COPYLIMEROS OF MULTI-RAMIFIED STYRENE-ISOPRENE-BUTADIENE RADIAL BLOCKS, AND COMPOSITIONS AND ARTICLES CONTAINING THESE BLOCK COPOLYMERS.

摘要

THE INVENTION IS DIRECTED TO THE FORMULA RADIAL COPOLYMERS BLOCKS: (PS-PI-PB {SUB, N} X), WHERE PS IS POLYTIRENE, PI IS POLYISOPRENE, PB IS POLYUTHYDENE AGENT, X IS THE RESIDUE OF A MULTIFUNCTIONED COUPLED AGENT IN THE PRODUCTION OF THE RADIAL COPOLYMER BLOCK AND N IS A NUMBER GREATER OR EQUAL TO 3, REPRESENTATIVE OF THE NUMBER OF BRANCHES ADDED AX; PRESSURE SENSITIVE ADHESIVE COMPOSITIONS INCLUDING SUCH RADIAL COPOLYMER BLOCKS AND MANUFACTURING ITEMS PRODUCED FROM THEM. THE COMPONENT PS OF THE RADIAL COPOLYMERS BLOCK OF THIS INVENTION INCLUDES FROM 14 TO 24 PARTS PER 100 PARTS BY WEIGHT OF THE RADIAL COPOLYMER BLOCK; THE MOLECULAR WEIGHT (AS EQUIVALENT OF THE POLYSTYRENE) OF THE RADIAL COPOLYMER BLOCK IS BETWEEN 200,000 TO 400,000; AND THE AMOUNT IN WEIGHT OF POLIBUTADIEN IN THE PI-PB SEGMENT IS LESS THAN 50 PERCENT OF THE WEIGHT.