EP0077059A2
Expired / Lapsed
EP
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Polyphenylene ether resin compositions for EMI electromagnetic interference shielding
Assignee: General Electric Co
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Filing: 1982-10-09
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Granted: —
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Expires: 2002-10-09
Abstract
Abstract Compositions or composites comprising a polyphenylene ether-styrene resin blend or composition are disclosed which have electromagnetic shielding properties so that when the compositions are used for electronic equipment components of housings they provide shielding against electromagnetic interference referred to as EMI. The composites eliminate the secondary treatments which have been used heretofore to provide these shielding properties, such as the application of electrically conductive silver, nickel, copper and graphite coatings, or the use of metal screens. The novel compositions of a polyphenylene ether-styrene blend contain as a conductive material, which attenuates the EMI, aluminium flakes, or a combination of aluminium flakes with carbon fibers or with a higly conductive carbon black, or a combination of carbon fibers with conductive carbon black, or carbon fibers per se.
Inventors
- 👤 Visvaldis Abolins
- 👤 Joel Matthew Caraher
- 👤 Richard Charles Bopp
- 👤 Eric Magnus Lovgren
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 15:41
CPC Classifications
H; H05; H05K; H05K9/00; H05K9/0073; H05K9/0081; H05K9/0083; C; C08; C08K; C08K3/00; C08K3/02; C08K3/04; C08K3/08; C08L; C08L71/00; C08L71/08; C08L71/10; C08L71/12; C08L71/123; H01; H01B; H01B1/00; H01B1/20; H01B1/22; H01B1/24; H05K9/009
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
59 words
A thermoplastic molding composition which comprises: (a) a polyphenylene ether-styrene resin composition; and (b) as a conductive material, aluminum flakes, a combination of aluminum flakes with carbon fibers or conductive carbon black, or a combination of carbon fibers and conductive carbon black, or carbon fibers, in an amount sufficient to render the composition when molded shielding against electromagnetic interference.
Claim 2
Dependent Claim
59 words
A thermoplastic molding composition which comprises: (a) a polyphenylene ether-styrene resin composition; and (b) as a conductive material, aluminum flakes, a combination of aluminum flakes with carbon fibers or conductive carbon black, or a combination of carbon fibers and conductive carbon black, or carbon fibers, in an amount sufficient to render the composition when molded shielding against electromagnetic interference.
Claim 3
Dependent Claim
14 words
A composition as defined in Claim 1 wherein the conductive material is aluminum flakes.
Claim 4
Dependent Claim
21 words
A composition as defined in Claim 1 wherein the aluminum flakes have an approximate size of 0.040" X 0.050" X 0.001".
Claim 5
Dependent Claim
20 words
A composition as defined in Claim 1 wherein the conductive material is a combination of aluminum flakes with carbon fibers.
Claim 6
Dependent Claim
21 words
A composition as defined in Claim 1 wherein the conductive material is a combination of aluminum flakes and conductive carbon black.
Claim 7
Dependent Claim
21 words
A composition as defined in Claim 1 wherein the conductive material is a combination of carbon fibers and conductive carbon black.
Claim 8
Dependent Claim
14 words
A composition as defined in Claim 1 wherein the conductive material is carbon fibers.
Claim 9
Dependent Claim
13 words
A composition as defined in Claim 1 wherein conductive material is carbon black.
Claim 10
Dependent Claim
112 words
A composition as defined in Claim 1 wherein the polyphenylene ether resin includes structural units of the formula: wherein Q, Q', Q" and Q" ' are independently selected from the group consisting of hydrogen, hydrocarbon radicals, halohydrocarbon radicals having at least two carbon atoms between the halogen atom and the phenyl nucleus, hydrocarbonoxy radicals and halohydrocarbonoxy having at least two carbon atoms between the halogen atom and the phenyl nucleus, and Q', Q" and Q"' in addition may be halogen with the proviso that Q and Q' are both free of a tertiary carbon atom; and n represents the total number of monomer residues and is an integer of at least 50..
Claim 11
Dependent Claim
15 words
A composition as defined in Claim 9 wherein the polyphenylene ether resin is poly(2,6-dimethyl-1,4-phenylene) ether.
Claim 12
Dependent Claim
14 words
A composition as defined in Claim 1 where the styrene resin is a polystyrene.
Claim 13
Dependent Claim
16 words
A composition as defeind in Claim 1 wherein the styrene resin is a high impact polystyrene.
Claim 14
Dependent Claim
27 words
A composition as defined in Claim 1 wherein the polyphenylene ether resin is poly(2-6-dimethyl-1,4-phenylene)ether, the styrene resin is a polystyrene and the conductive material is aluminum flakes.
Claim 15
Dependent Claim
21 words
A composition as defined in Claim 13 wherein the aluminum flakes have an approximate size of 0.040" X 0.050" X 0.001".
Claim 16
Dependent Claim
33 words
A composition as defined in Claim 1 wherein the polyphenylene ether resin is poly(2,6-dimethyl-1,4-phenylene)ether, the styrene resin is a polystyrene, and the conductive material is a combination of aluminum flakes with carbon fibers.
Claim 17
Dependent Claim
34 words
A composition as defined in Claim 1 wherein the polyphenylene ether resin is poly(2,6-dimethyl-l,4-phenylene)ether, the styrene resin is a polystyrene, and the conductive material is a combination of aluminum flakes with conductive carbon black.
Claim 18
Dependent Claim
21 words
The compositions as defined in Claims 13, 14, 15 or 16 wherein the styrene resin is a high impact polystyrene resin.
Claim 19
Dependent Claim
34 words
The composition as defined in Claim 1 which comprises 100 parts by weight of the polyphenylene ether-styrene resin composition and from about 5 parts to about 250 parts by weight of the conductive material.
Claim 20
Dependent Claim
11 words
A molded composition obtained by molding the composition of Claim 1.
Claim 21
Dependent Claim
15 words
An electronic equipment component exhibiting electromagnetic shielding, manufactured from the composition described in Claim 1.
Claim 22
Dependent Claim
17 words
A housing for electric/electronic equipment subject to electromagnetic interference, manufactured from the composition described in Claim 1.
References Cited (Backward Citations)
No citation records indexed.
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