Transparent friction surface sheet material

Claim 1

A friction surface sheet material capable of being adherently attached to the surface of a substrate of the type which may have an ornamental pattern on said surface and which sheet material, when attached to said surface, permits visual observation of said pattern therethrough, said sheet material comprising: (1) a transparent backing layer formed of a dimensionally stable, biaxially oriented, transparent polymeric film having an upper and a lower major surface; (2) a first coating of a first tough transparent binder material having an elongation of at least 40% and a tensile strength of at least 1000 psi adherently bonded to said upper major surface; (3) a second coating of a second tough transparent binder material useful for pedestrian traffic and having an elongation of at least 40% and a tensile strength of at least 1000 psi adherently bonded to the exposed surface of said first coating of said first transparent binder material; (4) a multitude of minute transparent glass particles no larger than 10 Tyler mesh and capable of withstanding pedestrian traffic without significant fracture uniformly distributed over said upper major surface and firmly adherently bonded thereto by said first and said second transparent binder materials with a combined thickness of said binder materials which is sufficient to substantially prevent particle loss under pedestrian use, with the tops of said glass particles projecting above the exposed surface of said second coating to provide a friction surface; and (5) a layer of transparent pressure-sensitive adhesive material over the bottom surface of said backing layer to facilitate attachment of said friction surface material to a substrate.