Patent ID: 9732174
Date: 2017-08-15
CPC Classifications: B01J,C08F

Claim:
1. A process for preparing a polymer product, the process comprising: i) feeding an aqueous mixture comprising a monoethylenically unsaturated monomer or a mixture of monoethylenically unsaturated monomers into a first reactor through at least one inlet, wherein the first reactor comprises a positive displacement pump; ii) partially polymerising the monomer or monomers and transferring, with the positive displacement pump, the polymerising monomer or mixture of monomers from the inlet to an outlet of the first reactor; iii) flowing the partially polymerised product out of the outlet, in which no more than 60% by weight of the monomer or mixture of monomers has been polymerised in the partially polymerised product as it exits the outlet of first reactor, and transferring it to a further reactor, in which the further reactor has a further reactor inlet and a further reactor outlet; iv) continuing the polymerisation in the further reactor and removing a polymer product from the outlet of the further reactor, wherein the one or more monoethylenically unsaturated monomers are selected from the group consisting of acrylamide, methacrylamide, N-vinyl pyrrolidone, 2-hydroxy ethyl acrylate, acrylic acid, a salt of acrylic acid, methacrylic acid, a salt of methacrylic acid, itaconic acid, a salt of itaconic acid, maleic acid, a salt of maleic acid, 2-acrylamido-2-propane sulphonic acid, a salt of 2-acrylamide-2-propane sulfonic acid, vinyl sulphonic acid, a salt of vinyl sulphonic acid, allyl sulphonic acid, a salt of allyl sulphonic acid, dimethyl amino ethyl acrylate, an acid salt of dimethyl amino ethyl acrylate, a quaternary ammonium salt of dimethyl amino ethyl acrylate, dimethyl amino ethyl methacrylate, an acid salt of dimethyl amino ethyl methacrylate, a quaternary ammonium salt of dimethyl amino ethyl methacrylate, dimethyl amino propyl acrylamide, an acid salt of dimethyl amino propyl acrylamide, a quaternary ammonium salt of dimethyl amino propyl acrylamide, dimethyl amino propyl methacrylamide, an acid salt of dimethyl amino propyl methacrylamide, a quaternary ammonium salt of dimethyl amino propyl methacrylamide, and a combination thereof.