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A pressure sensitive adhesive composed of a mixture comprisinga) a styrene block copolymer having a star-shaped structure and a molecular weight Mw of more than 300,000 g/mol, or having elastomer blocks which contain more than 30% by weight of 1,2-linked diene in their block structure, or both, and

A pressure sensitive adhesive composed of a mixture comprisinga) a styrene block copolymer having a star-shaped structure and a molecular weight Mw of more than 300,000 g/mol, or having elastomer blocks which contain more than 30% by weight of 1,2-linked diene in their block structure, or both, and which is crosslinkable by exposure to UV-light or electron beams, andb) one or more block copolymers composed of vinylaromatic blocks and elastomer blocks, the block polyvinylaromatic content being greater than 20%, andc) one or more tackifier resins.

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1. A double-sided stretchable pressure sensitive adhesive sheet strip, which, when bonded to a substrate is detachable from said substrate by stretching, said pressure sensitive adhesive sheet strip being formed from a composition comprising a mixture of:a) a styrene block copolymer having a star-sh

1. A double-sided stretchable pressure sensitive adhesive sheet strip, which, when bonded to a substrate is detachable from said substrate by stretching, said pressure sensitive adhesive sheet strip being formed from a composition comprising a mixture of:a) a styrene block copolymer having a star-shaped structure and a molecular weight Mw of more than 300,000 g/mol, or having elastomer blocks which contain more than 30% by weight of 1,2-linked diene in their block structure, and which is crosslinkable by exposure to UV-light or electron beams, and b) one or more block copolymers having polyvinylaromatic blocks and elastomer blocks, the polyvinylaromatic block content being greater than 20% by weight, and c) one or more tackifier resins. 2. A single-sided stretchable pressure sensitive adhesive sheet strip, the side opposite the adhesive side being neutralized, which, when bonded to a substrate is detachable from said substrate by stretching, said pressure sensitive adhesive sheet strip being formed from a composition comprising a mixture of:a) a styrene block copolymer having a star-shaped structure and a molecular weight Mw of more than 300,000 g/mol, or having elastomer blocks which contain more than 30% by weight of 1,2-linked diene in their block structure, and which is crosslinkable by exposure to UV-light or electron beams, and b) one or more block copolymers having polyvinylaromatic blocks and elastomer blocks, the polyvinylaromatic block content being greater than 20% by weight, and c) one or more tackifier resins. 3. The adhesive as claimed in claim 1 or 2, wherein the block copolymers according to 1b) have polystyrene end blocks.4. The adhesive as claimed in claim 1 or 2, wherein the block copolymers have a polyvinylaromatics fraction of from 20 to 40% by weight, and/or a triblock content of more than 60% by weight, or both.5. The adhesive as claimed in claim 4, wherein said polyvinylaromatic fraction is from 25% to 35% by weight.6. The adhesive as claimed in claim 4, wherein said triblock content is more than 75% by weight.7. The adhesive as claimed in claim 1 or 2, wherein the styrene block copolymer according to 1a) comprises 1,2-linked polybutadiene or polyisoprene.8. The adhesive as claimed in claim 1 or 2, wherein the styrene block copolymer is formed of styrene-butadiene block copolymer or styrene-isoprene block copolymer.9. The adhesive as claimed in claim 1 or 2, wherein the styrene block copolymer has polydiene-containing elastomer blocks.10. The adhesive as claimed in claim 9, wherein said polydiene-containing elastomer blocks are copolymers of two or more different 1,3-dienes.11. The adhesive as claimed in claim 1 or 2, wherein the styrene block copolymer is functionalized.12. The adhesive as claimed in claim 11, wherein said styrene block copolymer is functionalized by being maleic anhydride-modifid or silane-modified.13. The adhesive as claimed in claim 1 or 2, comprising 20 to 70% by weight of styrene block copolymer, based on the weight of the adhesive.14. The adhesive as claimed in claim 13, wherein said amount of styrene block copolymer is 30 to 60% by weight.15. The adhesive as claimed in claim 14, wherein said amount of styrene block copolymer is 35 to 55% by weight.16. The adhesive as claimed in claim 1 or 2, further comprising blend components selected from the group consisting of plasticizers, aging inhibitors, processing assistants, fillers, dyes, optical brighteners, and stabilizers.17. The adhesive as claimed in claim 1 or 2, further comprising crosslinking promoters.18. A method for producing a pressure sensitive adhesive sheet strip for providing a bond which can be parted again by stretching in the direction of the bond plane, which comprises applying the pressure sensitive adhesive of claim 1 or 3 to an elastically-stretchable backing.19. A process for preparing the pressure sensitive adhesive for the pressure sensitive adhesive sheet strips according to claims 1 and 2, which comprises mixing(i) a styrene block copolymer having a star-shaped structure and a molecular weight Mw of more than 300,000 g/mol, or having elastomer blocks containing more than 30% of 1,2-linked diene in the elastomer block structure, or both, and which is crosslinkable by exposure to UV-light or electron beams, and (ii) one or more block copolymers composed of polyvinylaromatic blocks and elastomer blocks, the polyvinylaromatic block content being greater than 20%, and (iii) one or more tackifier resins with elastomer blocks, and exposing the mixture to UV-light or electron beams.