US3903328A - Conductive coating - Google Patents
Conductive coating Download PDFInfo
- Publication number
- US3903328A US3903328A US464419A US46441974A US3903328A US 3903328 A US3903328 A US 3903328A US 464419 A US464419 A US 464419A US 46441974 A US46441974 A US 46441974A US 3903328 A US3903328 A US 3903328A
- Authority
- US
- United States
- Prior art keywords
- coating
- pigmented
- copper
- graphite
- process according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/52—Two layers
- B05D7/54—No clear coat specified
- B05D7/544—No clear coat specified the first layer is let to dry at least partially before applying the second layer
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/12—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain a coating with specific electrical properties
Definitions
- ABSTRACT A process of applying a conductive coating to an article to provide electromagnetic and electrostatic energy shielding and grounding.
- the article is first coated with a sufficient amount of a metallic copper pigmented resin to provide a pigment particle to particle contact upon drying.
- a synergistic effect is obtained by then coating the copper pigment with a graphite pigmented resin.
- a sufficient amount of graphite pigmented resin is used to prevent oxidation of the copper pigment and enhance electrical conductivity.
- a conductive coating is applied to an article for providing an electromagnetic energy shield, and electrostatic grounding, through essentially a two step coating process.
- the article is first coated with a sufficient amount of a metallic copper pigment dispersed in a thermoplastic resin binder to provide a pigment particle to particle contact upon drying.
- the copper pigment coating is coated with a sufficient amount of conductive graphite, made up of a graphite pigment dispersed in a resin, to prevent oxidation of the copper coating and enhance electrical conductivity.
- the interior of a machine housing which is to include electrical and electronic apparatus is provided with a conductive coating for electromagnetic and electrostatic energy shielding and grounding purposes.
- the housing can be made up of any moldable polymeric material such as a modified polyphenylene oxide, polyolefin, polyamide, polyvinyl chloride, etc., capable of storing a static charge.
- a metallic copper pigmented thermoplastic resin through conventional spray painting techniques related to heavily pigmented paints.
- This first coating is then allowed to dry, or is dryed through application of heat.
- a conductive graphite coating made up of a graphite pigmented water-dispersed resin is applied to the first coating.
- This second coating will elimi nate oxidation of the copper and enhance the electrical conductivity of the coating as a whole. That is, a synergistic effect is provided through the coating of the machine housing with both a copper and a graphite material.
- EXAMPLE I The interior of a machine cover made up of Noryl (a moldable modified polyphenylene oxide marketed by General Electric Company) and molded into a console cover for an IBM Mag Card II was first cleaned with a solvent to remove contamination such as mold releases and dirt. To the cleaned and dryed interior surface was applied, through spray painting techniques, an Electrodag 435 (marketed by Acheson Colloids Company, Port Huron, Mich.) copper conductive coating diluted one to one with a commercial grade lacquer thinner. This first coating was applied in a sufficient amount to provide a 3 mil dried thickness and was then allowed to dry. The drying time to touch at ambient temperature is three to five minutes and can be overcoated in 15 minutes.
- Noryl a moldable modified polyphenylene oxide marketed by General Electric Company
- IBM Mag Card II To the cleaned and dryed interior surface was applied, through spray painting techniques, an Electrodag 435 (marketed by Acheson Colloids Company, Port Huron, Mich.) copper conductive coating diluted one to one with a commercial grade
- composition obtained through various analysis techniques, in terms of percent solids and percent solvent of the copper conductive wet coating diluted one to one with a commercial grade lacquer thinner (such as AL-IOO, marketed by Austin Lacquer Company, Austin, Texas) is as follows:
- Binder Composition Thermoplastic ethyl cellulose resin.
- Electrodag ES 3376 (marketed by Acheson Colloids Company) coating which is a graphite pigmented water-dispersed resin.
- the composition of the Electrodag ES337G is set out below.
- Binder Composition Vinyl acetate resin which upon drying and curing is a homopolymer of polyvinyl acetate.
- the above coated housing provided good shielding from electromagnetic energy such as radar and other frequency radiation. It also provided good electrical continuity for discharge of electrostatic energy to ground.
