Anti-fogging film

B - Operations – Transporting – 32 – B

Patent

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117/152

B32B 17/10 (2006.01) B32B 27/30 (2006.01) C09K 3/18 (2006.01)

Patent

CA 2007623

Disclosed is an anti-fogging film having a multilayer structure comprised of at least two layers of a cured film formed on a substrate. The cured film contains as main components (A) polyvinyl alcohol and (B) at least one member selected from (a) colloidal silica having an average particle size of 5 to 200 mµ, (b) an organic silicon compound of the formula R1R2a SiX3-a in which R1 is an organic group having 1 to 10 carbon atoms, R2 is a hydrocarbon group having 1 to 6 carbon atoms, X is a hydrolyzable group and a is 0 or 1, and (c) a hydrolysis product of an organic silicon compound of the formula R1R2a SiX3-a in which R1, R2, X and a are as defined above, wherein the ratio S2/S1 of the weight ratio S2 of component (A) to component (B) in the layer contiguous to the topmost surface layer to the weight ratio S1 of component (A) to component (B) in the topmost surface layer is at least 1.05.

Divulgation concernant une pellicule antibuée, à structure multicouche, composée d'au moins deux couches d'une pellicule réticulée sur un substrat. Les principaux constituants de la pellicule réticulée sont (A) un poly(alcool vinylique) et (B) au moins un constituant choisi parmi (a) une silice colloïdale dont les particules mesurent en moyenne 5 à 200 microns, (b) un composé organique silicié de formule R1R2a SiX3-a, où R1 est un groupe organique de 1 à 10 atomes de carbone, R2 est un groupe hydrocarboné de 1 à 6 atomes de carbone, X est un groupe hydrolysable et a est 0 ou 1, et (c) un produit d'hydrolyse d'un composé organique silicié de formule R1R2a SiX3-a, où R1, R2, X correspondent aux définitions ci-dessus; la valeur S2/S1 du rapport pondéral S2 du constituant (A) au constituant (B) dans la couche contiguë à la couche superficielle la plus à l'extérieur, au rapport pondéral S1 du constituant (A) au constituant (B) dans la couche superficielle la plus à l'extérieur, est d'au moins 1,05.

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