DE102007026996A1 - Dihydrazide crosslinked water-based butadiene / acrylate copolymer dispersion PSA, in particular for soft film adhesive tapes - Google Patents

Abstract

The invention relates to PSAs based on a dihydrazide crosslinked water-based butadiene / acrylate copolymer dispersion having a butadiene content greater than 30 wt .-%, preferably greater than 55 wt .-%, based on the total solids content of butadiene and acrylate, with a resin dispersion and / or optionally mixed with an anti-aging agent dispersion.

Description

The The invention relates to a pressure-sensitive adhesive based on a butadiene / acrylate copolymer dispersion, which is particularly suitable on heavily plasticized films to be used.

Known is the use of soft film pressure-sensitive tapes for cable bandages based on carrier materials consisting of elastic Soft films, preferably soft PVC. The classic adhesive systems for cable bandaging applications are essentially based on natural rubber, polyacrylates and styrene block copolymers.

Natural rubber compounds have been favored in the past for cost reasons, However, the disadvantage is the poor aging resistance. The natural rubber compositions are usually used as a solution in an aliphatic solvent mixture for the coating used. Water-based natural rubber compounds based on centrifuge latex are also known. For the setting of the required adhesive properties is the addition of resins, fillers, anti-aging agents unavoidable. Crosslinking can either be chemically over added crosslinking agents or physically over for example, electron beam curing.

The Use of polyacrylates as adhesives for cable bandaging tapes is also well known. In addition to solutions made of polyacrylates Polyacrylate dispersions have also been described in the past. after compounding with resin dispersions and other coagents meet the requirements of a cable bandaging band.

synthetic Rubbers based on styrene-butadiene or styrene block copolymers were also used as adhesives for cable bandaging tapes described. This is the focus to solvent masses or to 100% systems, after mixing with resins and other coagents the requirements largely fulfill.

Butadiene / acrylate latexes have been used in the past for the preparation of adhesive or cohesive PSAs. So be in the DE 100 33 716 A1 PSAs based on butadiene / acrylate latices with a high content of butadiene are described for packaging adhesive tapes or in US Pat DE 101 01 333 A1 Highly cohesive pressure-sensitive adhesives based on butadiene / acrylate latex with a high butadiene content for highly cohesive PSAs. In contrast to many acrylate dispersions, the addition of resin dispersions and anti-aging agent dispersions is also necessary here for setting the required adhesive properties.

Of the Use of these adhesives in combination with a tissue or Nonwoven backing is due to the inert behavior of the backing material relatively unproblematic. Substituting water-based butadiene / acrylate latices but in combination with carrier materials, the significant Containing amounts of plasticizer, there are far-reaching problems. The plasticizers migrate depending on the storage temperature into the adhesive and change the adhesive properties to a degree that strengthens the functioning of the tape impaired.

Dihydrazides are known as crosslinking agents for PSAs, in particular for water-based polyacrylates (see, for example US 4,931,494 A . US 2006/247367 A1 or US 2004/143058 A1 ).

task The invention is an adhesive based on a butadiene / acrylate copolymer dispersion to make available, in particular in an adhesive tape, the can be used for cable bandaging, can be used and the described deficiencies not or only in minor Dimensions shows.

Solved This object is achieved by a pressure-sensitive adhesive, as in the main claim is indicated in more detail. In the dependent claims are advantageous embodiments of the PSA described. Furthermore, the inventive idea includes the use this pressure-sensitive adhesive.

Accordingly, The invention relates to a pressure-sensitive adhesive based on a dihydrazide-crosslinked water-based butadiene / acrylate copolymer dispersion with a Butadiene content greater than 30 wt .-%, preferably greater 55 wt .-% based on the total solids content of butadiene and Acrylate containing a resin dispersion, preferably a hydrocarbon resin dispersion, and / or, if appropriate, an aging inhibitor dispersion is.

at all aqueous dispersions mentioned below the proportion of water is 40 to 60 wt .-%, preferably 50 Wt .-%.