- EXAMPLE 2 A first coating of metallic copper pigment was applied as set out in Example 1. Within two to three days, electrical continuity became noticeably diminished due to oxidation of the copper. Good electromagnetic shielding was maintained though. Thus, the copper pigment alone would not maintain sufficient electrical conductivity for discharge of electrostatic energy over a desired time interval. Further, the copper coating when used alone had a tendency to flake. This flaking had an adverse effect on the card reading mechanism in the IBM Mag Card ll Console.
- EXAMPLE 4 The two coating process referred to in Example 1 provided greater electromagnetic shielding and electrostatic grounding qualities than the sum of the one coating processes of Examples 2 and 3 over a desired useful life.
- a conductive coating is applied to an article for providing electromagnetic and electrostatic energy shielding and grounding through essentially a two step coating process.
- the article is first coated with a sufficient amount of a metallic copper pigment dispersed in a thermoplastic resin binder to provide a pigment particle to particle contact upon drying.
- the copper pigment coating is coated with a sufficicnt amount of conductive graphite, made up of a graphite pigment dispersed in a resin, to prevent oxidation of the copper coating and enhance electrical conductivity.
- a process of applying a conductive coating to an article comprising:
- said copper pigmented resin contains within the range of from about 25 to 40% by weight metallic copper pigment.
- thermoplastic resin is ethyl cellulose.
- a process of applying a conductive coating to an article for electromagnetic shielding electrostatic grounding purposes comprising:
- thermoplastic resin is ethyl cellulose.
- a process according to claim 10 wherein said water-dispersed resin is comprised of vinyl acetate.
- said copper pigmented resin contains within the range of from about 5 to 15% by weight thermoplastic resin binder.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paints Or Removers (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Conductive Materials (AREA)
- Manufacturing Of Electric Cables (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US464419A US3903328A (en) | 1974-04-26 | 1974-04-26 | Conductive coating |
DE2460482A DE2460482C3 (de) | 1974-04-26 | 1974-12-20 | Verfahren zum Herstellen eines leitenden Überzugs |
GB309675A GB1439126A (en) | 1974-04-26 | 1975-01-24 | Conductive coating |
IT20106/75A IT1031596B (it) | 1974-04-26 | 1975-02-11 | Processo per applicare un rivestimento conduttivo ad un articolo in particolare per ottenerela dispersione verso massa e laschermatura di cariche elettrostatiche ed elettromagnetiche |
FR7507778A FR2279829A1 (fr) | 1974-04-26 | 1975-03-06 | Procede d'application d'un revetement conducteur |
CA222,323A CA1032418A (en) | 1974-04-26 | 1975-03-14 | Conductive coating |
JP3125875A JPS5534966B2 (de) | 1974-04-26 | 1975-03-17 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US464419A US3903328A (en) | 1974-04-26 | 1974-04-26 | Conductive coating |
Publications (1)
Publication Number | Publication Date |
---|---|
US3903328A true US3903328A (en) | 1975-09-02 |
Family
ID=23843873
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US464419A Expired - Lifetime US3903328A (en) | 1974-04-26 | 1974-04-26 | Conductive coating |
Country Status (7)
Country | Link |
---|---|
US (1) | US3903328A (de) |
JP (1) | JPS5534966B2 (de) |
CA (1) | CA1032418A (de) |
DE (1) | DE2460482C3 (de) |
FR (1) | FR2279829A1 (de) |
GB (1) | GB1439126A (de) |
IT (1) | IT1031596B (de) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4243460A (en) * | 1978-08-15 | 1981-01-06 | Lundy Electronics & Systems, Inc. | Conductive laminate and method of producing the same |
