Adhesive tape

Patent metadata

Field	Value
Publication number	US-2016347973-A1
Application number	US-201515117577-A
Country	US
Kind code	A1
Filing date	Feb 9, 2015
Priority date	Feb 10, 2014
Publication date	Dec 1, 2016
Grant date	—

Abstract

Disclosed is an adhesive tape comprising a carrier consisting of a foil, to one side of which an adhesive substance is applied. The adhesive substance contains a polyisoprene rubber and one or more adhesive resins, the weight ratio of the rubber to the adhesive resin being greater than 1.10. A silicone-based separating agent is applied to the side of the carrier that is not provided with the adhesive substance.

First claim

1 . An adhesive tape comprising a carrier comprising a film, said adhesive tape having a first and a second side, and an adhesive is applied to the first side, wherein
the adhesive comprises a polyisoprene rubber and one or more tackifier resins, the rubber:tackifier resin weight ratio is greater than 1.10, and a silicone-based release agent is applied to the second side.

2 . The adhesive tape of claim 1 , wherein the film is a monoaxially oriented film which comprises at least 50 wt % of a polypropylene homopolymer and 10 to 25 wt % of a copolymer of ethylene, and 2 to 6 mol % of an α-olefin, the α-olefin being a diene having at least four carbon atoms.

3 . The adhesive tape of claim 1 , wherein the polypropylene homopolymer comprises granules whose only polymer is polypropylene.

4 . The adhesive tape of claim 1 , wherein the film comprises 55 to 80 wt % of a polypropylene homopolymer, 10 to 25 wt % of a copolymer of ethylene and 2 to 6 mol % of an α-olefin, and 10 to 20 wt % of an ethylene-propylene rubber (EPR).

5 . The adhesive tape of claim 1 , wherein a draw ratio on orientation of an extruded primary film in machine direction is 1:5 to 1:9.

6 . The adhesive tape of claim 1 , wherein a film thickness after orientation is between 40 and 150 μm.

7 . The adhesive tape of claim 1 , wherein the rubber:tackifier resin weight ratio is between 1.10 and 1.60.

8 . The adhesive tape of claim 1 , wherein the polyisoprene rubber is a natural rubber.

9 . The adhesive tape of claim 1 , wherein Mooney viscosity (condition 1+4, 125° C.) of the polyisoprene rubber is between 50 and 110.

10 . The adhesive tape of claim 1 , wherein the adhesive is made from natural rubbers, or a blend of natural rubbers and synthetic rubbers.

11 . The adhesive tape of claim 1 , wherein the silicone-based release agent located on the second side is selected from the group consisting of silicone, fluorinated silicone, silicone copolymers and mixtures of two or more of the stated substances.

12 . The adhesive tape of claim 1 , wherein the silicone-based release agent comprises crosslinkable silicone systems.

13 . The adhesive tape of claim 12 , wherein the silicone system comprises an addition-crosslinking silicone system comprising a mixture of a polydimethylsiloxane functionalized with vinyl groups, a methylhydrogenpolysiloxane, and a platinum catalyst.

14 . The adhesive tape of claim 1 , wherein the tackifier resins are resins comprising hydrogenated, partially hydrogenated or unhydrogenated hydrocarbon resins, terpene-phenols, or rosin esters.

15 . A method for securing movable parts on printers, copiers, household appliances, electric and gas ovens, and furniture, or for bundling and palletizing cardboard-boxed items, said method comprising a step of applying the adhesive tape of claim 1 .

16 . (canceled)

17 . The adhesive tape of claim 1 , wherein the film comprises at least 50 wt % of a polypropylene homopolymer and 15 wt % of a copolymer of ethylene, and 2 to 6 mol % of an α-olefin, the α-olefin being a diene having at least four carbon atoms.

18 . The adhesive tape of claim 1 , wherein the film comprises at least 50 wt % of a polypropylene homopolymer and 10 to 25 wt % of a copolymer of ethylene, and 2 to 6 mol % of an α-olefin, the α-olefin being a diene selected from the group consisting of butene, hexene and octene.

19 . The adhesive tape of claim 5 , wherein the draw ratio is 1:6 to 1:7.5.

20 . The adhesive tape of claim 6 , wherein the film thickness is between 50 and 100 μm.

21 . The adhesive tape of claim 47 , wherein the rubber:tackifier resin weight ratio is between 1.30 and 1.50.

Assignees

• Tesa Se

Inventors

• Lange Frank
• Urban Tanja

Classifications

• C09J7/401

  characterised by the release coating composition · CPC title

• C09J2423/106

  in the substrate · CPC title

• C09J2407/00

  Presence of natural rubber · CPC title

• C09J2483/005

  in the release coating · CPC title

• C09J107/00 Primary

  Adhesives based on natural rubber · CPC title