(19)
(11) EP 0 242 952 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
17.05.1989 Bulletin 1989/20

(43) Date of publication A2:
28.10.1987 Bulletin 1987/44

(21) Application number: 87301481.5

(22) Date of filing: 20.02.1987
(51) International Patent Classification (IPC)4: H05B 6/64
(84) Designated Contracting States:
BE CH DE FR GB IT LI LU NL SE

(30) Priority: 21.02.1986 US 832287
23.01.1987 US 2980

(71) Applicant: E.I. DU PONT DE NEMOURS AND COMPANY
Wilmington Delaware 19898 (US)

(72) Inventors:
  • Huang, Hua-Feng
    Mendenhall Pennsylvania 19317 (US)
  • Plorde, Donald Edward
    Midlothian Virginia 23113 (US)

(74) Representative: Jones, Alan John et al
CARPMAELS & RANSFORD 43 Bloomsbury Square
London, WC1A 2RA
London, WC1A 2RA (GB)


(56) References cited: : 
   
       


    (54) Composite material containing microwave susceptor materials


    (57) A composite material useful for controlled generation of heat by absorption of microwave energy is disclosed. The material comprises a dielectric substrate, e.g., polyethylene terephthalate film, coated with a mixture of an electrically conductive metal or metal alloy in flake form in a thermoplastic dielectric matrix, e.g., a polyester copolymer. In a preferred embodiment, the coating of flake/thermoplastic is applied so as to yield an isotropic coating with good heating performance reproducibility. The use of circular flakes with flat surfaces and smooth edges contributes substantially to good heating performance reproducibility.






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