The present invention relates to a process for the production of copolymers comprising: (i) forming a reaction mixture comprising an elastomer and a vinyl aromatic compound; (ii) introducing the reaction mixture to a reaction vessel; and (iii) performing a polymerisation reaction wherein steps (i)-(iii) are performed in that order to obtain a copolymer comprising: (a) a phase comprising a reaction product of the elastomer with the vinyl aromatic compound; and (b) a phase comprising a reaction product of the vinyl aromatic compound wherein a sample of the reactor contents is obtained during step (iii) to determine of the formed copolymer: the content of phase (b); and/or.circle-solid.the molecular weight of phase (b) wherein the determination of the content of phase (b) in the formed copolymer and the molecular weight of phase (b) is performed by a method comprising isolation of phase (b) from the sample of the formed copolymer and subjecting the obtained phase (b) to molecular analysis. Such process allows for the determination of the content N of the phase (b) and of the molecular weight thereof in a quick and efficient manner, allowing for adjustment of process parameters such that the production of products that not correspond to the desired product quality is minimised.

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.

Methods according to the present invention decolorize a polymer by mixing a solution of the polymer with a photocatalyst and exposing the mixture to ultraviolet light; by way of non-limiting example, the polymer may be a star polymer and the photocatalyst may be titanium dioxide. Methods according to the present invention also utilize a metal scavenger, in some embodiments a solid-phase metal scavenger, to remove a metal catalyst from a polymer solution; by way of non-limiting example, the metal catalyst may be a tin catalyst. The decolorization methods and the catalyst removal methods of the present invention may be practiced separately, sequentially in any order, or simultaneously.

The present disclosure relates to a purification method of a polymerization solvent used in and recovered from the preparation of a polyolefin resin, which can effectively remove impurities, in particular polyolefin wax, from the polymerization solvent to obtain a purified polymerization solvent with high purity, and can improve energy efficiency.

The present invention relates to a solvent recovery apparatus and a solvent recovery method, and the solvent recovery apparatus and method according to the present application can reduce the used amount of steam in a synthetic rubber production process, and can reduce the used amount of energy by recovering the waste heat discarded through a condenser.

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.

The present invention relates to a process for manufacturing an object made of biocompatible hydrogel by molding a polymer solution in a mold made of a particular material, said process comprising the following steps: (i) preparation of a polymer solution by dissolving a copolymer of acrylonitrile and of an olefinically unsaturated co-monomer bearing anionic groups in an aprotic solvent, optionally in the presence of a nonsolvent, (ii) shaping and the start of gelation of the polymer solution obtained at the end of step (i) in a mold consisting of a material containing said nonsolvent or of a material permeable to said nonsolvent, (iii) immersion of the object undergoing gelation resulting from step (ii) in a nonsolvent. The present invention also relates to the objects made of biocompatible hydrogel resulting from this process such as, for example, intracorneal lenses (or lenticules) implantable in the cornea or any other implants usable in ophthalmology.

The present invention relates to a process for manufacturing an object made of biocompatible hydrogel by molding a polymer solution in a mold made of a particular material, said process comprising the following steps: (i) preparation of a polymer solution by dissolving a copolymer of acrylonitrile and of an olefinically unsaturated co-monomer bearing anionic groups in an aprotic solvent, optionally in the presence of a nonsolvent, (ii) shaping and the start of gelation of the polymer solution obtained at the end of step (i) in a mold consisting of a material containing said nonsolvent or of a material permeable to said nonsolvent, (iii) immersion of the object undergoing gelation resulting from step (ii) in a nonsolvent. The present invention also relates to the objects made of biocompatible hydrogel resulting from this process such as, for example, intracorneal lenses (or lenticules) implantable in the cornea or any other implants usable in ophthalmology.