Process for preparing alicyclic isocyanates

Details Process for preparing alicyclic isocyanates Process for preparing alicyclic isocyanates

1980-07-21

1981-11-10

Bond, Robert T.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

26032645, 546243, C07D22310, C07D21176, C07D20726

Patent

active

042997666

ABSTRACT:
Lactam-blocked products of alicyclic isocyanates are obtained by blocking an aromatic isocyanate with lactam and subjecting the resulting blocked product to catalytic hydrogenation with use of a Rh catalyst.
The blocked alicyclic isocyanate obtained thus can be used, for example, as a curing agent for synthetic resins such as epoxy resins or as a starting material of urethane coatings.
The blocked isocyanate, if desired, may be subject to distillation whereby an alicyclic isocyanate is isolated by thermal dissociation and separation of the blocking agent.

REFERENCES:
patent: 2698845 (1955-01-01), Mastin et al.
patent: 2822373 (1958-02-01), Beck
patent: 3483189 (1969-12-01), Brotherton et al.
patent: 3591635 (1971-07-01), Farrissey et al.
patent: 3856862 (1974-12-01), Chung et al.
patent: 3987033 (1976-10-01), Ojakaar
patent: 4171305 (1979-10-01), Mochizuki
patent: 4191833 (1980-03-01), Tucker
patent: 4211699 (1980-07-01), Winkelmann et al.
Malz and Greenfield, "Industrial, Eng. Chem. Process. Res. Dev.", vol. 17, No. 4, (1978) p. 358.
Noller, "Chemistry of Organic Compounds", Second Edition (1957) (Saunders) pp. 479, 799 and 800.

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