Polyparabanic acid derivatives and process therefor

Details Polyparabanic acid derivatives and process therefor Polyparabanic acid derivatives and process therefor

1978-09-22

1980-01-01

Cockeram, H. S.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having at least one -n=c=x group as well as...

528 68, 528 69, 548147, 548216, C08G 1830, C08G 1838, C07D26304

Patent

active

041817893

ABSTRACT:
A polyparabanic acid derivative having a recurrent structural unit of the formula ##STR1## wherein X is O or S; each of R.sup.1, R.sup.2, R.sup.3 and R.sup.4, which may be the same or different, when taken separately is hydrogen or an aliphatic, aromatic or aliphatic-aromatic group; R.sup.1 and R.sup.2 when taken together complete a cycloaliphatic ring and R.sup.3 and R.sup.4 when taken together complete a cycloaliphatic ring and each of R.sup.5, R.sup.6 and R.sup.7, which may be the same or different, is an aliphatic, aromatic or aliphatic-aromatic residue of an organic isocyanate after removal of at least one isocyanate group and method of producing same by reacting a compound of the formula ##STR2## with at least one organic isocyanate having at least two isocyanate groups at a temperature of from -20.degree. to 400.degree. C.

REFERENCES:
patent: 3661861 (1972-05-01), Hunsucker
patent: 3960816 (1976-06-01), Jarisch
patent: 4028312 (1977-06-01), Ball et al.
Tsuge et al., Tetrahedron, vol. 28, No. 18, pp. 4737-4746 (Sep. 1972).

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