Modified polyisocyanates with biuret structure and process for t

Details Modified polyisocyanates with biuret structure and process for t Modified polyisocyanates with biuret structure and process for t

1987-12-16

1989-06-20

Siegel, Alan

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

Organic compounds

Carboxylic acid esters

560159, C07C12506

Patent

active

048410950

ABSTRACT:
Modified polyisocyanates with biuret structure containing terminal urethane groups and having general formula: ##STR1## in which R.sub.1 is an aliphatic, cycloaliphatic or aliphatic-cycloaliphatic radical, simple or substituted, and R.sub.2 can have the same meanings as R.sub.1 or can be the radical R.sub.3 (OC.sub.n H.sub.2n).sub.x --.
Process for the preparation of modified polyisocyanates having biuret structure containing terminal urethane groups having general formula (I) consisting in reacting an organic diisocyanate with water or with a compound which splits off water, in the presence of a compatibilizing agent having a hydrogen atom reactive towards the isocyanate group, as it can be determined by Zerewitinoff's method.

REFERENCES:
patent: 4028392 (1977-06-01), Ogawa et al.
patent: 4386032 (1983-05-01), Hughes et al.
patent: 4419293 (1983-12-01), Hudson

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