Patents by Inventor Rajat K. Agarwal
Rajat K. Agarwal has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9133375Abstract: 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.Type: GrantFiled: April 29, 2010Date of Patent: September 15, 2015Assignee: Henkel AG & Co. KGaAInventors: David Sturgill, Scott L. Hartsell, Jeng-Li Liang, Rajat K. Agarwal
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Patent number: 8545667Abstract: 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.Type: GrantFiled: June 4, 2010Date of Patent: October 1, 2013Assignee: Henkel AG & Co. KGaAInventors: Olaf Lammerschop, Scott Hartsell, Rajat K. Agarwal
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Patent number: 8288447Abstract: 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° 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.Type: GrantFiled: December 8, 2008Date of Patent: October 16, 2012Assignee: Henkel AG & Co. KGaAInventors: Xaver Muenz, Bernd Mayer, Christian Scheffner, Rajat K. Agarwal, Michael S. Puckett, Gregory A. Ferguson, Olaf Lammerschop
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Patent number: 8088850Abstract: 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.Type: GrantFiled: May 30, 2007Date of Patent: January 3, 2012Assignee: Henkel CorporationInventors: Chiu-Sing Lin, Shingo Tsuno, Rajat K. Agarwal, Thomas Fay-Oy Lim
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Publication number: 20100272908Abstract: 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.Type: ApplicationFiled: April 29, 2010Publication date: October 28, 2010Applicant: Henkel AG & Co. KGaAInventors: David Sturgill, Scott L. Hartsell, Jeng-Li Liang, Rajat K. Agarwal
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Publication number: 20100176650Abstract: A decorative overlay comprised of thin plastic or metal may be securely fastened to a wheel using one or more preformed, solid, dimensionally stable, heat-activatable adhesive bodies. The use of such adhesive bodies offers significant processing and performance advantages over conventional methods for cladding wheels.Type: ApplicationFiled: December 10, 2009Publication date: July 15, 2010Applicant: Henkel AG & Co. KGaAInventors: Timothy J. Zens, Rajat K. Agarwal, James E. Thompson, Gregory A. Ferguson, Scott J. Beleck, David Inkpen
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Publication number: 20100130655Abstract: This invention relates to compositions useful as adhesives and more particularly to epoxy-based adhesive compositions with improved impact resistance.Type: ApplicationFiled: January 25, 2010Publication date: May 27, 2010Applicants: Henkel Corporation, Loctite (R&D) LimitedInventors: Rajat K. Agarwal, Olaf Lammerschop, Barry N. Burns
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Publication number: 20090176903Abstract: 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° 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.Type: ApplicationFiled: December 8, 2008Publication date: July 9, 2009Applicant: HENKEL AG & CO. KGAAInventors: Xaver Muenz, Bernd Mayer, Christian Scheffner, Rajat K. Agarwal, Michael S. Puckett, Gregory A. Ferguson, Olaf Lammerschop
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Patent number: 7473717Abstract: 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.Type: GrantFiled: June 14, 2004Date of Patent: January 6, 2009Assignee: Henkel AG & Co. KGaAInventors: Xaver Muenz, Thomas Leeb, Rajat K. Agarwal, Gregory A. Ferguson, Michael Puckett
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Patent number: 7119149Abstract: 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.Type: GrantFiled: January 3, 2003Date of Patent: October 10, 2006Assignee: Henkel Kommanditgesellschaft AUFInventors: Gregory A. Ferguson, Rajat K. Agarwal, Vettithara C. Koshy
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Publication number: 20040266899Abstract: 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.Type: ApplicationFiled: June 14, 2004Publication date: December 30, 2004Inventors: Xaver Muenz, Thomas Leeb, Rajat K. Agarwal, Gregory A. Ferguson, Michael Puckett
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Patent number: 6833398Abstract: 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.Type: GrantFiled: October 24, 2002Date of Patent: December 21, 2004Assignee: Henkel Kommanditgesellschaft auf AktienInventors: Rajat K. Agarwal, Brian D. Bammel, William E. Fristad, Gregg W. Rossier, Elizabeth J. Siebert, Zhiqi Yang
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Patent number: 6805768Abstract: 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.Type: GrantFiled: February 20, 2001Date of Patent: October 19, 2004Assignee: Henkel Kommanditgesellschaft auf AktienInventors: Rajat K. Agarwal, William E. Fristad, Gregg W. Rossier, Roman M. Skikun
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Publication number: 20040131840Abstract: 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.Type: ApplicationFiled: January 3, 2003Publication date: July 8, 2004Inventors: Gregory A. Ferguson, Rajat K. Agarwal, Vettithara C. Koshy
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Publication number: 20040082673Abstract: The use of an adduct of an isocyanate resin and an isocyanate-reactive epoxy resin in an expandable thermosettable composition helps to reduce the tackiness of the composition and also increases its dimensional stability, as compared to compositions in which only non-adducted epoxy resins are present.Type: ApplicationFiled: April 23, 2002Publication date: April 29, 2004Inventor: Rajat K. Agarwal
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Patent number: 6645633Abstract: Autodeposition compositions for polymeric coatings of reduced gloss, good corrosion resistance, and uniform appearance are prepared using a combination of acrylic and epoxy resins.Type: GrantFiled: September 25, 2001Date of Patent: November 11, 2003Assignee: Henkel CorporationInventors: Christopher G. Weller, Elizabeth J. Siebert, Zhiqi Yang, Rajat K. Agarwal, William E. Fristad, Brian D. Bammel
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Patent number: 6613387Abstract: 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.Type: GrantFiled: November 21, 2001Date of Patent: September 2, 2003Assignee: Henkel CorporationInventors: Rajat K. Agarwal, Douglas Brown, William E. Fristad, Graham Butcher, Zafar Iqbal
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Publication number: 20030104212Abstract: 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.Type: ApplicationFiled: October 24, 2002Publication date: June 5, 2003Inventors: Rajat K. Agarwal, Brian D. Bammel, William E. Fristad, Gregg W. Rossier, Elizabeth J. Siebert, Zhiqi Yang
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Patent number: 6559204Abstract: 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° C., if so heated, the coatings, unless they contain other heat stable pigment, become irreversibly transparent.Type: GrantFiled: March 26, 2001Date of Patent: May 6, 2003Assignee: Henkel CorporationInventor: Rajat K. Agarwal
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Publication number: 20030068498Abstract: Autodeposition compositions for polymeric coatings of reduced gloss, good corrosion resistance, and uniform appearance are prepared using a combination of acrylic and epoxy resins.Type: ApplicationFiled: September 25, 2001Publication date: April 10, 2003Inventors: Christopher G. Weller, Elizabeth J. Siebert, Zhiqi Yang, Rajat K. Agarwal, William E. Fristad, Brian D. Bammel