Preparation of highly functional aromatic polyisocyanates

Details Preparation of highly functional aromatic polyisocyanates Preparation of highly functional aromatic polyisocyanates

C - Chemistry, Metallurgy

08

G

C08G 18/76 (2006.01) C08G 18/06 (2006.01) C08G 18/16 (2006.01) C08G 18/40 (2006.01) C08G 18/78 (2006.01)

Patent

CA 2366154

Highly functional aromatic polyisocyanates are prepared by reacting aromatic polyisocyanates, if required as a mixture with further mono- and/or polyisocyanates, with addition of catalytic acidic substances and water, by a process wherein the aromatic polyisocyanates used comprise at least one tolylene diisocyanate and the catalytic acidic substance used is at least one alkyl and/or aralkyl phosphate, and the process is carried out in such a way that the water is added with a temperature/time gradient increase from 5 to 60°/hour and until an isocyanate modification of the starting NCO terminal groups from 1 to 80% is established. The highly functional aromatic polyisocyanates prepared by this process are used for the preparation of polyurethane foams, in particular flexible polyurethane foams.

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