| abstract |
(57) Summary The present invention provides the formula: (pS-pI-pB) n X, where pS is polystyrene, pI is polyisoprene, pB is polybutadiene and X is the production of radial block copolymers. Which is a residue of a polyfunctional binder used in, n is 3 or more, and is a number representing a numerical value of a limb binding to X), and a pressure-sensitive adhesive containing the radial block copolymer. It relates to compositions and products made therefrom. The pS component of the radial block copolymer of the present invention is present in an amount of about 14 to about 24 parts by weight, based on 100 parts of the radial block copolymer, and the molecular weight (as polystyrene equivalent) of the radial block copolymer is in the range of about 200,000 to about 400,000. And the weight of polybutadiene in the pS-pI segment is less than 50% by weight. |