EP0161245A4 - Composition a absorption de rayonnements electromagnetiques a faible densite. - Google Patents

Composition a absorption de rayonnements electromagnetiques a faible densite.

Info

Publication number
EP0161245A4
EP0161245A4 EP19830903870 EP83903870A EP0161245A4 EP 0161245 A4 EP0161245 A4 EP 0161245A4 EP 19830903870 EP19830903870 EP 19830903870 EP 83903870 A EP83903870 A EP 83903870A EP 0161245 A4 EP0161245 A4 EP 0161245A4
Authority
EP
European Patent Office
Prior art keywords
composition
elm
absorber
attenuator
electromagnetic radiation
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.)
Granted
Application number
EP19830903870
Other languages
German (de)
English (en)
Other versions
EP0161245B1 (fr
EP0161245A1 (fr
Inventor
Jitka Solc
Robert Francis Harris
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dow Chemical Co
Original Assignee
Dow Chemical Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Dow Chemical Co filed Critical Dow Chemical Co
Publication of EP0161245A1 publication Critical patent/EP0161245A1/fr
Publication of EP0161245A4 publication Critical patent/EP0161245A4/fr
Application granted granted Critical
Publication of EP0161245B1 publication Critical patent/EP0161245B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
    • H01Q17/004—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems using non-directional dissipative particles, e.g. ferrite powders

Definitions

  • Artificial dielectrics are generally formed by dispersing a magnetic powder or other natural absorber in a dielectric material, such as plastics including thermoplastics and thermosets, ceramics, waxes and the like.
  • the artificial dielectrics which have been formed by loading the aforementioned dielectric binders with magnetic metals, semi-conductors, ferromagnetic oxides or ferrites have very desirable magnetic and dielectric properties.
  • solid ferrites i.e., ferromagnetic ferrites formed of ferric oxide and other bivalent metal oxides
  • ferrites in the form of solid coatings display the higher permeabilities which are required for broad band operation.
  • Such solid ferrite coatings are capable of higher permeabilities than those exhibited by the ferrite powders since the magnetic properties of ferrite decline appreciably by grinding it into powder form.
  • ELM absorbing compositions of this invention it is advantageous to disperse the ELM absorber into the dielectric matrix such that dielectric matrix forms a continuous phase that maintains the particles of ELM absorber in an essentially discrete, spaced apart relationship.
  • Any of a variety of conventional blending procedures for incorporating a colloidal or sub-colloidal particulate into dielectric binders are suitably employed for this purpose.
  • the dielectric matrix having the ELM absorber dispersed therein is prepared by initially forming an aqueous dispersion of the ELM absorber by contacting colloidal or sub-colloidal particles of said absorber with an aqueous solution of a water-soluble surfactant or emulsifier, thereby forming the dispersion which contains from about 5 to about 70 weight percent of the absorber particles.
  • aqueous dispersions of ELM absorbers are the so-called ferrofluids such as disclosed in the U.S. Patent No. 3,981,844, preferably those having an average particle diameter in the range from about 0.05 to about 0.1 micrometer.
  • a water-soluble monomer such as an ethylenically unsaturated carboxylic acid or its salt such as acrylic acid or sodium acrylate; methacrylic acid, itaconic acid and maleic acid; an ethylenically unsaturated carboxamide such as acrylamide; vinyl pyrrolidone; hydroxyalkyl acrylates and meth-acrylates such as hydroxyethyl acrylate, hydroxypropyl acrylate and hydroxyethyl methacrylate; aminoalkyl esters of unsaturated acids such as 2-aminoethyl methacrylate; epoxy functional monomers such as glycidyl methacrylate; sulfoalkyl esters of unsaturated acids such as 2-sulfoethyl methacrylate; ethylenically uns
  • a water-soluble monomer such as an ethylenically unsaturated carboxylic acid or its salt such as acrylic acid or sodium acrylate; methacrylic acid,
  • Suitable catalysts include inorganic persulfate compounds such as sodium persulfate, potassium persulfate, ammonium persulfate; peroxides such as hydrogen peroxide, t-butyl hydroperoxide, dibenzol peroxide and dilauroyl peroxide; azo catalysts such as azobisisobutyronitrile, and other common free-radical generating compounds.
  • peroxides such as hydrogen peroxide, t-butyl hydroperoxide, dibenzol peroxide and dilauroyl peroxide
  • azo catalysts such as azobisisobutyronitrile, and other common free-radical generating compounds.
  • free-radical generating radiation such as ultraviolet radiation, electron beam radiation and gamma radiation.
  • a redox catalyst composition can be employed wherein the polymerization temperature ranges from about 25° to about 80°C.
  • the monomer stream consists of 64 g of styrene, 16 g of butyl acrylate and 3 g of t-butyl hydroperoxide.
  • the aqueous stream consists of 110 g of deionized water, 2.9 g of the potassium salt of a functionalized oligomer ("Polywet KX-4") and 2 g of sodium formaldehyde hydrosulfite.
  • the resulting reaction mixture is stirred and maintained under nitrogen at 90°C for an additional half hour.
  • the resulting 25 percent solids latex is concentrated by distillation under vacuum to a 30.3 percent solids latex (dielectric/ELM absorber) having dispersed particles with a polymeric as well as magnetic characteristic.

