DE602012043935C5

DE602012043935C5 - Haftklebebandrolle, Herstellungsverfahren dafür und Verwendung davon zur Herstellung von wasserdichten Streifen

Info

Publication number: DE602012043935C5
Application number: DE602012043935.1A
Authority: DE
Inventors: Volker Paschmann; Doreen Eckhardt; David Georg
Original assignee: 3M Innovative Properties Co
Current assignee: 3M Innovative Properties Co
Priority date: 2012-12-19
Filing date: 2012-12-19
Publication date: 2023-03-30
Anticipated expiration: 2032-12-20
Also published as: EP2746356A1; WO2014099332A1; EP2746356B1

Abstract

Roll of acrylic foam tape, comprising an acrylic foam tape comprising an acrylic foam with opposite first and second major sides, the first major side comprising a pressure sensitive adhesive protected by a first liner and the second major side comprising a heat activatable adhesive, the acrylic foam tape being level-wound in essentially helical convolutions around a core with a second liner arranged on the heat activatable adhesive, the second liner being surface coated with an adhesive coating conferring adhesion properties between the second liner and the second major surface and extending over at least one edge of the second major surface to provide an overlap zone where the second liner of a convolution of an adhesive tape is overlapped by a succeeding convolution whereby the second liner of the preceding convolution contacts the first major surface of the tape of the succeeding convolution in the overlap zone, wherein the acrylic foam is thermally crosslinked.

Description

Betreffend das europäische Patent 2 746 356 ( DE 60 2012 043 935 ) hat der 7. Senat (Nichtigkeitssenat) des Bundespatentgerichts auf Grund der mündlichen Verhandlung vom 2. März 2022
für Recht erkannt:

I. Das europäische Patent 2 746 356 wird mit Wirkung für das Hoheitsgebiet der Bundesrepublik Deutschland dadurch teilweise für nichtig erklärt, dass seine Patentansprüche folgende Fassung erhalten:

Claims

Roll of acrylic foam tape, comprising an acrylic foam tape comprising an acrylic foam with opposite first and second major sides, the first major side comprising a pressure sensitive adhesive protected by a first liner and the second major side comprising a heat activatable adhesive, the acrylic foam tape being level-wound in essentially helical convolutions around a core with a second liner arranged on the heat activatable adhesive, the second liner being surface coated with an adhesive coating conferring adhesion properties between the second liner and the second major surface and extending over at least one edge of the second major surface to provide an overlap zone where the second liner of a convolution of an adhesive tape is overlapped by a succeeding convolution whereby the second liner of the preceding convolution contacts the first major surface of the tape of the succeeding convolution in the overlap zone, wherein the acrylic foam is thermally crosslinked.
Roll according to claim 1, characterized in that the roll has a drop-test displacement of 0.5 to 50 mm
Roll according to any of the preceding claims, characterized in that the foam tape has a length of 200 m to 1500 m.
Roll according to any of the preceding claims wherein the core is a cylinder with a length of 20 to 180 cm and a diameter of 5 to 30 cm and the tape is level-wound around the cylindrical core such that at least a first and a second substantially cylindrical level of convolutions, with reversing points at the end of each level, are formed, the second level surrounding the first level such that a first major side of the second level is in contact with a second major side of the first level or a second major side of the second level is in contact with a first major side of the first level, and the length of the first level measured along the central axis of the cylindrical core is 80 to 95% of the length of the core.
Roll according to claim 4, characterized. in that it has three or more substantially cylindrical levels of convolutions and the length of each successive level, measured along the central axis of the cylindrical core and defined by the distance of the outermost edge of a first and a last convolution of such a level, is less than the length of its preceding level.
Roll according to any of the preceding claims, characterized in that the convolutions have a helical angle and the helical angle is less than 20°, especially less than 10°.
Roll according to one of the preceding claims, characterized in that the foam comprises homopolymers, copolymers, mixtures of homopolymers or mixtures of copolymers or mixtures of one or more homopolymers and one or more copolymers selected from the group consisting of polyacrylates, polymethacrylates, polyacrylate/polymethacrylate copolymers.
Method of making a roll of adhesive tape, wherein an adhesive tape comprising a thermally crosslinked acrylic foam with opposite first and second major sides, at least one major side comprising a pressure sensitive adhesive protected by a first liner and the second major side comprising a heat-activatable adhesive and a second liner arranged on the heat activatable adhesive, the second liner being surface-coated with an adhesive coating conferring adhesion properties between the second liner and the second major surface, is wound around a cylindrical or elliptical core by feeding the tape to the core with a feed tension of between 0.5 and 5 N and a feed direction with a directional speed along the central axis of the core such that it is wound around the core in helical convolutions with a helical angle of less than 20°, preferably less than 10° or less than 5°, thus forming a first layer of tape around the core and reversing the feed direction at least once at a reversing point so that at least a second layer of helical convolutions of tape is formed on the first layer, the second liner extending over at least one edge of the second major surface to provide an overlap zone where the second liner of a convolution of the adhesive tape is overlapped by a succeeding convolution whereby the second liner of the preceding convolution contacts the first major surface of the tape of the succeeding convolution in the overlap zone.
Method according to claim 8, characterized in that the first level is fed with a first tension and each successive level is fed with a successive tension and each successive tension is lower than the preceding tension.
Method of making an elongate rubber seal for attachment to a door or a door frame, comprising: a. providing a level-wound roll of acrylic foam tape as defined in any of claims 1 to 7 or made according to a method of any of claims 8 or 9; b. providing a roll of an elongate rubber material; c. providing a lamination apparatus comprising means for unwinding said roll of acrylic foam tape, means for unwinding said roll of elongate rubber material, means for heat laminating said acrylic foam tape to said rubber material and means for guiding said roll of acrylic foam tape and said elongate rubber material to the beat laminating means; d. unwinding said roll of acrylic foam tape; e. removing said second liner; f. conveying a resulting acrylic foam tape with the surface of the heat activatable adhesive layer exposed to the heat laminating means; g. unwinding the roll of elongate rubber material and conveying the elongate rubber material to the heat laminating means; h. heat laminating the elongate rubber material and acrylic foam tape to form an elongate rubber seal; i. winding the elongate rubber seal.
Method according to claim 10, wherein the tension exerted to the second liner after removal is higher than the tension exerted to the resulting acrylic foam tape.