DE102017006622A1 - Optimizing the cutting of parent rolls - Google Patents

Abstract

The invention relates to a method for the production of disk rolls (3) by providing an adhesive tape (2) with a carrier layer (9) and an adhesive layer (7) and an adhesive side of the adhesive layer (7) over the entire surface except for at least one strip ( 4), which extends along a longitudinal direction of the adhesive layer (7), with a liner (8) is covered, the adhesive tape (2) is wound into a mother adhesive tape roll (1) and thereby directly superimposed winding layers of the mother adhesive tape roll (1) along the at least gluing a strip (4) together, one after the glued end of the adhesive tape roll (1) opposite end successively disc rollers (3) are cut off.

Description

The invention relates to a method for the production of disc rollers. The invention also relates to a mother adhesive tape roll.

Adhesive tapes are produced by usually a wide roll of carrier material is unrolled and then equipped with an adhesive. This adhesive can then be covered with a liner. After any further processing steps, such as drying, the carrier material equipped with adhesive, called adhesive tape web, is wound together with a liner into a so-called mother roll. For cutting, the mother roll is unwound and supplied with a liner covered tape web of a corresponding cutting device in which the tape web is cut into individual adhesive tapes, which are then usually wound on cores of cardboard or plastic, for example. Cutting can also take place directly after production, ie without the adhesive tape web, including the liner, being wound up and unwound again.
Adhesive tapes are also produced by directly tapping rolls of adhesive tape from a jumbo or mother roll.
Furthermore, it is possible that the tape web is cut without liner and the liner is applied after the cutting process in the appropriate width on the open adhesive mass side.
A relevant Abstechautomat is for example in the EP 1 436 112 A1 described.

Even narrow rolls of adhesive tape, so-called disk rolls are not produced directly, but it is first produced a wide mother tape roll from which the narrow disc rollers are cut off. Particularly with adhesive tapes of the ACX ^plus range from tesa SE, an adhesive layer of the adhesive tape is covered with a liner, otherwise the individual winding layers would stick together so tightly during the winding of the adhesive tape into an adhesive tape roll that subsequent unrolling would no longer be possible.

However, the liner has the disadvantage that the mother adhesive tape rolls telescoping, so that disc rollers are difficult to produce with a constant over the entire extent of the winding mirror width.

The ACX ^plus range includes single- or multi-layer adhesive tapes containing acrylate-based foamed adhesives.
Such adhesive tapes have a carrier layer, which is also referred to as a hard phase. The hard phase polymer base is preferably selected from the group consisting of polyvinyl chlorides (PVC), polyethylene terephthalates (PET), polyurethanes, polyolefins, polybutylene terephthalates (PBT), polycarbonates, polymethyl methacrylates (PMMA), polyvinyl butyrals (PVB), ionomers, and mixtures of two or more the polymers listed above. The polymer base of the hard phase is particularly preferably selected from the group consisting of polyvinyl chlorides, polyethylene terephthalates, polyurethanes, polyolefins and mixtures of two or more of the polymers listed above. The hard phase is essentially a polymer film whose polymer base is selected from the above materials. A "polymer film" is understood to mean a thin, flat, flexible, windable web whose material base is essentially formed by one or more polymer (s).

By "polyurethanes" is meant in a broad sense polymeric substances in which repeating units are linked together by urethane groups -NH-CO-O-.

"Polyolefins" are understood as meaning polymers containing at least 50% of repeating units of the general structure - [- CH 2 -CR 1 R 2 -] n, in which R 1 is a hydrogen atom and R 2 is a hydrogen atom or a linear or branched, saturated aliphatic radical cycloaliphatic group stands. Insofar as the polymer base of the hard phase comprises polyolefins, these are particularly preferably polyethylenes, in particular ultrahigh molecular weight polyethylenes (UHMWPE).

The term "polymer base" is understood to mean the polymer or polymers which make up the largest proportion by weight of all polymers present in the respective layer or phase.

The thickness of the hard phase is in particular s 150 .mu.m. The thickness of the hard phase is preferably 10 to 150 μm, more preferably 30 to 120 μm and in particular 50 to 100 μm, for example 70 to 85 μm. The term "thickness" is understood to mean the extent of the relevant layer or phase along the z-ordinate of an imaginary coordinate system in which the plane spanned by the machine direction and the transverse direction to the machine direction forms the xy plane. The thickness is determined by measuring at least five different points of the respective layer or phase and subsequent formation of the arithmetic mean from the obtained measurement results. The thickness measurement of the hard phase is carried out in accordance with DIN EN ISO 4593 ,

Such adhesive tapes may further comprise a soft phase comprising a polymer foam, a viscoelastic composition and / or an elastomeric composition. The polymer base of the soft phase is preferably selected from polyolefins, polyacrylates, polyurethanes and mixtures of two or more of the polymers listed above.
In the simplest variant, the adhesive tape consists only of a soft phase.

By a "polymer foam" is meant a structure of gas-filled spherical or polyhedron-shaped cells, which are bounded by liquid, semi-liquid, highly viscous or solid cell webs; Furthermore, the main component of the cell webs is a polymer or a mixture of several polymers.

A "viscoelastic composition" is understood to mean a material which, in addition to features of pure elasticity (return to the initial state after external mechanical action), also exhibits features of a viscous fluid, for example the occurrence of internal friction during deformation. In particular, polymer-based pressure-sensitive adhesives are regarded as viscoelastic compositions.

By an "elastomeric mass" is meant a material having rubbery behavior and can be repeatedly stretched at 20 ° C to at least twice its length and immediately resumes its initial dimension after cancellation of the compulsion required for the elongation.

With respect to the understanding of the terms "polymer base", "polyurethanes" and "polyolefins" the above applies. "Polyacrylates" are understood as meaning polymers whose substance-related monomer base consists of at least 50% of acrylic acid, methacrylic acid, acrylic acid esters and / or methacrylic acid esters, with acrylic acid esters and / or methacrylic acid esters being present at least proportionally in general and preferably at least 50%. In particular, a "polyacrylate" is understood to mean a polymer which can be obtained by free-radical polymerization of acrylic and / or methylacrylic monomers and optionally further copolymerizable monomers.

The polymer base of the soft phase is particularly preferably selected from polyolefins, polyacrylates and mixtures of two or more of the polymers listed above. If polyolefins belong to the polymer base of the soft phase, these are preferably selected from polyethylenes, ethylene-vinyl acetate copolymers (EVA) and mixtures of polyethylenes and ethylene-vinyl acetate copolymers (PE / EVA blends). The polyethylenes may be different types of polyethylene, for example HDPE, LDPE, LLDPE, blends of these types of polyethylene and / or mixtures thereof.

In one embodiment, the soft phase comprises a foam and a pressure-sensitive adhesive layer disposed above and below the foamed layer, wherein the polymer base of the foam is one or more polyolefin (s) and the polymer base of the pressure-sensitive adhesive layers is one or more polyacrylates. More preferably, the polymer base of the foam consists of one or more polyethylene (s), ethylene-vinyl acetate copolymer (s) and mixtures of one or more polyethylene (s) and / or ethylene-vinyl acetate copolymer (s). Most preferably, the polymer base of the foam consists of one or more polyethylene (s).