Landscapes

  • Compositions Of Macromolecular Compounds (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Hard Magnetic Materials (AREA)
  • Conductive Materials (AREA)
  • Aerials With Secondary Devices (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Paints Or Removers (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
EP83903870A 1983-11-07 1983-11-07 Composition a absorption de rayonnements electromagnetiques a faible densite Expired - Lifetime EP0161245B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1983/001747 WO1985002265A1 (fr) 1983-11-07 1983-11-07 Composition a absorption de rayonnements electromagnetiques a faible densite

Publications (3)

Publication Number Publication Date
EP0161245A1 EP0161245A1 (fr) 1985-11-21
EP0161245A4 true EP0161245A4 (fr) 1986-04-15
EP0161245B1 EP0161245B1 (fr) 1990-07-25

Family

ID=22175559

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83903870A Expired - Lifetime EP0161245B1 (fr) 1983-11-07 1983-11-07 Composition a absorption de rayonnements electromagnetiques a faible densite

Country Status (7)

Country Link
EP (1) EP0161245B1 (fr)
JP (1) JPS61500338A (fr)
AU (1) AU562564B2 (fr)
DE (1) DE3381770D1 (fr)
DK (1) DK301185A (fr)
NO (1) NO167170C (fr)
WO (1) WO1985002265A1 (fr)

