A separable layer of permanently thermoplastic bonding material made by extrusion lamination comprises a mixture of

i) silicone-modified low density polyethylene (LDPE); and

ii) polyolefin which is adherent in state of plastic flow.

In the laminate, a backing layer and a top layer are laminated together therewith. The laminate is produced either by flat sheet monoextrusion or flat sheet coextrusion of the bonding material.