Preferred dihydrazide compounds are dicarboxylic acid dihydrazides having preferably 2 to 10 C atoms of the general formula

Called are, for example, oxalic dihydrazide, malonic dihydrazide, Succinic dihydrazide, glutaric dihydrazide, Adipic dihydrazide, sebacic dihydrazide, Maleic dihydrazide, fumaric dihydrazide, itaconic dihydrazide and / or isophthalic dihydrazide.

Adipinsäuredihydrazid oder Sebacinsäuredihydrazid zeigen eine ausreichende Wasserlöslichkeit, so dass eine Verwendung in Kombination mit wasserbasierenden Gerüstpolymeren besonders vorteilhaft möglich ist.Preferably, the dihydrazides used for crosslinking are aliphatic or aromatic dihydrazides, preferably water-soluble dihydrazides such as adipic dihydrazide or sebacic dihydrazide

Adipic dihydrazide or Sebacinsäuredihydrazid show sufficient water solubility, so that a use in combination with water-based scaffold polymers is particularly advantageous.

invention Dihydrazides are available from companies, for example Japan Hydrazine Company (Japan) or Yulin Chemicals Qidong (China).

Further The proportion of dihydrazides used for crosslinking is preferably in the butadiene / acrylate dispersion before crosslinking between 0.2 Wt .-% and 10 wt .-%, preferably 0.5 wt .-% and 5 wt .-%.

According to one Another preferred embodiment of the invention the butadiene / acrylate copolymer dispersion is a carboxylated one Butadiene / acrylate copolymer dispersion.

such Carboxylated copolymers preferably contain in particular below 10 wt .-%, preferably below 5 wt .-% based on the monomer content on a carboxyl-containing comonomer, in particular acrylic acid, in the copolymer.

Further Preferably, the butadiene content is in the butadiene / acrylate copolymer dispersion From 30% by weight to 95% by weight, particularly preferably from 60% by weight to 85% by weight, in each case based on the total solids content of butadiene and acrylate.

invention Butadiene / acrylate dispersion types having a butadiene content of greater 30% by weight are available, for example, from Dow.

A Radiation-crosslinking, in particular by electron beams (ESH) is due to many styrene block copolymers the sufficiently high molecular weight of the backbone polymers additionally possible.

When Resin component can be both dispersions of synthetic Resins as well as dispersions of natural resins, preferred Hydrocarbon resin dispersions are used.

• • hydrierte Polymerisate des Dicyclopentadiens (zum Beispiel Escorez 5300er Serie; Exxon Chemicals)
• • hydrierte Polymerisate von bevorzugt C₈- und C₉-Aromaten (zum Beispiel Regalite und Regalrez Serien; Eastman // Arkon P Serie; Arakawa), diese können durch Hydrierung von Polymerisaten aus reinen Aromatenströmen entstehen oder auch durch Hydrierung von Polymerisaten auf Basis von Gemischen unterschiedlicher Aromaten entstehen
• • teilhydrierte Polymerisate von C₈- und C₉-Aromaten (zum Beispiel Regalite und Regalrez Serien; Eastman // Arkon M; Arakawa)
• • hydrierte Polyterpenharze (zum Beispiel Clearon M; Yasuhara)
• • hydrierte C₅/C₉-Polymerisate (zum Beispiel ECR-373; Exxon Chemicals)
• • aromatenmodifizierte selektiv hydrierte Dicyclopentadienderivate (zum Beispiel Escorez 5600er Serie; Exxon Chemicals) und/oder
• • hydrierte und teilhydrierte kolophoniumbasierende Harze (zum Beispiel Foral, Foralyn; Eastman // Hydrogral; DRT)

