Electromagnetic wave absorbing material containing carbon microspheres
AssigneesKureha Kagaku Kogyo Kabushiki Kaisha, Toyo Boseki Kabushiki Kaisha
InventorAtsushi Tomonaga
Life of this patent
Estimating the term…
Abstract
An electromagnetic wave absorbing material comprising as a conductive material hollow carbon microspheres which are prepared by the use of a coal-base or petroleum-base pitch material and which have a non-cohesive property with one another, and as a matrix a non-conductive material having a specific resistance of greater than 10.sup.3 .OMEGA. cm, the conductive material being mixed with the non-conductive material and the mixture being formed into moldings. The resultant composite moldings exhibit a satisfactory complex dielectric constant, so that the composite material is applicable, for example, as a waveguide microwave absorber, a microwave pollution preventive microwave absorber, a microwave absorber for microwave heating range, or a microwave absorber for an antenna.
Claims9
An electromagnetic wave absorbing material useful for absorbing waves of 8,000 to 10,000 MHz comprising hollow non-cohesive carbon microspheres having a particle size of 50 - 1000.mu. and a wall thickness of 2 - 10.mu. uniformly mixed in a matrix comprising a non-conductive thermosetting or thermoplastic resin having a specific resistance of greater than 10.sup.3 .OMEGA. cm.
Dependencies are inferred from the claim text.