Printed heater elements integrated in construction materials

A construction element comprising,

• a) a construction material;
• b) a heating element comprising a positive temperature coefficient (PTC) composition layer, wherein said PTC composition layer comprises:
• an electronically conductive material;
• a semi-crystalline material;
• a first binder;
• a second binder;
• and
• a solvent;
• c) an adhesion layer applied to said heating element;
• d) a substrate adhered to said adhesion layer, said heating element and said adhesion layer being embedded between said construction material and said substrate;
• and
• e) a connector connected to the heating element,
• wherein the semi-crystalline material is selected from the group consisting of polyethylene, polypropylene, polyvinyls, nylon, polyethylene terephthalate, polybutylene terephthalate, polyoxymethylene, natural polymers, refined hydrocarbon waxes and mixtures thereof,
• wherein the first binder is selected from the group consisting of thermoplastic polyurethanes, polyacrylates, polysiloxanes, halogenated vinyl or vinylidene polymers, polyketones, polyvinyl pyrrolidone, and mixtures thereof;
• wherein the second binder is selected from the group consisting of ethylene vinyl acetate polymers, ethylene alkyl acrylate copolymers and mixtures thereof;
• and
• wherein the solvent is selected from the group consisting of ketones, esters, glycol esters, glycol ethers and mixtures thereof or from the group consisting of butyl glycol acetate, carbitol acetate and mixtures thereof.