Preferably suitable include

• Hydrogenated polymers of dicyclopentadiene (for example Escorez 5300 series, Exxon Chemicals)
• Hydrogenated polymers of preferably C ₈ and C ₉ aromatics (for example Regalite and Regalrez series, Eastman Arkon P series, Arakawa), these can be formed by hydrogenation of polymers from pure aromatic streams or by hydrogenation of polymers based on Mixtures of different aromatics arise
• • partially hydrogenated polymers of C ₈ and C ₉ aromatics (for example Regalite and Regalrez series, Eastman // Arkon M, Arakawa)
• Hydrogenated polyterpene resins (for example Clearon M; Yasuhara)
• Hydrogenated C ₅ / C ₉ polymers (for example ECR-373, Exxon Chemicals)
• Aromatic modified selectively hydrogenated dicyclopentadiene derivatives (e.g., Escorez 5600 series, Exxon Chemicals) and / or
• Hydrogenated and partially hydrogenated rosin-based resins (for example, Foral, Foralyn, Eastman // Hydrogral, DRT)

Hydrocarbon resin dispersions are clear due to the high cohesion and non-polar character to prefer.

Of the Melting point of the base resins is according to a advantageous development of the invention in the range 50 to 120 ° C, preferably 60 to 110 ° C. Based on the total solids content butadiene / acrylate copolymer and resin, the resin content is preferably in the range 5 wt .-% to 60 wt .-%, preferably 10 wt .-% to 40 Wt .-%. For targeted adjustment of adhesive properties can also be used mixtures of different resins become.

An overview of suitable resin dispersions can be found in Donatas Satas, Handbook of Pressure Sensitive Adhesive Technology, 2nd Edition Resin Dispersion by Anne Z. Casey, pages 545 to 566 ,

According to the invention suitable Resin dispersions are, for example, via Eastman available.

to Improvement of aging behavior can be dispersions usual Anti-aging agents are added from the field of Elastomers are well known.

The Pressure-sensitive adhesive according to the invention fulfilled the requirements even without the addition of anti-aging agents, ie aging protection-free.

As anti-aging agents are sterically hindered phenols and amines, phosphites and organic sulfides into consideration, preferably sterically hindered phenols which are known for example under the trade name Irganox ^®.

When Anti-aging agents in the form of antioxidants can N, N-di-2-naphthyl-p-phenylenediamine, 2,5-di (t-amyl) hydroquinone, Trimethyldihydroquinoline polymer and 6-ethoxy-2,2,4-trimethyl-1,2-dihydroquinoline, 2,6-di-t-butyl-p-cresol, 2,2'-methylenebis (4-methyl-6-t-butylphenol), 4,4'-butylidenebis (3-methyl-6-t-butylphenol), 4,4'-thio-bis (3-methyl-6-t-butylphenol), stearyl-beta (3,5-di-t-butyl-4-hydroxyphenyl) propionate, tetrakis [methylene-3- (3 ', 5'-di-t-butyl-4'-hydroxyphenyl) propionate] methane, 1,3,5-trimethyl-2,4,6-tris (3,5-di-t-butyl-4-hydroxybenzyl) benzene and 1,1,3-tris (2-methyl-4-hydroxy-5-t-butylphenol) butane, dilauryl thiodipropionate, distearyl thiodipropionate, Laurylstearyl thiodipropionate and dimyristyl thiodipropionate, triisodecyl phosphite, Diphenylisodecyl phosphite, triphenyl phosphite and trinonyl phosphite and N-salicyloyl-N'-aldehyde-hydrazine, N-salicyloyl-N'-acetylhydrazine, N, N'-diphenyloxamide and N, N'-di (2-hydroxyphenyl) oxamide Use Find.

Farther If necessary, further additives can be added to adjust the product properties such as rubbers, fillers, Soft resins, flame retardants, oils or emulsifiers for Example of the type of alkoxylated alkylphenols.

With These additives succeed, for example, when using the PSA in an adhesive tape, the rolling properties of the same in the desired Way to influence.

The Pressure-sensitive adhesive according to the invention fulfilled the requirements even without the addition of additives, ie additive-free.

Of Furthermore, the invention includes an adhesive tape, with the aid of the adhesive of the invention is prepared by adding to a substrate partially or applied over the entire surface on one or both sides of the adhesive becomes.

The Coating may also be in the form of one or more strips in the longitudinal direction (Machine direction) take place, if necessary in the transverse direction, they is especially but full surface.

