Pressure-sensitive adhesive tape with antistatic primer coating

Claim 1

A PRESSURE-SENSITIVE ADHESIVE TAPE WOUND UPON ITSELF IN ROLL FORM AND HAVING A WATER-INSOLUBLE HYDROPHOBIC INSULATIVE VISCOELASTIC NORMALLY AND AGGRESSIVELY TACKY PRESSURE-SENSITIVE ADHESIVE COATING FIRMLY UNITED BY AN INTERPOSED PRIMER COATING TO A HYDROPHOBIC INSULATIVE FILM BACKING HAVING A HYDROPHOBIC INSULATIVE BACK SURFACE IN REMOVABLE ADHERENT CONTACT WITH THE OUTER SURFACE OF SAID ADHESIVE COATING INTHE WOUND ROLL, SUCH THAT REMOVAL OF A PIECE OF TAPE TENDS TO CAUSE OBJECTIONABLE ELECTROSTATIC CHAGING THEREOF, SAID INTERPOSED PRIMER COATING PROVIDING ANTISTATIC MEANS TO PREVENT OBJECTIONABLE STATIC N IECES OF TAPE UNWOUND FROM THE ROLL AND BEIN FORMED OF AN EXTREMELY THIN COATING OF A RESILIENT HIGHLY-COHESIVE POLYMERIC FILM COMPOSITION ADAPTED TO PROVIDE A STRONG BOND BETWEEN THE BACKING FILM AND THE ADHESIVE COATING AND INCLUDING A HYDROPHILIC FILM-FORMING IONOGENIC POLYMER ADAPTED TO PROVIDE IONIC CONDUCTIVITY AND TO MAINTAIN AN ADEQUATE BUT NOT EXCESSIVE MOISTURE CONTENT WHEN THE TAPE ROLL IS EXPOSED TO AN ATMOSPHERE HAVING A RELATIVE HUMIDITY OF AT LEAST 20%, SAID IONOGENIC POLYMER BEING SELECTED AND PROPORTIONED TO PROVIDE SAID PRIMER COATING WITH AN ELECTRICAL RESISTIVITY OF THE ORDER OF NOT MORE THAN 10**10 OHMS PER SQUARE WHEN MEASURED IN EQUILIBRIUM WITH AIR HAVING A 50% RELATIVE HUMIDITY, BUT WITHOUT IMPAIRMENT OF THE BLONDNG FUNCTION OF THE PRIMER COATING.