The polyolefin-based foam itself is not or only very slightly tacky. The bond with the hard phase or the substrate is therefore advantageously effected by the pressure-sensitive adhesive layers. The foaming of the polyolefin-based starting material of the foam is preferably caused by added propellant gas in the sense of physical foaming and / or by a chemical foaming agent, for example by azodicarboxylic acid diamine.

In another embodiment, the soft phase is a pressure-sensitive adhesive polymer foam whose polymer base consists of one or more polyacrylates. "Pressure sensitive adhesive foam" means that the foam itself is a pressure-sensitive adhesive and thus an application of an additional pressure-sensitive adhesive layer is not required. This is advantageous because fewer layers need to be joined together in the manufacturing process and the risk of separation phenomena and other undesirable phenomena at the layer boundaries is reduced.

A "pressure-sensitive adhesive" is understood as meaning a material whose set film remains permanently tacky and tacky at room temperature in a dry state, bonding being effected immediately by light contact pressure on a multiplicity of different substrates.

The polyacrylates are preferably obtainable by at least partial incorporation of functional monomers crosslinkable with epoxide groups. Particular preference is given to monomers having acid groups (especially carboxylic acid, sulfonic acid or phosphonic acid groups) and / or hydroxyl groups and / or acid anhydride groups and / or epoxide groups and / or amine groups; particular preference is given to monomers containing carboxylic acid groups. It is particularly advantageous if the polyacrylates copolymerized acrylic acid and / or methacrylic acid. All of these groups have a crosslinking ability with epoxy groups, whereby the polyacrylates is advantageously accessible to thermal crosslinking with incorporated epoxides.

1. a) Acrylsäureester und/oder Methacrylsäureester der folgenden Formel CH₂ = C(R^I)(COOR^II) wobei R^I = H oder CH₃ und R^II ein Alkylrest mit 4 bis 14 C-Atomen ist,
2. b) olefinisch ungesättigte Monomere mit funktionellen Gruppen der für eine Reaktivität mit Epoxidgruppen bereits definierten Art,
3. c) optional weitere Acrylate und/oder Methacrylate und/oder olefinisch ungesättigte Monomere, die mit der Komponente (a) copolymerisierbar sind.

Other monomers which can be used as comonomers for the polyacrylates, in addition to acrylic acid and / or methacrylic acid esters having up to 30 carbon atoms, for example, vinyl esters of carboxylic acids containing up to 20 carbon atoms, vinyl aromatics having up to 20 carbon atoms, ethylenic unsaturated nitriles, vinyl halides, vinyl ethers of alcohols containing 1 to 10 carbon atoms, aliphatic hydrocarbons having 2 to 8 carbon atoms and 1 or 2 double bonds or mixtures of these monomers. The properties of the polyacrylate in question can be influenced in particular by varying the glass transition temperature of the polymer by different weight proportions of the individual monomers. The polyacrylates may preferably be recycled to the following monomer composition:

1. a) acrylic acid esters and / or methacrylic acid esters of the following formula CH ₂ = C (R ^I ) (COOR ^II ) where R ^I = H or CH ₃ and R ^{II is} an alkyl radical having 4 to 14 C atoms,
2. b) olefinically unsaturated monomers having functional groups already defined for reactivity with epoxide groups,
3. c) optionally further acrylates and / or methacrylates and / or olefinically unsaturated monomers which are copolymerizable with component (a).

Preferably, the polyacrylates are based on a monomer composition in which the monomers of component (a) in an amount of 45 to 99 wt .-%, the monomers of component (b) in an amount of 1 to 15 wt .-% and the monomers the component (c) in a proportion of 0 to 40 wt .-% are included (the statements are based on the monomer mixture for the "base polymer", ie without additives of any additives to the finished polymer, such as resins, etc.). In this case, the polymerization has a glass transition temperature s 15 ° C (DMA at low frequencies) and pressure-sensitive adhesive properties.

The monomers of component (a) are, in particular, plasticizing and / or nonpolar monomers. Preferably used as monomers (a) are acrylic and methacrylic acid esters having alkyl groups consisting of 4 to 14 C atoms, particularly preferably 4 to 9 C atoms. Examples of such monomers are n-butyl acrylate, n-butyl methacrylate, n-pentyl acrylate, n-pentyl methacrylate, n-amyl acrylate, n-hexyl acrylate, n-hexyl methacrylate, n-heptyl acrylate, n-octyl acrylate, n-octyl methacrylate, n-nonyl acrylate, isobutyl acrylate , Isooctyl acrylate, isooctyl methacrylate, and their branched isomers, such as 2 ethylhexyl acrylate or 2 ethylhexyl methacrylate.

The monomers of component (b) are, in particular, olefinically unsaturated monomers having functional groups, in particular having functional groups capable of undergoing reaction with epoxide groups.

For component (b), preference is given to using monomers having functional groups which are selected from the group comprising: hydroxyl, carboxy, sulfonic or phosphonic acid groups, acid anhydrides, epoxides, amines. Particularly preferred examples of monomers of component (b) are acrylic acid, methacrylic acid, itaconic acid, maleic acid, fumaric acid, crotonic acid, aconitic acid, dimethylacrylic acid, β-acryloyloxypropionic acid, trichloroacrylic acid, vinylacetic acid, vinylphosphonic acid, itaconic acid, maleic anhydride, hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, 6 Hydroxyhexyl methacrylate, allyl alcohol, glycidyl acrylate, glycidyl methacrylate.

In principle, all vinylically functionalized compounds which are copolymerizable with component (a) and / or component (b) can be used as component (c). The monomers of component (c) can serve to adjust the properties of the resulting PSA.

Exemplary monomers of component (c) are:

