Vinyl alcohol-n-vinyl amine copolymer and its preparation...

C - Chemistry – Metallurgy – 08 – F

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C08F 8/12 (2006.01) C08F 216/06 (2006.01) C08F 226/02 (2006.01)

Patent

CA 2596658

A process for manufacturing a highly water-soluble vinyl alcohol-N-vinyl amine copolymer with a degree of hydrolysis higher than 93%, comprising a hydrolysis reaction of a vinyl alcohol-N-vinyl formamide copolymer with an alkaline metal hydroxide in methanol characterized in that the process is carried out with more than 1.5 mol of the alkaline metal hydroxide per mol of N-vinyl formamide units and without addition of water. A higher water soluble vinyl alcohol-N- vinyl amine copolymer obtained by this process and the use thereof.

L~invention concerne un procédé de fabrication d~un coplymère hautement hydrosoluble d'alcool vinylique et de N-vinylamine, avec un degré d~hydrolyse supérieur à 93 %, impliquant une réaction d~hydrolyse d~un copolymère d~alcool vinylique et de N-vinylformamide avec un hydroxyde de métal alcalin, dans du méthanol. Le procédé est caractérisé en ce qu'il est réalisé avec plus de 1,5 moles d~hydroxyde de métal alcalin par mole de motifs N-vinylformamide, sans addition d'eau. L~invention concerne également un copolymère d~alcool vinylique et de N-vinylamine de solubilité plus élevée dans l~eau obtenu par le biais du présent procédé, ainsi que les utilisations dudit copolymère.

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