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Pressure-sensitive adhesives containing at least one functionalized polymer or block polymer having a weight average of the molar mass distribution of between 5,000 g/mol and 200,000 g/mol and a difference between Mp and Mmin which is lower than 25,000 g/mol, where Mp represents the peak molar mass

Pressure-sensitive adhesives containing at least one functionalized polymer or block polymer having a weight average of the molar mass distribution of between 5,000 g/mol and 200,000 g/mol and a difference between Mp and Mmin which is lower than 25,000 g/mol, where Mp represents the peak molar mass of a monomodal polymer or the peak molar mass of the smallest mode in a bimodal or multimodal polymer and Mmin represents the lowest molar mass in the molar mass distribution, defined at each point where the cumulative frequency of the molar mass distribution has a value of 0.05, the functionalized polymer or block polymer carries at least one type of functionalization that can be used for a subsequent cross-linking and the at least one type of functionalization of the functionalized polymer results from the use of at least one type of functionalized monomer during the production of the functionalized polymer.

대표청구항 ▼

The invention claimed is: 1. A pressure-sensitive adhesive comprising at least one functionalized polymer comprised of more than 50% by weight (meth)acrylate monomers, wherein the weight average of the molar mass distribution is situated between 5000 g/mol and 200 000 g/mol and the difference betwe

