Adhesive tape with a carrier comprising at least one foam layer

Abstract

Adhesive tape having a carrier and a layer of adhesive applied on at least one side to the carrier, the carrier having at least one foam layer composed at least in part of a polyolefin-based polymer, wherein the polyolefin-based polymer contains an ethylene multi-block copolymer in a fraction of at least 40% (w/w), the ethylene multi-block copolymer being composed of hard segment blocks, containing at least 95% (w/w) of ethylene and a comonomer, and of soft segment blocks, containing ethylene and a comonomer, the fraction of comonomer in the soft segment blocks being between 10 and 20 mol %.

1 . Adhesive tape comprising a carrier and a layer of adhesive applied on at least one side of the carrier, the carrier comprising at least one foam layer comprising a polyolefin-based polymer, wherein the polyolefin-based polymer comprises an ethylene multi-block copolymer in a fraction of at least 40% (w/w), the ethylene multi-block copolymer being composed of hard segment blocks, comprising at least 95% (w/w) of ethylene and a comonomer, and of soft segment blocks, comprising ethylene and a comonomer, the fraction of comonomer in the soft segment blocks being between 10 and 20 mol %. 
     
     
         2 . Adhesive tape according to  claim 1 , wherein the hard segment blocks have a crystallite melting point of at least 110° C. 
     
     
         3 . Adhesive tape according to  claim 1 , wherein the ethylene multi-block copolymer is produced by chain-shuttling polymerization. 
     
     
         4 . Adhesive tape according to  claim 1 , wherein the comonomer is a C 3  to C 10  olefin. 
     
     
         5 . Adhesive tape according to  claim 1 , wherein the foam layer is produced by extruding the polyolefin-based polymer and a blowing agent to form an expandable film web and subsequently expanding this film web. 
     
     
         6 . Adhesive tape according to  claim 1 , wherein
 the degree of crosslinking of the crosslinked polyolefin-based polymer of the foam layer is 5% to 60% (w/w),   the length ratio of the cells in the foam layer (average cell diameter in MD/average cell diameter in CD) is 0.25 to 1, and/or   the length ratio of the cells in the foam layer (average cell diameter in CD/average cell diameter in VD) is 2 to 18.   
     
     
         7 . Adhesive tape according to  claim 1 , wherein the foam layer has a thickness in VD between 200 and 3000 μm and/or a density of 30 to 300 kg/m 3 . 
     
     
         8 . Adhesive tape according to  claim 1 , wherein the layer of adhesive applied on at least one side of the carrier is a pressure-sensitive adhesive selected from the group consisting of acrylate adhesives, silicone adhesives, polyurethane adhesives and rubber adhesives. 
     
     
         9 . Adhesive tape according to  claim 1 , wherein the layer of adhesive has a thickness of not more than 100 μm. 
     
     
         10 . Adhesive tape according to  claim 1 , wherein the layer of pressure-sensitive adhesive is composed of a polyacrylate pressure-sensitive adhesive and comprises a polymer comprising in relation to the polymer
 (b1) 79% to 100% by weight of acrylic esters and/or methacrylic esters and/or their free acids with the formula CH 2 ═C(R 3 )(COOR 4 ), where R 3  is H or CH 3  and R 4  is H or alkyl chains having 1 to 30 C atoms, and   (b2) 0% to 30% by weight of olefinically unsaturated monomers having functional groups.   
     
     
         11 . Adhesive tape according to  claim 1 , wherein the carrier layer comprises in addition to the foam layer at least one further functional layer. 
     
     
         12 . A method of mounting a printing plate to an impression cylinder, said method comprising mounting said printing plate to said impression cylinder with an adhesive tape according to  claim 1 .