Magnetic identification label tape and method

Claim 1

A tape for labeling vulcanizable rubber articles such as vehicle tires, said tape comprising a flexible temporary carrier web having a low-adhesion surface and a detachable label adhered thereto, which label comprises (a) a flexible, non-porous substantially uniformly thick backing of polyimide or biaxially oriented polyester which has a thickness within the range of 10 to 100 micrometers, and which will during molding operations withstand vulcanization temperatures and pressure without appreciable dimensional change, (b) an adhesion promoting primer of substantially uniform thickness on one surface of the backing, said primer having a dry coating weight within the range of 0.1 to 3 grams/meter 2 , (c) a substantially uniformly thick layer of pressure sensitive adhesive, the dry coating weight of which is within the range of 6 to 45 grams/meter 2 , permanently adhered via the adhesion promoting primer to one surface of said backing and releasably adhered to said low-adhesion surface of said carrier web, and (d) a substantially uniformly thick magnetic recording layer secured to the other surface of the backing, which recording layer is less than 50 micrometers thick, comprises a major proportion by weight of magnetizable particles and a minor proportion of a polymeric binder and has a remanent flux of at least 0.4 maxwells per cm of width, the characteristics of said label enabling a magnetic code to be recorded thereon prior to the application thereof to a said vulcanizable rubber article such that it becomes securely bonded to the article during vulcanization, and further enabling the recorded magnetic code to be readily detected after vulcanization.

Claim 12

The method of making a roll of label tape suitable for providing vulcanizable rubber articles with labels which are adapted for being unwound from roll form in condition for printing, a magnetic code recorded thereon and applied to vulcanizable rubber articles, whereupon during vulcanization the label becomes securely bonded to the article and subsequent to said vulcanization the recorded magnetic code may readily be detected, said method comprising the steps of (a) providing a flexible, non-porous substantially uniformly thick backing of polyimide or biaxially oriented polyester which has a thickness within the range of 10 to 100 micrometers, and which will withstand the vulcanization temperatures and pressures present during molding operations without appreciable dimensional change, (b) applying to one surface of said backing a substantially uniform layer of adhesion promoting primer to provide a dry thickness thereof ranging in thickness between 0.1 and 3 grams/meter 2 , (c) providing a flexible temporary carrier web having a low-adhesion surface, (d) applying a pressure sensitive adhesive to said adhesion promoting primer and to said low-adhesion surface, which pressure sensitive adhesive is capable of forming a strong bond to a vulcanizable rubber article when the article is vulcanized in contact with the pressure sensitive adhesive, (e) applying to the other surface of said backing a uniformly thick magnetizable layer, the thickness of which magnetizable layer is less than 50 micrometers, which comprises a major proportion by weight of magnetizable particles and a minor proportion of a polymeric binder and which has a remanent flux of at least 0.4 maxwells/cm of width so as to be useful as a magnetic recording layer, and (f) winding the thus prepared backing into roll form.

Claim 13

The method of making a roll of label tape suitable for providing vulcanizable rubber articles with labels which are adapted for being unwound from roll form in condition for printing, a magnetic code recorded thereon and applied to vulcanizable rubber articles, whereupon during vulcanization the label becomes securely bonded to the article and subsequent to said vulcanization the recorded magnetic code may readily be detected, said method comprising the steps of (a) providing a flexible, non-porous substantially uniformly thick backing of polyimide or biaxially oriented polyester which has a thickness within the range of 10 to 100 micrometers, and which will withstand the vulcanization temperatures and pressures present during molding operations without appreciable dimensional change, (b) applying to one surface of said backing a substantially uniform layer of adhesion promoting primer to provide a dry thickness thereof ranging in thickness between 0.1 and 3 grams/meter 2 , (c) providing a flexible temporary carrier web having a low-adhesion surface, (d) applying a pressure sensitive adhesive to said adhesion promoting primer and to said low-adhesion surface, which pressure sensitive adhesive is capable of forming a strong bond to a vulcanizable rubber article when the article is vulcanized in contact with the pressure sensitive adhesive, (e) applying to the other surface of said backing a uniformly thick magnetizable layer, the thickness of which magnetizable layer is less than 50 micrometers, which comprises a major proportion by weight of magnetizable particles and a minor proportion of a polymeric binder and which has a remanent flux of at least 0.4 maxwells/cm of width so as to be useful as a magnetic recording layer, and (f) winding the thus prepared backing into roll form.

