Title:
METHOD FOR REDUCING PORTION OF OLIGOCONDENSATE IN POLYCONDENSATE
Document Type and Number:
Japanese Patent JPH0867755
Kind Code:
A
Abstract:
To reduce a portion of an oligocondensate in a polycondensate.
A polycondensate is dissolved in a solvent (A), and the formed solution is thoroughly mixed once or several times with 0.001-1 pt.wt., per 100 pts.wt. solvent (B), concentrated-acid (C)-containing another solvent or solvent mixture (B) in which the polycondensate is slightly soluble or insoluble and which has a density lower than that of the component A and is used in an amount to give a ratio of component A to component B of 2:1 to 20:1. The mixture is then separated into two phases, the high-density solvent phase is separated, washed with water, and the polycondensate is isolated from the high-density phase.
Inventors:
GERUHARUTO FUENHOFU
ROTAA BUNTSUERU
RARUFU PAKURU
BIRUFURIITO HEEZE
ROTAA BUNTSUERU
RARUFU PAKURU
BIRUFURIITO HEEZE
Application Number:
JP22864495A
Publication Date:
March 12, 1996
Filing Date:
August 15, 1995
Export Citation:
Assignee:
BAYER AG
International Classes:
C08G63/00; C08G63/90; C08G64/40; C08G85/00; (IPC1-7): C08G85/00; C08G63/90; C08G64/40
Attorney, Agent or Firm:
Heiyoshi Odashima