Patents by Inventor Puwei Liu
Puwei Liu 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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Publication number: 20110265913Abstract: The present invention relates to polymer coated metal powders, such as metal powders used in the formation of solder alloys and pastes. The metal powders are coated with curable compositions of cyanoacrylates. The present invention relates to polymer coated metal powders, such as metal powders used in the formation of solder alloys and pastes. The metal powders are coated with curable compositions of cyanoacrylates, and once cured the coating on the metal powder is a cyanoacrylate polymer.Type: ApplicationFiled: May 23, 2011Publication date: November 3, 2011Applicants: Loctite (R&D) Limited, Henkel CorporationInventors: Puwei Liu, Matthew James Holloway, Blake Olsen
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Publication number: 20110213096Abstract: A curing agent for epoxy resin has one or more five- or six-membered aromatic rings, and substituted on the one or more five- or six-membered rings at least two functionalities reactive with the epoxy selected from the group consisting of hydroxyl, amine, imidazole, azine, hydrazide, anhydride, and Lewis acid groups. Choice of functionality can provide a mixed polymer network, one with a more densely cross-linked polymer structure having a high Tg, and the other with a more linear polymer structure to contribute to stress reduction.Type: ApplicationFiled: May 13, 2011Publication date: September 1, 2011Inventors: Pukun Zhu, Puwei Liu
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Patent number: 7973158Abstract: This invention relates to a novel synthesis for the preparation of benzoxazine components from phenolic components, aldehyde components, and amine components in a solvent other than toluene.Type: GrantFiled: May 1, 2009Date of Patent: July 5, 2011Assignees: Henkel Corporation, Henkel AG & Co. KGaAInventors: Andreas J. Taden, Puwei Liu, Alex C. Wong, Eric A. Parker
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Publication number: 20110133344Abstract: This invention relates to thermosetting resin compositions useful for flip chip (“FC”) underfill sealant materials, where a semiconductor chip is mounted directly onto a circuit through solder electrical interconnections. Similarly, the compositions are useful for mounting onto a circuit board semiconductor devices, such as chip size or chip scale packages (“CSPs”), ball grid arrays (“BGAs”), land grid arrays (“LGAs”) and the like, each of which having a semiconductor chip, such as large scale integration (“LSI”), on a carrier substrate.Type: ApplicationFiled: December 7, 2009Publication date: June 9, 2011Applicant: Henkel CorporationInventors: My Nhu Nguyen, Puwei Liu
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Patent number: 7851254Abstract: The present invention relates to b-stageable die attach adhesives, methods of preparing such adhesives, methods of applying such adhesives to the die and other substrate surfaces, and assemblies prepared therewith for connecting microelectronic circuitry.Type: GrantFiled: February 9, 2007Date of Patent: December 14, 2010Assignee: Henkel CorporationInventors: Deborah Derfelt Forray, Puwei Liu, Benedicto delos Santos
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Publication number: 20100140542Abstract: A composition of matter in liquid form at a temperature of 50° C. or less comprising a monofunctional benzoxazine compound embraced by the structure where R is a member selected from C1-40 alkyl, C2-40 alkenyl, each of which being optionally substituted or interrupted by one or more O, N, S, C?O, COO, and NHC?O, and C6-20 aryl, m is 0-4, and R1-R5 are independently selected from C1-10 alkyl, C2-40 alkenyl, each of which being optionally substituted or interrupted by one or more O, N, S, C?O, COOH, and NHC?O, and C6-20 aryl, and at least one of R1-R5 are present, is provided.Type: ApplicationFiled: December 18, 2009Publication date: June 10, 2010Applicant: Henkel CorporationInventors: Qing Ji, Puwei Liu, My N. Nguyen, Michael Todd
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Publication number: 20090270615Abstract: This invention relates to a novel synthesis for the preparation of benzoxazine components from phenolic components, aldehyde components, and amine components in a solvent other than toluene.Type: ApplicationFiled: May 1, 2009Publication date: October 29, 2009Applicants: Henkel Corporation, Henkel AG & Co. KGaAInventors: Andreas J. Taden, Puwei Liu, Alex C. Wong, Eric A. Parker
