EP 1236208 A1 20020904 - ELECTRICALLY CONDUCTIVE EXOTHERMIC COATINGS
Title (en)
ELECTRICALLY CONDUCTIVE EXOTHERMIC COATINGS
Title (de)
ELEKTRISCH LEITENDE EXOTHERMISCHE BESCHICHTUNG
Title (fr)
REVETEMENTS EXOTHERMIQUES ELECTROCONDUCTEURS
Publication
Application
Priority
US 9921701 W 19990920
Abstract (en)
[origin: WO0122434A1] The present invention is based on the discovery that different carbon components are required in an electrically conductive exothermic coating in order to avoid break-down and especially if a constant temperature is to be maintained by the coating (self-regulating embodiment). It has been discovered that graphite permits heat to be generated by the coating when energized with a.c. power; however, the heat tends to run away which results in a break down of the coating. Carbon, on the other hand, permits more electrical conductivity by the coating. Both the graphite and carbon should be flake-like in structure. Such a combination of flake-like graphite and carbon pigments in particles sizes of about 5 mu to 500 mu should be used. The amount of such pigments should range from about 10 and 20 weight-% based on the non-volatile solids content of the coating formulation (e.g., without solvent and other components that evolve from the coating during drying and curing operations). In order to make a self-regulating coating (i.e., a coating that will maintain a constant temperature without breakdown), non-conductive flake-like graphite pigment should be added to the formulation. In order to increase the heat emitted by the novel coatings, additional conventional spherical carbon (up to a 1/3 replacement of the flake-like particle content) can be added to the formulation.
IPC 1-7
IPC 8 full level
H01B 1/24 (2006.01)
CPC (source: EP)
C04B 28/04 (2013.01); C04B 28/14 (2013.01); H01B 1/24 (2013.01); C04B 2111/94 (2013.01)
Citation (search report)
See references of WO 0122434A1
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
WO 0122434 A1 20010329; AU 6255599 A 20010424; EP 1236208 A1 20020904
DOCDB simple family (application)
US 9921701 W 19990920; AU 6255599 A 19990920; EP 99949740 A 19990920