Heated floor mat

Claim 1

An integral electrically heated floor mat comprised of outer conductive and electrically non-conductive layers and an inner-electrically resistive layer, said inner layer having parallel spaced flexible electrodes enclosed therein and conductively bonded thereto, the outer layers each consisting essentially of styrene butadiene rubber and inert materials in an amount of 1 part rubber to 2 to 4 parts by weight inert material, and a thermosetting resin, 1 part rubber to 0.3 to 0.5 parts by weight thermosetting resin; the inner layer consisting essentially of a rubber selected from the group consisting of epichlorohydrin-ethylene oxide copolymer rubber, butyl rubber, neoprene rubber and silicone rubber and combinations thereof, a plasticizer and carbon black, 1 part rubber to 0.7 to 1.3 parts by weight carbon black, 1 part rubber to 0.7 to 1.3 parts by weight plasticizer; the inner and outer layers being sealed to each other and the inner layer being sealed inside the outer layer; and a thermostatically controlled current receiving means in electrical communication with the electrodes, said means having a switch in a normally closed position to conduct electrical current to the electrodes, the switch adapted to move to an open position when a predetermined temperature is reached whereby current may be transmitted through portions of the inner electrically resistive layer lying between the said electrodes to generate heat.