Method of coating dual protective layers

Details Method of coating dual protective layers Method of coating dual protective layers

1984-12-14

1986-05-20

Page, Thurman K.

Coating processes

Removable protective coating applied

427156, 4274071, 427409, B05D 302

Patent

active

045900973

ABSTRACT:
A solvent-resistant barrier coating is used beneath a polyurethane top coat, for example for coating aircraft. The barrier coating comprises a film-forming addition polymer comprising units of a vinyl aromatic monomer and units of a monomer containing a hydroxy alkyl group and a polyisocyanate containing at least 2 isocyanate groups per molecule. The addition polymer has a hydroxyl content in the range 0.5 to 5 percent by weight due to the presence of the hydroxy alkyl groups and preferably contains at least 30 percent by weight of the vinyl aromatic monomer. The ratio of isocyanate groups to hydroxyl groups is in the range 1:1 to 2:1. The polyurethane top coat can be removed from the substrate by a stripping solvent such as methylene chloride without removing the barrier coating.

REFERENCES:
patent: 3558564 (1971-01-01), Vasta
patent: 4150211 (1979-04-01), Muller et al.
patent: 4151152 (1979-04-01), Schmitt et al.
patent: 4289682 (1982-09-01), Peters
patent: 4289813 (1981-09-01), Blomeyer et al.

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