Process for the production of polyisocyanates

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

1985-03-25

1988-05-17

Siegel, Alan

Organic compounds -- part of the class 532-570 series

Organic compounds

Isocyanate esters

560352, C07C 7100

Patent

active

047452161

ABSTRACT:
Polyisocyanates are produced by reacting a polyamide 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-dichlorobenzene. The preferred polymers are bead polymers or bead copolymers of (meth)acrylic acid or styrene/divinyl benzene copolymer.

REFERENCES:
patent: 4405527 (1983-09-01), Wegener et al.
patent: 4507464 (1985-03-01), Rasshofer et al.
Ullmanns Encyclopadie der Technischen Chemie, 4th Edition 1977, vol. 13, pp. 347 et seq.
Ullmanns Encyclopadie der Technischen Chemie, "Hormone bis Keramik", 4.
Auflage, Band 13, Verlag Chemie, Weinheim, N.Y., Seite 312 et seq.
Ullmanns Encyclopadie der Technischen Chemie, Band 13, Verlag Chemie, Weinheim, N.Y., Seite 295-299.

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