| 摘要 |
<p>The invention provides a method for obtaining an isobutene polymer with a regulated structure in a specified solvent system under industrially more advantageous conditions, and relates to a process for producing an isobutene polymer with functional terminal groups by using the following essential components (A) to (D) at a temperature of -100 to 0 °C: (A) a cationically polymerizable monomer containing isobutene; (B) an organic compound represented by general formula (1), serving as both a polymerization initiator and a chain transfer agent (wherein X represents halogen, RO- or RCOO- (R being a monovalent organic group); R3 represents a polyvalent aromatic group, or an (un)substituted polyvalent aliphatic hydrocarbon group; R?1 and R2¿ may be the same or different from each other and each represents hydrogen or an (un)substituted monovalent hydrocarbon group, provided when R3 is a polyvalent aliphatic hydrocarbon group, either R1 or R2 is not hydrogen; and n is an integer of 1 to 6); (C) an aprotic solvent; and (D) a Lewis acid. This process is characterized in that the component (C) has a permittivity of 2.0 to 5.5 at 20 °C.</p> |
