Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymerizing in tubular or loop reactor
Reexamination Certificate
2005-02-08
2005-02-08
Teskin, Fred (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymerizing in tubular or loop reactor
C526S135000, C526S237000, C526S348700, C526S918000
Reexamination Certificate
active
06852808
ABSTRACT:
Homo- and copolymers of isobutene are prepared by continuous cationic polymerization of isobutene or mixtures of isobutene with ethylenically unsaturated comonomers in the presence of an initiator system comprising:i) a Lewis acid selected from covalent metal-halogen compounds and covalent semimetal-halogen compounds andii) at least one aprotic organic compound I having at least one functional group FG which forms a carbocation or a cationic complex with the Lewis acid under polymerization conditions in an organic solvent inert with respect to the Lewis acid, by a process in which the polymerization is carried out in a tubular flow-through reactor which has a plurality of curves having an alternating direction of curvature.
REFERENCES:
patent: 4152499 (1979-05-01), Boerzel et al.
patent: 4327201 (1982-04-01), Kennedy et al.
patent: 4946899 (1990-08-01), Kennedy et al.
patent: 5169914 (1992-12-01), Kaszas et al.
patent: 5286823 (1994-02-01), Rath
patent: 5811501 (1998-09-01), Chiba et al.
patent: 5910550 (1999-06-01), Rath
patent: 5962604 (1999-10-01), Rath
patent: 6399031 (2002-06-01), Herrmann et al.
patent: 6407186 (2002-06-01), Rath et al.
patent: 20040014911 (2004-01-01), Huffer et al.
patent: 20040015029 (2004-01-01), Lange et al.
patent: 196 34 450 (1998-03-01), None
patent: 0 145 235 (1985-06-01), None
patent: 0 206 756 (1986-12-01), None
patent: 0 265 053 (1988-04-01), None
patent: 0 273 627 (1988-07-01), None
patent: 0 481 297 (1992-04-01), None
patent: 0 671 419 (1995-09-01), None
patent: 0 713 883 (1996-05-01), None
Kennedy et al, “Designed Polymers by Carbocationic Macromolecular Engineering”, Oxford University Press, New York 1991, pp. 96-104.
Henzler, “Continuous Mixing of Fluids”, Ulmann's Encyclopedia of Industrial Chemistry, Fifth Completely Revised Edition, vol. B4, VCH Publishers, Inc. 1992, pp. 561-586.
Hüffer Stephan
Kremeskötter Jens
Lang Gabriele
Rath Hans Peter
Stöckelmann Elmar
BASF - Aktiengesellschaft
Teskin Fred
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