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...
Patent
1980-06-20
1982-08-31
Hoke, V. P.
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 48, 528 52, 528 53, 528 68, 528 73, 528 79, 528210, 528211, C08G 1818, C08G 1877, C08G 1878
Patent
active
043473482
ABSTRACT:
A heat-resistant heterocyclic polymer consisting of units of the general formula ##STR1## wherein R, R.sup.1 and X are as defined hereinbelow and
a method for producing heat-resistant heterocyclic polymers, consisting in that, at a temperature of 90.degree. to 400.degree. C., there is conducted a reaction of polyfunctional nitrile-containing compounds with polyfunctional isocyanates.
The proposed polymers are stable at temperatures from 300.degree. to 350.degree. C. Materials based thereon are capable of retaining their properties at a temperature of up to 400.degree. C. for long periods of time. The method is simple and can be effected without isolation, purification or drying the polymer, which allows combining the process of producing the polymer with that of producing a finished article.
REFERENCES:
patent: 3657186 (1972-04-01), Craven
patent: 3674749 (1972-07-01), Craven
patent: 4229560 (1980-10-01), Chernikhov et al.
Chernikhov Alexei Y.
Gefter Evgeny L.
Lysova Valentina B.
Shmagina Nina N.
Yakovlev Mikhail N.
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