Claim 17

The method of making a roll of label tape suitable for providing vulcanizable rubber articles with label markings which become permanent after vulcanization and which are adapted for being unwound from roll form in condition for printing a magnetic code recorded thereon and applied to vulcanizable rubber articles whereupon during vulcanization the label becomes securely bonded to the article and subsequent to said vulcanization the recorded code may readily be detected, said method comprising the steps of (a) providing a flexible, non-porous substantially uniformly thick backing of biaxially oriented polyethylene terephthalate, which has a thickness between the range of 10 to 100 micrometers, and which will withstand the vulcanization temperatures and pressures without appreciable dimensional change, (b) applying to one surface of said backing an adhesive promoting primer comprising a solution of crude rubber and solvent therefor, drying said primer by evaporating the solvent therefrom, and improving the bond of said dried primer to said backing by exposure to UV light to provide a primer layer having a dry coating weight in the range of 0.1 to 3 grams/meter 2 , (c) applying to the exposed surface of said primer layer a solution of latex crepe and a suitable solvent therefor, and drying same to remove the solvent therefrom to provide a pressure sensitive adhesive layer having a dry coating weight ranging between 6 to 45 grams/meter 2 , (d) adhering a low-adhesion surface of the carrier web to said pressure sensitive adhesive layer, (e) coating the opposite surface of said backing with a dispersion of a magnetic pigment, binder, cross-linking agents and suitable solvents, longitudinally orienting the magnetic pigment, and drying the magnetic dispersion to provide a layer of magnetic particles and binder having a thickness of less than 50 micrometers, which comprises a major proportion by weight of magnetizable particles and a minor proportion of a polymeric binder and which has a remanent flux of at least 0.4 maxwells per cm of width, and (f) winding the thus prepared backing into roll form.

Claim 18

The method of making a roll of label tape suitable for providing vulcanizable rubber articles with label markings which become permanent after vulcanization and which are adapted for being unwound from roll form in condition for printing a magnetic code recorded thereon and applied to vulcanizable rubber articles whereupon during vulcanization the label becomes securely bonded to the article and subsequent to said vulcanization the recorded code may readily be detected, said method comprising the steps of (a) providing a flexible, non-porous substantially uniformly thick backing of biaxially oriented polyethylene terephthalate, which has a thickness between the range of 10 to 100 micrometers, and which will withstand the vulcanization temperatures and pressures without appreciable dimensional change, (b) applying to one surface of said backing an adhesive promoting primer comprising a solution of crude rubber and solvent therefor, drying said primer by evaporating the solvent therefrom, and improving the bond of said dried primer to said backing by exposure to UV light to provide a primer layer having a dry coating weight in the range of 0.1 to 3 grams/meter 2 , (c) applying to the exposed surface of said primer layer a solution of latex crepe and a suitable solvent therefor, and drying same to remove the solvent therefrom to provide a pressure sensitive adhesive layer having a dry coating weight ranging between 6 to 45 grams/meter 2 , (d) adhering a low-adhesion surface of the carrier web to said pressure sensitive adhesive layer, (e) coating the opposite surface of said backing with a dispersion of a magnetic pigment, binder, cross-linking agents and suitable solvents, longitudinally orienting the magnetic pigment, and drying the magnetic dispersion to provide a layer of magnetic particles and binder having a thickness of less than 50 micrometers, which comprises a major proportion by weight of magnetizable particles and a minor proportion of a polymeric binder and which has a remanent flux of at least 0.4 maxwells per cm of width, and (f) winding the thus prepared backing into roll form.