Aqueous superabsorbent polymer and methods of use

C - Chemistry – Metallurgy – 08 – F

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C08F 8/00 (2006.01) A61L 15/00 (2006.01) C08F 8/44 (2006.01)

Patent

CA 2382145

The present invention relates to a crosslinked aqueous solution polymer composition consisting of about 15 wt-% to about 50 wt-% of at least one water soluble monomer, preferably an alpha, beta-ethylenically unsaturated carboxylic acid monomer and a crosslinking agent. The polymer solution is sufficiently low enough in viscosity such that it can be applied in aqueous form, yet after crosslinking possesses a fast rate of acquisition and is high absorption capacity. The invention also relates to new methods of enhancing the absorbency of various articles, increasing the humectancy and/or absorbency of a fiber or fibrous matrix, improving the water retention of soil and other agricultural methods, and increasing the open time of cement by incorporating or applying an aqueous superabsorbent polymer composition.

La présente invention concerne une composition de polymères en solution aqueuse réticulée comprenant 15 à 50 % environ en poids d'au moins un monomère soluble dans l'eau, de préférence un monomère d'acide carboxylique insaturé alpha, bêta-éthylénique et un agent de réticulation. La solution de polymères possède une viscosité suffisamment faible pour qu'on puisse l'appliquer sous forme aqueuse, tout en possédant, après réticulation, un taux d'acquisition rapide et une capacité d'absorption élevée. L'invention concerne également de nouveaux procédés d'amélioration de la capacité d'absorption de différents articles, y compris le pouvoir humectant et/ou absorbant d'une fibre ou d'une matrice fibreuse ; d'amélioration du pouvoir de rétention d'eau du sol et d'autres méthodes agricoles ; et d'amélioration du temps d'ouverture du béton par incorporation ou application d'une composition de polymères surabsorbante aqueuse.

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