Electromagnetic field absorbing composition

C - Chemistry – Metallurgy – 08 – K

Patent

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Details

C08K 7/04 (2006.01) C08K 7/06 (2006.01) H01Q 17/00 (2006.01) H05K 9/00 (2006.01)

Patent

CA 2756647

This invention relates to the field of an electromagnetic (EM) field absorbing composition, in particular, those capable of providing absorbance in the frequency of commercial radar. The composition finds particular use as a radar absorbing coating for wind turbines, in particular for use in onshore and offshore environments. There are further provided coated surfaces comprising the composition, methods of absorbing EM radiation, and methods of use of such a composition, such that a surface coated in the composition is capable of absorbing EM radiation. There is provided an electromagnetic radiation absorbing composition comprising elongate carbon elements with an average longest dimension in the range of 50 to 1 000 microns, with a thickness in the range of 1 to 15 microns and present in the range of from 0.5 to 20 volume % dried, in a non conductive binder.

Cette invention relève du domaine des compositions absorbant les champs électromagnétiques (EM), en particulier, celles capables d'absorption à la fréquence des ondes radars commerciales. La composition selon l'invention s'avère particulièrement utile en tant que revêtement absorbant les ondes radar pour des turbines à vent, notamment dans des installations à terre et en mer. L'invention concerne, en outre, des surfaces revêtues comprenant la composition, des procédés d'absorption de rayonnements EM, et des procédés d'utilisation de la composition pour qu'une surface revêtue de ladite composition puisse absorber les rayonnements EM. Une composition absorbant les rayonnements électromagnétiques comprenant des éléments en carbone de forme allongée ayant une dimension longue moyenne dans la plage de 50 à 1000 microns, une épaisseur dans la plage de 1 à 15 microns et présente à raison de 0,5 à 20 % en volume sec dans un liant conducteur est décrite.

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