Continuous process for the production of partially blocked isocy

Details Continuous process for the production of partially blocked isocy Continuous process for the production of partially blocked isocy

1976-12-08

1977-10-25

Rzucidlo, Eugene C.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 775AT, 260 775TB, C08G 1802

Patent

active

040555500

ABSTRACT:
A method for manufacturing partially blocked isocyanate curing agents in which a polyisocyanate and a blocking agent for the polyisocyanate are separately and continuously metered into a reaction zone in predetermined nonstoichiometric proportion under reaction conditions, and in which the reaction mixture is continuously withdrawn from the reaction zone to provide a partially blocked isocyanate curing agent product. The partially blocked isocyanate curing agent product may be continuously reacted with a polyhydroxy resin coating precursor at a temperature below the unblocking temperature of the blocking agent in respect of the polyisocyanate to provide a heat curable powder coating composition.

REFERENCES:
patent: 3393177 (1968-07-01), Guest et al.
patent: 3718622 (1973-02-01), Camilleri et al.
patent: 3846378 (1974-11-01), Griswold

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