Farther can the adhesives grid point-shaped means Screen printing, wherein the glue dots also different can be large and / or differently distributed, by gravure in the longitudinal and transverse direction related Webs, be applied by screen printing or by flexographic printing.

The Adhesive may be in dome form (made by screen printing) or in another pattern such as grid, stripes, zigzag lines. Furthermore, it can also be sprayed, for example, what a more or less irregular order picture results.

The adhesive application on the carrier material is according to an advantageous embodiment of the invention 5 to 120 g / m ² , preferably 15 to 40 g / m ² .

When Support materials for the invention are the especially common for cable bandaging applications Films based on polyolefins or PVC, with plasticizer contents between 20 and 60 phr.

Prefers is used as a carrier material, a tissue or a paper on that the adhesive is applied on one side.

Farther the adhesive is preferably applied to a release paper, which results in a strapless adhesive tape, also short Called Fix.

As carrier material, it is possible to use all known textile carriers such as a loop fabric, a velor, a scrim, a woven fabric, a knitted fabric, in particular a PET filament fabric or a polyamide fabric, or a nonwoven, wherein under "nonwoven" at least textile fabrics according to FIG EN 29092 (1988) as well as stitchbonded nonwovens and similar systems are to be understood.

Also can use spacer fabric and knitted fabric with lamination become. Spacer fabrics are mat-shaped laminates with a cover layer of a fiber or filament nonwoven, a Backing layer and individual layers existing between these layers or tufts of retaining fibers that extend across the surface of the laminated body distributed through the particle layer are and the top layer and the backing layer with each other connect. The holding fibers needled through the particle layer Keep the topcoat and undercoat at a distance from each other and they are with the topcoat and the undercoat connected.

When Nonwovens are particularly solid staple fiber webs, however also filament, meltblown and spun nonwovens in question, the most in addition to solidify. As possible hardening methods are for nonwovens the mechanical, the thermal as well as the chemical hardening known. Be used for mechanical consolidation the fibers mostly by turbulence of the individual fibers, by meshing fiber bundles or by sewing additional ones Threads held together purely mechanically, so can be through thermal as well as by chemical methods adhesive (with binder) or cohesive (binder-free) fiber-fiber bonds achieve. These can be achieved with suitable formulation and process control exclusively or at least predominantly Restrict fiber nodes so that preserving the loose, open structure in the fleece nevertheless a stable, three-dimensional Network is formed.

Especially Advantageously, nonwovens have been found, in particular by oversewing solidified with separate threads or by meshing are.

such solidified nonwovens are, for example, on stitchbonding machines of the type "Malivlies" of the company Karl Mayer, formerly Malimo, and are among others at the companies Naue fiber technology and Techtex GmbH available. A Malivlies is characterized that a cross-fiber fleece by the formation of meshes of fibers of the nonwoven is solidified.

When Carrier can still be a fleece of the type Kunitvlies or Multiknitvlies be used. A Kunitvlies is characterized that it comes from the processing of a longitudinally oriented fiber fleece to a fabric that appears on one side Mesh and on the other mesh webs or pile fiber pleats, but neither threads nor prefabricated fabrics has. Such a nonwoven, for example, on stitchbonding machines the type "Kunitvlies" of the company Karl Mayer for some time Time made. Another characteristic feature of this fleece is that it as a longitudinal fiber fleece in the longitudinal direction can absorb high tensile forces. A multi-knit fleece is opposite the Kunitvlies characterized in that the fleece by the piercing both sides with needles both on the upper and on the bottom undergoes a solidification.

Finally, sewing nonwovens are suitable as a precursor to form an adhesive tape. A stitchbonded web is formed from a nonwoven material having a plurality of seams running parallel to one another. These seams ent stand by the sewing or sewing of continuous textile threads. For this type of nonwoven stitching machines of the type "Maliwatt" the company Karl Mayer, formerly Malimo, known.

Then the Caliweb ^{® is} perfectly suitable. The Caliweb ^® consists of a thermally fixed non-woven Multiknit with two outer mesh layers and an inner pile layer, which are arranged perpendicular to the mesh layers.

