Temperature sensitive polymers and water-dispersible...

C - Chemistry – Metallurgy – 08 – F

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Details

C08F 8/32 (2006.01) A61L 15/24 (2006.01) A61L 15/62 (2006.01) C08F 20/60 (2006.01)

Patent

CA 2274679

The present invention is directed to a novel process of making N-isopropyl acrylamide (NiPAm) polymers based upon the reaction of poly(acrylic acid) and N-isopropylamine. The disclosed method of the present invention uses polyacrylic acid as a starting material to synthesize NiPAm polymers. In one embodiment, the present invention discloses a condensation reaction of an intermediate salt to form homopolymers, copolymers and terpolymers of N- isopropyl acrylamide (NiPAm) with acrylic acid and/or alkyl acrylates in a molten state, which is adaptable to a continuous reactive extrusion process. Binder compositions, water-dispersible products and thermoformable articles containing the NiPAm polymers are also disclosed.

La présente invention concerne un nouveau procédé de fabrication de polymères N-isopropyl-acrylamide (NiPAm) à partir de la réaction d'un acide polyacrylique et d'une N-isopropylamine. Selon le procédé de la présente invention, on utilise l'acide polyacrylique comme matière première dans la synthèse des polymères NiPAm. Selon un mode de réalisation, la présente invention se rapporte à une réaction de condensation d'un sel intermédiaire qui permet de former des homopolymères, des copolymères et des terpolymères de N-isopropyl-acrylamide (NiPAm) avec l'acide acrylique et/ou les acrylates d'alkyle à l'état fondu, laquelle réaction peut être adaptée à un processus d'extrusion par réaction en continu. L'invention concerne enfin des compositions liantes, des produits hydrodispersables et des articles thermoformables contenant ces polymères NiPAm.

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