초록 ▼

An elongate heater (1) in which a resistive heating element core is surrounded by a first insulating jacket (9) and a second insulating jacket (11). In a preferred embodiment the resistive heating element core comprises a conductive polymer composition (3) and the heater passes the VW-1 flame test.

An elongate heater (1) in which a resistive heating element core is surrounded by a first insulating jacket (9) and a second insulating jacket (11). In a preferred embodiment the resistive heating element core comprises a conductive polymer composition (3) and the heater passes the VW-1 flame test. The second insulating jacket (11) may be made from the same material as the first insulating jacket (9). For some applications it is preferred that the second insulating jacket be a thin film, e.g. polyester film.

대표청구항 ▼

[ What is claimed is:] [1.] An elongate heater which passes the VW-1 flame test and which comprises(1) a core which comprises a resistive heater element which comprises a conductive polymer composition which exhibits PTC behavior;(2) a first insulating jacket which(a) surrounds the core, and(b) is c

[ What is claimed is:] [1.] An elongate heater which passes the VW-1 flame test and which comprises(1) a core which comprises a resistive heater element which comprises a conductive polymer composition which exhibits PTC behavior;(2) a first insulating jacket which(a) surrounds the core, and(b) is composed of a first insulating material comprising an organic polymer; and(3) a second insulating jacket which surrounds and contacts the first insulating jacket; components of the heater being such that (a) a heater which is substantially identical, except that it does not contain the second insulating jacket, fails the VW-1 flame test, and (b) a heater which is substantially identical, except that it does not contain the first insulating jacket, fails the VW-1 flame test.