Methylacrylate, ethylacrylate, propylacrylate, methylmethacrylate, ethylmethacrylate, benzylacrylate, benzylmethacrylate, sec-butylacrylate, tert-butylacrylate, phenylacrylate, phenylmethacrylate, isobornylacrylate, isobornylmethacrylate, tert-butylphenylacrylate, tert-butylaphenylmethacrylate, dodecylmethacrylate, isodecylacrylate, laurylacrylate, n-undecylacrylate, stearylacrylate, Tridecyl acrylate, behenyl acrylate, cyclohexyl methacrylate, cyclopentyl methacrylate, phenoxyethyl acrylate, phenoxyethyl methacrylate, 2-butoxyethyl methacrylate, 2-butoxyethyl acrylate, 3,3,5-trimethylcyclohexyl acrylate, 3,5-dimethyladamantyl acrylate, 4-cumylphenyl methacrylate, cyanoethyl acrylate, cyanoethyl methacrylate, 4-biphenyl acrylate, 4-biphenyl methacrylate, 2-naphthyl acrylate, 2-naphthyl methacrylate, tetrahydrofurfuryl acrylate, diethylaminoethyl acrylate, diethylaminoethyl methacrylate, dimethylaminoethyl acrylate, dimethylaminoethyl methacrylate, 2-butoxyethyl acrylate, 2-butoxyethyl methacrylate, 3 Methoxyacrylate, 3-methoxybutyl acrylate, Phenoxyethylacrlylat, phenoxyethyl methacrylate, 2-phenoxyethyl, Butyldiglykolmethacrylat, ethylene glycol acrylate, Ethylenglycolmonomethylacrylat, methoxy polyethylene glycol 350, polyethylene glycol methacrylate, methoxy 500, Propylenglycolmonomethacrylat, Butoxydiethylenglykolmethacrylat, ethoxytriethyleneglycol, Octafluoropentylacrylat, octafluoropentyl methacrylate, 2,2,2-trifluoroethyl, 1,1, 1,3,3,3-hexafluoroisopropyl acrylate, 1,1,1,3,3,3-hexafluoroisopropyl methacrylate, 2,2,3,3,3-pentafluoropropyl methacrylate, 2,2,3,4,4,4-hexafluorobutyl methacrylate, 2,2,3,3,4,4,4-heptafluorobutyl acrylate, 2,2,3,3,4,4,4-heptafluorobutyl methacrylate, 2,2,3,3,4,4,5,5,6, 6,7,7,8,8,8-pentadecafluorooctyl methacrylate, dimethylaminopropylacrylamide, dimethylaminopropylmethacrylamide, N- (1-methylundecyl) acrylamide, N- (n-butoxymethyl) acrylamide, N- (butoxymethyl) methacrylamide, N- (ethoxymethyl) acrylamide, N- (n-octadecyl) acrylamide, wide N, N-dialkyl-substituted amides, such as, for example, N, N-dimethylacrylamide, N, N-dimethylmethacrylamide, N-benzylacrylamides, N-isopropylacrylamide, N-tert-butylacrylamide, N-tert-octylacrylamide, N-methylolacrylamide, N-methylolmethacrylamide, acrylonitrile, methacrylonitrile, vinyl ethers, such as vinyl methyl ether, ethyl vinyl ether, vinyl isobutyl ether, vinyl esters, such as vinyl acetate, vinyl chloride, vinyl halides, vinylidene chloride, vinylidene halides, vinylpyridine, 4-vinylpyridine, N-vinylphthalimide, N-vinyllactam, N-vinylpyrrolidone, styrene, a- and p-methylstyrene, a-butylstyrene, 4-n-butylstyrene, 4-n-decylstyrene, 3,4-dimethoxystyrene. Macromonomers such as 2-polystyrene ethyl methacrylate (molecular weight M _w from 4000 to 13000 g / mol), poly (methyl methacrylate) ethyl methacrylate (M _w from 2000 to 8000 g / mol).

Monomers of component (c) may advantageously also be chosen such that they contain functional groups which promote a subsequent radiation-chemical crosslinking (for example by electron beams, UV). Suitable copolymerizable photoinitiators are, for example, benzoin acrylate and acrylate-functionalized benzophenone derivatives. Monomers which promote electron beam crosslinking are, for example, tetrahydrofurfuryl acrylate, N-tert-butylacrylamide and allyl acrylate.

The preparation of the polyacrylates ("polyacrylates" is understood in the context of the invention to be synonymous with "poly (meth) acrylates") can be carried out by methods familiar to the person skilled in the art, in particular advantageously by conventional free-radical polymerizations or controlled free-radical polymerizations. The polyacrylates can be prepared by copolymerization of the monomeric components using the usual polymerization initiators and optionally regulators, being polymerized at the usual temperatures in bulk, in emulsion, for example in water or liquid hydrocarbons, or in solution.

The polyacrylates are preferably prepared by polymerization of the monomers in solvents, in particular in solvents having a boiling range of from 50 to 150 ° C., preferably from 60 to 120 ° C., using the usual amounts of polymerization initiators, generally from 0.01 to 5, in particular at 0.1 to 2 wt .-% (based on the total weight of the monomers) are prepared.

In principle, all known to the expert, customary initiators are. Examples of radical sources are peroxides, hydroperoxides and azo compounds, for example dibenzoyl peroxide, cumene hydroperoxide, cyclohexanone peroxide, di-t-butyl peroxide, cyclohexylsulfonyl acetyl peroxide, diisopropyl percarbonate, t-butyl peroctoate, benzpinacol. In a very preferred procedure, the free-radical initiator used is 2,2'-azobis (2-methylbutyronitrile) (Vazo® 67 ™ from DuPont) or 2,2'-azobis (2-methylpropionitrile) (2,2'-azobisisobutyronitrile; AIBN Vazo® 64 ™ from DuPont).

Suitable solvents for the preparation of the polyacrylates are alcohols such as methanol, ethanol, n- and iso-propanol, n- and iso-butanol, preferably isopropanol and / or isobutanol, and hydrocarbons such as toluene and in particular gasoline having a boiling range of 60 to 120 ° C. in question. It is also possible to use ketones, such as, preferably, acetone, methyl ethyl ketone, methyl isobutyl ketone and esters, such as ethyl acetate, and mixtures of solvents of the type mentioned, with mixtures containing isopropanol, in particular in amounts of from 2 to 15% by weight, preferably from 3 to 10% by weight. , based on the solvent mixture used, are preferred.

Preferably, after the preparation (polymerization) of the polyacrylates, a concentration takes place, and the further processing of the polyacrylates takes place essentially solvent-free. The concentration of the polymer can be done in the absence of crosslinker and accelerator substances. However, it is also possible to add one of these classes of compounds to the polymer even before the concentration, so that the concentration then takes place in the presence of this substance (s).

The polymers can be converted into a compounder after the concentration step. Optionally, the concentration and the compounding can also take place in the same reactor.

The weight-average molecular weights M _{w of} the polyacrylates are preferably within a range from 20,000 to 2,000,000 g / mol; more preferably in a range of 100,000 to 1,000,000 g / mol, most preferably in a range of 150,000 to 500,000 g / mol (the data of the average molecular weight M _w and the polydispersity PD in this document refer to the determination by gel permeation chromatography. The eluent used was THF containing 0.1% by volume of trifluoroacetic acid and the measurement was carried out at 25 ° C. The precolumn used was PSS-SDV, 5 μm, 10 ³ Å, ID 8.0 mm × 50 mm the columns PSS-SDV, 5 μm, 10 ³ Å, 10 ⁵ Å and 10 ⁶ Å each having ID 8.0 mm × 300 mm were used, the sample concentration was 4 g / L, the flow rate was 1.0 mL per minute was measured against PMMA standards.
The weight average molecular weight M _w is determined by gel permeation chromatography (GPC). The eluent used is THF with 0.1% by volume of trifluoroacetic acid. The measurement takes place at 25 ° C. The precolumn used is PSS-SDV, 5 μ, 10 ³ Å, ID 8.0 mm × 50 mm. For separation, the columns PSS-SDV, 5 μ, 10 ³ Å and 10 ⁵ Å and 10 ⁶ Å, each with ID 8.0 mm × 300 mm are used. The sample concentration is 4 g / l, the flow rate 1.0 ml per minute. It is measured against PMMA standards. (μ = μm, 1 Å = 10 ^-10 m).). For this purpose, it may be advantageous to carry out the polymerization in the presence of suitable polymerization regulators, such as thiols, halogen compounds and / or alcohols, in order to set the desired average molecular weight.)

