Patent EP0597670A1 successfully refreshed from Google Patents.
EP0597670A1
Expired / Lapsed
EP
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Method of manufacturing electromagnetic wave shielding plastic molding
Assignee: TOKYO INGS CO Ltd
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Filing: 1993-11-09
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Granted: —
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Expires: 2013-11-09
Abstract
Abstract The present invention provides a method of manufacturing an electromagnetic wave shielding plastic molding, which comprises the step of, without prior washing and without providing a primer layer, or after providing a water-soluble primer layer, forming a conductive layer comprising at least one selected from the group consisting of Al, Cu, Ni, Cr and Sn and alloys thereof by high-frequency excited plasma. There is available an electromagnetic wave shielding plastic molding which is excellent in electromagnetic wave shielding effect, adhering strength, humidity resistance and hardness and gives economic advantages, hence useful as an electromagnetic wave shield for a plastic molding such as the housing for portable telephone.
Inventors
- 👤 Akira Motoki
- 👤 Yoichi Murayama
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 22:31
CPC Classifications
H; H05; H05K; H05K9/00; H05K9/0073; H05K9/0081; H05K9/0084; C; C23; C23C; C23C14/00; C23C14/06; C23C14/14; C23C14/16; C23C14/22; C23C14/24; C23C14/32; H01; H01B; H01B1/00; H01B1/20; H01B1/22
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
60 words
A method of manufacturing an electromagnetic wave shielding plastic molding, which comprises the step of providing a conductive layer comprising at least a metal selected from the group consisting of Al, Cu, Ni, Cr and Sn or an alloy thereof by high-frequency excited plasma on the surface of a plastic molding, without prior washing and without providing a primer layer.
Claim 2
Dependent Claim
26 words
A method of manufacturing an electromagnetic wave shielding plastic molding as claimed in Claim 1, wherein said conductive layer comprises a single layer or multiple layers.
Claim 3
Dependent Claim
31 words
A method of manufacturing an electromagnetic wave shielding plastic molding as claimed in Claim 1, wherein after bombardment by high-frequency excited plasma, the conductive layer is provided by high-frequency excited plasma.
Claim 4
Dependent Claim
51 words
A method of manufacturing an electromagnetic wave shielding plastic molding as claimed in Claim 1, wherein, without prior washing and without providing a primer coat layer, an aluminum film having a thickness of from 0.7 to 5.0 µm is formed by high-frequency excited plasma on the surface of the plastic molding.
Claim 5
Dependent Claim
55 words
A method of manufacturing an electromagnetic wave shielding plastic molding as claimed in Claim 1, wherein, without prior washing and without providing a primer coat layer, a copper film having a thickness of from 0.7 to 5.0 µm and an aluminum film are formed by high-frequency excited plasma on the surface of the plastic molding.
Claim 6
Dependent Claim
77 words
A method of manufacturing an electromagnetic wave shielding plastic molding as claimed in Claim 1, wherein, without prior washing and without providing a primer coat layer, a copper film having a thickness of 0.7 to 5.0 µm is formed in advance by high-frequency excited plasma in the same vacuum tank on the surface of the plastic molding, and then a tin film having a thickness of from 0.05 to 2.0 µm is formed by high-frequency excited plasma.
Claim 7
Dependent Claim
84 words
A method of manufacturing an electromagnetic wave shielding plastic molding as claimed in Claim 1, wherein, without prior washing and without providing a primer coat layer, a copper film having a thickness of from 0.7 to 5.0 ~m is formed in advance by high-frequency excited plasma in the same vacuum tank on the surface of the plastic molding, and then a nickel-chromium film having a thickness of from 0.05 to 2.0 µm and a nickel/chromium ratio of 50-80:50-20 is formed by high-frequency excited plasma.
Claim 8
Dependent Claim
85 words
A method of manufacturing an electromagnetic wave shielding plastic molding as claimed in Claim 1, wherein, without prior washing and without providing a primer coat layer, a copper film having a thickness of from 0.7 to 5.0 µm is formed in advance by high-frequency excited plasma in the same vacuum tank on the surface of the plastic molding, and then a metal or alloy film having a thickness of from 0.05 to 2.0 µm is formed in an organic gas atmosphere by high-frequency excited plasma.
