Flame-resistant substrate for flexible circuit boards

US5498471A · kind A · utility

Assignee

• Firma Carl Freudenberg · DE

Inventors

• Jorg Hausdorf · Fürth, DE
• Thomas Kuhlmann · Jena, DE
• Rolf Schneider · Burgstetten, DE
• Steffen Kosack · Haßloch, DE
• Werner Schafer · Essen, DE
• Volker Siekermann · Fürth, DE

Key dates

• Filing date: Jun 6, 1995
• Grant date: Mar 12, 1996
• Expiry date: Jun 6, 2015

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T442/268
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

A thermostable substrate for flexible circuit boards having excellent flame-resistance, handling, and storage qualities may be produced by treating a substrate of a nonwoven fabric or paper with a flame-resistant, halogen-free polymeric composition. The polymeric composition comprises an aqueous mixture of a copolymerizate of acrylic acid esters and styrene, and an aminoplastic or phenoplastic precondensate to which a mixture of fine-particle red phosphorus and fine-particle ammonium polyphosphate is also added.