Patent · US Expired

Preparation of poly-o-hydroxyamides and poly o-mercaptoamides

US5973202A · kind A · utility

10Cited by

9References

10Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Recai Sezi · Simmerath, DE
Hellmut Ahne · Königsee, DE
Eva Rissel · Forchheim, DE
Kurt Geibel · Prüm, DE

Key dates

Filing date	Aug 28, 1996
Grant date	Oct 26, 1999
Priority date	—
Expiry date	Aug 28, 2016

Classification

Technology area (CPC G)Physics
CPC primaryG03F7/0387
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

In a process for the preparation of poly-o-hydroxyamides and poly-o-mercaptoamides, a bis-o-aminophenol or a bis-o-aminothiophenol is reacted with a dicarboxylic acid derivative of the following structure: ##STR1## with D=O, S, or NH and where R* is the parent body of the dicarboxylic acid and at least one of the groups R.sup.1 and R.sup.2 is CN or NO.sub.2.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.