Adhesive tape

Patent metadata

Field	Value
Publication number	US-2016355707-A1
Application number	US-201515117611-A
Country	US
Kind code	A1
Filing date	Feb 9, 2015
Priority date	Feb 10, 2014
Publication date	Dec 8, 2016
Grant date	—

Abstract

The invention relates to adhesive tape having a support made of a film, an adhesive mass being applied to at least one side thereof. Said film is a monoaxially stretched film which is made up of at least 50 wt. % of a polypropylene homopolymer and 10-25 wt. %, preferably 15% of a copolymer made from ethylene and 2-6 mol % of an α-olefin. The α-olefin is a diene having at least four carbon atoms, the adhesive mass contains a polyisoprene rubber and one or more adhesive resins, the rubber/adhesive resin weight ratio being higher than 1.10.

First claim

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

2 . The adhesive tape of claim 1 , wherein the α-olefin of the copolymer is selected from the group consisting of butene, hexene and octene.

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 polypropylene homopolymer is a polypropylene reactor blend, which is a mixture of a polypropylene homopolymer with a substantially amorphous ethylene-propylene copolymer.

5 . The adhesive tape of claim 1 , wherein a polypropylene reactor blend, which is a mixture of a polypropylene homopolymer with a substantially amorphous ethylene-propylene copolymer, is included as third polymer component in the film, the pure polypropylene homopolymer, and the copolymer of ethylene and 2 to 6 mol % of an α-olefin.

6 . 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).

7 . The adhesive tape of claim 1 , wherein a melt index of the polypropylene homopolymer (230° C.) is in the range from 0.5 to 5 dg/min (g/10 min), a crystallite melting point is at least 158° C., and a flexural modulus is at least 1400 MPa.

8 . The adhesive tape of claim 1 , wherein the copolymer of ethylene and 2 to 6 mol % of an α-olefin has one or both of a melt index of 0.5 to 5 dg/min (190° C.) and a density of 0.895 to 0.925 g/cm 3 .

9 . 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.

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

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

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

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

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

15 . 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.

16 . The adhesive tape of claim 1 , wherein the adhesive comprises at least one UV protectant.

17 . 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, comprising a step of applying the adhesive tape of claim 1 .

18 . (canceled)

19 . The adhesive tape of claim 1 , wherein the monoaxially oriented film comprises at least 50 wt % of a polypropylene homopolymer and 15 wt %, 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.

20 . The adhesive tape of claim 1 , wherein the adhesive comprises further blend components selected from the group consisting of plasticizers, ageing inhibitors, processing assistants, fillers, dyes, optical brighteners, stabilizers, and endblock reinforcer resins.

21 . The adhesive tape of claim 16 , wherein the adhesive comprises further blend components selected from the group consisting of plasticizers, ageing inhibitors, processing assistants, fillers, dyes, optical brighteners, stabilizers, and endblock reinforcer resins.

Assignees

• Tesa Se

Inventors

• Lange Frank
• Kerep Patrick
• MüSSIG BERNHARD
• Urban Tanja

Classifications

• C09J7/383

  Natural or synthetic rubber · CPC title

• C09J2423/046

  in the substrate · CPC title

• C09J2407/00

  Presence of natural rubber · CPC title

• C09J7/243 Primary

  Ethylene or propylene polymers · CPC title

• C09J2423/106

  in the substrate · CPC title