Flame-resistant cover film for flexible circuit boards

Details Flame-resistant cover film for flexible circuit boards Flame-resistant cover film for flexible circuit boards

1991-08-21

1993-07-20

Ryan, Patrick J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

428901, 361398, 430286, 174250, B32B 900

Patent

active

052291928

ABSTRACT:
A flame-resistant cover film for flexible circuit boards having excellent flame-resistance, handling, and storage qualities may be produced by treating an insulating film of a nonwoven polymer fabric with a flame-resistant, halogen-free polymeric adhesive. The polymeric adhesive 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.

REFERENCES:
patent: 4075420 (1978-02-01), Walton
patent: 4195997 (1980-04-01), Graham
patent: 4311749 (1982-01-01), Hiraiwa et al.
patent: 4314002 (1982-02-01), Oizumi et al.

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