Biocidal composition which is an aqueous solution of...

C - Chemistry – Metallurgy – 07 – C

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C07C 229/00 (2006.01) A01N 37/44 (2006.01) A01N 37/50 (2006.01) C07C 229/22 (2006.01)

Patent

CA 2409052

A high purity, water-white, clear, light stable, non-toxic, formaldehyde-free composition for inhibiting growth in a substance requiring microbial inhibition comprising about 40-60 % by weight of an aqueous solution of hydroxymethylaminoacetate in the form of its alkali metal salt which is formed by the reaction of a salt of glycine, with formaldehyde, in an aqueous medium, at a pH of about 10.5-12.5, characterized by carrying out the reaction at a molar ratio of glycine to formaldehyde sufficient to maintain a molar excess of glycine in the medium and to leave a predetermined amount of residual glycine present in the composition at the conclusion of the reaction, and to preclude the presence of any detectable free formaldehyde as methylene diol in said composition.

L'invention concerne une composition exempte de formaldéhyde, non toxique, stable à la lumière, claire, incolore et de grande pureté, destinée à inhiber la croissance dans une substance nécessitant une inhibition microbienne. Cette composition comprend environ 40 à 60 % en poids d'une solution aqueuse d'hydroxyméthylaminoacétate sous la forme de son sel de métal alcalin, formé par la réaction d'un sel de glycine avec du formaldéhyde dans un milieu aqueux, dont le pH est d'environ 10.5-12.5. L'invention est caractérisée en ce que la réaction est obtenue avec un rapport molaire glycine/formaldéhyde suffisant pour maintenir un excès molaire de glycine dans le milieu utilisé, pour laisser une quantité prédéterminée de glycine résiduelle dans la composition à la fin de la réaction, et pour éviter la présence de tout formaldéhyde libre détectable, tel que le diol de méthylène, dans ladite composition.

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