Styrene-butadiene rubber HIGH content of units of styrene and vinyl and narrow molecular weight distribution and method of its preparation

摘要

1. A polymer having at least the following characteristics: (a) a styrene block content with the number of consecutive units of styrene to 6, from about 15 to about 35 weight percent of the total styrene content in the polymer, (b) a vinyl content between about 25 to about 80 weight percent of the total polymerized 1,3-diene; (c) a styrene content from about 35 to about 75 weight percent of the total weight of the polymer; and (d) a molecular weight distribution (Mw / Mn) equal to or less 1,5.2. according to claim Polymer 1, characterized in that it has at least the following additional characteristics:. (d) the content of block styrene containing more than 4 consecutive units of styrene, from about 60 to about 80 weight percent of the total styrene content of the polymer, preferably styrene content of the block containing more than 6 consecutive units of styrene, from about 15 to about 30 weight percent of the total styrene content in the polymer, and more preferably a styrene block content Containing more than six consecutive units of styrene, from about 20 to about 30 weight percent of the total styrene content in polimere.3. The polymer according to any one of the preceding claims, characterized in that it has a styrene content from about 35 and up to about 65 weight percent of the total styrene content, preferably from about 50 to about 60.4. The polymer of Claim. 1 or 2, characterized in that it has a molecular weight distribution (Mw / Mn) of from about 1.05 to about 1.5, preferably about