Method of bonding polytetrafluoro-ethylene composition to metal

Adhesive bonding and miscellaneous chemical manufacture – Delaminating processes adapted for specified product – Delaminating in preparation for post processing recycling step

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Details

156645, 156668, 1563071, 1563086, 428421, B44C 122, B29C 3700, B32B 3100

Patent

active

046700897

ABSTRACT:
A method of bonding a fluoroplastic material to a preselected surface of a metal substrate is disclosed. The method comprises: providing a flexible film, tape or sheet comprised of a fluoroplastic material which expands when heated; etching one side of the fluoroplastic film, tape or sheet; providing a flexible adhesive laminate having a surface layer comprised of a thermosetting adhesive film adhered to a non-adhesive and removable backing; treating the surface layer with a solvent to render it tacky; joining the tacky surface to the etched surface of the fluoroplastic film under pressure to form a laminate; cutting a shape from the laminate which replicates the shape of the preselected surface of the metal substrate; removing the non-adhesive backing from the laminate shape to expose the thermosetting adhesive film layer; covering the preselected surface of the metal substrate with the exposed adhesive film layer of the laminate; restraining the laminate from lateral expansion while heating the laminate to a temperature which thermosets the adhesive film and expands the fluoroplastic, for a time period sufficient to bond the fluoroplastic material to the preselected surface of the metal substrate.

REFERENCES:
patent: 3067078 (1962-12-01), Gluck
patent: 3411965 (1968-11-01), Hobaica
patent: 4465547 (1984-08-01), Belke et al.

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