Diblocked diisocyanate diurea oligomers and coating compositions

Details Diblocked diisocyanate diurea oligomers and coating compositions Diblocked diisocyanate diurea oligomers and coating compositions

1983-04-11

1984-04-10

Lieberman, Paul

Coating processes

With post-treatment of coating or coating material

Heating or drying

523400, 523454, 525454, 525578, 528 45, 427 141, C08G 1832, C08G 1858, C08G 1880, C08L 6300

Patent

active

044421460

ABSTRACT:
This invention provides novel resin systems and high solids, solvent-based chain-extendable, self-crosslinking coating compositions comprising same. The resin system comprises novel diblocked diisocyanate diurea oligomers of number average molecular weight about 300 to 5000. The resin system further comprises a polyepoxide, preferably a diepoxide, of molecular weight about 100 to 1000 used generally with said oligomer in weight ratio of about 1:1 to about 1:10, respectively. The resin components provide chain-extension polymerization during cure at elevated temperature, in situ, on the surface of a substrate. The resin system is also self-crosslinking. That is, no additional crosslinking component is required to cure the composition. The cured coatings of the invention provide greatly improved physical properties, in particular, greatly improved corrosion resistance.

REFERENCES:
patent: 3933759 (1976-01-01), Hoeschele
patent: 4089844 (1978-05-01), Tsoa
patent: 4134865 (1979-01-01), Tominaga
patent: 4284572 (1981-08-01), Stanley
patent: 4294940 (1981-10-01), Hino
patent: 4315840 (1982-02-01), Hempter
patent: 4383091 (1983-05-01), Burton

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