The polyacrylate preferably has a K value of from 30 to 90, more preferably from 40 to 70, measured in toluene (1% solution, 21 ° C). The K value according to Fikentscher is a measure of the molecular weight and the viscosity of the polymer.

Particularly suitable are polyacrylates which have a narrow molecular weight distribution (polydispersity PD <4). Despite relatively low molecular weight after crosslinking, these compositions have a particularly good shear strength. In addition, the lower polydispersity allows for easier melt processing, since the flow viscosity is lower compared to a more widely dispersed polyacrylate with largely similar application properties. Narrowly distributed poly (meth) acrylates can be advantageously prepared by anionic polymerization or by controlled radical polymerization, the latter being particularly well suited. Examples of such polyacrylates which are prepared by the RAFT process are described in US Pat US 6,765,078 B2 and US 6,720,399 B2 described. Also via N-Oxyle can be prepared corresponding polyacrylates, such as in the EP 1 311 555 B1 is described. Atom Transfer Radical Polymerization (ATRP) can also be used advantageously for the synthesis of narrowly distributed polyacrylates, preference being given to monofunctional or difunctional secondary or tertiary halides as initiator and to abstraction of the halide (s) Cu, Ni, Fe -, Pd, Pt, Ru, Os, Rh, Co, Ir, Ag or Au complexes are used. The different possibilities of ATRP are in the scriptures US 5,945,491 A . US 5,854,364 A and US 5,789,487 A described.

The monomers for the preparation of the polyacrylates preferably contain proportionally functional groups which are suitable for entering into linking reactions with epoxide groups. This advantageously allows thermal crosslinking of the polyacrylates by reaction with epoxides. By linking reactions are meant in particular addition and substitution reactions. Thus, it is preferable to link the building blocks carrying the functional groups with building blocks bearing epoxy groups, in particular in the sense of crosslinking the polymer building blocks carrying the functional groups via crosslinking molecules carrying epoxide groups as bridging bridges. The epoxide group-containing substances are preferably multifunctional epoxides, ie those having at least two epoxide groups; Accordingly, it is preferable in total to an indirect linkage of the blocks carrying the functional groups.

The polyacrylate or the polyacrylates are preferably crosslinked by linking reactions - in particular in the sense of addition or substitution reactions - of functional groups contained in them with thermal crosslinkers. It is possible to use all thermal crosslinkers which ensure both a sufficiently long processing time, so that there is no gelling during the processing process, as well as rapid post-crosslinking of the polymer to the desired degree of crosslinking at temperatures lower than the processing temperature, in particular at room temperature. to lead. It is possible, for example, a combination of carboxyl, amine and / or hydroxyl-containing polymers and isocyanates as crosslinking agents, in particular those in the EP 1 791 922 A1 described aliphatic or amine-deactivated trimerized isocyanates.

Suitable isocyanates are in particular trimerized derivatives of MDI [4,4-methylenedi (phenyl isocyanate)], HDI [hexamethylene diisocyanate, 1,6-hexylene diisocyanate] and / or IPDI [isophorone diisocyanate, 5-isocyanato-1-isocyanatomethyl-1,3,3- trimethylcyclohexane], for example the types Desmodur® N3600 and XP2410 (in each case BAYER AG: aliphatic polyisocyanates, low-viscosity HDI trimers). Also suitable is the surface-deactivated dispersion of micronized trimerized IPDI BUEJ 339®, now HF9® (BAYER AG).

Basically suitable for crosslinking, however, are other isocyanates such as Desmodur VL 50 (polyisocyanates based on MDI, Bayer AG), Basonat F200WD (aliphatic polyisocyanate, BASF AG), Basonat HW100 (water-emulsifiable polyfunctional isocyanate based on HDI, BASF AG), Basonat HA 300 (allophanate-modified polyisocyanate on isocyanurate, HDI-based, BASF) or Bayhydur VPLS2150 / 1 (hydrophilic modified IPDI, Bayer AG).
The thermal crosslinker, for example the trimerized isocyanate, is preferably used at from 0.1 to 5% by weight, in particular from 0.2 to 1% by weight, based on the total amount of the polymer to be crosslinked.

The thermal crosslinker preferably comprises at least one substance containing epoxide groups. The epoxide group-containing substances are in particular multifunctional epoxides, ie those having at least two epoxide groups; Accordingly, there is an overall indirect linkage of the functional groups bearing blocks. The epoxide group-containing substances can be both aromatic and aliphatic compounds.

Highly suitable multifunctional epoxides are oligomers of epichlorohydrin, polyether polyhydric alcohols (especially ethylene, propylene and butylene glycols, polyglycols, thiodiglycols, glycerol, pentaerythritol, sorbitol, polyvinyl alcohol, polyallylalcohol and the like), epoxy ethers of polyhydric phenols [especially resorcinol, hydroquinone, bis - (4-hydroxyphenyl) -methane, bis (4-hydroxy-3-methylphenyl) -methane, bis (4-hydroxy-3,5-dibromophenyl) -methane, bis- (4-hydroxy-3,5- difluorophenyl) methane, 1,1-bis (4-hydroxyphenyl) ethane, 2,2-bis (4-hydroxyphenyl) propane, 2,2-bis (4-hydroxy-3-methylphenyl) -propane, 2 , 2-bis- (4-hydroxy-3-chlorophenyl) -propane, 2,2-bis (4-hydroxy-3,5-dichlorophenyl) -propane, 2,2-bis- (4-hydroxy-3, 5-dichlorophenyl) -propane, bis (4-hydroxyphenyl) phenylmethane, bis (4-hydroxyphenyl) phenylmethane, bis (4-hydroxyphenyl) diphenylmethane, bis (4-hydroxyphenyl) -4'-methylphenylmethane, 1, 1-bis (4-hydroxyphenyl) -2,2,2-trichloroethane, bis (4-hydroxyphenyl) - (4-chlorophenyl) -methane, 1,1-B is- (4-hydroxyphenyl) -cyclohexane, bis (4-hydroxyphenyl) -cyclohexylmethane, 4,4'-dihydroxydiphenyl, 2,2'-dihydroxydiphenyl, 4,4'-dihydroxydiphenylsulfone] and their hydroxyethyl ether, phenol-formaldehyde condensation products such as phenol alcohols, phenol-aldehyde resins and similar, S- and N-containing epoxides (for example N, N-diglycidylanillin, N, N'-dimethyldiglycidyl-4,4-diaminodiphenylmethane) and also epoxides which are prepared by conventional methods from polyunsaturated carboxylic acids or mono- or polyunsaturated carboxylic acids unsaturated carboxylic acid residues of unsaturated alcohols, glycidyl esters, polyglycidyl esters which can be obtained by polymerization or copolymerization of glycidyl esters of unsaturated acids or from other acidic compounds (cyanuric acid, diglycidyl sulfide, cyclic trimethylene trisulfone or derivatives thereof and others) are obtainable.

