Title:
ELIMINATION OF METAL AND COLOR FROM CHEMICALLY RECYCLED BISPHENOL A
Document Type and Number:
Japanese Patent JPH1095741
Kind Code:
A
Abstract:
To provide a method for eliminating metals and color from a dihydric phenol recovered from a polymer composition containing dihydric phenol unit residues in the polymer structure.
A solid dihydric phenol (pref. bisphenol A) is recovered from a polymer containing dihydric phenol unit's reactive residues in the polymer structure, by essential dry distillation of the original dihydric phenol in the presence of hypophosphorous acid at about 0.005-0.05wt.% based on the dihydric phenol.
Inventors:
NANGUNERI SRIKANTH
Application Number:
JP16936397A
Publication Date:
April 14, 1998
Filing Date:
June 26, 1997
Export Citation:
Assignee:
GEN ELECTRIC
International Classes:
C07C37/74; C07C39/16; C08G63/195; C08G64/06; C07C37/52; (IPC1-7): C07C39/16; C07C37/52; C07C37/74
Attorney, Agent or Firm:
Tokunji Ikunuma