Fine particle size low bulk density thermoplastic polymers

Details Fine particle size low bulk density thermoplastic polymers Fine particle size low bulk density thermoplastic polymers

C - Chemistry, Metallurgy

08

J

C08J 3/12 (2006.01) C08J 3/14 (2006.01)

Patent

CA 2307306

Fine particulate thermoplastic polymers [e.g., hydrophobically modified polyether-polyurethanes, polyacrylates, polyvinyl alcohol, polyether-polyols, polyacrylamide, aminoplast-polyethers and poly(acetal- or ketal-polyethers] having reduced bulk density, process of making same by dissolving the polymer and rapidly insolubilizing the polymer from the solution and process of using aqueous suspensions of such polymers as thickeners for aqueous systems.

On décrit des polymères thermoplastiques en fines particules (polyéther-polyuréthanes modifiés par hydrophobie, polyacrylates, polyalcool de vinyle, polyéther-polyols, polyacrylamide, polyéthers aminoplastes et poly(acétal ou cétal-polyéthers, par exemple) présentant une masse volumique apparente réduite. On décrit aussi un procédé de production desdites matières par dissolution du polymère et son insolubilisation rapide à partir de la solution. On décrit enfin un procédé qui met en oeuvre des suspensions aqueuses desdits polymères comme épaississants de systèmes aqueux.

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