Process for the production of polyurea-elastomers and correspond

Details Process for the production of polyurea-elastomers and correspond Process for the production of polyurea-elastomers and correspond

1985-01-24

1986-02-11

Cockeram, Herbert 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 44, 528 64, 528 67, 528 68, C08G 1879, C08G 1832

Patent

active

045699828

ABSTRACT:
According to the present invention, relatively high molecular weight aliphatic and/or aromatic polyamines having molecular weights of from 400 to 8,000 (preferably from 600 to 4,000) are mixed with substantially equivalent quantities of low molecular weight, solid, finely-divided diisocyanates having a melting point of >40.degree. C., (preferably >80.degree. C.), such as phenylene diisocyanate, naphth lene-1,5-diisocyanate, dimeric toluylene-2,4-diisocyanate or the urea diisocyanate of toluylene-2,4-diisocyanate. This mixture, having a pot life of at least several minutes, is subsequently heated to a relatively high temperature, such as from 80.degree. to 200.degree. C.
The products obtained have excellent elastic properties over a broad temperature range. They have an exceptionally flat modulus of elasticity curve (G') in the torsional vibration test. The hard and soft segments are markedly segregated and are thus not substantially disturbed by reciprocal interaction causing "softening".

REFERENCES:
patent: 4336365 (1982-06-01), Reischl et al.
patent: 4400497 (1983-08-01), Blum et al.
patent: 4418160 (1983-11-01), Rasshofer et al.
patent: 4442280 (1984-04-01), Grogler et al.

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