Biostable water-borne paints and processes for their...

C - Chemistry – Metallurgy – 09 – D

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C09D 105/00 (2006.01) C09D 5/14 (2006.01) C09D 7/00 (2006.01) C09D 101/00 (2006.01)

Patent

CA 2244014

Water-borne paints containing reduced molecular weight polysaccharide derivatives that are resistant to enzyme hydrolysis. The water-borne paints are biostable, retaining at least about 80% of their initial viscosity 24 hours after they are inoculated with polysaccharide hydrolysis enzyme. A process for making the biostable water-borne paints has the steps: a) treating precursor polysaccharide derivative with polysaccharide hydrolysis enzyme in aqueous medium for a time sufficient to obtain reduced molecular weight polysaccharide derivative; and b) mixing the reduced molecular weight polysaccharide derivative with an effective amount of at least one other water-borne paint ingredient to obtain a water-borne paint.

Divulgation de peintures à l'eau contenant des dérivés de polyosides de poids moléculaire réduit, qui résistent à l'hydrolyse enzymatique. Ces peintures à l'eau sont biostables, conservant au moins environ 80 % de leur viscosité initiale 24 heures après avoir été inoculées avec un enzyme hydrolysant les polyosides. On divulgue aussi un procédé pour fabriquer ces peintures à l'eau biostables, qui comprend : a) le traitement du dérivé de polyosides précurseur à l'aide d'un enzyme hydrolysant les polyosides, en milieu aqueux, pendant une durée suffisante pour obtenir la réduction du poids moléculaire du dérivé de polyosides; b) le mélange de ce dérivé de polyosides de poids moléculaire réduit avec une quantité efficace d'au moins un autre ingrédient pour peinture à l'eau, afin de produire une peinture à l'eau.

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