Polyvinyl alcohol compounds for inhibition of ice growth

A - Human Necessities – 01 – N

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A01N 1/02 (2006.01) A01G 13/00 (2006.01) A01G 15/00 (2006.01) A01N 31/02 (2006.01) A01N 37/02 (2006.01) B01D 15/00 (2006.01) B60S 1/02 (2006.01) B64D 15/00 (2006.01) C09K 3/18 (2006.01) C09K 5/20 (2006.01) C10G 33/04 (2006.01) E01H 5/00 (2006.01)

Patent

CA 2345018

Polyvinyl alcohol and related compounds are provided that inhibit the freezing of water and water solutions. These synthetic compounds preferentially bind and inhibit ice nucleating surfaces in a manner similar to natural antifreeze proteins. The resulting inhibition allows water and water solutions to supercool without ice formation to temperatures below the thermodynamic freezing point. The freezing inhibition occurs at concentrations as small as one part per million, although concentrations up to one part per hundred are preferred. These polyvinyl alcohol additives are very useful for enhancing the performance of antifreeze formulations, biological cryopreservation solutions, and for preventing frost damage to plants and other industrial products and processes.

L'invention concerne des composés de polyalcool de vinyle et des composés associés inhibant la congélation de l'eau et de solutions aqueuses. De préférence, ces composés synthétiques inhibent et se lient, de façon similaire aux protéines antigel naturelles, à des surfaces ayant des propriétés de nucléation. Grâce à l'inhibition qui en résulte, l'eau et les solutions aqueuses peuvent surfondre à des températures inférieures au point de congélation thermodynamique, sans provoquer de formation de glace. L'inhibition de la congélation a lieu à des concentrations pouvant atteindre une partie par million, bien que des concentrations s'élevant à une partie par centaine soit préférables. Ces additifs de polyalcool de vinyle sont particulièrement utiles pour améliorer la performance de formulations antigel, de solutions biologiques de cryopréservation et pour prévenir les dégâts occasionnés par le gel sur des plantes et sur d'autres produits et procédés industriels.

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