METHOD FOR HYDROGENATING DIENE (CO)POLYMER

• Main Authors: CAVALLO CLAUDIO, VIOLA GIAN TOMMASO, VALLIERI ANDREA
• Format: Patent
• Language: English
• Published: 25.07.2000
• Edition: 7
• Subjects: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; THEIR PREPARATION OR CHEMICAL WORKING-UP; THEIR RELEVANT APPARATUS; TRANSPORTING; TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS

PROBLEM TO BE SOLVED: To increase the rate of hydrogenation without requiring a large amount of titanium by producing a catalyst composition effective in the hydrogenation of olefinic double bonds, particularly in the selective hydrogenation of olefinic double bonds present in diene-vinylbenzene copolymers by the reaction of specified components. SOLUTION: The catalyst composition effective in the selective hydrogenation of olefinic double bonds present in styrene-butadiene and styrene-isoprene block copolymers is produced by utilizing the reaction of at least one cyclopentadienyl- transition metal complex having a composition of the formula (R)(R1)M1(R2)(R3) (R is an anion containing an η5-cyclopentadienyl ring, M1 is titanium, zirconium or the like, R2 and R3 are each an anionic group and R1 is selected from cyclopentadienyl and R2) with an alkylation composition consisting of an organometallic compound and an organic derivative of aluminum.