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2671368B2 (ja) * 1988-04-13 1997-10-29 株式会社リケン 磁気シールドシート
DE3900856A1 (de) * 1989-01-13 1990-07-26 Messerschmitt Boelkow Blohm Fassadenaufbau von hochbauten
CA2005198A1 (fr) * 1989-01-26 1990-07-26 Charles E. Boyer, Iii Absorbeur de micro-ondes a filaments metalliques magnetiques aciculaires
GB2269594B (en) * 1992-08-11 1995-08-30 Siemens Plessey Electronic Load material for use in microwave lenses
GB2308127A (en) * 1995-12-15 1997-06-18 Ams Polymers Radiation absorbing materials
IT1303021B1 (it) * 1998-04-17 2000-10-20 M M T S R L Dispositivo assorbitore di onde elettromagnetiche
FR2818445B1 (fr) * 2000-12-18 2003-03-07 Marie Claude Bonnabaud Dispositif de decouplage de resonance pour la protection du corps humain
JP5259096B2 (ja) * 2007-02-13 2013-08-07 浜松ホトニクス株式会社 ファイバオプティック及びその製造方法
WO2011140438A2 (fr) 2010-05-07 2011-11-10 Amphenol Corporation Connecteur de câble de haute performance
WO2012076764A2 (fr) * 2010-12-06 2012-06-14 Schultz, Christophe Technologie piezo gel - peinture pour eradiquer les pollutions electromagnetiques et les courants statiques
CN104704682B (zh) 2012-08-22 2017-03-22 安费诺有限公司 高频电连接器
CN121367083A (zh) 2014-01-22 2026-01-20 安费诺有限公司 电连接器、子组件、模块、线缆组件、电气组件及电路板
US10541482B2 (en) 2015-07-07 2020-01-21 Amphenol Fci Asia Pte. Ltd. Electrical connector with cavity between terminals
TWI790798B (zh) 2016-08-23 2023-01-21 美商安芬諾股份有限公司 可配置為高性能的連接器
CN208862209U (zh) 2018-09-26 2019-05-14 安费诺东亚电子科技(深圳)有限公司 一种连接器及其应用的pcb板
CN120767627A (zh) 2019-02-19 2025-10-10 安费诺有限公司 电连接器、用于电连接器的组件和电子系统
TW202534957A (zh) 2020-01-27 2025-09-01 美商Ｆｃｉ美國有限責任公司 高速及高密度之直接耦合垂直式連接器
TWI906252B (zh) 2020-01-27 2025-12-01 美商Ｆｃｉ美國有限責任公司 電連接器及其製造與操作方法、用於電連接器之子總成、包含電連接器的電子總成、纜線連接器、用於纜線連接器之子總成及連接器總成
CN111707895A (zh) * 2020-06-22 2020-09-25 合肥博雷电气有限公司 一种基于机器学习的电磁环境复杂度评估方法及系统
CN215816516U (zh) 2020-09-22 2022-02-11 安费诺商用电子产品(成都)有限公司 电连接器
CN213636403U (zh) 2020-09-25 2021-07-06 安费诺商用电子产品(成都)有限公司 电连接器
CN215266741U (zh) 2021-08-13 2021-12-21 安费诺商用电子产品(成都)有限公司 一种满足高带宽传输的高性能卡类连接器

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2610250A (en) * 1946-11-05 1952-09-09 Hazeltine Research Inc Electromagnetic-wave energyabsorbing material
US4024318A (en) * 1966-02-17 1977-05-17 Exxon Research And Engineering Company Metal-filled plastic material

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2544391A (en) * 1948-12-30 1951-03-06 Monsanto Chemicals Coating composition
US3843593A (en) * 1972-06-05 1974-10-22 Du Pont Radar absorptive coating composition of an acrylic polymer,a polyester and an isocyanate cross-linking agent
US3981844A (en) * 1975-06-30 1976-09-21 Ibm Stable emulsion and method for preparation thereof
JPS51163498U (fr) * 1976-06-09 1976-12-27
JPS54121047A (en) * 1978-03-13 1979-09-19 Tdk Corp Electric wave absorbing material
JPS54121046A (en) * 1978-03-13 1979-09-19 Tdk Corp Electric wave absorbing material
JPS5639080A (en) * 1979-09-08 1981-04-14 Nippon Shinyaku Co Ltd Benzisothiazole derivative
DE3024888A1 (de) * 1980-07-01 1982-02-04 Bayer Ag, 5090 Leverkusen Verbundmaterial zur abschirmung elektromagnetischer strahlung
US4663288A (en) * 1985-05-22 1987-05-05 Nabisco Brands, Inc. Process for purification of enzymes

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2610250A (en) * 1946-11-05 1952-09-09 Hazeltine Research Inc Electromagnetic-wave energyabsorbing material
US4024318A (en) * 1966-02-17 1977-05-17 Exxon Research And Engineering Company Metal-filled plastic material

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO8502265A1 *

Also Published As

Publication number Publication date
DK301185D0 (da) 1985-07-02
JPH0422325B2 (fr) 1992-04-16
AU562564B2 (en) 1987-06-11
NO167170C (no) 1991-10-09
EP0161245B1 (fr) 1990-07-25
DE3381770D1 (de) 1990-08-30
AU2340784A (en) 1985-06-03
NO167170B (no) 1991-07-01
JPS61500338A (ja) 1986-02-27
WO1985002265A1 (fr) 1985-05-23
DK301185A (da) 1985-07-02
EP0161245A1 (fr) 1985-11-21
NO852701L (no) 1985-07-04

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