Farther Particularly advantageous is a staple fiber fleece, which in the first step is preconsolidated by mechanical processing or that is a wet fleece hydrodynamically, with between 2% and 50% the fibers of the nonwoven are melt fibers, in particular between 5% and 40% of the fibers of the fleece.

One Such fleece is characterized in that the fibers are wet or, for example, a staple fiber nonwoven through the formation of stitches of fibers of the fleece or by needling, sewing or pretreated air and / or water jet machining becomes.

In a second step is the heat setting, the strength of the nonwoven by the melting or melting of the melt fibers again is increased.

The Solidification of the fleece carrier can also be without binder, for example by hot stamping with reach structured rolls, whereby over pressure, temperature, Residence time and the embossing geometry properties such as strength, Thickness, density, flexibility u. Ä. Are controlled can.

When Starting materials for the textile carrier are in particular polyester, polypropylene, viscose or cotton fibers intended. However, the present invention is not limited to those mentioned Materials limited, but it can, for the expert recognizably without being inventive to have a variety of other fibers for production of the fleece are used. In particular, wear-resistant Polymers such as polyesters, polyolefins, polyamides or glass or carbon fibers Use.

When Carrier material are also carriers made of paper (creped and / or uncreped), from a laminate, from a foil (For example, polyethylene, polypropylene, mono- or biaxially oriented Polypropylene films, polyester, PA, PVC and other films), or from sheet-like foams (for example, polyethylene and polyurethane).

On The flank can be the surfaces of the wearer be pretreated chemically or physically, as well as the back the same of an anti-adhesive physical treatment or coating.

After all the web-shaped carrier material can be a double-sided antiadhesive coated material will be like a release paper or a release liner, also called a liner.

Especially the use of the PSA on flexible films is advantageous preferably of the plasticizer-modified PVC type or a plasticizer-containing olefin, wherein the plasticizer content is particularly preferably between 20 and 60 phr.

• • Manuelle und maschinelle Verarbeitung möglich
• • Kurzer Abriss
• • Gute Beständigkeit gegen Chemikalien und gegen KFZ-Betriebsmittelflüssigkeiten
• • Legt sich durch hohe Schmiegsamkeit faltenfrei um alle Unebenheiten
• • Nach der Montage unverändert günstige Materialeigenschaften auch bei wechselnden Temperaturen
• • Ausgezeichnete Alterungsbeständigkeit
• • Sehr gute Kälteflexibilität und Kältebeständigkeit
• • Hochtemperaturbeständig

These films are characterized by various advantages, which favors their use.

• • Manual and machine processing possible
• • Short outline
• • Good resistance to chemicals and to vehicle fluids
• • Folds itself smoothly around all unevenness due to its high flexibility
• • After assembly, favorable material properties, even at changing temperatures
• • Excellent aging resistance
• • Very good cold flexibility and cold resistance
• • High temperature resistant

Further Preferably, the PSA can be said to plasticizer-containing polyolefin or PVC films for bandaging of cables.

Especially Advantageously, the tape can be spiral-shaped Sheathing of an elongated material, in particular a cable set, use.

To Coating of the PSA on said soft film carrier results in a pressure-sensitive adhesive tape that meets the requirements of a soft film pressure-sensitive adhesive tape for cable bandaging with regard to tack, adhesive power, Cohesion and Abrolligenschaften fully met.

Just the combination of the butadiene / acrylate copolymer dispersion with resin dispersions leads to an adhesive that is suitable for soft film adhesive tapes is outstanding.

Contrary Expect and surprising for the expert the hydrazide crosslinking of the PSA results in migration of plasticizers from the film is significantly restricted.

The Hydrazide crosslinking makes it difficult to migrate the plasticizer the film and thus stabilizes the adhesive properties of the pressure-sensitive adhesive, in addition to it by the Abreagieren the carboxyl groups present in the backbone polymer, the hydrophilicity of the pressure-sensitive adhesive reduces what the water sensitivity of a Complementing the adhesive tape prepared adhesive reduced.

