Environmentally friendly aqueous architectural coating...

C - Chemistry – Metallurgy – 09 – D

Patent

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C09D 151/08 (2006.01) C08F 251/00 (2006.01) C09D 151/02 (2006.01)

Patent

CA 2326780

An environmentally friendly stable aqueous optionally structured water- resistant architectural coating composition (especially a paint) containing a film-forming binder polymer composed of a starch modified by the presence of carboxylic acid or inorganic carboxylate groups and bonded (probably grafted) to chains of copolymerised mono-ethylenically unsaturated monomers (e.g. "acrylic", "vinyl" or "styrenic" copolymers) permitting a stable aqueous dispersion of the binder polymer to be made which retains good water-resistance in the dried paint. The modified starch allows paints to be made with less dependence on materials obtained from non-renewable resources whilst retaining a low water-sensitivity.

Composition aqueuse stable éventuellement structurée de revêtement architectural résistant à l'eau, ne présentant aucun danger pour l'environnement (en particulier, une peinture) et contenant un polymère liant formant une pellicule, composé d'un amidon modifié par la présence d'acide carboxylique ou de groupes carboxylate inorganiques, et lié (probablement greffé) à des chaînes de monomères copolymérisés mono-éthylèniquement insaturés (par exemple, des copolymères "acryliques", "vinyliques" ou "styréniques"), ce qui permet d'obtenir une dispersion aqueuse stable du polymère liant et confère à la peinture sèche une résistance à l'eau appréciable. L'amidon modifié permet de préparer des peintures de façon moins dépendante de matériaux obtenus à partir de ressources non renouvelables, tout en conservant une sensibilité à l'eau très limitée.

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