Process for the production of diisocyanato toluene mixtures havi

Details Process for the production of diisocyanato toluene mixtures havi Process for the production of diisocyanato toluene mixtures havi

1980-08-06

1981-10-06

Welsh, Maurice J.

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...

252182, 260453SP, 544193, C08G 1876

Patent

active

042936802

ABSTRACT:
The instant invention is directed to a process for the production of diisocyanate mixtures of 2,4-diisocyanato toluene and 2,6-diisocyanato toluene, having from 36 to 90% by weight, based on the total mixture, of 2,6-diisocyanato toluene, comprising: trimerizing some of the isocyanate groups of a diisocyanate mixture of 2,4-diisocyanato toluene and 2,6-diisocyanato toluene, having a maximum content of 2,6-diisocyanato toluene of 35% by weight based on the total mixture and isolating from the reaction mixture which is thus obtained, a diisocyanate mixture having an increased content of 2,6-diisocyanato toluene.
The invention is also directed to the use of these mixtures as synthesis components in the production of polyurethane elastomers.

REFERENCES:
patent: 3022328 (1962-02-01), Cobb
patent: 3217024 (1965-11-01), Park et al.
patent: 3316285 (1967-04-01), Cleveland
patent: 3554872 (1971-01-01), Chang et al.
patent: 3620929 (1971-11-01), Kober et al.
patent: 3652424 (1972-03-01), Jackson et al.
patent: 4115373 (1978-09-01), Henes et al.

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