Antistatic polymeric articles having a coating comprising an...

C - Chemistry – Metallurgy – 09 – K

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C09K 3/16 (2006.01) A47G 19/23 (2006.01) B05D 5/12 (2006.01) B05D 7/02 (2006.01)

Patent

CA 2212758

An article comprised of a polymeric material bearing a coating. The coating comprises a residual layer formed by applying and allowing to dry a mixture containing from about 7.5 to about 23.5 weight percent of a humidity sensitive antistatic surfactant compound and from about 10 to about 30 weight percent of a water soluble ink. The article possesses an electrostatic potential of from about -5 to about +5 kilovolts as measured at one inch from the coating. A process for producing a formed article which is relatively free from the effects of static electricity. The process includes the steps of topically applying a mixture comprising a humidity sensitive antistatic surfactant compound to a stock comprising a foamed polymeric material, conditioning the foam stock in humidity-controlled environment effective to reduce electrostatic potential of the stock to between from about -5 to about +5 kilovolts, and thereafter forming the article from the conditioned foam stock. The polymeric material may comprise polystyrene and the water soluble ink may comprise a mixing white ink. The humidity sensitive surfactant is preferably comprised of a mixture of sodium alkyl sulfonates consisting essentially of sulfonates having the molecular formulas C10-18H21-39SO3Na.

Article constitué d'un polymère portant un revêtement. Celui-ci comprend une couche résiduelle, formée en appliquant et en laissant sécher un mélange contenant de 7,5 à 23,5 % environ en poids d'un surfactif antistatique sensible à l'humidité, et de 10 à 30 % environ en poids d'une encre hydrosoluble. L'article a un potentiel électrostatique de -5 à +5 kilovolts environ, mesuré à un pouce du revêtement. Méthode pour produire un article mis en forme, relativement exempt des effets de l'électricité statique. La méthode comprend l'application topique d'un mélange renfermant un surfactif antistatique sensible à l'humidité, à une alimentation constituée d'une matière polymère expansée, le conditionnement de l'alimentation de mousse dans un milieu à humidité contrôlée, permettant de réduire le potentiel électrostatique de l'alimentation entre -5 et +5 kilovolts environ, puis la mise en forme de l'article à partir de l'alimentation de mousse conditionnée. La matière polymère peut renfermer du polystyrène et l'encre hydrosoluble peut contenir une encre blanche de mélange. Le surfactif sensible à l'humidité renferme de préférence un mélange de sulfonates de sodium et d'alkyle, comprenant essentiellement des sulfonates de formules molaires C10-18H21-39SO3Na.

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