual hydrogenation catalyst produced from reduction of nitrile rubber is recovered by a chelation step using a chelating agent and a series of extraction using semi-coagulation with polar solvents and an optional washing steps for the separation of catalyst-chelating agent complex from hydrogenated nitrile rubber solution. The chelating agent is selected from xanthate, dithiocarbamate, and trithiocarbonate compounds.

Residual hydrogenation catalyst produced from reduction of nitrile rubber is recovered by a chelation step using a chelating agent and a series of extraction using semi-coagulation with polar solvents and an optional washing steps for the separation of catalyst-chelating agent complex from hydrogenated nitrile rubber solution. The chelating agent is selected from xanthate, dithiocarbamate, and trithiocarbonate compounds.

The nano-fibre derivative method includes polymerization of 3-methoxthiophene (MOT) monomer on Poly(acrylonitrile co-itaconic acid) matrix and by use of electro-spinning of the produced nano-particulate.

The nano-fibre derivative method includes polymerization of 3-methoxthiophene (MOT) monomer on Poly(acrylonitrile co-itaconic acid) matrix and by use of electro-spinning of the produced nano-particulate.

Provided is a method for producing a polymer for an electronic material having a low content of metal ion impurities and a polymer for an electronic material obtained by such method. The method for producing a polymer for an electronic material according to the present invention comprises a polymerization step of obtaining a polymer by polymerizing a monomer(s) and a purification step of adding a strong acid having 0 or less pKa to the polymer solution and subsequently performing an ion exchange treatment to reduce the concentration of the metal ion impurities.

Provided is a method for producing a polymer for an electronic material having a low content of metal ion impurities and a polymer for an electronic material obtained by such method. The method for producing a polymer for an electronic material according to the present invention comprises a polymerization step of obtaining a polymer by polymerizing a monomer(s) and a purification step of adding a strong acid having 0 or less pKa to the polymer solution and subsequently performing an ion exchange treatment to reduce the concentration of the metal ion impurities.

A method for producing an aqueous dispersion of purified polytetrafluoroethylene, the method including: removing or reducing a compound represented by Formula (1) or (2) below from an aqueous dispersion of polytetrafluoroethylene obtained using a hydrocarbon surfactant: Formula (1): (H(CF.sub.2).sub.mCOO).sub.pM.sup.1; or Formula (2): (H(CF.sub.2).sub.nSO.sub.3).sub.qM.sup.2.

Also disclosed is a composition containing polytetrafluoroethylene substantially free from a compound represented by Formula (3) below and a molded body including the composition: Formula (3): (H(CF.sub.2).sub.8SO.sub.3).sub.qM.sup.2.