Compounds with isocyanate groups and masked groups reactive in r

Details Compounds with isocyanate groups and masked groups reactive in r Compounds with isocyanate groups and masked groups reactive in r

1998-06-18

2000-02-08

Gorr, Rachel

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...

2521822, 25218221, 25218222, 540544, 540553, 540609, 544 63, 544335, 549 10, 549 11, 549 22, 549 30, 549 39, 549 76, 549 77, 549 78, 549 79, 549373, 549375, 549493, 549510, C08G 1828

Patent

active

060229381

DESCRIPTION:

BRIEF SUMMARY
The invention relates to isocyanato compounds (compounds containing isocyanate groups) with capped, isocyanate-reactive groups, of the general formula I ##STR9## where R.sup.1 and R.sup.2 are hydrogen, C.sub.1 -C.sub.10 -alkyl, C.sub.6 -C.sub.10 -aryl or C.sub.7 -C.sub.10 -aralkyl or together form C.sub.3 -C.sub.10 -alkanediyl, ##STR10## where R.sup.4 is hydrogen, C.sub.1 -C.sub.20 -alkyl which is uninterrupted or interrupted by oxygen atoms in ether function, or is C.sub.6 -C.sub.10 -aryl or C.sub.7 -C.sub.10 -aralkyl, R.sup.2 --Y-- forms a 4-7-membered ring, ##STR11## is replaced by an allophanate group R.sup.Ia ##STR12## in which R.sup.5 is a divalent aliphatic, alicyclic, araliphatic or aromatic C.sub.2 -C.sub.20 hydrocarbon unit, aromatic C.sub.1 -C.sub.20 hydrocarbon unit or a mono- or poly(C.sub.2 -C.sub.4 -alkylene oxide) unit, and ##STR13## or a biuret group R.sup.Ib ##STR14## in which one R.sup.8 is hydrogen and the other is as defined for R.sup.7 or a biuret group R.sup.Ic ##STR15## in which one R.sup.9 is as defined for R.sup.7 and the other is as defined for R.sup.1 ##STR16##
The invention additionally relates to crosslinking polyurethane coating compositions comprising compounds of the formula I and to coating methods in which these crosslinking polyurethane coating compositions are used.
Crosslinking polyurethane coating compositions are generally known, for example in the form of 2-component materials (cf. Kunststoff Handbuch, Volume 7, Polyurethane, 2nd Edition, 1983, Carl Hanser Verlag Munich, Vienna, pp. 540-561). These two-component systems contain a polyol as binder and a compound having two or more free isocyanate groups as crosslinking component.
Since a high molecular weight network develops after the two components are mixed, they can only be mixed directly prior to application to the workpiece to be coated. For the processer of such systems this means that the individual coating steps must follow on smoothly from one another in terms of time, since following the mixing of the components a defined quantity of coating material must be processed within a certain time.
This complication in the processing of these systems is accepted by the processer, since the resulting coatings are markedly superior to those obtained from the generally known, noncrosslinking one-component systems, which can in principle be stored for as long as is desired.
This superiority relates in particular to service properties such as impact or abrasion chemicals radiation
In order for coating materials to be able to be applied without problems by conventional techniques, for example by spray application to the surface to be coated, they should be of limited viscosity. Consequently, coating materials based on two-component systems usually include solvents. However, the solvent content of these materials causes problems, since the coatings processer has to take technically complex measures in order to avoid the passage into the atmosphere of the solvents released during application and drying of the coating materials. Consequently, many attempts have been made to find a way out of this situation of conflicting aims and to provide two-component systems which are not only of low viscosity coupled with high solids content but which also have a high profile in terms of the abovementioned service properties.
EP-A-0 585 835 describes two-component systems where the isocyanate component comprises trimerized diisocyanates containing isocyanurate groups, where some of the remaining isocyanate groups are reacted with a monohydric alcohol to form urethane groups.
Polyisocyanates containing isocyanurate groups and allophanate groups, and formed from a diisocyanate and a polyester monoalcohol, are described in DE-A-O 15 155. These polyisocyanates can be used as hardeners in two-component polyurethane coatings.
Additionally, in order to reduce the viscosity of the two-component systems, reactive diluents have been developed. These compounds have a similar effect on the viscosity of two-component systems to that of a solvent.

REFERENCES:
patent: 4002601 (1977-01-01), Hajels

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