Method for preparing biuret-structure polyisocyanates

Details Method for preparing biuret-structure polyisocyanates Method for preparing biuret-structure polyisocyanates

1979-05-09

1980-08-19

Torrence, Dolph H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C12724

Patent

active

042183901

ABSTRACT:
A method for preparing biuret-structure polyisocyanates which comprises reacting 1,6-hexamethylenediisocyanate with water which is introduced into the reaction zone in the form of vapors in a mixture with air or an inert gas at a moisture content of said mixture of from 0.1 to 2.0 kg/kg and temperature of from 110.degree. to 130.degree. C. The reaction is carried out at a temperature ranging from 150.degree. to 170.degree. C.
The polyisocyanates having biuret structure as produced by the method according to the present invention have a molecular mass of about 800, the content of isocyanate groups is as high as 23.59%. No polyurea is formed in the reaction. The process is single-staged, technologically simple and can be performed continuously.

REFERENCES:
patent: 3896154 (1975-07-01), Takahashi et al.
patent: 3903127 (1975-09-01), Wagner et al.

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