Linerless pressure-sensitive adhesive tape having elastomeric backing

• US 3,876,454 A
• Filed: 03/28/1973
• Issued: 04/08/1975
• Est. Priority Date: 03/28/1973
• Status: Expired due to Term

• Current Assignee: Robert B. Snell, Smith W. Pierce
• Original Assignee: Robert B. Snell, Smith W. Pierce
• Inventors: Snell, Robert B., Smith, W. Pierce
• Primary Examiner(s): Lesmes, George F.
• Assistant Examiner(s): Roche, R. J.
• Application Number:
  US05/345,569
• Time in Patent Office: 741 Days
• Field of Search: 161/167 117/122P,122PF,122PA,226,68.5 206/59C 260/889 174/84R
• US Class Current: 428/336
• CPC Class Codes: A61L 15/42 Use of materials characterised by their function or physical properties liquid bandages A61L26/00
• CPC Class Codes: A61L 15/585 Mixtures of macromolecular compounds
• CPC Class Codes: C08L 23/06 Polyethene
• CPC Class Codes: C08L 23/12 Polypropene
• CPC Class Codes: C08L 23/20 having four to nine carbon atoms
• CPC Class Codes: C08L 33/04 Homopolymers or copolymers of esters C08L43/04 takes precedence
• CPC Class Codes: C09J 7/241 Polyolefin, e.g.rubber
• CPC Class Codes: Y10T 428/265 1 mil or less
• CPC Class Codes: Y10T 428/2874 including aldehyde or ketone condensation polymer [e.g., urea formaldehyde polymer, melamine formaldehyde polymer, etc.]
• CPC Class Codes: Y10T 428/2891 including addition polymer from alpha-beta unsaturated carboxylic acid [e.g., acrylic acid, methacrylic acid, etc.] Or derivative thereof
• CPC Class Codes: Y10T 428/2936 Wound or wrapped core or coating [i.e., spiral or helical]
• CPC Class Codes: Y10T 428/31935 Ester, halide or nitrile of addition polymer

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.

Claims

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

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.

3. The composition of claim 2 wherein the thermoplastic resin is polyethylene.