US4698197A (en) * | 1985-02-12 | 1987-10-06 | The United States Of America As Represented By The United States Department Of Energy | Magnetic shielding |
US5416668A (en) * | 1993-11-09 | 1995-05-16 | At&T Corp. | Shielded member |
US5705219A (en) * | 1991-04-22 | 1998-01-06 | Atotech Deutschland Gmbh | Method for coating surfaces with finely particulate materials |
EP1800764A1 (de) * | 2005-12-20 | 2007-06-27 | Sgl Carbon Ag | Verfahren zur Beschichtung von Graphitfolie |
EP1800763A1 (de) * | 2005-12-20 | 2007-06-27 | Sgl Carbon Ag | Verfahren zur Beschichtung von Graphitfolie |
US20090123679A1 (en) * | 2007-11-13 | 2009-05-14 | Denome Frank William | Printed water soluble film with desired dissolution properties |
US20090120316A1 (en) * | 2007-11-13 | 2009-05-14 | Denome Frank William | Process for creating a unit dose product with a printed water soluble material |
US20100294153A1 (en) * | 2009-05-19 | 2010-11-25 | Stephane Content | Method for printing water-soluble film |
US20130266795A1 (en) * | 2012-03-20 | 2013-10-10 | Seashell Technology, Llc | Mixtures, Methods and Compositions Pertaining To Conductive Materials |
WO2015148489A3 (en) * | 2014-03-24 | 2016-01-28 | Apple Inc. | Magnetic shielding in inductive power transfer |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4404125A (en) * | 1981-10-14 | 1983-09-13 | General Electric Company | Polyphenylene ether resin compositions for EMI electromagnetic interference shielding |
US4508640A (en) * | 1981-11-24 | 1985-04-02 | Showa Denko Kabushiki Kaisha | Electromagnetic wave-shielding materials |
AT386720B (de) * | 1986-05-27 | 1988-10-10 | Alcatel Austria Ag | Abgeschirmtes gehaeuse |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2134870A (en) * | 1936-03-14 | 1938-11-01 | Mallory & Co Inc P R | Resistance element |
US2781277A (en) * | 1954-01-12 | 1957-02-12 | Sanders Associates Inc | Method of manufacturing electrical resistors |
US3006785A (en) * | 1958-04-16 | 1961-10-31 | S E C L Societa Elettrotecnica | Electric resistors |
US3247478A (en) * | 1961-03-20 | 1966-04-19 | Aerological Res Inc | Electrical hygrometer |
US3298896A (en) * | 1962-05-23 | 1967-01-17 | Szegvari Andrew | Film for receiving, storing or controlling electric impulses |
US3779807A (en) * | 1971-10-12 | 1973-12-18 | Owens Illinois Inc | Process for applying multiple microelectronic layers to substrate |
US3783021A (en) * | 1969-03-03 | 1974-01-01 | Eastman Kodak Co | Conducting lacquers for electrophotographic elements |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH336468A (de) * | 1954-11-29 | 1959-02-28 | Philips Nv | Verfahren zur Herstellung einer leitenden Graphitschicht auf einer isolierenden Unterlage |
GB1145450A (en) * | 1966-04-08 | 1969-03-12 | Gen Electric | Method of making conductive coatings on the surface of an encapsulated electrical device |
GB1266422A (de) * | 1968-05-23 | 1972-03-08 |
-
1974
- 1974-04-26 US US464419A patent/US3903328A/en not_active Expired - Lifetime
- 1974-12-20 DE DE2460482A patent/DE2460482C3/de not_active Expired
-
1975
- 1975-01-24 GB GB309675A patent/GB1439126A/en not_active Expired
- 1975-02-11 IT IT20106/75A patent/IT1031596B/it active
- 1975-03-06 FR FR7507778A patent/FR2279829A1/fr active Granted
- 1975-03-14 CA CA222,323A patent/CA1032418A/en not_active Expired
- 1975-03-17 JP JP3125875A patent/JPS5534966B2/ja not_active Expired
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2134870A (en) * | 1936-03-14 | 1938-11-01 | Mallory & Co Inc P R | Resistance element |
US2781277A (en) * | 1954-01-12 | 1957-02-12 | Sanders Associates Inc | Method of manufacturing electrical resistors |
US3006785A (en) * | 1958-04-16 | 1961-10-31 | S E C L Societa Elettrotecnica | Electric resistors |
US3247478A (en) * | 1961-03-20 | 1966-04-19 | Aerological Res Inc | Electrical hygrometer |
