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AssigneeHenkel Kommanditgesellschaft auf Aktien
InventorsBernhard Gruenewaelder, Werner Haller, Bernhard Schoettmer, Thomas Empt, Hermann Kluth
Estimating the term…
A one-pack polyurethane adhesive containing a polyisocyanate prepolymer and at least one aminoether polyol, having a molar ratio of ether groups to amino nitrogen in the aminopolyether polyol of 7 to 30.
A one-pack polyurethane adhesive comprising a polyisocyanate prepolymer and at least one aminopolyether polyol, having a molar ratio of ether groups to amino nitrogen in the aminopolyether polyol of 7 to 30, and comprising one or more non-incorporable catalysts in a weight ratio of said catalysts to the at least one aminopolyether polyol of 20:1 to 1:3.
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Polyurethanes: from compounds containing nitrogen and active hydrogen, the nitrogen atom not being part of an isocyanate group
Processes: prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step: using…
Two or more polyethers of different physical or chemical nature: mixtures of polyethers containing at least one polyether containing nitrogen
Term ended 27 Mar 2023 (estimated)
This invention relates to a fast, one-pack polyurethane adhesive at least containing a polyisocyanate prepolymer and at least one aminopolyol.
The fast, durable fixing of workpieces is a problem frequently encountered in the home, in the workshop and in industry. In cases where mechanical fixing is not possible or is undesirable, corresponding workpieces are very often bonded. An adhesive suitable for this purpose has to be meet a variety of requirements according to the constituent material of the workpieces to be bonded and the stresses to which the bonded workpieces are subjected by outside influences, for example by moisture.
Thus, several materials, for example paper or paperboard, can be permanently fixed particularly quickly with known cyanoacrylate adhesives. However, known cyanoacrylate adhesives have disadvantages which prevent them from being used in many areas of workpiece bonding. For example, the adhesion of cyanoacrylate adhesives to wood is unsatisfactory so that the strength level of a wood-to-wood bond involving cyanoacrylate adhesives is poor. In addition, cyanoacrylate adhesives cannot be used for bonds where there are one or more gaps in the adhesive joint because such adhesives do not have any gap-filling properties.
Accordingly, the present invention relates to a one-pack polyurethane adhesive at least containing a polyisocyanate prepolymer and at least one aminopolyether polyol, the molar ratio of ether groups to aminonitrogen in the aminopolyether polyol being 7 to 30:1.
A one-pack polyurethane adhesive according to the invention contains at least one polyisocyanate prepolymer. A “polyisocyanate prepolymer” in the present context is understood to be a compound which has a molecular weight of at least 300 and, more particularly, at least 500, which contains more than one isocyanate group, preferably at least ca. 1.5 or at least ca. 2 isocyanate groups and which can be obtained by reaction of a compound containing at least one isocyanate-reactive functional group with a polyisocyanate containing more than one isocyanate group or by oligomerization of polyisocyanates.
Accordingly, polyfunctional aromatic or aliphatic isocyanates or oligomerized products with NCO groups produced therefrom or mixtures of two or more thereof are used for the production of the polyisocyanate prepolymers present in the one-pack PUR adhesives according to the invention.