Pressure sensitive adhesive and its preparation
First Claim
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1. A pressure sensitive adhesive 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, or both, 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.
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Abstract
A pressure sensitive adhesive composed of a mixture comprising
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, or both, and which is crosslinkable by exposure to UV-light or electron beams, and
b) one or more block copolymers composed of vinylaromatic blocks and elastomer blocks, the block polyvinylaromatic content being greater than 20%, and
c) one or more tackifier resins.
29 Citations
19 Claims
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1. A pressure sensitive adhesive comprising a mixture of:
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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, or both, 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A process for preparing a pressure sensitive adhesive for pressure sensitive adhesive sheet strips for providing a bond which can be parted by stretching in the direction of the bond plane, 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.
Specification