Very suitable ethers are, for example, 1,4-butanediol diglycidyl ether, polyglycerol-3-glycidyl ether, cyclohexanedimethanol diglycidyl ether, glycerol triglycidyl ether, neopentylglycol diglycidyl ether, pentaerythritol tetraglycidyl ether, 1,6-hexanediol diglycidyl ether, polypropylene glycol diglycidyl ether, trimethylolpropane triglycidyl ether, pentaerythritol tetraglycidyl ether, bisphenol A diglycidyl ether and bisphenol F diglycidyl ether.

Particularly preferred is the use of an example in the EP 1 978 069 A1 crosslinker-accelerator system ("crosslinking system") described in order to obtain better control over both processing time, crosslinking kinetics and degree of crosslinking. The crosslinker-accelerator system comprises at least one substance containing epoxide groups as crosslinker and at least one substance accelerating at a temperature below the melting temperature of the polymer to be crosslinked for crosslinking reactions by means of compounds containing epoxide groups as accelerator.

As accelerators, particular preference is given to amines (formally as substitution products of ammonia, in the following formulas these substituents are represented by "R" and include in particular alkyl and / or aryl radicals and / or other organic radicals), particularly preferably those amines which react with the building blocks of the polymers to be crosslinked little or no reactions.

In principle, it is possible to select both primary (NRH ₂ ), secondary (NR ₂ H) and tertiary amines (NR ₃ ) as accelerators, of course also those which have a plurality of primary and / or secondary and / or tertiary amine groups. However, particularly preferred accelerators are tertiary amines such as triethylamine, triethylenediamine, benzyldimethylamine, dimethylamino-methylphenol, 2,4,6-tris (N, N-dimethylaminomethyl) phenol, N, N'-bis (3- (dimethylamino) ) propyl) urea. Advantageously, multifunctional amines such as diamines, triamines and / or tetramines can also be used as accelerators. For example, diethylenetriamine, triethylenetetramine, trimethylhexamethylenediamine are excellent.

In addition, amino alcohols are preferably used as accelerators. Secondary and / or tertiary amino alcohols are particularly preferably used, wherein in the case of several amine functionalities per molecule preferably at least one, preferably all amine functionalities are secondary and / or tertiary. As preferred amino alcohol accelerators, triethanolamine, N, N-bis (2-hydroxypropyl) ethanolamine, N-methyldiethanolamine, N-ethyldiethanolamine, 2-aminocyclohexanol, bis (2-hydroxycyclohexyl) methylamine, 2- (diisopropylamino) ethanol, 2- ( Dibutylamino) ethanol, N-butyldiethanolamine, N-butylethanolamine, 2- [bis (2-hydroxyethyl) amino] -2- (hydroxymethyl) -1,3-propanediol, 1- [bis (2-hydroxyethyl) amino] -2- propanol, triisopropanolamine, 2- (dimethylamino) ethanol, 2- (diethylamino) ethanol, 2- (2-dimethylaminoethoxy) ethanol, N, N, N'-trimethyl-N'-hydroxyethyl bisaminoethyl ether, N, N, N'-trimethylaminoethylethanolamine and or N, N, N'-trimethylaminopropylethanolamine.

Other suitable accelerators are pyridine, imidazoles (such as 2-methylimidazole) and 1,8-diazabicyclo [5.4.0] undec-7-ene. Cycloaliphatic polyamines can also be used as accelerators. Also suitable are phosphate-based accelerators, such as phosphines and / or phosphonium compounds, for example triphenylphosphine or tetraphenylphosphonium tetraphenylborate.

Furthermore, it can be provided that a polymer foam having an adhesive pressure per se with a polymer base consisting of polyacrylate (s) is also coated on top and / or underside with a pressure-sensitive adhesive, wherein the polymer base of this pressure-sensitive adhesive preferably also consists of polyacrylates. Alternatively, other or otherwise pretreated adhesive layers, ie for example pressure-sensitive adhesive layers and / or heat-activatable layers based on polymers other than poly (meth) acrylates, can be laminated to the foamed layer. Suitable base polymers are natural rubbers, synthetic rubbers, acrylate block copolymers, vinylaromatic block copolymers, in particular styrene block copolymers, EVA, polyolefins, polyurethanes, polyvinyl ethers and silicones. Preferably, these layers contain no appreciable proportions of migratable constituents that are so well compatible with the material of the foamed layer that they diffuse in a significant amount in the foamed layer and change the properties there.

Generally, the soft phase of the adhesive tape may contain at least one tackifying resin. Suitable tackifying resins are, in particular, aliphatic, aromatic and / or alkylaromatic hydrocarbon resins, hydrocarbon resins based on pure monomers, hydrogenated hydrocarbon resins, functional hydrocarbon resins and natural resins. Preferably, the tackifying resin is selected from the group consisting of pinene, indene and rosin resins, their disproportionated, hydrogenated, polymerized and / or esterified derivatives and salts, terpene resins and terpene phenolic resins, and C5, C9 and other hydrocarbon resins. Also, combinations of these and other resins can be used advantageously to adjust the properties of the resulting adhesive as desired. Most preferably, the tackifying resin is selected from the group comprising terpene phenolic resins and rosin esters.

The soft phase of the adhesive tape may contain one or more fillers. The filler (s) may be in one or more layers of the soft phase.

The soft phase preferably comprises a polymer foam, and the polymer foam contains partially or fully expanded microballoons, in particular if the polymer base of the polymer foam comprises one or more polyacrylates and very particularly preferably if the polymer base of the polymer foam consists of one or more polyacrylate (s). consists. Microballoons are elastic hollow spheres which have a thermoplastic polymer shell; They are therefore also referred to as expandable polymeric microspheres or hollow microspheres. These balls are filled with low-boiling liquids or liquefied gas. In particular, polyacrylonitrile, polyvinyldichloride (PVDC), polyvinyl chloride (PVC), polyamides or polyacrylates are used as the shell material. As a low-boiling liquid in particular lower alkanes, for example isobutane or isopentane are suitable, which are included as a liquefied gas under pressure in the polymer shell. By a physical action on the microballoons, for example by a heat - especially by heat or heat generated, for example, by ultrasound or microwave radiation - softened on the one hand, the outer polymer shell, at the same time, the liquid propellant located in the shell is in its gaseous state. At a certain pairing of pressure and temperature - also known as critical pairing - the microballoons expand irreversibly and expand three-dimensionally. The expansion is completed when the internal and external pressures equalize. As the polymeric shell is preserved, this results in a closed-cell foam.

A variety of microballon types are commercially available, such as Akzo Nobel's Expancel DU grades (dry unexpanded), which are essentially sized (6 to 45 μm diameter in the unexpanded state) and their starting temperature needed for expansion (75 ° C to 220 ° C) differentiate.
Furthermore, unexpanded microballoon types are also available as an aqueous dispersion with a solids content. or microballoon content of about 40 to 45 wt .-% available, moreover, as a polymer-bound microballoons (masterbatches), for example, in ethyl vinyl acetate having a microballoon concentration of about 65 wt .-%. Furthermore, so-called microballoon slurry systems are available, in which the microballoons are present with a solids content of 60 to 80 wt .-% as an aqueous dispersion. Both the microballoon dispersions, the microballoon slurries and the masterbatches are suitable, like the DU types, for foaming a polymer foam contained in the soft phase of the adhesive tape.