The for pressure-sensitive adhesive dispersions previously known crosslinking systems such as epoxies or isocyanates do not lead to the total expected success. Aziridines divorced due to toxicity from, and metal chelates such as Aluminiumacetylacetonate often lead to strong in the non-neutral area Discoloration.

in the Case of use of the PSA in a cable bandaging used tape with a film carrier is straight stopping the migration of the plasticizers from the film into the Adhesive and in the sheath of the protected cable of very high practical significance.

The Adhesive adhesive data are obtained by the migration the plasticizer changes to a degree, the one Excludes interaction with the substrate.

Usually the plasticizers destroy the plastic casing of the plasticizer Cables, which can lead to short circuits. In the worst Case develops from this a fire of the device or motor vehicle, in which the cables are located.

This is prevented according to the invention.

in the The invention will be described in more detail below by way of examples explains, without thereby limiting the Subject of the invention is intended.

The Testing of the peel strength (bond strength) based on PSTC-1. A 2 cm wide strip of tape is used on a ground steel plate as a test substrate by doubly rolling over twice with five times glued to a 5 kg roll. The plate is clamped, the tape over its free end on a tensile testing machine under a peel angle subtracted from 180 ° at a speed of 300 mm / min, and determines the necessary force. The measurement results are given in N / cm and averaged over three measurements. All measurements are taken in a conditioned room at 23 ° C and 50% relative humidity.

Examples

example 1

A dispersion adhesive composed of 50 parts by weight of a carboxylated butadiene / acrylate dispersion having a butadiene content of about 70% by weight (XZ 91964.00, butadiene / acrylate dispersion having a solids content of 50% by weight from Dow), 50 parts by weight of Tacolyn 5193 (hydrocarbon resin dispersion from Eastman), 1 part by weight of Irganox 1520 SE (4,6-bis (octylthiomethyl) -o-cresol) as an antioxidant and 2 parts by weight of sebacic dihydrazide are continuously treated with a wire bar coated with a layer thickness of 25 g / m ² on an equipped with a Polyacrylatvorstrich 85 micron thick soft PVC film. The data are based on the solids content. Technical conditions: Machine: Laboratory coating plant of width 30 cm Commissioned by: coating bar Support web speed: 3.0 m / min

The coated material is then thermally dried. drying: Laboratory drying oven 5 minutes: 105 ° C

Subsequently a 24-hour conditioning takes place at room temperature.

Storage:

The Patterns were glued to uncoated substrate and stored.

The Bonding was measured on steel.

As a second option, a rapid storage for 3 hours at 70 ° C or as a third option, a storage of 4 weeks at room temperature. Adhesive data: Fresh Value: Adhesive force / steel: 1.1 N / cm After storage 3 hours 70 ° C: Bond strength / steel: 0.8 N / cm After storage for 4 weeks room temperature: Bond strength / steel: 0.8 N / cm

Example 2

A dispersion adhesive consisting of 50 parts by weight of a carboxylated butadiene / acrylate dispersion having a butadiene content of 70 wt .-% (XZ 91964.00, butadiene / acrylate dispersion having a solids content of 50 wt .-% of Dow), 50 wt Tacolyn 5193 (Eastman hydrocarbon resin dispersion), 1 part by weight of Irganox 1520SE and 1 part by weight of adipic dihydrazide are continuously coated with a wire bar at a thickness of 25 g / m ² on a 85 μm-thick soft finished with a polyacrylate precursor -PVC film coated. The data are based on the solids content. Technical conditions: Machine: Laboratory coating plant of width 30 cm Commissioned by: coating bar Support web speed: 3.0 m / min

The coated material is then thermally dried. drying: Laboratory drying oven 5 minutes: 105 ° C

Subsequently a 24-hour conditioning takes place at room temperature.

Storage:

The Patterns were glued to uncoated substrate and stored.

The Bonding was measured on steel.

