Storage stable aq. poly:isocyanate emulsions prepn. - using polyglycol or polyvinyl alcohol based emulsifier, used in wood chip panels mfr.

摘要

Prepn. of aq. polyisocyanate emulsions involves dispersing or emulsifying the polyisocyanates in water in the presence of an emulsifier based on a polyglycol of molecular wt. 4,000-20,000, or a polyvinyl alcohol of molecular wt. 5,000-100,000. The polyisocyanate is pref. the phosgenated reaction product of aniline and formaldehyde. The emulsion can also be prepd. in the additional presence of a polypeptide. The emulsions are used for the glueing together of wood chip panels.