Infrared-transparent structure including an adherent,...

Details Infrared-transparent structure including an adherent,... Infrared-transparent structure including an adherent,...

G - Physics

02

B

G02B 1/10 (2006.01) C09J 183/04 (2006.01) G02B 1/11 (2006.01) G02B 3/00 (2006.01) G02B 13/14 (2006.01)

Patent

CA 2228279

An infrared-transparent structure (20) includes a first infrared-transparent element (22) that is transparent to infrared radiation in the 3.6-7 micrometer wavelength range, preferably coated with a zinc-sulfide antireflective coating (26), and a layer (30) of a solvent-free, infrared-transparent polymer transparent on the first infrared-transparent element (22). The polymer is formed of an addition-cured silicone, such as addition-cured dimethyl silicone, and a small amount of an adhesion promoter, such as 3- glycidoxypropyltrimethoxysilane. The polymer layer (30) may either be a surface layer, or it may be used as an adhesive between the first infrared- transparent element and a second infrared-transparent element.

La présente invention concerne une structure (20) transparente aux infrarouges qui se compose de deux éléments. Le premier élément (22), qui est transparent aux infrarouges dans la plage de longueurs d'ondes de 3,6 µm à 7 µm, est de préférence traité au moyen d'un revêtement anti-réfléchissant (26) à base de sulfure de zinc. Le second élément est une couche (30) d'un polymère exempt de solvant, transparent aux infrarouges, et transparente sur le premier élément (22) transparent aux infrarouges. Le polymère, qui est fait d'un silicone durci par un additif, et qui peut être par exemple un diméthylsilicone durci par un additif, comporte une petite quantité de promoteur d'adhésion tel que le 3-glycidoxypropyltriméthoxysilane. Cette couche polymère (30) peut, soit être une couche superficielle, soit servir d'adhésif entre le premier élément (20) transparent aux infrarouges et le second élément (30) transparent aux infrarouges.

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