US3298896A (en) * | 1962-05-23 | 1967-01-17 | Szegvari Andrew | Film for receiving, storing or controlling electric impulses |
US3783021A (en) * | 1969-03-03 | 1974-01-01 | Eastman Kodak Co | Conducting lacquers for electrophotographic elements |
US3779807A (en) * | 1971-10-12 | 1973-12-18 | Owens Illinois Inc | Process for applying multiple microelectronic layers to substrate |
Cited By (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4243460A (en) * | 1978-08-15 | 1981-01-06 | Lundy Electronics & Systems, Inc. | Conductive laminate and method of producing the same |
US4698197A (en) * | 1985-02-12 | 1987-10-06 | The United States Of America As Represented By The United States Department Of Energy | Magnetic shielding |
US5705219A (en) * | 1991-04-22 | 1998-01-06 | Atotech Deutschland Gmbh | Method for coating surfaces with finely particulate materials |
US5416668A (en) * | 1993-11-09 | 1995-05-16 | At&T Corp. | Shielded member |
US20070160751A1 (en) * | 2005-12-20 | 2007-07-12 | Sgl Carbon Ag | Method for coating graphite foil and method for heat dissipation in electronic equipment |
EP1800763A1 (de) * | 2005-12-20 | 2007-06-27 | Sgl Carbon Ag | Verfahren zur Beschichtung von Graphitfolie |
US7700162B2 (en) | 2005-12-20 | 2010-04-20 | Sgl Carbon Ag | Method for coating graphite foil |
EP1800764A1 (de) * | 2005-12-20 | 2007-06-27 | Sgl Carbon Ag | Verfahren zur Beschichtung von Graphitfolie |
US20090123679A1 (en) * | 2007-11-13 | 2009-05-14 | Denome Frank William | Printed water soluble film with desired dissolution properties |
US20090120316A1 (en) * | 2007-11-13 | 2009-05-14 | Denome Frank William | Process for creating a unit dose product with a printed water soluble material |
US8087357B2 (en) | 2007-11-13 | 2012-01-03 | The Proctor & Gamble Company | Process for creating a unit dose product with a printed water soluble material |
US9446865B2 (en) | 2009-05-19 | 2016-09-20 | The Procter & Gamble Company | Method for producing a water-soluble detergent pouch with a graphic printed thereon |
US20100294153A1 (en) * | 2009-05-19 | 2010-11-25 | Stephane Content | Method for printing water-soluble film |
US8757062B2 (en) | 2009-05-19 | 2014-06-24 | The Procter & Gamble Company | Method for printing water-soluble film |
US9969154B2 (en) | 2009-05-19 | 2018-05-15 | The Procter & Gamble Company | Method for printing water-soluble film |
US20130266795A1 (en) * | 2012-03-20 | 2013-10-10 | Seashell Technology, Llc | Mixtures, Methods and Compositions Pertaining To Conductive Materials |
US9441117B2 (en) * | 2012-03-20 | 2016-09-13 | Basf Se | Mixtures, methods and compositions pertaining to conductive materials |
US9902863B2 (en) | 2012-03-20 | 2018-02-27 | Basf Se | Mixtures, methods and compositions pertaining to conductive materials |
CN106165036A (zh) * | 2014-03-24 | 2016-11-23 | 苹果公司 | 感应电力传输中的磁屏蔽 |
US9852844B2 (en) | 2014-03-24 | 2017-12-26 | Apple Inc. | Magnetic shielding in inductive power transfer |
WO2015148489A3 (en) * | 2014-03-24 | 2016-01-28 | Apple Inc. | Magnetic shielding in inductive power transfer |
CN109065342A (zh) * | 2014-03-24 | 2018-12-21 | 苹果公司 | 感应电力传输中的磁屏蔽 |
CN106165036B (zh) * | 2014-03-24 | 2019-01-11 | 苹果公司 | 感应电力传输中的磁屏蔽 |
EP3528267A1 (de) * | 2014-03-24 | 2019-08-21 | Apple Inc. | Magnetische abschirmung bei der induktiven leistungsübertragung |
Also Published As
Publication number | Publication date |
---|---|
GB1439126A (en) | 1976-06-09 |
DE2460482B2 (de) | 1981-04-30 |
JPS5534966B2 (de) | 1980-09-10 |
DE2460482A1 (de) | 1975-11-20 |
FR2279829A1 (fr) | 1976-02-20 |
IT1031596B (it) | 1979-05-10 |
JPS50139994A (de) | 1975-11-10 |
FR2279829B1 (de) | 1977-04-15 |
CA1032418A (en) | 1978-06-06 |
DE2460482C3 (de) | 1982-01-21 |
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