Process for the production of bisulphite addition products...

Details Process for the production of bisulphite addition products... Process for the production of bisulphite addition products...

C - Chemistry, Metallurgy

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C08G 18/08 (2006.01) C08G 18/10 (2006.01) C08G 18/48 (2006.01) D06M 13/395 (2006.01) D06M 15/564 (2006.01)

Patent

CA 1079744

A PROCESS FOR THE PRODUCTION OF BISULPHITE ADDITION PRODUCTS OF POLYISOCYANATE PREPOLYMERS IN WATER ABSTRACT OF THE DISCLOSURE The instant invention relates to a new process for the production of bisulphite addition compounds of poly- isocyanate prepolymers containing free isocyanate groups which is carried out in the absence of organic solvents. In general, the process is characterized by reacting the polyisocyanate prepolymers with water-soluble bisulphites, wherein, a) The polyisocyanate prepolymers used are isocyanate group containing reaction products of low molecular weight organic polyisocyanates with deficits of organic polyhydroxyl compounds which have been modified by the incorporation of non-ionic hydrophilic groups in such a way that the polyisocyanate prepolymers can be emulsified in water, and b) the reaction with bisulphites is carried out in the aqueous phase in the absence of organic solvents.

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