摘要:
Process for the continuous solvent-free and mastication-free production of self-adhesive compositions based on non-thermoplastic elastomers in a continuously operating apparatus having a filling section and a compounding section, comprising a) feeding the solid components of the self-adhesive composition, such as elastomers and resins, into the filling section of the apparatus, optionally feeding of fillers, colorants and/or crosslinkers, b) transferring the solid components of the self-adhesive composition from the filling section to the compounding section, c) adding the liquid components of the self-adhesive composition, such as plasticizers, crosslinkers and/or further tackifier resins to the compounding section, d) preparing a homogeneous self-adhesive composition in the compounding section, and e) discharging the self-adhesive composition.
摘要:
Adhesive tape comprising a backing comprising an oriented thermoplastic film and a coating comprising a solventlessly prepared pressure-sensitive adhesive composition based on non-thermoplastic elastomers such as natural rubber and tackifying resins, characterized in that the pressure-sensitive adhesive composition comprises a thermally labile crosslinking system.
摘要:
Process for the continuous solvent-free and mastication-free production of self-adhesive compositions based on non-thermoplastic elastomers in a continuously operating apparatus having a filling section and a compounding section, comprising a) feeding the solid components of the self-adhesive composition, such as elastomers and resins, into the filling section of the apparatus, optionally feeding of fillers, colorants and/or crosslinkers, b) transferring the solid components of the self-adhesive composition from the filling section to the compounding section, c) adding the liquid components of the self-adhesive composition, such as plasticizers, crosslinkers and/or further tackifier resins to the compounding section, d) preparing a homogeneous self-adhesive composition in the compounding section, and e) discharging the self-adhesive composition, f) coating the self-adhesive composition on a web-form material, where the coating of the web-form material is carried out using a multi-roll applicator unit, preferably using a 2- to 5-roll applicator unit, particularly preferably using a 4-roll applicator unit, so that the self-adhesive composition is shaped to the desired thickness as it passes through one or more roll nips, and where the rolls of the applicator unit can be individually set to temperatures from 20° C. to 150° C.
摘要:
In a continuous two-stage process for preparing solvent-free polyacrylate hotmelt pressure sensitive adhesives which is gentle on the polymer and redeploys the solvent used in the process the following steps are carried out: polymerizing a self-adhesive pressure sensitive adhesive in solution, the solvent having a low vapor pressure; continuously mixing the polymer solution with antioxidants and preheating the mixture under superatmospheric pressure without boiling it; concentrating the polymer solution to a residual solvent content of less than 0.1% by weight in a concentrating extruder under the effect of reduced pressure and elevated temperatures; condensing, collecting, and re-using the solvent stripped off in the extruder; compounding the abovementioned solvent-freed hotmelt pressure sensitive adhesive with tackifying resins, fillers, stabilizers, crosslinkers or other additives in a second extruder at a moderate melt temperature; transferring the blended solvent-free self-adhesive pressure sensitive adhesive to a downstream coating unit.
摘要:
A pressure-sensitive adhesive comprising organic fillers, obtainable by a process in which a thermal crosslinker is added in the melt to a polyacrylate copolymer (“polyacrylate”) based on acrylic esters and/or methacrylic esters, at least a fraction of which contains primary hydroxyl groups, at least one organic filler has been or is added to the polyacrylate, the polyacrylate provided with the crosslinker and the filler is conveyed to a coating unit, where it is applied to a web-form coat of a further material and, following application, is homogeneously crosslinked, a process as outlined above, and adhesive tapes furnished with the pressure-sensitive adhesive.
摘要:
A UV-crosslinkable polyacrylate pressure-sensitive adhesive composition comprising a polyacrylate having photoinitiator units incorporated therein by polymerization and being produced by a free-radical solvent-free polymerization process.
摘要:
The invention relates to a process for the preparation of acrylate-based pressure-sensitive hot-melt adhesives by irradiation on a substrate, characterized in thata) at least one acrylic monomer is copolymerized with N-tert.-butylacrylamide (TBA), whereinb) the reaction mixture (of a) to be polymerized can additionally contain one or more ethylenically unsaturated compounds which do not belong to the group of acrylic monomers of a),c) the resulting solid polymer is heated and is applied in a form which is capable of flowing or a liquid form to a substrate, it being possible for the compositions of steps a) to c) to contain additives and auxiliaries if appropriate, andd) the coated substrate is irradiated with high-energy radiation.
摘要:
A UV-crosslinkable polyacrylate pressure-sensitive adhesive composition having a polyacrylate having photoinitiator units incorporated therein by polymerization and being produced by a free-radical solvent-free polymerization process.