Claim 9
Dependent Claim
79 words
A method of manufacturing an electromagnetic wave shielding plastic molding as claimed in Claim 1, wherein, without prior washing and without providing a primer coat layer, a copper film having a thickness of from 0.7 to 5.0 µm is formed in advance by high-frequency excited plasma in the same vacuum tank on the surface of the plastic molding, and then a conductive oxide film having a thickness of from 0.05 to 2.0 µm is formed by high-frequency excited plasma.
Claim 10
Dependent Claim
75 words
A method of manufacturing an electromagnetic wave shielding plastic molding as claimed in Claim 1, wherein, without prior washing and without providing primer coat layer, a copper film having a thickness of from 0.7 to 5.0 µm is formed in advance by high-frequency excited plasma in the same vacuum tank on the surface of the plastic molding, and then a copper electrolytic plating film having a thickness of from 10 to 30 µm is formed.
Claim 11
Dependent Claim
27 words
A method of manufacturing an electromagnetic wave shielding plastic molding as claimed in Claim 10, wherein a protecting film is formed on said copper electrolytic plating film.
Claim 12
Independent Claim
69 words
A method of manufacturing an electromagnetic wave shielding plastic molding, which comprises the steps of providing a primer coat layer comprising a water-soluble paint on the surface of a plastic molding containing a filler, and after drying, providing a conductive layer comprising at least a metal selected from the group consisting of Al, Cu, Ni. Cr and Sn and alloys thereof by high-frequency excited plasma in a vacuum tank.
Claim 13
Dependent Claim
26 words
A method of manufacturing an electromagnetic wave shielding plastic molding as claimed in Claim 12, wherein said conductive layer comprises a single layer or multiple films.
Claim 14
Dependent Claim
79 words
A method of manufacturing an electromagnetic wave shielding plastic molding as claimed in Claim 12, wherein a primer coat layer comprising a water-soluble paint and having a thickness of from 1 to 30 µm is formed on the surface of the plastic molding containing a filler, and after low-temperature drying at a temperature of up to 100°C, an aluminum film having a thickness of from 0.6 to 5.0 µm is formed by high-frequency excited plasma in a vacuum tank.
Claim 15
Dependent Claim
100 words
A method of manufacturing an electromagnetic wave shielding plastic molding as claimed in Claim 14, wherein a primer coat layer comprising a water-soluble paint and having a thickness of from 1 to 30 µm is formed on the surface of the plastic molding containing a filler, then after low-temperature drying at a temperature of up to 100°C, a copper film having a thickness of from 0,7 to 5.0 µm is formed in advance by high-frequency excited plasma in the vacuum tank, and a corrosion-resistant metal or alloy film having a thickness of from 0.05 to 3.0 µm is further formed.
Claim 16
Dependent Claim
29 words
A method of manufacturing an electromagnetic wave shielding plastic molding as claimed in Claim 15, wherein said corrosion-resistant metal or alloy film is formed in an organic gas atmosphere.
Claim 17
Independent Claim
95 words
A method of manufacturing an electromagnetic wave shielding plastic molding, which comprises the steps of previously washing parts of surface of a plastic molding, which are contacted by molding pins or sliding cores adhering a sliding oil at the surface thereof, using an organic solvent or organic solvents, followed by bombard-treating the surface of plastic molding with high-frequency plasma, and then providing a conductive layer comprising at least one selected from the group consisting of al, Cu, Ni, Cr and sn and alloys thereof by high-frequency excited plasma on the surface of a plastic molding.
Claim 18
Dependent Claim
16 words
A method as claimed in claim 17, wherein the organic solvent has a low boiling points.
Claim 19
Dependent Claim
21 words
a method as claimed in claim 18, wherein the organic solvent is selected from the group of ethanol, n-hexane and diethylether.
Claim 20
Independent Claim
49 words
A method of manufacturing an electromagnetic wave shielding plastic moulding, which comprises the step of providing said plastic moulding with a conductive layer comprising at least a metal selected from the group consisting of Al, Cu, Ni, Cr and Sn or an alloy thereof by high-frequency excited plasma deposition.
References Cited (Backward Citations)
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