HEAT-ACTIVATEDLY BONDABLE 2D DIECUTTING ELEMENT
A heat-activatedly bondable, substantially two-dimensional (“2D”) diecutting element having a carrier, a first adhesive coating and a second adhesive coating is presented, its carrier taking the form of a carrier film having a first side and a second side, its first adhesive coating being disposed on the first side of the carrier film and comprising at least one heat-activable adhesive, and its second adhesive coating being disposed on the second side of the carrier film and comprising at least one heat-activable adhesive. The carrier film here has, over its two-dimensional extent, a multiplicity of openings which extend continuously through the carrier film from the first side of the carrier film through to the second side of the carrier film.
1 . Heat-activatedly bondable, substantially two-dimensional (“2D”) diecutting element having a carrier, a first adhesive coating and a second adhesive coating,
the carrier taking the form of a carrier film having a first side and a second side,
the first adhesive coating being disposed on the first side of the carrier film and comprising at least one heat-activable adhesive,
and the second adhesive coating being disposed on the second side of the carrier film and comprising at least one heat-activable adhesive, wherein
the carrier film has a multiplicity of openings over its two-dimensional extent, said openings extending continuously through the carrier film from the first side of the carrier film through to the second side of the carrier film.
2 . Heat-activatedly bondable 2D diecutting element according to claim 1 , wherein the carrier film is a polyester film.
3 . Heat-activatedly bondable 2D diecutting element according to claim 1 , wherein the openings in the carrier film have internal diameters in the range of from 5 μm to 1 mm.
4 . Heat-activatedly bondable 2D diecutting element according to claim 1 , wherein the openings in the carrier film have a density per unit area of more than 1 mm −2 .
5 . Heat-activatedly bondable 2D diecutting element according to claim 1 , wherein the openings are in the form of round holes.
6 . Heat-activatedly bondable 2D diecutting element according to claim 1 , wherein at least one of the two heat-activable adhesives, the heat-activable adhesive of the first adhesive coating or the heat-activable adhesive of the second adhesive coating, comprises a thermoplastic base polymer.
7 . Heat-activatedly bondable 2D diecutting element according to claim 1 , wherein at least one of the two heat-activable adhesives, the heat-activable adhesive of the first adhesive coating or the heat-activable adhesive of the second adhesive coating, comprises
an elastomeric base polymer and
a modifier resin,
the modifier resin comprising a tackifier resin and/or a reactive resin.
8 . Heat-activatedly bondable 2D diecutting element according to claim 1 , wherein at least one of the two heat-activable adhesives, the heat-activable adhesive of the first adhesive coating or the heat-activable adhesive of the second adhesive coating, comprises
50 to 95% by weight of a bondable polymer and
5 to 50% by weight of an epoxy resin or mixture of two or more epoxy resins,
the bondable polymer comprising
40 to 94% by weight of acrylic acid compounds and/or methacrylic acid compounds of the formula CH 2 ═CH(R 1 )(COOR 2 ), R 1 representing a radical selected from the group consisting of H and CH 3 , and R 2 representing a radical selected from the group consisting of H and alkyl chains having 1 to 30 carbon atoms,
5 to 30% by weight of a first copolymerizable vinyl monomer which has at least one carboxylic acid group and/or sulphonic acid group and/or phosphonic acid group,
1 to 10% by weight of a second copolymerizable vinyl monomer which has at least one epoxide group or one acid anhydride function and
0 to 20% by weight of a third copolymerizable vinyl monomer which has at least one functional group which differs from the functional group of the first copolymerizable vinyl monomer and from the functional group of the second copolymerizable vinyl monomer.
9 . Heat-activatedly bondable 2D diecutting element according to claim 1 , wherein at least one of the two heat-activable adhesives, the heat-activable adhesive of the first adhesive coating and the heat-activable adhesive of the second adhesive coating, comprises
40 to 98% by weight of acrylate-containing block copolymer,
2 to 50% by weight of one or more tackifying epoxy resins and/or novolak resins and/or phenolic resins and
0 to 1 0% by weight of curing agents for crosslinking the epoxy resins and/or novolak resins and/or phenolic resins.
10 . A heat-activatedly bondable diecut cut from a heat-activatedly bondable 2D diecutting element according to claim 1 .
11 . Process for producing a heat-activatedly bondable 2D diecutting element of claim 1 , comprising
coating the first side of the carrier film provided two-dimensionally with a multiplicity of continuous openings with the first adhesive coating of at least one heat-activable adhesive and
coating the second side of the carrier film provided two-dimensionally with a multiplicity of continuous openings with a second adhesive coating of at least one heat-activable adhesive.
12 . Process for producing a diecut of claim 10 , comprising
coating at least one side of the heat-activatedly bondable 2D diecutting element with a two-dimensional release agent,
diecutting the 2D diecutting element coated at least on one side with the two-dimensional release agent into a desired shape.
13 . The diecutting element of claim 2 , wherein said polyester film is a polyethylene terephthalate film or a polyethylene naphthalate film.