Patent · US Expired

Method for the preparation of thin polyimide film

US4590103A · kind A · utility

12Cited by

6References

3Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Hellmut Ahne · Königsee, DE
Wolfgang Kleeberg
Roland Rubner · Königsee, DE
Hans Kruger · Birkenfeld, DE

Key dates

Filing date	Jun 20, 1984
Grant date	May 20, 1986
Priority date	—
Expiry date	Jun 20, 2004

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G73/1003
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The invention relates to a method for the preparation of thin polyimide layers by applying a solution of a polyimide prepolymer to a substrate, and subsequently annealing, and has as its object the provision of a method of this type in such a way that the preparation of layers with layer thicknesses of .ltoreq.0.2 .mu.m is made possible which layers have a homogeneous character and exhibit good adhesion. For this purpose, the invention provides that film-forming prepolymers of highly heat-resistant polyimides are used which prepolymers give off a high percentage of volatile products in annealing. The method according to the invention is particularly suitable for the production of orientation layers for liquid-crystal displays.

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