The invention claimed is: 1. A pressure-sensitive adhesive comprising at least one functionalized polymer comprised of more than 50% by weight (meth)acrylate monomers, wherein the weight average of the molar mass distribution is situated between 5000 g/mol and 200 000 g/mol and the difference between Mp and Mmin is less than 25 000 g/mol, where (a) Mp is the peak molar mass of a monomodal polymer or the peak molar mass of the smallest mode in a bimodal or multimodal polymer, (b) Mmin is the smallest molar mass occurring in the molar mass distribution, defined on the basis of the point at which the cumulative frequency of the molar mass distribution has a value of 0.05, (c) the functionalized polymer is linear, branched or star-shaped in structure, (d) the functionalized polymer carries at least one kind of fictionalizations, which can be utilized for subsequent crosslinking of the functionalized polymer, (e) at least 50% of the polymer chains of the functionalized polymer carry at least two functionalizations, (f) at least 75% of the polymer chains of the functionalized polymer carry at least one functionalization; and (g) the at least one kind of functionalization of the functionalized polymer results from the use of at least one variety of a functionalized monomer in the preparation of the functionalized polymer. 2. A pressure-sensitive adhesive comprising at least one functionalized block copolymer comprised of more than 50% by weight (meth)acrylate monomers, wherein the weight average of the molar mass distribution is situated between 5000 g/mol and 200 000 g/mol and the difference between Mp and Mmin is less than 25 000 g/mol, where (a) Mp is the peak molar mass of a monomodal block copolymer or the peak molar mass of the smallest mode in a bimodal or multimodal block copolymer, (b) Mmin is the smallest molar mass occurring in the molar mass distribution, defined on the basis of the point at which the cumulative frequency of the molar mass distribution has a value of 0.05, (c) the functionalized block copolymer is linear, branched, star-shaped or grafted in structure, (d) at least one block of the functionalized block copolymer carries at least one kind of functionalization, which can be utilized for subsequent crosslinking of the functionalized block copolymer, (e) at least 50% of at least one block of the block copolymer chains of the functionalized block copolymer carry at least two functionalizations, (f) at least 75% of at least one block of the block copolymer chains of the functionalized block copolymer carry at least one functionalization, (g) its at least one kind of functionalization of the functionalized block copolymer results from the use of at least one variety of a functionalized monomer in the preparation of the functionalized block copolymer. 3. The pressure-sensitive adhesive as claimed in claim 1, wherein the functionalized polymer is obtained by polymerization of a monomer mixture and the monomer mixture from which the functionalized polymer is obtained by polymerization contains up to 20% of at least one kind of a functionalized monomer. 4. The pressure-sensitive adhesive as claimed in claim 1, wherein the functionalized polymer is obtained by polymerization of a monomer mixture of at least one variety of functionalized monomers and one variety of unfunctionalized monomers, and the unfunctionalized monomers for preparing the functionalized polymers are taken from one or a combination of unfunctionalized α,β-unsaturated esters of the general structure CH2═CH(R1)(COOR2) where R1═H or CH3 and R2 =linear, branched or cyclic, saturated or unsaturated alkyl radicals having 1 to 30 carbon atoms. 5. The pressure-sensitive adhesive as claimed in claim 1, wherein the functionalized monomers for preparing the functionalized polymers are taken from one or a combination of unfunctionalized α,β-unsaturated esters of the general structure CH2═CH(R1)(COOR3) where R1=H or CH3 and R3=H or linear, branched or cyclic, saturated or unsaturated alkyl radicals having 1 to 30 carbon atoms and containing at least one functional group which includes at least one atom that is different from carbon and from hydrogen. 6. The pressure-sensitive adhesive as claimed in claim 5, wherein the functionalized polymers are prepared from a monomer mixture of at least one variety of functionalized monomers and at least one variety of unfunctionalized monomers, and the functionalized monomers are taken from one or a combination of functionalized α,β-unsaturated carbonyl compounds selected from the group consisting of acrylic acid, methacrylic acid, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 3-hydroxypropyl acrylate, 3-hydroxypropyl methacrylate, 4-hydroxybutyl acrylate, 4-hydroxybutyl methacrylate, itaconic acid, crotonic acid, acrylamide, methacrylamide, N-methylolacrylamide, N-methylolmethacrylamide, glycidyl acrylate, glycidyl methacrylate, vinyl alcohol, 2-hydroxyethyl vinyl ether, 3-hydroxypropyl vinyl ether, 4-hydroxybutyl vinyl ether, maleic anhydride and itaconic anhydride. 7. A process for preparing a pressure-sensitive adhesive as claimed in claim 1, comprising (a) preparing a functionalized polymer of claim 1 by a controlled-growth, quasi-living or living, free-radical polymerization process; and (b) crosslinking the functionalized polymer. 8. The process as claimed in claim 7, wherein the functionalized polymer is brought to chain extension and/or crosslinking by addition of a coupling reagent and, optionally, catalysts, initiators or activators. 9. The process as claimed in claim 8, wherein the chain extension and/or crosslinking is initiated by the influence of thermal energy and/or actinic radiation. 10. The process as claimed in claim 8, wherein chain extension reaction and/or crosslinking reaction takes place during and/or after coating. 11. A self-adhesive product, comprising at least one pressure-sensitive adhesive of claim 1. 12. A self-adhesive product comprising at least one pressure-sensitive adhesive produced by the process of claim 7. 13. The pressure-sensitive adhesive of claim 1, wherein said weight average of the molar mass distribution is between 10,000 g/mol and 100,000 g/mol. 14. The pressure-sensitive adhesive of claim 1, wherein said difference between Mp and Mmin is less than 15,000 g/mol. 15. The pressure-sensitive adhesive of claim 2, wherein said weight average of the molar mass distribution is between 10,000 g/mol and 100,000 g/mol. 16. The pressure-sensitive adhesive as claimed in claim 2, wherein the functionalized block polymer is prepared to an extent of more than 50% from (meth)acrylate monomers. 17. The pressure-sensitive adhesive as claimed in claim 2, wherein the functionalized block polymer is obtained by polymerization of a monomer mixture and the monomer mixture from which the functionalized block polymer is obtained by polymerization contains up to 20% of at least one kind of a functionalized monomer. 18. The pressure-sensitive adhesive as claimed in claim 2, wherein the functionalized block polymer is obtained by polymerization of a monomer mixture of at least one variety of functionalized monomers and one variety of unfunctionalized monomers, and the unfunctionalized monomers for preparing the functionalized block polymer are taken from one or a combination of unfunctionalized α,β-unsaturated esters of the general structure CH2═CH(R1)(COOR2) where R1=H or CH3 and R2=linear, branched or cyclic, saturated or unsaturated alkyl radicals having 1 to 30 carbon atoms. 19. The pressure-sensitive adhesive as claimed in claim 2, wherein the functionalized monomers for preparing the functionalized block polymers are taken from one or a combination of unfunctionalized α,β-unsaturated esters of the general structure CH2═CH(R1)(COOR3) where R1=H or CH3 and R3=H or linear, branched or cyclic, saturated or unsaturated alkyl radicals having 1 to 30 carbon atoms and containing at least one functional group which includes at least one atom that is different from carbon and from hydrogen. 20. The pressure-sensitive adhesive as claimed in claim 19, wherein the functionalized polymers are prepared from a monomer mixture of at least one variety of functionalized monomers and at least one variety of unfunctionalized monomers, and the functionalized monomers are taken from one or a combination of functionalized α,β-unsaturated carbonyl compounds selected from the group consisting of acrylic acid, methacrylic acid, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 3-hydroxypropyl acrylate, 3-hydroxypropyl methacrylate, 4-hydroxybutyl acrylate, 4-hydroxybutyl methacrylate, itaconic acid, crotonic acid, acrylamide, methacrylamide, N-methylolacrylamide, N-methylolmethacrylamide, glycidyl acrylate, glycidyl methacrylate, vinyl alcohol, 2-hydroxyethyl vinyl ether, 3-hydroxypropyl vinyl ether, 4-hydroxybutyl vinyl ether, maleic anhydride and itaconic anhydride. 21. A process for preparing a pressure-sensitive adhesive as claimed in claim 2, comprising (a) preparing a functionalized block polymer claim 2 by a controlled-growth, quasi-living or living, free-radical polymerization process; and (b) crosslinking the functionalized polymer. 22. The process as claimed in claim 21, wherein the functionalized polymer is brought to chain extension and/or crosslinking by addition of a coupling reagent and, optionally, catalysts, initiators or activators. 23. The process as claimed in claim 22, wherein the chain extension and/or crosslinking is initiated by the influence of thermal energy and/or actinic radiation. 24. The process as claimed in claim 22, wherein chain extension reaction and/or crosslinking reaction takes place during and/or after coating. 25. A self-adhesive product, comprising at least one pressure-sensitive adhesive of claim 2. 26. A self-adhesive product comprising at least one pressure-sensitive adhesive produced by the process of claim 21. 27. The pressure-sensitive adhesive of claim 2, wherein said weight average of the molar mass distribution is between 10,000 g/mol and 100,000 g/mol. 28. The pressure-sensitive adhesive of claim 2, wherein said difference between Mp and Mmin is less than 15,000 g/mol. 29. The pressure-sensitive adhesive of claim 2, wherein said weight average of the molar mass distribution is between 10,000 g/mol and 100,000 g/mol.