As a second option, a rapid storage for 3 hours at 70 ° C or as a third option, a storage of 4 weeks at room temperature. Adhesive data: Fresh Value: Bond strength / steel: 1.0 N / cm After storage 3 hours 70 ° C: Bond strength / steel: 0.8 N / cm After storage for 4 weeks room temperature: Adhesive force / steel: 0.85 N / cm

Example 3

A dispersion adhesive consisting of 50 parts by weight of a carboxylated butadiene / acrylate dispersion having a butadiene content of 70 wt .-% (XZ 91964.00, butadiene / acrylate dispersion having a solids content of 50 wt .-% of Dow), 50 wt Parts Dermulsene DT (terpene phenolic resin dispersion from DRT), 1 part by weight Irganox 1520SE and 1 part by weight adipic dihydrazide are continuously applied with a wire bar with a layer thickness of 25 g / m ² on a 85 μm thick soft finished with a polyacrylate precursor -PVC film coated. The data are based on the solids content. Technical conditions: Machine: Laboratory coating plant of width 30 cm Commissioned by: coating bar Support web speed: 3.0 m / min

The coated material is then thermally dried. drying: Laboratory drying oven 5 minutes: 105 ° C

Subsequently a 24-hour conditioning takes place at room temperature.

Storage:

The Patterns were glued to uncoated substrate and stored.

The Bonding was measured on steel.

As a second option, a rapid storage for 3 hours at 70 ° C or as a third option, a storage of 4 weeks at room temperature. Adhesive data: Fresh Value: Adhesive force / steel: 0.9 N / cm After storage 3 hours 70 ° C: Bond strength / steel: 0.6 N / cm After storage for 4 weeks room temperature: Bond strength / steel: 0.6 N / cm

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 10033716 A1 [0006]
• - DE 10101333 A1 [0006]
• - US 4931494 A [0008]
• US 2006/247367 A1 [0008]
• US 2004/143058 A1 [0008]

Cited non-patent literature

• - Donatas Satas, Handbook of Pressure Sensitive Adhesive Technology, 2nd Edition Resin Dispersion by Anne Z. Casey, pages 545 to 566 [0027]
• EN 29092 (1988) [0044]

Claims (9)

Pressure-sensitive adhesives based on a dihydrazide crosslinked water-based butadiene / acrylate copolymer dispersion with a Butadiene content greater than 30 wt .-%, preferably greater 55 wt .-% based on the total solids content of butadiene and Acrylate with a resin dispersion and / or optionally one Aging agent dispersion is mixed. Pressure-sensitive adhesive according to Claim 1, characterized that the dihydrazides used for crosslinking aliphatic or aromatic dihydrazides are, preferably water-soluble Dihydrazides such as adipic dihydrazide or sebacic dihydrazide. Pressure-sensitive adhesive according to Claim 1 or 2, characterized that the proportion of dihydrazides used for crosslinking in the Butadiene / acrylate dispersion before crosslinking between 0.2% by weight and 10% by weight, preferably 0.5% by weight and 5% by weight. Pressure-sensitive adhesive according to at least one of the claims 1 to 3, characterized in that the PSA physically is crosslinked, in particular by electron beams. Pressure-sensitive adhesive according to at least one of the previous Claims, characterized in that the pressure-sensitive adhesive Additives are added such as rubbers, fillers, soft resins, oils or emulsifiers. Pressure-sensitive adhesive according to at least one of the previous Claims, characterized in that the butadiene / acrylate copolymer dispersion of the type of a carboxylated butadiene / acrylate copolymer dispersion. Pressure-sensitive adhesive according to at least one of the previous Claims, characterized in that the carboxylated Butadiene / acrylate copolymer dispersion, in particular below 10 wt .-%, preferably below 5 wt .-% based on the monomer content of a carboxyl-containing comonomer, in particular acrylic acid, im Copolymer contains. Use of a pressure-sensitive adhesive according to at least one of the preceding claims on flexible films, preferably from Type of plasticizer-modified PVC or plasticizer-containing Olefins, more preferably with plasticizer contents between 20 and 60 phr. Use of a pressure-sensitive adhesive according to at least one of the preceding claims on plasticizer-containing polyolefin or PVC films for bandaging cables.