US5004561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic wave-shielding thermoplastic resin composition
Assignee: Mitsubishi Gas Chemical Co Inc
•
Filing: 1989-01-23
•
Granted: 1991-04-02
•
Expires: 2009-01-23
Abstract
Abstract An electromagnetic wave-shielding thermoplastic resin composition comprising (A) 100 parts by weight of a thermoplastic resin selected from the group consisting of polypropylene resins, polystyrene resins, acrylonitrile/styrene/butadiene copolymer resin, polybutylene terephthalate resins, polyphenylene ether resins and linear aliphatic polyamide resins, (B) 30 to 300 parts by weight of electrically conductive glass fibers, (C) 5 to 40 parts by weight of carbon black, and (D) 5 to 40 parts by weight of graphite.
Inventors
- 👤 Isao Nomura
- 👤 Kenichi Narita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:42
CPC Classifications
H; H05; H05K; H05K9/00; H05K9/0073; H05K9/0081; H05K9/009; C; C08; C08K; C08K3/00; C08K3/02; C08K3/04; C08K7/00; C08K7/02; C08K7/04; C08K7/14; C08K9/00; C08K9/02; H01; H01B; H01B1/00; H01B1/20; H01B1/22; H01B1/24
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
138 words
An electromagnetic wave-shielding thermoplastic resin composition comprising (A) 100 parts by weight of a thermoplastic resin selected from the group consisting of polypropylene resins, polystyrene resins, acrylonitrile/styrene/butadiene copolymer resin, polybutylene terephthalate resins, polyphenylene ether resins and linear aliphatic polyamide resins, wherein said linear aliphatic polyamides are polymers of monomers selected from the group consisting of combinations of diamines having 6 to 12 carbon atoms with dicarboxylic acids having 6 to 12 carbon atoms, lactams having 6 to 12 carbon atoms and aminocarboxylic acids having 6 to 12 carbon atoms, (B) 100 to 200 parts by weight of electrically conductive glass fibers, (C) 15 to 25 parts by weight of carbon black selected from the group consisting of thermal black channel black, acetylene black and furnace black, and (D) 15 to 25 parts by weight of natural scale-like graphite.
Claim 2
Dependent Claim
138 words
An electromagnetic wave-shielding thermoplastic resin composition comprising (A) 100 parts by weight of a thermoplastic resin selected from the group consisting of polypropylene resins, polystyrene resins, acrylonitrile/styrene/butadiene copolymer resin, polybutylene terephthalate resins, polyphenylene ether resins and linear aliphatic polyamide resins, wherein said linear aliphatic polyamides are polymers of monomers selected from the group consisting of combinations of diamines having 6 to 12 carbon atoms with dicarboxylic acids having 6 to 12 carbon atoms, lactams having 6 to 12 carbon atoms and aminocarboxylic acids having 6 to 12 carbon atoms, (B) 100 to 200 parts by weight of electrically conductive glass fibers, (C) 15 to 25 parts by weight of carbon black selected from the group consisting of thermal black channel black, acetylene black and furnace black, and (D) 15 to 25 parts by weight of natural scale-like graphite.
Claim 3
Dependent Claim
28 words
The composition of claim 1 wherein the polypropylene resins are selected from a homopolymer of propylene and copolymers of propylene and alpha-olefins having 2 to 8 carbon atoms.
Claim 4
Dependent Claim
44 words
The composition of claim 1 wherein the acrylonitrile/styrene/butadiene copolymer resin consists of 25 to 30% by weight of acrylonitrile units, 25 to 30% by weight of butadiene units and the balance being styrene units, provided that the total weight of these units is 100%.
Claim 5
Dependent Claim
20 words
The composition of claim 1 wherein the polybutylene terephthlate resin contain at least 60 mole % of butylene terephthalate units.
Claim 6
Dependent Claim
64 words
The composition of claim 1 wherein the polyphenylene ether resin is a homopolymer or a copolymer of a monocyclic phenol represented by the following formula ##STR3## wherein R 1 represents an alkyl group having 1 to 3 carbon atoms, and R 2 and R 3 , independently from each other, represent a hydrogen atom or an alkyl group having 1 to 3 carbon atoms.
Claim 7
Dependent Claim
20 words
The composition of claim 1 wherein the thermoplastic resin (A) has a melt index of 5 to 50 g/10 min.
Claim 8
Dependent Claim
23 words
The composition of claim 1 wherein the electrically conductive glass fibers (B) are glass fibers having an electrically conductive coating on their surface.
Claim 9
Dependent Claim
32 words
The composition of claim 1 wherein the polystyrene resins are selected from a homopolymer of styrene, random copolymers of styrene and another monomer which is alpha-methylstyrene or chlorostyrene, and high impact-resistant polystrene.
Claim 10
Dependent Claim
81 words
An electromagnetifc wave-shielding resin composition comprising (A) 100 parts by weight of a polyamide resin derived from xylylendediamine as a main diamine component and an alpha,omega-linear aliphatic dicarboxylic acid as a main dicarboxylic acid component. (A') 5 to 100 parts by weight of nylon 66, (B) 30 to 300 parts by weight of electrically conductive glass fibers having a metallic coating, (C) 5 to 40 parts by weight of carbon black, and (D)j 5 to 40 parts by weight of graphite.
Claim 11
Dependent Claim
81 words
An electromagnetifc wave-shielding resin composition comprising (A) 100 parts by weight of a polyamide resin derived from xylylendediamine as a main diamine component and an alpha,omega-linear aliphatic dicarboxylic acid as a main dicarboxylic acid component. (A') 5 to 100 parts by weight of nylon 66, (B) 30 to 300 parts by weight of electrically conductive glass fibers having a metallic coating, (C) 5 to 40 parts by weight of carbon black, and (D)j 5 to 40 parts by weight of graphite.
References Cited (Backward Citations)
US4197218A
Cited
US4305847A
Cited
US4496475A
Cited
US4367306A
Cited
US4559164A
Cited
US4474685A
Cited
US4569786A
Cited
US4562221A
Cited
US4704413A
Cited
US4528213A
Cited
JPS6116957A
Cited
JPS6116942A
Cited
US4715989A
Cited
US4702859A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-04-01 | 1994-10-01 | 1995-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-01 | 1998-10-01 | 1999-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-01 | 2002-10-01 | 2003-04-02 | $7700.00 | Window Closed / Lapsed |