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9 records (took 0.025 seconds)

    6.
    发明专利
    未知

    公开(公告)号：DE3010870A1

    公开(公告)日：1981-10-01

    申请号：DE3010870

    申请日：1980-03-21

    Applicant: BASF AG

    Inventor： FAUTH KARL-HEINZ ING GRAD ,  MOHR HEINRICH DIPL CHEM DR ,  IMMEL WOLFGANG DIPL ING DR

    IPC: C08F2/06 ,  C08F4/14 ,  C08F110/10

    Abstract: A process for the preparation of polyisobutylene by polymerizing isobutylene in a polymerization zone which is at from 0 DEG to -130 DEG C., by means of from 0.01 to 1.0 percent by weight of boron trifluoride catalyst, in the presence of a primary or secondary alcohol as polymerization accelerator and in the presence of from 30 to 90% by weight of a low-boiling solvent which is inert under the reaction conditions, wherein the solvent vaporized during the polymerization is continuously drawn off, liquefied and recycled, in the liquid state, to the polymerization zone, and wherein the boron trifluoride catalyst used contains less than 0.3, in particular less than 0.01, percent by volume of silicon tetrafluoride and the solvent, which is preferably ethylene, is recycled not less than twice but not more than 36 times during the continuous polymerization.

    Continuous mixing of materials of widely differing viscosity - using screw extruders of special design
    8.
    发明专利
    Continuous mixing of materials of widely differing viscosity - using screw extruders of special design 未知

    公开(公告)号：DE2551352A1

    公开(公告)日：1977-05-26

    申请号：DE2551352

    申请日：1975-11-15

    Applicant: BASF AG

    Inventor： ZETTLER HANS DIETER ,  ENGLER PETER DIPL ING DR ,  GRUHN HEINZ ING GRAD ,  IMMEL WOLFGANG DIPL ING DR ,  SCHMITT WERNER

    IPC: B29C48/395 ,  B29B1/10

    Abstract: Continuous prodn. of homogeneous mixts. of (A) a low viscosity component of 1-1000 Ns/m2 viscosity and (B) a high viscosity component with viscosity 102-104 Ns/m2 higher than (A), with (A) being 70-99 wt. % of the total by passing (B) through a screw extruder with L/D ratio 30-60 (40-50) and adding (A) in up to 4 separate stages, in amounts of 30-60, 80-130, 400-550 and 800-1200 wt. % w.r.t. initial amount of (B) at each stage. Used for prepn. of sealants, adhesives, rubber solns. multi-grade lubricating oils, etc. in which (B) is a polymer e.g. synthetic or natural rubber, polyiso-butylene, polyvinyl ether etc. and (A) is oil bitumen, polyisobutylene polyethylene wax, paraffin wax etc. Homogeneous mixts. free from undsipersed high-viscosity material are obtd. in a continuous process, without laborious multi-stage batch mixing using incremental addns. of (A).

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