The polymer foam particularly preferably contains microballoons which, in the unexpanded state at 25 ° C., have a diameter of 3 μm to 40 μm, in particular 5 μm to 20 μm, and / or, after expansion, a diameter of 10 μm to 200 μm, in particular 15 μm μm to 90 μm.

Preferably, the polymer foam contains up to 30 wt .-% microballoons, in particular between 0.5 wt .-% and 10 wt .-%, each based on the total mass of the polymer foam.

The polymer foam of the soft phase of the adhesive tape - if it comprises a polymer foam - is preferably characterized by the substantial absence of open-cell cavities. Particularly preferably, the polymer foam has a proportion of voids without their own polymer shell, ie of open-cell cavities, of not more than 2% by volume, in particular not more than 0.5% by volume. The polymer foam is thus preferably a closed-cell foam.

Optionally, the soft phase of the adhesive tape also powdered and / or granular fillers, dyes and pigments, in particular abrasive and reinforcing fillers such as chalks (CaCO3), titanium dioxide, zinc oxides and carbon blacks also in high proportions, that is from 0.1 to 50 wt .-%, based on the total mass of the soft phase.

Furthermore, flame retardant fillers such as ammonium polyphosphate; electrically conductive fillers such as carbon black, carbon fibers and / or silver-coated beads; thermally conductive materials such as boron nitride, alumina, silicon carbide; ferromagnetic additives such as iron (III) oxides; further additives for increasing the volume, such as, for example, blowing agents, glass full spheres, glass hollow spheres, carbonized microspheres, hollow phenolic microspheres, microspheres of other materials; Silicic acid, silicates, organically renewable raw materials such as wood flour, organic and / or inorganic nanoparticles, fibers; Anti-aging agents, light stabilizers, antiozonants and / or compounding agents may be included in the soft phase. As anti-aging agents, both primary, e.g. 4-methoxyphenol or Irganox® 1076, as well as secondary anti-aging agents, e.g. Irgafos® TNPP or Irgafos® 168 from BASF, if appropriate also in combination with one another. Phenothiazine (C radical scavenger) and hydroquinone methyl ether in the presence of oxygen and oxygen itself can be used as further anti-aging agents.

The thickness of the soft phase is preferably 200 to 1800 .mu.m, particularly preferably 300 to 1500 .mu.m, in particular 400 to 1000 microns. The thickness of the soft phase is determined according to ISO 1923.

The combination of hard and soft phase or also provided in the hard and / or soft phase layers to each other to the adhesive tape can be done for example by lamination, lamination or coextrusion. It is possible that hard and soft phases are directly, that is, directly, interconnected. It is likewise possible for one or more adhesion-promoting layer (s) to be arranged between hard and soft phase. The tape may also contain additional layers.

Preferably, at least one of the layers to be bonded together, more preferred are several of the layers to be joined together, and most preferably all of the layers to be interconnected with corona (with air or nitrogen), plasma (air, nitrogen or other reactive gases or reactive compounds which can be used as aerosol) or flame pretreatment methods.

On the back, that is on the side facing away from the substrate side of the hard phase, a functional layer is preferably applied, which has, for example, release properties or UV stabilizing properties. This functional layer preferably consists of a foil having a thickness of s 20 μm, more preferably of s 10 μm, in particular of ≤ 8 μm, for example of ≤ 5 μm or a lacquer having a thickness of ≤ 10 μm, particularly preferably ≤ 6 μm , in particular of ≤ 3 μm, for example of ≤ 1.5 μm. Both the film and the paint preferably contain a UV absorber, and / or the polymer base of the film or the paint contains UV-absorbing and / or UV-repellent groups.

Films can be applied to the backside of the hard phase by lamination, lamination or coextrusion. The film is preferably a metallized film. The polymer base of the film is preferably selected from A group consisting of polyarylenes, polyvinyl chlorides (PVC), polyethylene terephthalates (PET), polyurethanes, polyolefins, polybutylene terephthalates (PBT), polycarbonates, polymethyl methacrylates (PMMA), polyvinyl butyrals (PVB), ionomers and blends of two or more of the polymers listed above. "Main ingredient" here means ingredient with the largest weight fraction, based on the total weight of the film. With the exception of the polyarylenes, all listed materials of the film preferably have a high content of UV stabilizers.

In a specific embodiment, the adhesive tape is in a sequence directed to the substrate of a functional layer (as described above); a hard phase and a soft phase consisting of a pressure-sensitive adhesive layer, a polymer foam whose polymer base consists of one or more polyolefins, and a further pressure-sensitive adhesive layer. The lower pressure-sensitive adhesive layer may be covered with a release liner, but this is not expected to be adhesive tape.

In a further specific embodiment, the adhesive tape is in a sequence directed to the substrate of a functional layer (as described above); a hard phase and a pressure sensitive soft phase whose polymer base consists of one or more polyacrylates. Also in this embodiment, the bottom, that is, the side facing the substrate, the soft phase may be covered with a release liner, but this is not expected to be the adhesive tape.

The adhesive tapes are preferably foamed acrylate compositions, in particular of the type described above, which may additionally have one (or more) intermediate carriers.

It is an object of the present invention to provide a method for the production of disc rolls, which avoids the disadvantages mentioned above, and it is also an object of the present invention to provide a mother adhesive tape roll, from the disk rolls with one over the entire extent the winding mirror same width can be easily cut off.

The object is achieved in its first aspect by a method having the features of claim 1.

According to the invention, an adhesive tape with a carrier layer and an adhesive layer is provided, and an adhesive side of the adhesive layer is covered with a liner over the entire surface except for a strip which extends along a longitudinal direction of the adhesive layer. In principle, the structure of an adhesive tape may of course be much more complicated than two-layered or three-layered, in particular the adhesive layer may have several layers, in particular primer layers may be present between the carrier layer and the adhesive layer, which increase the adhesive forces between the carrier layer and the adhesive layer. Preferably, the adhesive force between carrier layer and adhesive layer is greater, preferably significantly greater than the bond between the adhesive layer and liner, so that the liner can be easily removed from the adhesive tape after rolling the adhesive tape.

According to the invention, it is provided that the liner does not extend over the entire adhesive side over its entire surface, but leaves at least one strip of the adhesive side of the adhesive layer which extends in the longitudinal direction. The adhesive tape is wound up into a mother adhesive tape roll, in which case directly superimposed winding layers of the mother adhesive tape roll stick together along the strip. By gluing the winding layers of the mother adhesive tape roll telescoping the mother adhesive tape roll is counteracted, so that according to the invention from one of the glued end of the mother adhesive tape roll opposite end successively narrow disc rollers are cut. Narrow means here that the width of the disk rolls is smaller than the width of the mother adhesive tape roll, preferably less than 20%, more preferably less than 10% of the width of the mother adhesive tape roll.

The at least one strip can be designed differently. The adhesive layer is preferably covered by the liner except for at least one strip extending along a longitudinal edge of the adhesive layer. The strip not covered by the liner can run directly along the edge and preferably have a width of 1 to 4%, preferably 1.5 to 3%, of the width of the adhesive tape. Of course, the strip may also be provided at other positions and / or slightly spaced from the edge of the adhesive tape in a central portion of the width of the adhesive tape; the strip may, but not necessarily, be continuous, it may extend over the longitudinal extent of the tape in sections and be interrupted in between, he may have different widths over its own longitudinal extent, etc.

