Verfahren zur Herstellung von Polyaminen für helleren auf Polyisocyanat basierenden Schaum
摘要
The present invention encompasses an improved process for preparing polymethylene polyphenyl polyisocyanate comprising reacting phosgene with polymethylene polyphenyl polyamine, the improvement wherein the polymethylene polyphenyl polyamine is acidified prior to phosgenation.
申请公布号
DE69213678(D1)
申请公布日期
1996.10.17
申请号
DE1992613678
申请日期
1992.11.27
申请人
BAYER CORP., PITTSBURGH, PA., US
发明人
BOLTON, JEFFREY S., WHEELING, WV 26003, US;KALYANARAMAN, RAMON, WHEELING, WV 26003, US;SCHILLING, STEVEN L., GLEN DALE, WV 26038, US;BLUE, CLARENCE D., W-4047 DORMAGEN 1, DE
