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    • 14. 发明专利
    • DE10242942A1
    • 2004-03-18
    • DE10242942
    • 2002-09-16
    • BAYER AG
    • GRUEN MICHAELMUECKE SYLVIAWRANA CLAUS
    • B60C1/00C08C19/44C08F8/00C08F36/04C08L15/00C08F236/04C08F236/06C08J3/24C08K5/151C08F4/46
    • Branched and coupled polymers are based on optionally conjugated dienes and vinyl aromatic compounds as well as polyfunctional organic compounds having at least 4 groups capable of coupling whereby at least 60% of the coupled polymers have a degree of branching of greater than 2 with the proviso that amount of polymer having at least 4-fold branching is greater than the amount having 3-fold branching. Branched and coupled polymers (I) are based on optionally conjugated dienes and vinyl aromatic compounds as well as polyfunctional organic compounds having at least 4 groups capable of coupling whereby the polymers (I) have a mol. wt. ratio (Mw/Mn) of 1.0-3.0, a weight average mol. wt. of 400,000-2,000,000, a glass transition temperature of -50 to -10degreesC, a 1,2-vinyl group content of 40-80% (with respect to diene groups), a degree of coupling of at least 45% whereby at least 60% of the coupled polymers (I) have a degree of branching of greater than 2 with the proviso that amount of polymer having at least 4-fold branching (with respect to 100 g polymer) is greater than the amount having 3-fold branching and the difference in solution viscosity before and after coupling is 100-400 (measured as a solution of 0.5 g polymer in 100 ml tolune at 25 degreesC using a Ubbelohde visometer). An Independent claim is included for a process for the production of polymers (I) by conventional polymerization of dienes with vinyl aromatic compounds in the presence of inert organic solvents and organic alkali metal compounds and reaction of the alkali metal terminated polymer anions that are formed with organic polyfunctional compounds that have at least 4 groups capable of coupling whereby the molar ratio of polyfunctional compounds to alkali-metal terminated polymer anions is 0.1-0.28:1.