US 12,103,858 B2
Extrusion process for the preparation of alkali metal carbonate, bicarbonate and sesquicarbonate formulations using a dissolved functionalizing agent
Jorge Alejandro Kabbabe Malave, Bourg-la-Reine (FR); Thibaud Detoisien, Dombasle-sur-Meurthe (FR); Karine Cavalier, Uccle (BE); and Eric Pierre Dubois, Wasseiges (BE)
Assigned to Solvay SA, Brussels (BE)
Appl. No. 16/093,116
Filed by Solvay SA, Brussels (BE)
PCT Filed Apr. 13, 2017, PCT No. PCT/EP2017/059011
§ 371(c)(1), (2) Date Oct. 11, 2018,
PCT Pub. No. WO2017/178625, PCT Pub. Date Oct. 19, 2017.
Claims priority of application No. 16165118 (EP), filed on Apr. 13, 2016.
Prior Publication US 2021/0214238 A1, Jul. 15, 2021
Int. Cl. C01D 7/38 (2006.01); B01J 2/20 (2006.01); C08J 3/03 (2006.01); C08J 3/12 (2006.01); C08J 3/21 (2006.01); C08K 3/26 (2006.01); C11D 3/10 (2006.01); C11D 3/22 (2006.01); C11D 3/37 (2006.01); C11D 11/00 (2006.01); B01F 23/50 (2022.01)
CPC C01D 7/38 (2013.01) [B01J 2/20 (2013.01); C08J 3/03 (2013.01); C08J 3/12 (2013.01); C08J 3/212 (2013.01); C08K 3/26 (2013.01); C11D 3/10 (2013.01); C11D 3/222 (2013.01); C11D 3/37 (2013.01); C11D 11/00 (2013.01); B01F 23/56 (2022.01); C01P 2004/54 (2013.01); C01P 2004/61 (2013.01); C01P 2006/90 (2013.01); C08J 2329/04 (2013.01); C08J 2389/00 (2013.01); C08K 2003/262 (2013.01)] 6 Claims
 
1. A process for preparing a formulation for foaming plastics, the formulation consisting of an alkali metal salt, a functionalizing agent, and optionally water, wherein the alkali metal salt is selected from the group consisting of alkali metal bicarbonate salts, alkali metal sesquicarbonate salts and combinations thereof, wherein said process comprises:
(a) dissolving the functionalizing agent in water to obtain a solution, the solution consisting of water and the functionalizing agent in an amount of at least 20 g per 100 g water;
(b) mixing the alkali metal salt with the solution in a weight ratio so that a paste-like composition consisting of the alkali metal salt, the functionalizing agent and water, is formed;
(c) extruding the paste-like composition to obtain a powder, filaments or granules consisting of water, the alkali metal salt and the functionalizing agent, wherein the alkali metal salt is present in the paste-like composition in an amount of at least 75% by weight; and
(d) at least partially removing the water from the powder, filaments or granules to obtain a powder, filaments or granules consisting of the alkali metal salt, the functionalizing agent, and optionally water,
wherein the functionalizing agent is a polymer selected from the group consisting of polyvinylalcohol (PVOH), a polyglycol, polyethylene glycol (PEG), a polysaccharide, polyacrylic acid (PAA), poly(acrylic acid-co-maleic acid), polyethylenimine, polyvinylpyrrolidone (PVP), N-(2-Hydroxypropyl) methacrylamide (HPMA), poly-galactomannane, and combinations thereof.