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AssigneeAkzo N.V.
InventorsHans-Georg Zengel, Michael Wallrabenstein, Walter Brodowski
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Mixtures hardenable under the influence of air moisture are provided. They comprise at least one organic polyisocyanate or an polyepoxide and as a moisture activated hardener an N,N'-substituted imidazolidine derivative or an N,N'-substituted hexahydropyrimidine derivative, which show at no nitrogen atom a --CO--NH-- grouping and which are present in sufficient amount to provide for cross-linking. The mixtures for example provide lacquers and adhesives having various touch dry times.
A polymeric mixture hardenable in the presence of moisture comprising
Method for preparing a mixture capable of hardening with moisture comprising
Method for preparing polyisocyanate polyaddition products or cross-linked polyepoxides in the presence of water comprising reacting organic polyisocyanates or polyepoxides with N,N'-substituted imidazolidine derivatives or with N,N'-substituted hexahydropyrimidine derivatives having at no nitrogen atom a --CO--NH-- grouping, under the hydrolyzing influence of water.
Dependencies are inferred from the claim text.
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No related US applications are recorded in the indexed filing history.
Containing only nitrogen as a heteroatom: having two nitrogen atoms in the ring
Being in latent form: reaction products of polyamines with aldehydes or ketones
Macromolecular compounds not provided for by groups C08G18/42 - C08G18/63: having nitrogen
Amines: amino carboxylic acids
Term ended 22 May 2000 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
The invention relates to a mixture hardening under the influence of air moisture and to a process for production of polyisocyanate-polyaddition products or cross-linked polyepoxides.
According to German Offenlegungsschrift DE-OS No. 2 018 233 preparations are known which comprise an oxazolidine and a polyfunctional isocyanate and which harden in the presence of water to provide tough, chemically resistant polymeric materials.
In the German Offenlegungsschrift DE-OS No. 2 718 100 a process is described for preparing polyisocyanatepolyaddition products by reacting of organic polyisocyanates with compounds which split off organic diamines under the influence of water. Herein polycyclic condensation products of formaldehyde with aliphatic or cycloaliphatic diprimary 1,2-diamines are employed as compounds splitting off organic diamines.
Of course, the mixtures in accordance with the invention can comprise the usually employed auxiliary materials and additives. As such can be considered for example pigments, antisettling materials, leveling agents and fillers such as barium sulfate, chalk powder, talcum.
In a two necked flask provided with stirrer, head for water separation with reflux condenser and dry tube 400 ml benzene, 83 g (0.94 mole) N,N'-dimethylethylenediamine and 92.4 g (0.94 mole) cyclohexanone are filled in. The reaction mixture is heated under reflux and the water distills off as an azeotrope and is collected in the water separator after separation from benzene and is drained off. The water separation was finished after three hours. The benzene was distilled off from the flask and then the reaction product was obtained pure by twice fractional distilling in vacuum. Boiling point: 333.degree. K./399 Pa. The yield of 2-pentamethylene-N,N'-dimethylimidazolidine-1,3 was about 50%.
Elementary analysis calculated for ClO H 20 N 2: C 71.5; H 11.9; N 16.6. C 70.4; H12.0; N 17.0.