Printable Magnetic Receptive Composite Sheet and Method of Making
Composite sheets are made by calendering thin layers of magnetic compositions and bonding to a top printable layer wherein the calendered layer has thickness up to 10 mils.
1 . A printable magnetic receptive composite sheet comprising:
a calendered magnetic layer containing a thermoplastic binder and a magnetic material and;
a printable top layer bonded to said calendered layer, wherein said calendered magnetic layer has a thickness up to 10 mils.
2 . The sheet of claim 1 wherein said calendered magnetic layer has a thickness from about 6 to 10 mils.
3 . The sheet of claim 1 wherein said printable top layer is a substrate selected from the group of a polymeric material, cotton, textile or a paper product.
4 . The sheet of claim 3 having an indefinite length and a width of up to about 60 inches with a total thickness of up to about 20 mils.
5 . The sheet of claim 3 wherein the polymeric material is a thermoplastic polymer.
6 . The sheet of claim 5 wherein said polymer is a polyester.
7 . The sheet of claim 6 wherein the polyester is polyethylene terephthalate.
8 . The sheet of claim 3 wherein said printable top layer has a surface with printable coating deposited thereon.
9 . The sheet of claim 8 wherein said printable coating has a silicon dioxide or a titanium oxide pigment dispersed in a polymeric binder selected from the group of a water-based polyurethane, water-based ethylene vinyl acetate polymer and polyacrylic emulsion.
10 . The sheet of claim 1 wherein the said thermoplastic binder is a polymer with a monomeric group of an olefin, vinyl halide and vinyl acetate, and copolymers thereof.
11 . The sheet of claim 1 wherein the thermoplastic binder is a chlorinated polyethylene, ethylene vinyl acetate, or polyolefin elastomer, and mixtures thereof.
12 . The sheet of claim 1 wherein the calendered magnetic layer is bonded to the printable top layer with the aid of an adhesive.
13 . The sheet of claim 1 wherein said calendered magnetic sheet contains an anaerobic prodegradant.
14 . The sheet of claim 13 wherein said anaerobic prodegradant is a monomeric adduct of an organotitanate or organozirconate.
15 . A method of making a printable composite magnetic receptive sheet having multiple layers comprising:
calendering a thermoplastic composition containing a thermoplastic binder and a magnetic material into a continuous magnetic layer having a thickness up to 10 mils and;
laminating a printable top layer onto said magnetic layer.
16 . The method of claim 15 conducted at an elevated temperature for laminating the magnetic layer to said printable top layer.
17 . The method of claim 15 wherein the lamination is conducted with the aid of an adhesive selected from the group of water-based polyurethane and water-based EVA.
18 . The method of claim 15 wherein the said thermoplastic binder is a polymer having the monomeric group of an olefin, vinyl halide and vinyl acetate, and copolymers thereof.
19 . The method of claim 15 wherein said printable top layer is a substrate selected from the group of a polymeric material, cotton, textile or a paper product.
20 . The method of claim 15 wherein said printable top layer has a surface with a printable coating deposited thereon.
21 . The method of claim 15 said printable coating has a silicon dioxide or a titanium oxide pigment dispersed in a polymeric binder selected from the group of a water-based polyurethane, water-based ethylene vinyl acetate polymer and polyacrylic emulsion.