Abstract:
Polyurethane foam is made by reacting an isocyanate with a polyol and foam forming ingredients in the presence of a reactive double bond component, particularly an acrylate, to give a foamed body which is subjected to radical initiated cross-linking with the reactive double bond component. In one embodiment the foam-formation and cross-linking are carried out in parallel, and an organic peroxide may be included as a cross-linking initiator. In another embodiment the cross-linking is carried out after foam-formation preferably using E-beam activation. In this case different formulations, using polyether polyol with MW greater than 1500, non MDI, polymer modified polyol or non HR formulations are used. In this case also, it is also possible to use selected formulations which give at least 10% hardness increase without scorching, or which, by controlled use of 0.1 to 10 parts double bond component give low density foams with more than 4 parts water as foaming agent, without scorching.
Abstract:
Gegenstand der Erfindung ist ein Verfahren zur Herstellung von von Polyurethan-Weichschaumstoffen, insbesondere von Polyurethan-Formweichschaumstoffen, durch Umsetzung von a) Polyisocyanaten mit b) Verbindungen mit mindestens zwei mit Isocyanatgruppen reaktiven Wasserstoffatomen, dadurch gekennzeichnet, dass als Verbindungen mit mindestens zwei mit Isocyanatgruppen reaktiven Wasserstoffatomen b) mindestens ein mittels DMC-Katalysator hergestellter Polyetheralkohol bi) mit einer Hydroxylzahl im Bereich von 15 bis 35 mgKOH/g, einem Gehalt an Ethylenoxid im Bereich von 5 bis 18 Gew.-%, bezogen auf das Gesamtgewicht des Polyetheralkohols, und einem Endblock aus Ethylenoxid und Propylenoxid mit einem Gehalt an Ethylenoxid von 25 bis 75 Gew.-%, bezogen auf die Menge des Alkylenoxids im Endblock, eingesetzt wird.
Abstract:
The present invention pertains to non-fugitive amine catalysts wherein the catalyst contains at least one imine and at least one tertiary amine moiety. Such catalysts are suitable for the production of polyurethane products.
Abstract:
A viscoelastic foam system is provided having an amine-based polyoxypropylene extended polyol to impart strength, recoverability and endurance to the foam, and an appropriately selected non-amine-based polyol to provide flexibility to the foam. The combination of amine-based propylene oxide extended polyol and non-amine-based polyol provides a viscoelastic semi-rigid foam with excellent impact and recovery properties, recovering to substantially 100 % of its initial volume and shape following an impact, yet with sufficient rigidity and stiffness so that it is effective at absorbing multiple impacts. A method of making the above viscoelastic foam is also provided.
Abstract:
An aldehyde composition derived by hydroformylation of a transesterified seed oil and containing a mixture of formyl-substituted fatty acids or fatty acid esters having the following composition by weight: greater than about 10 to less than about 95 percent monoformyl, greater than about 1 to less than about 65 percent diformyl, and greater than about 0.1 to less than about 10 percent triformyl-substituted fatty acids or fatty acid esters, and having a diformyl to triformyl weight ratio of greater than about 5/1; preferably, greater than about 3 to less than about 20 percent saturates; and preferably, greater than about 1 to less than about 20 percent unsaturates. An alcohol composition derived by hydrogenation of the aforementioned aldehyde composition, containing a mixture of hydroxymethyl-substituted fatty acids or fatty acid esters having the following composition by weight: greater than about 10 to less than about 95 percent monoalcohol {mono(hydroxymethyl)}, greater than about 1 to less than about 65 percent diol {di(hydroxymethyl)}, greater than about 0.1 to less than about 10 percent triol, tri(hydroxmethyl)-substituted fatty acids or fatty acid esters; preferably greater than about 3 to less than about 35 percent saturates; and preferably, less than about 10 percent unsaturates. The alcohol composition can be converted into an oligomeric polyol for use in the manufacture of polyurethane slab stock flexible foams.
Abstract:
Polyol combination comprising up to a total of 100 parts by weight of (1) 1 to 15 parts by weight of a polyalkoxylated monol having a number average molecular weight in the range of from 400 to 4000, (2) 50 to 97 parts by weight of a polyalkoxylated diol having a number average molecular weight in the range of from 1000 to 7000, and (3) 2 to 40 parts by weight of a polyoxyalkylated polyol having solid polymer particles stably dispersed therein (herinafter referred to as "polymer polyol"), which polyoxyalkylated polyol has a nominal functionality of at least 3; a formulation for preparing a foam comprising such polyol combination and a process of preparing a viscoelastic high resilience polyurethane foam with the help of such polyol combination.
Abstract:
Gegenstand der Erfindung sind Graftpolyole mit bimodaler Teilchengrössenverteilung und einem Gesamtfeststoffgehalt von 5 bis 65 Gew.-%, enthaltend kleine Teilchen mit einem Teilchendurchmesser von 0,05 bis 0,7 μm und grosse Teilchen mit einem Teilchendurchmesser von 0,4 bis 5,0 μm, wobei sich die bei der Darstellung mit der Methode der Lichtstreuungsuntersuchung gemessenen Peaks der grossen und kleinen Teilchen nicht überlappen, und einen Gesamtgehalt der Feststoffe mit den definierten Teilchengrössen, bestehend aus einem Volumenanteil von 5 bis 45 % kleinen Teilchen und einem Volumenanteil von 95 bis 55 % grossen Teilchen, wobei diese Volumenanteile sich zu 100 % ergänzen, sowie Verfahren zu deren Herstellung. Weiterhin betrifft die Erfindung die Verwendung solcher Graftpolyole zur Herstellung von Polyurethanen.
Abstract:
Gegenstand der Erfindung ist ein Verfahren zur Herstellung von Polyetheralkoholen durch katalytische Anlagerung von Alkylen-oxiden an H-funktionelle Startsubstanzen unter Verwendung von Aminen als Katalysatoren, dadurch gekennzeichnet, dass die Zugabe der Amine zur Reaktionsmischung von oder zu Beginn der Anlagerung der Alkylenoxide sowie im Verlaufe der Umsetzung noch mindestens einmal erfolgt, wobei die nochmalige Zugabe des Katalysators an dem Punkt der Reaktion, bei dem es zu einem starken Ablauf von Nebenreaktionen kommt, und/oder bei Wechsel der Alkylenoxide in der Polyetherkette erfolgt.
Abstract:
An improved process to enhance polyurethane foam performance is described. Polyurethane foam is prepared by reactions between a polyisocyanate and a polyfunctional isocyanate-reactive component wherein said reactions are conducted in the presence of catalysts composed of (a) a specific reactive tertiary amine compound selected from the group consisting of bis(dimethylaminopropyl)amino-2-propanol, bis(dimethylaminopropyl)amine, dimethylaminopropyldipropanolamine, bis(dimethylamino)-2-propanol, N,N,N'-trimethyl-N'-hydroxyethyl-bis(aminoethyl)ether and mixtures thereof; and (b) at least one carboxylic acid salt of the specific reactive tertiary amine compound selected from the group consisting of hydroxy-carboxylic acid salts and halo-carboxylic acid salts.
Abstract:
This invention relates to a process for the preparation of a flexible foam. This process comprising reacting a liquid, storage stable, allophanate-modified polyisocyanate having an NCO group content of about 20 to about 42 %, with an isocyanate-reactive component, in the presence of a blowing agent and at least one catalyst,wherein the relative amounts of the polyisocyanate and the isocyanate-reactive component are such that the NCO index is from about 70 to about 130.