The present invention relates to novel blocked, elimination-free polyurethane (PUR) crosslinking agents, to a process for their preparation and to their use as starting components for the production of polyurethane plastics, especially as crosslinking agents for thermally crosslinkable powder coatin
The present invention relates to novel blocked, elimination-free polyurethane (PUR) crosslinking agents, to a process for their preparation and to their use as starting components for the production of polyurethane plastics, especially as crosslinking agents for thermally crosslinkable powder coatings.
대표청구항▼
What is claimed is: 1. Organic polyisocyanates which a) have a melting range within the temperature range of from 40째 C. to 125째 C., and b) have NCO groups blocked with one or more CH-acidic cyclic ketones of general formula (I): in which X is an electron-withdrawing group, R1, and R2 independen
What is claimed is: 1. Organic polyisocyanates which a) have a melting range within the temperature range of from 40째 C. to 125째 C., and b) have NCO groups blocked with one or more CH-acidic cyclic ketones of general formula (I): in which X is an electron-withdrawing group, R1, and R2 independently of one another are a hydrogen atom, a saturated or unsaturated aliphatic or cycloaliphatic radical or an optionally substituted aromatic or araliphatic radical, which radicals in each case contain up to 12 carbon atoms and optionally up to 3 heteroatoms selected from the elements oxygen, sulfur and nitrogen, and are optionally substituted by halogen atoms, and n is an integer from 0 to 5. 2. The polyisocyanates according to claim 1, wherein the polyisocyanates are based on polyisocyanates having exclusively aliphatically and/or cycloaliphatically bonded isocyanate groups and optionally containing uretdione, isocyanurate, iminooxadiazinetrione, urethane, allophanate, biuret and/or oxadiazinetrione groups. 3. The polyisocyanates according to claim 1, wherein the electron-withdrawing group X of the CH-acidic cyclic ketone is selected from the group consisting of ester, sulfoxide, sulfone, nitro, phosphonate, nitrile, isonitrile and carbonyl group. 4. A process for the preparation of organic polyisocyanates according to claim 1 comprising reacting A) one or more organic polyisocyanates with a mean isocyanate functionality of ≧1.8, with B) one or more CH-acidic cyclic ketones of general formula (I) : in which X is an electron-withdrawing group, R1, R2 independently of one another are a hydrogen atom, a saturated or unsaturated aliphatic or cycloaliphatic radical or an optionally substituted aromatic or araliphatic radical, which radicals in each case contain up to 12 carbon atoms and optionally up to 3 heteroatoms selected from the elements oxygen, sulfur and nitrogen, and are optionally substituted by halogen atoms, and n is an integer from 0 to 5, and C) optionally one or more other compounds reactive towards isocyanate groups, and D) optionally in the presence of one or more catalysts, in proportions such that the equivalent ratio of isocyanate groups in component A) to the sum of the groups reactive towards isocyanate groups in component B) and optionally C) is 0.7 to 1.3. 5. The process according to claim 4 wherein organic polyisocyanates having exclusively aliphatically and/or cycloaliphatically bonded isocyanate groups and optionally containing uretdione, isocyanurate, iminooxadiazinetrione, urethane, allophanate, biuret and/or oxadiazinetrione groups are used as the polyisocyanates A). 6. The process according to claim 4, wherein the electron-withdrawing group X of the CH-acidic cyclic ketone is selected from the group consisting of an ester, sulfoxide, sulfone, nitro, phosphonate, nitrile, isonitrile and carbonyl group. 7. The process according to claim 4, wherein polyols with a molecular weight (Mn) of 62-2000 g/mol and a mean OH functionality of at least 2.0 are used as the isocyanate-reactive compounds C). 8. A method of producing plastics comprising reacting the polyisocyanates according to claim 1 with a binder having groups reactive towards isocyanates. 9. Substrates coated with plastics according to claim 8. 10. The process of claim 4, wherein the polyisocyanates of A) are one or more selected from the group consisting of 1,4-butane diisocyanate, hexamethylene diisocyanate, 1,5-diisocyanato-2,2-dimethylpentane, 2,2,4-trimethyl-1,6-diisocyanatohexane, 2,4,4-trimethyl-1,6-diisocyanatohexane, 1,10-diisocyanatodecane, 1,3-diisocyanatocyclohexane and 1,4-diisocyanatocyclohexane, isophorone diisocyanate, 1-isocyanato-1-methyl-4(3)-isocyanatomethylcyclohexane, 4, 4'-diisocyanatodicyclohexyl-methane, 1,3-diisocyanato-2(4)-methylcyclohexane, triisocyanatononane, 1,3-phenylene diisocyanate, 1,4-phenylene diisocyanate, 2,4-toluylene diisocyanate, 2,6-toluylene diisocyanate, 2,4'-diphenylmethane diisocyanate, 4,4'-diphenylmethane diisocyanate, 1,5-naphthylene diisocyanate, and mixtures thereof. 11. The process of claim 4, wherein the catalyst D) is selected from the group consisting of dibutyltin dilaurate, zinc 2-ethylhexanoate, bismuth 2-ethylhexanoate and mixtures thereof. 12. The process of claim 4, wherein the CH-acidic cyclic ketones are selected from the group consisting of cyclopentanone-2-carboxymethyl ester, cyclopentanone-2-carboxyethyl ester, cyclopentanone-2-carbonitrile, cyclohexanone-2-carboxymethyl ester, cyclohexanone-2-carboxyethyl ester, cyclopentanone-2-carbonylmethane and mixtures thereof.
Disteldorf Josef (Herne DEX) Gras Rainer (Bochum DEX) Schnurbusch Horst (Herne DEX) Hbel Werner (Herne DEX) Wolf Elmar (Recklinghausen DEX), Polyurethane powder enamels free of cleavage products as well as enamel coatings produced from such powders.
Halpaap Reinhard (Koeln DEX) Pedain Josef (Koeln DEX) Kreuder Hans-Joachim (Krefeld DEX) Klein Gerhard (Monheim DEX) Schfer Walter (Leichlingen DEX) Arlt Dieter (Koeln DEX), Powder lacquer and its use for coating heat-resistant substrates.
Muller Hanns Peter (Leverkusen DT) Wagner Kuno (Leverkusen-Steinbuechel DT) Muller Richard (Bergisch-Neukirchen DT), Process for polyaddition products which contain uretdione groups and use in coatings.
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