| abstract |
Process for the preparation of crosslinked acrylic PSAs, characterized in that DOLLAR A. First of all, free radical (co) polymerization polyacrylates are produced from the following monomers: DOLLAR A (d) acrylic and methacrylic acid monomers of the following structure DOLLAR F1 with R¶1¶ = H or CH¶3¶ DOLLAR A and R¶ 2¶ = an alkyl chain with 2-20 carbon atoms DOLLAR A with a share of 45-99.5% by weight of the monomer mixture, DOLLAR A (e) one or more carboxylic acid anhydrides which contain olefinic double bonds, DOLLAR A with a share from 0.5-25% by weight of the monomer mixture, DOLLAR A (f) further functional groups A possessing olefinically unsaturated monomers with a share of 0-30% by weight of the monomer mixture, DOLLAR A È the polymers thus produced to a polyacrylate composition be concentrated, the solvent content of which is 2% by weight, DOLLAR A È further monomers are added to the polyacrylate composition, these monomers having at least two functional groups B and C, the groups B being polymer-analogous Re with the carboxylic anhydrides actions and the groups C are crosslinkable groups, DOLLAR A È there is a reaction between the functional groups B and the carboxylic acid anhydride, which links the monomers containing the functional groups B to the polymers as side chains, DOLLAR A after the reaction between the functional groups B and the carboxylic anhydride is crosslinked by high-energy radiation. |