C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
400/111
C08G 18/79 (2006.01) C08G 18/10 (2006.01)
Patent
CA 1130037
A PROCESS FOR THE PREPARATION OF HIGHLY STABLE LIQUID CARBODIIMIDE-CONTAINING POLYISOCYANATE COMPOSITIONS Abstract of the Invention Highly stable liquid 4,4'-diphenylmethane di- isocyanate (MDI) containing MDI-carbodiimide adducts are prepared by (a) heating MDI at a temperature of from 60°C. to 120°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°C. and 120°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.
340107
Cenker Moses
Kan Peter T.
Schaaf Robert L.
Basf Wyandotte Corporation
Robic Robic & Associes/associates
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