Process for the preparation of highly stable liquid carbodiimide

Details Process for the preparation of highly stable liquid carbodiimide Process for the preparation of highly stable liquid carbodiimide

1978-11-20

1979-12-04

Torrence, Dolph H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260453SP, 560 26, 521901, C07C119055

Patent

active

041772059

ABSTRACT:
Highly stable liquid 4,4'-diphenylmethane diisocyanate (MDI) containing MDI-carbodiimide adducts are prepared by (a) heating MDI at a temperature of from 60.degree. C. to 120.degree. C. for a period of from one hour to ten hours in the presence of tris(chloromethyl)phosphine oxide, (b) stopping the carbodiimide formation by adding thereto a quenchant selected from the group consisting of magnesium chloride hydrate, stannous chloride and trichlorosilane, (c) heating the reaction mixture at a temperature between 60.degree. C. and 120.degree. C. for a period of from 0.5 hour to 6.0 hours, and (d) cooling to room temperature. The resulting compositions are highly stable and may be advantageously employed in the preparation of polyurethane compositions.

REFERENCES:
patent: 3761502 (1973-09-01), Kan et al.

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