Linerless pressure-sensitive adhesive tape having elastomeric backing
First Claim
1. A LINERLESS ELECRICALLY INSULATING TAPE WHICH HAS IMMEDIATE ADHESION TO INSULATION AND METAL CONDUCTOR SURFACES YET CAN BE WOUND UPON ITSELF AND STORED IN ROLL FORM FOR PROLONGED PERIODS AND CAN THEREAFTER BE UNWOUND WITHOUT DAMAGE THERETO, CONSISTING ESSENTIALLY OF IN COMBINATION, AN ELASTOMERIC BACKING SHEET HAVING A THICKNESS IN THE RANGE OF ABOUT 4 TO 50 MILS AND A TENSILE STRENGTH OF AT LEAST 200 POUNDS PER SQUARE INCH AND, COEXTENSIVE WITH AND FIRMLY UNITED TO ONE MAJOR SURFACE OF THE BACKING SHEET, A LAYER AT LEAST 0.4 MIL IN THICKNESS OF PRESSURE-SENSITIVE ELASTOMERIC ACRYLATE ESTER COPOLYMER ADHESIVE, SAID ELASTOMES BEING PHYSICALLY INCOMPATIBLE, SAID ADHESIVE HAVING ADHESION TO STEEL OF AT LEAST 3 OUNCES PER INCH WIDTH, SAID BACKING SHEET AND SAID ADHESIVE BEING SELECTED TO PROVIDE A STRIPPING DISTANCE OF GREATER THAN 1 INCH AND AN ELONGATION OF LESS THAN 100% WHEN A ONE INCH WIDE STRIP OF SAID BACKING SHEET, ADHERED UNDER PRESSURE OF A
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Abstract
Pressure-sensitive tapes having an elastomeric backing coated on one major surface with normally tacky pressure-sensitive adhesive provide an insulating material which has immediate adhesion to electrical conductors and can be wound thereabout to provide an insulating sheath having high resistance to electrical loss. The tape can be wound upon itself in roll form and thereafter easily dispensed without the use of a barrier layer such as a liner or a low adhesion backsize coating.
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Citations
3 Claims
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1. A LINERLESS ELECRICALLY INSULATING TAPE WHICH HAS IMMEDIATE ADHESION TO INSULATION AND METAL CONDUCTOR SURFACES YET CAN BE WOUND UPON ITSELF AND STORED IN ROLL FORM FOR PROLONGED PERIODS AND CAN THEREAFTER BE UNWOUND WITHOUT DAMAGE THERETO, CONSISTING ESSENTIALLY OF IN COMBINATION, AN ELASTOMERIC BACKING SHEET HAVING A THICKNESS IN THE RANGE OF ABOUT 4 TO 50 MILS AND A TENSILE STRENGTH OF AT LEAST 200 POUNDS PER SQUARE INCH AND, COEXTENSIVE WITH AND FIRMLY UNITED TO ONE MAJOR SURFACE OF THE BACKING SHEET, A LAYER AT LEAST 0.4 MIL IN THICKNESS OF PRESSURE-SENSITIVE ELASTOMERIC ACRYLATE ESTER COPOLYMER ADHESIVE, SAID ELASTOMES BEING PHYSICALLY INCOMPATIBLE, SAID ADHESIVE HAVING ADHESION TO STEEL OF AT LEAST 3 OUNCES PER INCH WIDTH, SAID BACKING SHEET AND SAID ADHESIVE BEING SELECTED TO PROVIDE A STRIPPING DISTANCE OF GREATER THAN 1 INCH AND AN ELONGATION OF LESS THAN 100% WHEN A ONE INCH WIDE STRIP OF SAID BACKING SHEET, ADHERED UNDER PRESSURE OF A
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2. The tape of claim 1 wherein said 100 parts of elastomer consists of 25-75 parts of an ethylene propylene copolymer and the balance is an isobutylene polymer.
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3. The composition of claim 2 wherein the thermoplastic resin is polyethylene.
Specification