Strippable, thin, protective coating

Details Strippable, thin, protective coating Strippable, thin, protective coating

1973-04-05

1976-04-06

Welsh, M. J.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 775AM, 260 775CR, 260 775AT, 260 775SS, C08G 1832

Patent

active

039488292

ABSTRACT:
A coherent, adherent, thin coating for metal surfaces is disclosed. The coating comprises a polymeric composition of a high vinyl content, liquid, hydroxy-terminated butadiene prepolymer, chain extended and cured by polyisocyanates and polyamines. The coating is sprayed onto an aluminum surface and after evaporation of solvent and curing for a short period at elevated temperature exhibits an adhesion to aluminum of between 0.2 lb/in to 2 lb/in, an elongation of 75% to 150%, and a tensile strength from 1,000 to 4,000 psi. The coating is strippable when applied at 2-5 mil thickness onto aluminum, and protects the metal surface during etching in chromic acid, during high temperature bonding and during final assembly operations. The coated surfaces can be machined, riveted, drilled and stretch formed without any lifting or tearing of the coating.

REFERENCES:
patent: 3042631 (1962-07-01), Strandskov
patent: 3404130 (1968-10-01), Sigura et al.
patent: 3427366 (1969-02-01), Verdol et al.
patent: 3431235 (1969-03-01), Lubowitz
patent: 3549569 (1970-12-01), Farah et al.
patent: 3632844 (1972-01-01), Robins

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