BLOCK COPOLYMERS, COMPOSITIONS CONTAINING THEM, AND FOOTWEAR CONSTRUCTIONS COMPRISING A TEXTILE UPPER, A SOLING AND A FOXING STRIP

摘要

1,222,783. Boots &c. SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ N.V. 7 July, 1969 [8 July, 1968], No. 34165/69. Heading A3B. [Also in Division C3] A footwear construction comprises a textile upper, a soling and a foxing strip in which the foxing strip or both the soling and foxing strip is or are prepared from composition comprising a block copolymer of formula A-B-(B-A) n where each A is polystyrene, B is polyisoprene, n is 1 to 5 where each A block has a molecular weight of 30,000 to 50,000 and the copolymer has an A block content of 45 to 55%, a similar copolymer derived from B as polybutadiene (optional), polystyrene, and an extender oil (essential) and a filler (optional).