Patent · US Expired

Base-soluble polyimide release layers for use in microlithographic processing

US5281690A · kind A · utility

54Cited by
3References
21Claims
0Family size

Assignee

Inventors

Key dates

Filing dateMar 30, 1989
Grant dateJan 25, 1994
Priority date
Expiry dateMar 30, 2009

Classification

  • Technology area (CPC C)Chemistry; Metallurgy
  • CPC primaryC08L63/00
  • WIPO fieldMacromolecular chemistry, polymers
  • WIPO sectorChemistry

Abstract

Base-soluble release layer compositions for microlithographic processing, comprising nonamic acid functionalized polyamic acid/imide resins are disclosed. These materials permit concurrent lithographic development of photoresist and release layers. They also afford effective lift-off, by alkaline media, even after high imidization.

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