Self-adhesive compound and use thereof in an adhesive tape
A single- or double-sidedly bonding adhesive-sheet strip having a self-adhesive composition comprising a) at least one elastomer, at least one type of polybutadiene block copolymer being used as an elastomer, b) at least one partially hydrogenated hydrocarbon resin having a softening temperature of at least 90° C., c) at least one additional hydrocarbon resin, a terpene phenol resin and/or a colophonium resin having a softening temperature of at least 90° C., d) an optional soft resin, and e) additional additives as applicable.
1. A single- or double-sidedly bonding adhesive-sheet strip, which is carrier-free and hence of only single-ply configuration, comprising a pressure-sensitive adhesive composition at least comprising:
(a) at least one elastomer, the elastomer having a fraction of at least 40 wt %, based on the total adhesive composition, and elastomer used comprising at least one kind of a polybutadiene block copolymer that is not hydrogenated in the polybutadiene block;
(b) at least one partly hydrogenated hydrocarbon resin (tackifying resin kind 1) having a softening temperature of at least 90° C.;
(c) a plasticizing resin or plasticizing resin mixture present at a fraction of not more than 6 wt %, based on a total of the pressure-sensitive adhesive composition and having a softening temperature of <25° C.;
(d) optionally at least one further hydrocarbon resin, a terpene-phenolic resin and/or a rosin having a softening temperature of at least 90° C. (tackifying resin kind 2);
(e) optionally further additives,
wherein the tan δ of the pressure-sensitive adhesive composition at application temperature (here 25° C.) at 10 rad/s is at least 0.20 and at 100 rad/s is at least 0.40, and at 10 rad/s is not more than 0.40 and at 100 rad/s is not more than 1.00.
2. The single- or double-sidedly bonding adhesive-sheet strip according to claim 1 , wherein the plasticizing resin or plasticizing resin mixture has a melt viscosity at 25° C. and 1 Hz of at least 25 Pa*s.
3. The single- or double-sidedly bonding adhesive-sheet strip according to claim 1 , wherein the fraction of the polybutadiene block copolymer or of the mixture of different polybutadiene block copolymers in the elastomer is at least 90 wt %, based on the total elastomer amount.
4. The single- or double-sidedly bonding adhesive-sheet strip according to claim 1 , at least one polybutadiene block copolymer is a triblock copolymer or a higher multiblock copolymer having at least two A blocks.
5. The single- or double-sidedly bonding adhesive-sheet strip according to claim 1 , wherein the polybutadiene block copolymers have a polyvinylaromatic fraction of 20 wt % to 40 wt %.
6. The single- or double-sidedly bonding adhesive-sheet strip according to claim 1 , wherein the fraction of the polybutadiene block copolymers, in total, based on the overall pressure-sensitive adhesive, is at least 40 wt %, and the maximum fraction of the polybutadiene block copolymers, in total, based on the total adhesive composition, is not more than 60 wt %.
7. The single- or double-sidedly bonding adhesive-sheet strip according to claim 1 , wherein elastomer used comprises an elastomer mixture consisting of A-B-A triblock copolymer and A-B diblock copolymer, the fraction of A-B-A triblock copolymer, based on the total amount of elastomer used, being at least 50 wt %.
8. The single- or double-sidedly bonding adhesive-sheet strip according to claim 1 , wherein the total tackifying resin content in the pressure-sensitive adhesive composition is at least 30 wt %, and not more than 60 wt %.
9. The single- or double-sidedly bonding adhesive-sheet strip according to claim 1 , wherein the fraction of tackifying resin kind 1 is at least 25 wt % and not more than 60 wt %, based on the total adhesive composition.
10. The single- or double-sidedly bonding adhesive-sheet strip according to claim 1 , wherein the adhesive-sheet strip is redetachable without residue or destruction by extensive stretching substantially in the bond plane.
11. The single- or double-sidedly bonding adhesive-sheet strip according to claim 1 , wherein the adhesive-sheet strip is transparent and the total transmission of the adhesive-sheet strip is >85%.
12. The single- or double-sidedly bonding adhesive-sheet strip according to claim 1 , wherein the adhesive-sheet strip is ozone resistant.
13. The single- or double-sidedly bonding adhesive-sheet strip according to claim 1 , wherein the plasticizing resin is a hydrocarbon-based or a rosin-based plasticizing resin.
14. A method comprising:
bonding an article to a hydrophilic surface wherein said article is bonded to said hydrophilic surface with the adhesive-sheet strip, according to claim 1 , or bonding the adhesive-sheet strip, according to claim 1 , between two substrates, of which at least one is transparent and/or one substrate is designed in such a way that a load can be affixed thereto.
15. The method according to claim 14 , further comprising:
detaching the adhesive-sheet strip, without residue or destruction, by extensively stretching substantially in a bond plane of the adhesive-sheet strip.
16. A single- or double-sidedly bonding adhesive-sheet strip, which is carrier-free and hence of only single-ply configuration, comprising a pressure-sensitive adhesive composition at least comprising:
(a) at least one elastomer, the elastomer having a fraction of at least 40 wt %, based on the total adhesive composition, and elastomer used comprising at least one kind of a polybutadiene block copolymer that is not hydrogenated in the polybutadiene block;
(b) at least one nonhydrogenated hydrocarbon resin (tackifying resin kind 1) having a softening temperature of at least 90° C.;
(c) at least one further resin comprising at least partly hydrogenated or disproportionated hydrocarbon resin, terpene-phenolic resin and/or rosin having a softening temperature of at least 90° C. (tackifying resin kind 2);
(d) a plasticizing resin or plasticizing resin mixture present at a fraction of not more than 6 wt %, based on a total of the pressure-sensitive adhesive composition and having a softening temperature of 25° C.; and
(e) optionally further additives,
wherein the tan δ of the pressure-sensitive adhesive composition at application temperature (here 25° C.) at 10 rad/s is at least 0.20 and at 100 rad/s is at least 0.40, and at 10 rad/s is not more than 0.40 and at 100 rad/s is not more than 1.00.
17. The single- or double-sidedly bonding adhesive-sheet strip according to claim 16 , wherein the plasticizing resin or plasticizing resin mixture has a melt viscosity at 25° C. and 1 Hz of at least 25 Pa*s.
18. The single- or double-sidedly bonding adhesive-sheet strip according to claim 16 , wherein the adhesive-sheet strip is redetachable without residue or destruction by stretching in the bond plane.
19. The single- or double-sidedly bonding adhesive-sheet strip according to claim 16 , wherein the adhesive-sheet strip is transparent and the total transmission of the adhesive-sheet strip is >85%.
20. The single- or double-sidedly bonding adhesive-sheet strip according to claim 16 , wherein the adhesive-sheet strip is ozone resistant.
21. The single- or double-sidedly bonding adhesive-sheet strip according to claim 16 , wherein the plasticizing resin is a hydrocarbon-based or a rosin-based plasticizing resin.
22. The single- or double-sidedly bonding adhesive-sheet strip according to claim 16 , wherein the fraction of tackifying resin kind 1 is at least 15 wt % and not more than 30 wt %, based on the total adhesive composition.