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US 2001/0033988 A1Published application
Structured UV-crosslinked acrylic pressure-sensitive adhesive compositions
AssigneeTesa SE
InventorsMarc Husemann, Stephan Zollner
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AssigneeTesa SE
InventorsMarc Husemann, Stephan Zollner
Estimating the term…
Structured polyacrylates obtainable by crosslinking, induced by UV irradiation, of a polymer mixture comprising the following components: a) polyacrylate copolymers of the following monomers a1) acrylic acid and/or acrylic esters of the following formula CH2=CH(R1)(COOR2), where R1=H or CH3 and R2 is an alkyl chain having 1-20 carbon atoms, at 70-99% by weight, based on component (a), a2) olefinically unsaturated monomers containing functional groups, at 0-15% by weight, based on component (a), a3) tert-butyl acrylate, at 1-15% by weight, based on component (a), and b) a photocationic initiator at 0.01-25% by weight, based on the overall polymer mixture, the structuring of the polyacrylates comprising the presence in the polyacrylates of regions of high crosslinking alongside regions of low crosslinking and/or noncrosslinked regions.
A structured polyacrylate obtainable by crosslinking, induced by UV irradiation, of a polymer mixture comprising the following components:
The polyacrylate as claimed in either of the above claims, wherein c) up to 3% by weight, based on the overall polymer mixture, of a difunctional or polyfunctional crosslinker is added to the polymer mixture.
A process for preparing structured polyacrylates by structured crosslinking of polyacrylate mixtures in accordance with one of the above claims, which comprises irradiating the base polymer mixture with ultraviolet light in such a way that only certain regions of the polymer mixture are exposed to the UV radiation.
The process for preparing structured polyacrylates by structured crosslinking of polyacrylate mixtures in accordance with one of the above claims, which comprises irradiating the base polymer mixture with ultraviolet light through a perforated mask in such a way that only certain regions of the polymer mixture are exposed to the UV radiation.
The process for preparing structured polyacrylates by structured crosslinking of polyacrylate mixtures in accordance with one of the above claims, which comprises irradiating the base polymer mixture with ultraviolet light through a film whose two-dimensional extent has regions of different UV light permeability in such a way that certain regions of the polymer mixture are exposed to different intensities of the UV radiation.
The use of the polyacrylate as claimed in one of the above claims as a pressure-sensitive adhesive composition.
The use of the polyacrylate as claimed in one of the above claims as a pressure-sensitive adhesive composition for an adhesive tape, the acrylic pressure-sensitive adhesive composition being present as a single- or double-sided film on a backing sheet.
Dependencies are inferred from the claim text.