3m Innovative Properties Company

Bernd Kuehneweg

Guido Hitschmann

Jan D Forster

Steffen Traser

Timothy N Narum

Ian Robinson

Stuart E Fores

Christian E Claus

Björn Weber

Rainer Kurz

Eva Maria Roggentin

Rudolf J Dams

Frans A Audenaert

Gunther Stollwerck

Frank Koehler

Christiane Strerath

Leonardus Doelen

Christoph Furtak

Christian Claus

Tobias Pick

Jan Daniel Forster

Leonardos AM Doelen

A multilayer protective tape for rotor blades of wind energy turbines is provided herein. The protective tape comprising a protective top layer comprising a polymer film, and an adhesive bottom layer. The top layer having a continuous surface (S) that is outwardly curved or outwardly trapezoidal such that the tape has a cross-sectional profile having an inner section between first and second edge lateral sections. The inner section comprises up to 30% of the width of the tape and has a thickness (Ti), while the first and second edge lateral sections have a thickness of T1 and T2, respectively, wherein Ti greater than each of T1 or T2, and the thickness (T1 or T2) of at least one edged lateral section is at most 600 &#x3bc;m and the thickness of the inner section (Ti) is at least 330 &#x3bc;m. Also provided is a method for applying the tape to rotor blades and a rotor blade protected by said protective tape.

Profiled protective tape for rotor blades of wind turbine generators

Provided are reactive compositions for making a polyurethane-based rain-erosion protective coating for rotor blades, the reactive composition comprising an isocyanate-reactive component and an isocyanate-functional component and wherein the isocyanate-reactive component comprises

Polyurethane-based protective coatings for rotor blades

The invention relates to a continuous self-metered process of forming a multilayer film comprising at least two superimposed polymer layers comprising the steps of: (i) providing a substrate (); (ii) providing two or more coating knives () which are offset, independently from each other, from said substrate () and/or from an adjacent coating knife to form at least one substrate gap () relative to the surface of the substrate () and at least one outlet gap () relative to the surface of an adjacent coating knife; (iii) moving the substrate () relative to the coating knives () in a downstream direction (), (iv) providing curable liquid precursors of the polymers (I, II, III) to the upstream side of the coating knives () thereby coating the two or more precursors (I, II, III) through the respective gaps () as superimposed layers () onto the substrate (); (v) optionally providing one or more solid films () and applying these essentially simultaneously with the formation of the adjacent lower polymer layer, and (vi) curing the precursor of the multilayer film thus obtained; wherein a lower layer of a curable liquid precursor (I, II, III) is covered by an adjacent upper layer of a curable liquid precursor (I, II, III) or a film (), respectively, essentially without exposing said lower layer of a curable liquid precursor (I, II, III).

Multilayer film having at least one thin layer and continuous process for forming such a film

A multilayer protective tape for rotor blades of wind energy turbines said tape having a protective top layer comprising a polymer film and an adhesive bottom layer, wherein the top layer has a continuous surface (S) that is outwardly curved or outwardly trapezoidal surface such that the tape has a cross-sectional profile having an inner section between two lateral sections and wherein the inner section has a thickness (Ti) made up by the thickness of the top layer and adhesive bottom layer that is greater than the thickness of at least one of the lateral sections (T1,T2) made up by the thickness of the top layer and adhesive bottom layer and wherein the thickness (T1 or T2) of at least one lateral section is at most 600 &#x3bc;m and the thickness of the inner section (Ti) is at least 330 &#x3bc;m. Also provided are processes for making profiled tapes and methods for applying the tapes to rotor blades and blades containing protective tapes.

The present invention relates to a scratch-resistant micro- and/or nanostructured surface comprising a plurality of micro-scale and/or nano-scale surface elements, said surface being essentially unchanged when being subjected to 10 rubbing cycles according to A.A.T.C.C. test method 8-1972 using a cotton cloth and a total stamp weight of 300 g, and comprising a polymeric material having 1) an elongation at break of at least 10%, 2) an irreversible relative plastic deformation (permanent set) of less than 2% and a 3) a tensile strength of at least 5 MPa. The present invention furthermore relates to a hydrophobic micro- and/or nanostructured surface comprising a plurality of micro-scale and/or nano-scale surface elements and having a static contact angle against water of at least 90, said surface comprising a polymeric material having 1) an elongation at break of at least 10%, 2) an irreversible relative plastic deformation (permanent set) of less than 2% and a 3) a tensile strength of at least 5 MPa.

Durable hydrophobic structured surface

There is provided a method of treatment including (i) applying a treatment composition to at least a portion of the surface of a wheel rim and (ii) allowing a thus applied treatment composition to cure. There is also provided compounds and compositions useful in the method.

Method for treating wheel rims and composition for use therein

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Duesseldorf, Germany

Bernd Kuehneweg