EP0107863A2
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EP
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A shielding material of electromagnetic waves
Assignee: National Institute of Advanced Industrial Science and Technology
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Filing: 1983-10-28
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Granted: —
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Expires: 2003-10-28
Abstract
Abstract The shielding material of electromagnetic waves of the invention is formed of a polymeric material as the matrix and an inorganic powder, e.g. mica flakes, metallized on the surface of the particles with a metal e.g. nickel, as the conductive dispersant in the matrix. The metallization of the inorganic powder is performed by chemical plating, preferably, after pretreatment with an organic compound having a functional group capable of capturing ions of a noble metal and then with a solution containing a noble metal, preferably, palladium. This pretreatment is effective to increase the firmness of bonding between the metallizing layer and the surface of the particles so that the shielding effect of the material is greatly improved.
Inventors
- 👤 Tokuzo Kanbe
- 👤 Yaomi Kumagai
- 👤 Keiji Nemoto
- 👤 Kei Urabe
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 19:18
CPC Classifications
G; G21; G21F; G21F1/00; G21F1/02; G21F1/10; G21F1/103; H; H01; H01B; H01B1/00; H01B1/20; H01B1/22
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
44 words
A shielding material of electromagnetic waves which comprises a polymeric material as the matrix and an inorganic powder composed of particles having a metallizing layer of a metal on the surface formed by chemical plating and dispersed in the polymeric matrix as a dispersant.
Claim 2
Dependent Claim
44 words
A shielding material of electromagnetic waves which comprises a polymeric material as the matrix and an inorganic powder composed of particles having a metallizing layer of a metal on the surface formed by chemical plating and dispersed in the polymeric matrix as a dispersant.
Claim 3
Dependent Claim
56 words
The shielding material as claimed in claim 1 wherein the chemical plating of the inorganic powder is preceded by a pretreatment of the powder with an organic compound having, in a molecule, at least one functional group capable of capturing ions of a noble metal and then .with a solution containing ions of a noble metal.
Claim 4
Dependent Claim
16 words
The shielding material as claimed in claim 1 wherein the inorganic powder is a mica powder.
Claim 5
Dependent Claim
17 words
The shielding material as claimed in claim 1 wherein the metal of the metallizing layer is nickel.
Claim 6
Dependent Claim
14 words
The shielding material as claimed in claim 2 wherein the noble metal is palladium.
Claim 7
Dependent Claim
24 words
The shielding material as claimed in claim 1 which contains at least 10% by weight of the inorganic powder composed of the metallized particles.
Claim 8
Dependent Claim
52 words
The shielding material as claimed in claim 2 wherein the functional group in the organic compound is selected from the class consisting of carboxyl group, ester group, amino group, hydroxy group, nitrile group, halogen atoms, isocyanate group, glycidyloxy group and alkoxy and alkenyl groups bonded to an atom of silicon or titanium.
Claim 9
Dependent Claim
35 words
The shielding material as claimed in claim 2 wherein the inorganic powder adsorbs from 0.5 to 2.0% by weight of the organic compound based on the inorganic powder in the pretreatment with the organic compound.
Claim 10
Dependent Claim
54 words
The shielding material as claimed in claim 2 wherein the inorganic powder adsorbs from 3 x 10- s to 3 x 10- 1 part by weight of the ions of the noble metal per 100 parts by weight of the inorganic powder in the pretreatment with a solution containing ions of the noble metal.
Claim 11
Independent Claim
151 words
A method for the preparation of a shielding material of electromagnetic waves which comprises the steps of: (a) contacting an inorganic powder with a solution of an organic compound having, in a molecule, at least one functional group capable of capturing ions of a noble metal whereby to cause adsorption of the organic compound on the inorganic powder; (b) contacting the inorganic powder with an aqueous solution containing ions of a noble metal whereby to cause adsorption of the ions on the inorganic powder; (c) subjecting the inorganic powder to chemical plating with a metal in an aqueous solution containing the ions of the metal; (d) blending the inorganic powder with a polymeric material to form a uniform dispersion of the inorganic powder in the matrix of the polymeric material; and (e) shaping the uniform blend of the inorganic powder and the polymeric material into a form of the shielding material.
Claim 12
Independent Claim
151 words
A method for the preparation of a shielding material of electromagnetic waves which comprises the steps of: (a) contacting an inorganic powder with a solution of an organic compound having, in a molecule, at least one functional group capable of capturing ions of a noble metal whereby to cause adsorption of the organic compound on the inorganic powder; (b) contacting the inorganic powder with an aqueous solution containing ions of a noble metal whereby to cause adsorption of the ions on the inorganic powder; (c) subjecting the inorganic powder to chemical plating with a metal in an aqueous solution containing the ions of the metal; (d) blending the inorganic powder with a polymeric material to form a uniform dispersion of the inorganic powder in the matrix of the polymeric material; and (e) shaping the uniform blend of the inorganic powder and the polymeric material into a form of the shielding material.
References Cited (Backward Citations)
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