The adhesive layer is preferably completely covered by the liner except for the at least one strip. When winding the adhesive tape to the mother adhesive tape roll, the directly superimposed winding layers therefore stick together only along the strip. The other areas of the adhesive tape or the other sections of the adhesive tape roll do not stick together with each other, yet the wraps of the mother adhesive tape roll lock due to sticking together along the strip.

In a further embodiment of the invention, a strip removed from the liner can be provided along both longitudinal edges of the adhesive layer. The advantage here is that when cutting the disc rollers from the mother tape roll does not have to pay attention to which end of the mother adhesive tape roll is actually glued, but the mother adhesive tape roll can be placed in both orientations in a cutting machine.

The object is met with respect to the adhesive tape roll of a mother adhesive tape roll having the features of claim 5.

The mother adhesive tape roll according to the invention is particularly suitable for carrying out one of the abovementioned processes, while, conversely, the above-mentioned processes can also be carried out in particular with a mother adhesive tape roll mentioned below.

The adhesive mother tape roll according to the invention comprises a wound-on adhesive tape with a carrier layer and an adhesive layer and a liner which covers the adhesive layer to at least one strip extending in the longitudinal direction. The carrier layer may be formed as a film.

According to the invention, the immediately superimposed winding layers of the wound-up adhesive tape are glued to one another on the strip in order to prevent telescoping of the mother adhesive tape roll. Preferably, the at least one. Strip arranged along one edge of the adhesive layer. The at least one strip can, as stated above, be continuous throughout the longitudinal direction of the adhesive tape or the adhesive layer, it can also be interrupted, it does not necessarily extend along the edge, it can preferably also extend along both longitudinal edges.

Conveniently, however, the at least one strip extends along the entire longitudinal extent of the longitudinal edge, so that the most secure possible bonding of the winding layers of the adhesive mother tape roll is ensured. The width of the strip is preferably 1 to 4%, more preferably 1.5 to 3% of the width of the adhesive tape.

Suitable materials for carrier layers are, for example, PA, PU or PVC, polyolefins or polyesters, preferably a polyester made of PET (polyethylene terephthalate). The backing layer itself may in turn consist of several individual layers, for example, layers coextruded into a film.

Preferably, polyolefins are used, but copolymers of ethylene and polar monomers such as styrene, vinyl acetate, methyl methacrylate, butyl acrylate or acrylic acid are also useful. It may be a homopolymer such as HDPE, LDPE, MDPE or a copolymer of ethylene or another olefin such as propene, butene, hexene or octene (for example LLDPE, VLLDE). Also suitable are polypropylenes (for example polypropylene homopolymers, polypropylene random copolymers or polypropylene block copolymers).

According to the invention, it is possible to use excellently as carrier layers monoaxially and biaxially oriented carrier layers. Monoaxially stretched polypropylene, for example, is characterized by its very high tensile strength and low elongation in the longitudinal direction. Particular preference is given to support layers based on polyester, in particular those of PET polyethylene terephthalate.

The carrier layer preferably has a thickness of 12 μm to 100 μm, more preferably from 28 μm to 50 μm, in particular 35 μm.

On one side of the carrier layer, an adhesive layer preferably covering the entire surface of the side of the carrier layer is provided. All known adhesive systems can be used.

In addition to natural or synthetic rubber-based adhesives, it is possible in particular to use silicone adhesives and also polyacrylate adhesives, preferably a low-molecular-weight acrylate hot-melt pressure sensitive adhesive. The latter are in the DE 198 07 752 A1 as well as in the DE 100 11 788 A1 described in more detail.

Any laminating adhesive that may be present can be selected from the same adhesive systems.

The application weight preferably ranges from 15 to 200 g / m ² , more preferably from 30 to 120 g / m ² , particularly preferably from 80 g / m ² (which corresponds approximately to a thickness of from 15 to 200 μm, more preferably from 30 to 120 μm, more preferably 80 μm).

Preferably, the adhesive is a pressure-sensitive adhesive, so a viscoelastic composition which remains permanently tacky and tacky at room temperature in a dry state. The bonding takes place by light pressure immediately on almost all substrates.

Adhesive adhesives are those based on block copolymers polymer blocks application. These are preferably formed from vinyl aromatics (A blocks), such as styrene, and by polymerization of 1,3-dienes (B blocks), such as butadiene and isoprene, or a copolymer of both. It is also possible to use mixtures of different block copolymers. Preference is given to using products which are partly or completely hydrogenated.

The block copolymers may have a linear A-B-A structure. It is also possible to use block copolymers of radial form as well as star-shaped and linear multiblock copolymers.

Instead of the polystyrene blocks and polymer blocks based on other aromatic-containing homo- and copolymers (preferably C8 to C12 aromatics) with glass transition temperatures greater than about 75 ° C can be used as for example α-methylstyrene-containing aromatic blocks. Likewise, polymer blocks based on (meth) acrylate homo- and (meth) acrylate copolymers with glass transition temperatures greater than 75 ° C can be used. Both block copolymers can be used, which on the one hand use exclusively those based on (meth) acrylate polymers as hard blocks, and on the other hand also those which use both polyaromatic blocks, for example polystyrene blocks, and poly (meth) acrylate blocks.

The information on the glass transition temperature for non-inorganic and not predominantly inorganic materials, in particular for organic and polymeric materials, refer to the glass transition temperature Tg DIN 53765: 1994-03 (see section 2.2.1), unless stated otherwise in individual cases.

Instead of styrene-butadiene block copolymers and styrene-isoprene block copolymers and / or their hydrogenation products, including styrene-ethylene / butylene block copolymers and styrene-ethylene / propylene block copolymers, block copolymers and their hydrogenation products which contain further polydiene-containing elastomer blocks can also be used according to the invention use such as copolymers of several different 1,3-dienes. Furthermore, functionalized block copolymers, such as, for example, maleic anhydride-modified or silane-modified styrene block copolymers, can be used according to the invention.

Typical use concentrations for the block copolymer are in a concentration in the range between 30 wt .-% and 70 wt .-%, in particular in the range between 35 wt .-% and 55 wt .-% before.

Other polymers which may be based on pure hydrocarbons such as unsaturated polydienes such as natural or synthetically produced polyisoprene or polybutadiene, chemically substantially saturated elastomers such as saturated ethylene-propylene copolymers, α-olefin copolymers, polyisobutylene, butyl rubber, ethylene-propylene rubber and chemically functionalized hydrocarbons such as halogenated, acrylate-containing or vinyl ether-containing polyolefins may be present, which can replace the vinyl aromatic block copolymers up to half.

Adhesive resins serve as tackifiers.

