Process for the production of modified polyisocyanates, the poly

Details Process for the production of modified polyisocyanates, the poly Process for the production of modified polyisocyanates, the poly

1989-04-26

1990-06-19

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...

528 60, 528 65, 528 66, 528 76, 528 83, 528 85, C08G 1870

Patent

active

049354868

ABSTRACT:
The present invention is directed to a process for the production of urethane- or isocyanurate-modified polyisocyanates based on a starting diisocyanate selected from (i) 2,4-diisocyanatotoluene or mixtures thereof with up to about 35%, based on the mixture, of 2,6-diisocyanatotoluene, (ii) mixtures of the diisocyanates mentioned under (i) with up to 80 NCO equivalent %, based on the mixture, of 1,6-diisocyanatohexane and (iii) 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethyl cyclohexane by reacting the starting diisocyanate with substoichiometric quantities of polyhydric alcohols or trimerizing a portion of the isocyanate groups of the starting diisocyanate, removing sufficient excess, unreacted starting diisocyanate to obtain modified polyisocyanates containing at most 3% by weight, based on solids, of monomeric starting diisocyanate, characterized in that, the content of starting diisocyanate is further reduced by adding at least 10 mol-% water, based on the content of unreacted 2,4-diisocyanatotoluene or 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethyl cyclohexane present, to the modified polyisocyanates.
The present invention is also directed to the low-monomer polyisocyanates obtained by this process and their use as the binder component in one-component or two-component polyurethane lacquers.

REFERENCES:
patent: 3023228 (1962-02-01), Wagner et al.
patent: 3183112 (1965-05-01), Gemassmer
patent: 3394111 (1968-07-01), Liebsch
patent: 3428611 (1969-02-01), Brotherton et al.
patent: 3992316 (1976-11-01), Pedain et al.
Chemical Abstracts, Band 94, Nr, 11, Jun. 1981.

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