Thermally stable, irradiation cross-linkable polymer systems based on bisphenols and epichlorohydrin

US4735891A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Klaus Budde · Unterhaching, DE
• Oskar Nuyken · Munich, DE

Key dates

• Filing date: Jun 27, 1985
• Grant date: Apr 5, 1988
• Expiry date: Jun 27, 2005

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S525/922
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

For shortening the exposure time of radiation-sensitive epoxy resin lacquers based on condensates of bisphenols and epichlorohydrin and for increasing their thermal stability, the number of reactive groups in each polymer repeating unit is increased by incorporating there into at least two hydroxyl groups and preferably five hydroxymethylene groups. When a composition of such a polyhydroxylated condensate is reacted with cinnamic acid chloride or the like, the resulting light sensitive condensate is utilizable as a coating in the manufacture of printed multilayer wirings. Intermediate tempering, drilling and additional protective films are eliminated. Such a condensate can also be employed in the field of integrated semiconductor circuits in VLSI technology where lacquer structures are produced.