Anti-fog film assemblies, method of manufacture, and...

C - Chemistry – Metallurgy – 08 – J

Patent

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Details

C08J 7/04 (2006.01) C08L 75/04 (2006.01)

Patent

CA 2624199

A repositionable and substantially transparent multi-layer anti-fog film assembly (110) comprising a film (130) and an anti-fog layer (120) formed from a polyurethane-film forming composition comprising a surfactant having an isocyanate-reactive moiety and a hydrophobic region and a hydrophilic region effective to provide the layer with anti-fog properties at temperatures that alternate between -23 ~C and 65~C. Specifically, those compositions which incorporate into the polyurethane backbone a surfactant having a hydroxyl group and distinct hydrophilic and hydrophobic regions to alter surface energy as well as incorporating hydrophilic groups to increase the hydrophilicity of the polyurethane without substantially compromising its scratch resistance and chemical resistance. Optionally, an anti-fog film assembly (110) comprises an adhesive layer (140). The anti-fog film assembly (110) to be applied with any of a variety of substantially transparent substrates (390) to provide condensation-resistant articles (300) including refrigerator doors (400) and panels (490).

L'invention concerne un ensemble film antibuée (110) multicouche repositionnable et sensiblement transparent qui comprend un film (130) et une couche antibuée (120) formée à partir d'une composition formant un film polyuréthanne qui comprend un tensioactif possédant un fragment réagissant à l'isocyanate et une région hydrophobe et une région hydrophile destinées à conférer à la couche des propriétés antibuée à des températures variant entre -23 °C et 65 °C. De manière spécifique, ces compositions incorporent dans la structure polyuréthanne un tensioactif présentant un groupe hydroxyle et des régions hydrophiles et hydrophobes distinctes afin d'altérer l'énergie de surface ainsi que des groupes hydrophiles afin d'augmenter le caractère hydrophile du polyuréthanne sans compromettre leur résistance aux rayures et leur résistance chimique. L'ensemble film antibuée (110) de l'invention comprend éventuellement une couche adhésive (140). Ledit ensemble film antibuée (110) est destiné à être appliqué sur divers substrats sensiblement transparents (390) afin d'obtenir des articles (300) résistants à la condensation, notamment des portes (400) et des panneaux (490) de réfrigérateurs.

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