Process for the preparation of polyhydantoins and polyparanic ac

Details Process for the preparation of polyhydantoins and polyparanic ac Process for the preparation of polyhydantoins and polyparanic ac

1975-01-30

1977-01-25

Welsh, M. J.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C08G 1800

Patent

active

040050564

ABSTRACT:
Process for the preparation of polyhydantoins or polyparabanic acids, characterized in that bis- or polyglycine derivatives or bis- or poly-monoamidooxalic acid derivatives are heated to temperatures of 20.degree. to 250.degree. C with di- or polyiso(thio)cyanate derivatives without solvents and the highly fluid melt which has a melt viscosity of at the most 40,000 m.Pa.s. is optionally subjected to a shaping process and is polycondensed by adjustment to the reaction of 80.degree. to 700.degree. C.

REFERENCES:
patent: 3397253 (1968-08-01), Merten et al.
patent: 3448170 (1969-06-01), Merten et al.

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