Process for the production of polyisocyanates

Details Process for the production of polyisocyanates Process for the production of polyisocyanates

C - Chemistry, Metallurgy

07

C

260/455

C07C 71/00 (2006.01)

Patent

CA 1234826

Mo-2653 LeA 22,994 PROCESS FOR THE PRODUCTION OF POLYISOCYANATES ABSTRACT OF THE DISCLOSURE Polyisocyanates are produced by reacting a polyamine solution with a phosgene solution. After the product polyisocyanate has been recovered, the solvent or a portion of the solvent employed is treated with crosslinked polymers insoluble in the solvent which polymers contain primary and/or secondary alcoholic hydroxyl groups and/or primary and/or secondary amino groups. After treatment, the polymer and any reaction products are removed. The solvent may then be reused. Preferred solvents are chlorobenzene and o-dichloro- benzene. The preferred polymers are bead polymers or bead copolmers of (meth)acrylic acid or styrene/divinyl benzene copolymer. Mo-2653

476992

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