Lacquer polyisocyanates, process for the production thereof and

Details Lacquer polyisocyanates, process for the production thereof and Lacquer polyisocyanates, process for the production thereof and

1981-10-16

1983-01-18

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...

427 27, 528 68, 528 61, C08G 1880

Patent

active

043693016

ABSTRACT:
The present invention relates to lacquer polyisocyanates which contain about 0 to 8% free isocyanate groups, about 10 to 28% blocked isocyanate groups and about 2 to 10% of the structural units, --NH--NH--CO--O, all percentages based on the weight of the polyisocyanates, but excluding the weight of the blocking agent. Also provided is a process for preparing these polyisocyanates which comprises reacting about 10 to 30 mol % of the isocyanate groups of an organic polyisocyanate with reaction products which have (i) alcoholic hydroxyl groups and (ii) structural units of the formula, --O--CO--NH--NH--CO--O--, and/or of the formula H.sub.2 N--NH--CO--O--, with the formation of urethane groups and optionally groups corresponding to the formula, --NH--NH--CO--O--, and reacting about 50 to 90 mol % of the isocyanate groups of the organic polyisocyanate with a blocking agent. The reaction products containing alcoholic hydroxyl groups are obtained by reacting 1 mol of hydrazine or of hydrazine hydrate with about 1 to 2 mols of a cyclic carbonate. A final object of the present invention is the use of the new lacquer polyisocyanates as the isocyanate component in thermosetting, two-component polyurethane lacquers.

REFERENCES:
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patent: 4055550 (1977-10-01), Panandiker et al.
patent: 4101473 (1978-07-01), Lander
patent: 4150211 (1979-04-01), Mueller et al.
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patent: 4212962 (1980-07-01), Schmitt et al.
patent: 4246380 (1981-01-01), Gras et al.
patent: 4252923 (1981-02-01), Konig et al.
patent: 4310646 (1982-01-01), Kempter et al.

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