Patent · US Expired

Polybenzoxazole and polybenzothiazole precursors

US6153350A · kind A · utility

8Cited by

7References

16Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Recai Sezi · Simmerath, DE
Michael Keitmann · Weisendorf, DE
Gunther Schmid · Lons-le-Saunier, FR

Key dates

Filing date	Sep 25, 1998
Grant date	Nov 28, 2000
Priority date	—
Expiry date	Sep 25, 2018

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G75/32
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The polybenzoxazole and polybenzothiazole precursors of the invention have the following partial structure: ##STR1## where: A.sup.1 to A.sup.6 are--independently of one another--H, F, CH.sub.3, CF.sub.3, OCH.sub.3, OCF.sub.3, CH.sub.2 CH.sub.3, CF.sub.2 CF.sub.3, OCH.sub.2 CH.sub.3 or OCF.sub.3 CF.sub.3 ; PA1 T is O or S, and m is 1; PA1 Z is a carbocyclic or heterocyclic aromatic radical.

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