Autodepositable aqueous compositions including dispersed...

C - Chemistry – Metallurgy – 09 – D

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C09D 127/08 (2006.01) B05D 1/18 (2006.01) B05D 3/10 (2006.01) C04B 9/02 (2006.01) C08K 9/00 (2006.01) C09D 5/08 (2006.01)

Patent

CA 2345476

An autodepositing liquid composition comprises dispersed non-film-forming polymer particles in addition to the dispersed film forming polymer characteristic of all autodepositing liquid compositions. Preferably, the non- film-forming polymer particles are gas-tight microballoons filled with a gas such as air and have an average particle size less than 1µm. Such particles act in the autodepositing liquid compositions and in the dried coatings formed from them as opaque white pigments, unless the coatings are heated above about 130~C. if so heated, the coatings, unless they contain other heat stable pigments, become irreversibly transparent.

L'invention concerne une composition liquide autodéposante dans laquelle sont dispersées des particules de polymères non-filmogènes en sus des polymères filmogènes en dispersion caractéristiques de l'ensemble des compositions liquides autodéposantes. Les particules de polymères non-filmogènes sont de préférence des microballons étanches aux gaz remplis d'un gaz tel que l'air, et d'une taille moyenne inférieure à 1µm. Ces particules se comportent dans les compositions liquides autodéposantes et les revêtements secs qui en sont issus, comme des pigments blancs opaques, à moins de chauffer les revêtements à plus de 130 ·C. S'ils sont ainsi chauffés, les revêtements, à moins de contenir d'autres pigments thermostables, deviennent irréversiblement transparents.

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