Insulating tape

Claim 1

A PRESSURE-SENSITIVE ADHESIVE INSULATING TAPE WOUND UPON ITSELF IN ROLL FORM AND COMPRISED OF: A STRETCHABLE AND ELASTIC FILM BACKING HAVING A THICKNESS OF 4 TO 20 MILS AND FORMED OF A HOMOGENEOUS MIXTURE PRIMARILY CONSISTING OF A STABLE BLEND OF A FILM-FORMING POLYMER OF MONOMERS INCLUDING AT LEAST A MAJOR PROPORTION OF VINYL CHLORIDE, A SUBSTANTIALLY NON-VOLATILE LIQUID PHTHALYL ESTE PLASTICIZER AMOUNTING TO 8 TO 20 PARTS PER 100 PARTS OF SAID POLY-MER, AND A SOFT AND VISCOUS LOW-ACID-NUMBER ALKYD PLASTICIZER RESIN IN AMOUNT AT LEAST EQUAL TO THE AMOUNT OF SAID LIQUID PHTHALYL ESTER PLASTIKCIZER, THE TOTAL AMOUNT OF SAID PLASTICIZERS BEING ABOUT 1/3 TO 1/2 THE AMOUNT OF SAID POLYMER AND THE PROPORTIONS BEING SUCH THAT THE ADHEXIVE TAPE HAS THE PROPERTIES OF STRETCH AND ELASTICITY HEREAFTER SPECIFIED WITHOUT CAUSING PASTINESS OR TACK-LOSS OF THE CONTACTING ADHESIVE IN THE ROLL; AND A EUCOHESIVE NORMALLY TACKY AND PRESSURE-SENSITIVE RUBBER-RESIN TYPE ADHESIVE COATING UNITED TO THE INNER FACE OF SAID FILM BACKING; SAID ADHESIVE TAPE BEING UNWINDABLE WITHOUT DELAMINATION OF OFFSETTING OF ADHESIVE, BEING ORIGINALLY STRETCHABLE BY HAND-PULLING TO AN EXTENT OF AT LEAST 50% AT ROOM TEMPERATURE AND BEING SUBSTANTIALLY COMPLETELY RETRACTABLE FROM AN ELONGATION OF 30% AS HEREIN SPECIFIED.