Two ply thermal paper and method of making

Claim 1

A method of forming a two ply thermal paper comprising the steps of: providing a base sheet of bond paper; coating the base sheet with a thermoreactive layer essentially consisting of a thermochromic color forming dye of about 8 to 12%, a temperature modifying, saturated fatty alcohol of about 10 to 15%, a bisphenol of about 20 to 35%, a fluorescent brightener of about 1 to 2%, a filler of about 25 to 35%, and a binder of polyvinyl alcohol applied on one surface of the base sheet, laminating a top sheet of tissue-type paper to the base sheet within a fraction of a second of time while the thermoreactive layer is in a wet condition for adhering the two sheets, drying the laminated sheets, coating the top sheet with a thermoreactive layer essentially consisting of a thermochromic color forming dye of about 5 to 7%, a synthetic wax of about 10 to 15%, a bisphenol of about 18 to 25%, an amide wax of about 4 to 6%, a white pigment of about 1 to 4%, an anti-stick agent of about 1 to 3%, a filler of about 28 to 40%, and a binder of polyvinyl alcohol applied on one surface of the top sheet, and drying the coating on the top sheet.

Claim 2

A method of forming a two ply thermal paper comprising the steps of: providing a base sheet of bond paper; coating the base sheet with a thermoreactive layer essentially consisting of a thermochromic color forming dye of about 8 to 12%, a temperature modifying, saturated fatty alcohol of about 10 to 15%, a bisphenol of about 20 to 35%, a fluorescent brightener of about 1 to 2%, a filler of about 25 to 35%, and a binder of polyvinyl alcohol applied on one surface of the base sheet, laminating a top sheet of tissue-type paper to the base sheet within a fraction of a second of time while the thermoreactive layer is in a wet condition for adhering the two sheets, drying the laminated sheets, coating the top sheet with a thermoreactive layer essentially consisting of a thermochromic color forming dye of about 5 to 7%, a synthetic wax of about 10 to 15%, a bisphenol of about 18 to 25%, an amide wax of about 4 to 6%, a white pigment of about 1 to 4%, an anti-stick agent of about 1 to 3%, a filler of about 28 to 40%, and a binder of polyvinyl alcohol applied on one surface of the top sheet, and drying the coating on the top sheet.

Claim 5

A method of forming a heat sensitive copy system for use with thermal printing means comprising the steps of: providing a first sheet of bond paper, coating the first sheet with a thermoreactive layer essentially consisting of a thermochromic color forming dye of about 8 to 12%, a bisphenol of about 37 to 48%, a temperature modifying hydroxy cyclic compound of about 14 to 21%, an amide wax of about 7 to 10%, a fluorescent brightener of about 1%, a filler of about 7 to 10%, and a binder of polyvinyl alcohol applied on one surface of the first sheet, laminating a second sheet of tissue-type paper to the first sheet within a fraction of a second of time while the thermoreactive layer is in a wet condition for adhering the two sheets, dyring the laminated sheets, coating the second sheet with a layer essentially consisting of a thrmochromic color forming dye of about 5 to 7%, a bisphenol of about 18 to 25%, a synthetic wax of about 10 to 15%, an amide wax of about 4 to 6%, a white pigment of about 1 to 4%, an anti-stick agent of about 1 to 3%, a filler of about 28 to 40%, and a binder of polyvinyl alcohol applied on one surface of the second sheet, and drying the coating on the second sheet.

Claim 6

A method of forming a heat sensitive copy system for use with thermal printing means comprising the steps of: providing a first sheet of bond paper, coating the first sheet with a thermoreactive layer essentially consisting of a thermochromic color forming dye of about 8 to 12%, a bisphenol of about 37 to 48%, a temperature modifying hydroxy cyclic compound of about 14 to 21%, an amide wax of about 7 to 10%, a fluorescent brightener of about 1%, a filler of about 7 to 10%, and a binder of polyvinyl alcohol applied on one surface of the first sheet, laminating a second sheet of tissue-type paper to the first sheet within a fraction of a second of time while the thermoreactive layer is in a wet condition for adhering the two sheets, dyring the laminated sheets, coating the second sheet with a layer essentially consisting of a thrmochromic color forming dye of about 5 to 7%, a bisphenol of about 18 to 25%, a synthetic wax of about 10 to 15%, an amide wax of about 4 to 6%, a white pigment of about 1 to 4%, an anti-stick agent of about 1 to 3%, a filler of about 28 to 40%, and a binder of polyvinyl alcohol applied on one surface of the second sheet, and drying the coating on the second sheet.