Henkel Ag & Company, Kgaa

Henkel Corporation

Henkel Kommanditgesellschaft Auf Aktien

Loctite (r&d) Limited

Rajat K Agarwal

William E Fristad

Olaf Lammerschop

Gregory A Ferguson

Brian D Bammel

Elizabeth J Siebert

Zhiqi Yang

Xaver Muenz

Michael S Puckett

Scott L Hartsell

Gregg W Rossier

Rainer Schoenfeld

Barry N Burns

Thomas Fay-Oy Lim

Chiu-Sing Lin

Bernd Mayer

Jonathan P Wigham

Shingo Tsuno

Jeng-Li Liang

Martin J Fitzpatrick

Hubert K Schenkel

Matthew James Holloway

David Sturgill

Christopher G Weller

Vettithara C Koshy

Mary B Ward

Christian Scheffner

Thomas Leeb

Roman M Skikun

Douglas Brown

Graham Butcher

Zafar Iqbal

This invention relates to compositions useful as adhesives and more particularly to the preparation of heat-curable epoxy-based adhesive compositions that are resistant to being washed off substrate surfaces prior to being cured. The incorporation of a solid diene-based rubber, in particular an acrylonitrile-butadiene copolymer rubber having a relatively high Mooney viscosity, significantly enhances the wash-off resistance of the adhesive, while still allowing the adhesive to be readily dispensed by pumping under high shear conditions.

Epoxy-paste adhesives resistant to wash-off

This invention relates to compositions useful as adhesives and more particularly to the preparation of heat-curable epoxy-based adhesive compositions that are capable of being easily pumped under high shear at temperatures around room temperature but are resistant to being washed off substrate surfaces prior to being cured.

Pumpable epoxy paste adhesives resistant to wash-off

Expandable, thermally curable compositions containing at least one epoxy resin, at least one polyester, at least one blowing agent, and at least one curing agent are useful as adhesives and structural reinforcement materials. When foamed and adhered to a metal substrate surface, such polyester-modified foamable compositions can exhibit improved adhesion to the substrate surface after exposure to a corrosive environment, as compared to compositions that do not contain polyester. Furthermore, these compositions can exhibit improved flow properties in the uncured state at temperatures between 50 and 100&#xb0; C. They are granulatable, with the granules produced thereby having non-tacky surfaces at room temperature and being capable of being readily processed into molded objects by injection molding processes.

Foamable compositions based on epoxy resins and polyesters

The present invention provides curable poly(acrylate) compositions, cured reaction products of which demonstrate improved resistance to shrinkage when exposed to hydrocarbon fluids, such as transmission fluids and oil-and fuel-based fluids.

Polyacrylate compositions

This invention relates to compositions useful as adhesives and more particularly to the preparation of heat-cured epoxy-based adhesive compositions with improved impact resistance and good adhesion to oily metal substrates.

Epoxy compositions having improved impact resistance

Expandable thermosettable compositions containing at least one epoxy resin, at least one finely divided thermoplastic polymer powder, at least one blowing agent, at least one curing agent, and at least one filler are suitable for the production of thermosetting laminated bodies with a tacky surface. These laminated bodies can be produced and handled in a simple manner and are suitable for stiffening and reinforcing flat structural components, in particular vehicle body structural components, such as vehicle body frames, doors, trunk lids, engine hoods and/or roof components in automobile construction. The expandable thermosettable compositions are also suitable for the production of thermosetting, thermally expandable shaped articles for reinforcing hollow structural members by the injection molding process. In preferred embodiments, the composition is injected onto a metallic or thermoplastic carrier. These thermally expandable shaped articles are especially useful in the production of automobiles and other vehicles to maintain or increase the strength of structural members such as rockers, pillars, radiator support beams, doors, reinforcing beams, and the like.

Expandable epoxy resin-based systems modified with thermoplastic polymers

The present invention is directed to a high expansion two-component structural foam that expands to about twice its original volume while maintaining good cell structure. The foam of the present invention is based on epoxy resins. Each component of the foam system exhibits storage stability, e.g., no phase separation, yet reacts when combined to provide a cured material having exceptionally good compression strength and modulus. The blowing system used to prepare the foam produces a foam which is uniform in appearance and is essentially free of the large voids often found in conventional two-part thermosettable compositions, even when a relatively large mass is utilized.

High expansion two-component structural foam

Autodeposited coatings useful for protecting metal surfaces and in production of rubber-to-metal composites are obtained by curing adducts based on epoxy resins which are adhered to the metal surface. One or more epoxy resins, such as for example, the combination of a diglycidyl ether of bisphenol A and a flexibilizing epoxy resin, may be prereacted to form an adduct of higher average molecular weight than the starting epoxy resins. Said adduct may then be dispersed in water, with the resulting dispersion being used in an autodeposition bath composition.

Epoxy resin-based autodeposition coatings

A film of a polymer or polymer precursor such as an epoxy resin is autodeposited on an active metal surface and then used to form an adhesive bond directly between the metal surface and the surface of a rubber substrate. Excellent adhesion of the metal to the rubber is obtained without the need to either phosphate the metal surface or use a primer or adhesive other than the autodeposited coating.

Method of forming rubber-metal composites

Autodeposition compositions for polymeric coatings of reduced gloss, good corrosion resistance, and uniform appearance are prepared using a combination of acrylic and epoxy resins.

Autodeposition compositions

The anticorrosive properties of a coating autodeposited on a metal substrate are improved by contacting the autodeposited coating with an aqueous solution containing Group IIA or Group IIB metal cations (e.g., calcium or zinc cations) and phosphate anions prior to curing. The rinse solution is preferably acidic and can be prepared, for example, from calcium nitrate and an oxy acid of phosphorus or zinc dihydrogen phosphate. Optionally, the rinse solution also includes an accelerator such as hydroxylamine.

Protective reaction rinse for autodeposition coatings

An autodepositing liquid composition comprises dispersed non-film-forming polymer particles in addition to the dispersed film forming polymer characteristic of all autodepositing liquid compositions. Preferably, the non-film-forming polymer particles are gas-tight microballoons filled with a gas such as air and have an average particle size less than 1 &mgr;m. Such particles act in the autodepositing liquid compositions and in the dried coatings formed from them as opaque white pigments, unless the coatings are heated above about 130&deg; C., if so heated, the coatings, unless they contain other heat stable pigment, become irreversibly transparent.

Autodepositable aqueous compositions including dispersed non-film-forming polymers

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Brighton, MI, United States of America

Rajat K Agarwal