Metal treatment – Compositions – Heat treating
Patent
1977-06-20
1978-07-04
Hoffman, James R.
Metal treatment
Compositions
Heat treating
148 315, 427380, B05D 138, B05D 302, B05D 714, B32B 1508
Patent
active
040986209
ABSTRACT:
Composite coatings, established on metal substrates, now exhibit enhanced film integrity, such as when exposed to chemicals, solvents and salt. Additional desirable coating characteristics are also maintained. The undercoating of the composite contains a hexavalent-chromium-providing substance. Included in the topcoating applied over the uncured undercoating is a hydroxyl-containing resin and isocyanate adduct. Subsequent heating fully develops the undercoat curing while concomitantly curing the topcoating.
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patent: 3437531 (1969-04-01), Svadlenak
patent: 3519501 (1970-07-01), Holden et al.
patent: 3535166 (1970-10-01), Hamilton
patent: 3535167 (1970-10-01), DE Ridder et al.
patent: 3671331 (1972-06-01), Malkin et al.
patent: 3679493 (1972-07-01), Beiswanger et al.
patent: 3687739 (1972-08-01), Kennedy et al.
patent: 4020220 (1977-04-01), Germano
Diamond Shamrock Corporation
Freer John J.
Hoffman James R.
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