Suitable tackifier resins are u. a. preferably partially or completely hydrogenated resins based on rosin or Kolophoniumderivaten. It is also possible to use at least partially hydrogenated hydrocarbon resins obtained by partial or complete hydrogenation of aromatic hydrocarbon resins (for example Arkon P and Arkon M series from Arakawa or Regalite series from Eastman), hydrocarbon resins based on hydrogenated dicyclopentadiene polymers (cf. Example Escorez 5300 series from Exxon), hydrocarbon resins based on hydrogenated C5 / C9 resins (Escorez 5600 series from Exxon) or hydrocarbon resins based on hydrogenated C5 resins (Eastotac from Eastman) or mixtures thereof. become.

Hydrogenated polyterpene resins based on polyterpenes can also be used. The aforementioned adhesive resins can be used both alone and in admixture.

As further additives, it is typically possible to use light stabilizers, for example UV absorbers, sterically hindered amines, antiozonants, metal deactivators, processing aids, endblock-enhancing resins.

Plasticizers such as liquid resins, plasticizer oils or low molecular weight liquid polymers such as low molecular weight polyisobutylenes with molecular weights <1500 g / mol (number average) or liquid EPDM types are typically used.

• 1 eine herkömmliche Mutterklebebandrolle,
• 2 eine erfindungsgemäße Mutterklebebandrolle mit abgewickeltem Klebebandende,
• 3 die erfindungsgemäße Mutterklebebandrolle in 2, von der zwei Tellerrollen abgeschnitten sind.

The invention will be described with reference to an embodiment in three figures. Showing:

• 1 a conventional adhesive motherboard roll,
• 2 a mother adhesive tape roll according to the invention with unwound adhesive tape end,
• 3 the mother adhesive tape roll according to the invention in 2 from which two plate rolls are cut off.

A mother tape roll 1 According to the prior art consists of a wound tape 2 , The tape 2 comprises a carrier layer 9 and an adhesive layer 7 , wherein one of the carrier layer 9 opposite adhesive side of the adhesive layer 7 from a liner 8th is covered. Especially with strongly pressure-sensitive adhesives of the adhesive layer 7 is the liner 8th According to the prior art advantageous to a no longer detachable bonding immediately adjacent winding layers of the wound adhesive tape 2 to prevent each other.

Under the tape 2 Here, in principle, a planar structure is to be understood, whose longitudinal extent is many times greater than an extent along a width, and this in turn is many times greater than an extent along the thickness. The tape 2 can have a constant width over the entire longitudinal extent.

Due to the low bond strength between the liner 8th and the carrier layer 9 The next winding layer may be due to sudden sideways movement or even when cutting off wheels 3 from the mother adhesive tape roll 1 to a telescoping mother tape roll 1 come. A telescoped adhesive tape roll is in 1 shown. It can be seen that when cutting off the dish roller 3 from a telescoped mother tape roll 1 a constant width of the adhesive tape of the plate roller 3 over the entire longitudinal extent of the adhesive tape 2 is not guaranteed.

2 shows the formation of the mother adhesive tape roll according to the invention 1 , Basically, the structure is in the form of a carrier layer 9 , Adhesive layer 7 and liners 8th to the mother tape roll 1 in 1 the same, however, is a strip 4 along a longitudinal edge 6 of the tape 2 the adhesive layer 7 not from the liner 8th covered. The liner 8th according to 2 over the entire longitudinal extent of the adhesive tape 2 that is, a shorter width than the width of the adhesive layer 7 on, leaving the strip 4 along the longitudinal edge 6 of the tape 2 - in 2 the right longitudinal edge 6 of the tape 2 - remains free. When winding the tape 2 to the mother adhesive tape roll 1 according to 2 glue along the strip the winding layers of the mother adhesive tape roll 1 together. As a result, the winding layers interlock with each other, and a telescoping of the mother adhesive tape roll 1 is not possible anymore.

3 shows the fully wound mother adhesive tape roll 1 , Due to the lack of the liner 8th along the strip 4 is after winding the tape 2 to the mother adhesive tape roll 1 a diameter of the mother adhesive tape roll 1 in the section of the strip 4 slightly lower than in the remaining section of the mother tape roll 1 where a liner 8th is available. By blocking the superposed winding layers, it is now according to 3 much easier possible, relatively narrow plate rollers 3 from the mother adhesive tape roll 1 to cut off. The dish rolls 3 keep a constant width over their entire winding mirror, so that even the tape 2 the dish roll 3 after being unwound, has a constant width over the entire longitudinal extent.

LIST OF REFERENCE NUMBERS

1

Mother tape roll

2

duct tape

3

Teller role

4

strip

6

longitudinal edge

7

adhesive film

8th

liner

9

backing

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 1436112 A1 [0002]
• US Pat. No. 6765078 B2
• US Pat. No. 6,720,399 B2
• EP 1311555 B1 [0037]
• US 5945491A [0037]
• US 5854364 A [0037]
• US Pat. No. 5,789,487 A
• EP 1791922A1 [0039]
• EP 1978069 A1 [0045]
• DE 19807752A1 [0085]
• DE 10011788 A1 [0085]

Cited non-patent literature

• DIN EN ISO 4593 [0009]
• DIN 53765: 1994-03 [0092]

Claims (10)

Process for the production of disc rollers (3) by an adhesive tape (2) having a carrier layer (9) and an adhesive layer (7) is provided and an adhesive side of the adhesive layer (7) over the entire surface except for at least one strip (4) extending along a longitudinal direction of the adhesive layer (7) , covered with a liner (8), the adhesive tape (2) is wound up into a mother adhesive tape roll (1) and thereby glue together directly superimposed wound layers of the mother adhesive tape roll (1) along the at least one strip (4), one end of the glued end of the adhesive tape roll (1) opposite end successively disc rollers (3) are cut off. Method according to Claim 1 , characterized in that the adhesive layer (7) is covered by the liner (8) except for the at least one strip (4) extending along a longitudinal edge (6) of the adhesive layer (7). Method according to Claim 1 , characterized in that the adhesive layer (7) except for the at least one strip (4) over the entire surface of the liner (8) is covered. Method according to Claim 1 . 2 or 3 , characterized in that on the two longitudinal edges (6) of the adhesive layer (7) of the liner (8) freed at least one strip (4) is provided. A mother adhesive tape roll comprising a wound-on adhesive tape (2) having a carrier layer (9) and an adhesive layer (7) and a liner (8) covering the adhesive layer (7) except for at least one strip (4) extending in a longitudinal direction, characterized in that the directly superposed winding layers of the coiled-up adhesive tape (2) stick together on at least one strip (4). After adhesive tape roll Claim 5 , characterized in that the at least one strip (4) along the longitudinal edge (6) of the adhesive layer (7) is arranged. After adhesive tape roll Claim 5 or 6 , characterized in that the at least one strip (4) extends along the entire longitudinal extent of the longitudinal edge (6). After adhesive tape roll Claim 5 . 6 or 7 , characterized in that a width of the at least one strip (4) is 1-4% of a width of the adhesive tape (2). After adhesive tape roll Claim 8 , characterized in that the width of the at least one strip (4) is 1.5-3% of the width of the adhesive tape (2). Mother adhesive tape roll after one of Claims 5 to 8th , characterized in that one of the at least one strip (4) is arranged on each of the longitudinal edges (6) of the adhesive tape (2).

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