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Patent number: 7550825Abstract: The present invention relates to interlayer dielectric materials and pre-applied die attach adhesives, more specifically pre-applied die attach adhesives (such as wafer and other substrate-applied die attach adhesives), methods of applying the interlayer dielectric materials onto substrates to prepare low K dielectric semiconductor chips, methods of applying the pre-applied die attach adhesives onto wafer and other substrate surfaces, and assemblies prepared therewith for connecting microelectronic circuitry.Type: GrantFiled: June 5, 2007Date of Patent: June 23, 2009Assignee: Henkel CorporationInventors: Benedicto delos Santos, James T. Huneke, Puwei Liu, Kang Yang, Qing Ji
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Patent number: 7517925Abstract: In accordance with the present invention, there are provided novel benzoxazine compounds and thermosetting resin compositions prepared therefrom. Invention compositions are particularly useful for increasing adhesion at interfaces within microelectronic packages. Invention benzoxazines are useful for the preparation of invention compositions with properties which are associated with increased adhesion at interfaces, such as, for example, low shrinkage on cure and low coefficient of thermal expansion (CTE). In another aspect of the invention, there are provided die-attach pastes having increased interfacial adhesion. Invention die-attach pastes include benzoxazine-containing thermosetting resin compositions. In further aspects of the invention, there are provided methods for enhancing adhesive strength of thermosetting resin compositions and methods for enhancing adhesion of a substrate bound to a metallic surface by a thermosetting resin composition.Type: GrantFiled: December 11, 2003Date of Patent: April 14, 2009Assignee: Henkel CorporationInventors: Stephen M. Dershem, Puwei Liu, Farhad G. Mizori
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Publication number: 20080160315Abstract: The present invention relates to b-stageable die attach adhesives, methods of preparing such adhesives, methods of applying such adhesives to the die and other substrate surfaces, and assemblies prepared therewith for connecting microelectronic circuitry.Type: ApplicationFiled: February 9, 2007Publication date: July 3, 2008Inventors: Deborah Derfelt Forray, Puwei Liu, Benedicto delos Santos
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Patent number: 7312534Abstract: The present invention relates to interlayer dielectric materials and pre-applied die attach adhesives, more specifically pre-applied die attach adhesives (such as wafer and other substrate-applied die attach adhesives), methods of applying the interlayer dielectric materials onto substrates to prepare low K dielectric semiconductor chips, methods of applying the pre-applied die attach adhesives onto wafer and other substrate surfaces, and assemblies prepared therewith for connecting microelectronic circuitry.Type: GrantFiled: June 17, 2003Date of Patent: December 25, 2007Assignee: Henkel CorporationInventors: Benedicto delos Santos, James T. Huneke, Puwei Liu, Kang Yang, Qing Ji
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Publication number: 20070278683Abstract: The present invention relates to interlayer dielectric materials and pre-applied die attach adhesives, more specifically pre-applied die attach adhesives (such as wafer and other substrate-applied die attach adhesives), methods of applying the interlayer dielectric materials onto substrates to prepare low K dielectric semiconductor chips, methods of applying the pre-applied die attach adhesives onto wafer and other substrate surfaces, and assemblies prepared therewith for connecting microelectronic circuitry.Type: ApplicationFiled: June 5, 2007Publication date: December 6, 2007Applicant: Henkel CorporationInventors: Benedicto Santos, James Huneke, Puwei Liu, Kang Yang, Qing Ji
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Patent number: 7199249Abstract: In accordance with the present invention, there are provided novel coupling agents which are compatible with a wide variety of adhesive formulations and which provide substantial adhesion enhancement relative to base formulations to which they are added. Invention compounds comprise at least one free-radically polymerizable group (other than acrylate) and at least one reactive moiety which forms covalent bond(s) with substrates having free hydroxyl groups on the surface thereof. Thus, invention compounds are covalently linked to adhesive formulations upon free radical cure, while at the same time providing “residual” functionality which is capable of undergoing reaction with any substrate having reactive (e.g., hydroxyl) groups in the surface thereof.Type: GrantFiled: July 3, 2002Date of Patent: April 3, 2007Assignee: Henkel CorporationInventors: Puwei Liu, Stephen M. Dershem, Benjamin Neff, Maria Villegas
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Patent number: 7176044Abstract: The present invention relates to b-stageable die attach adhesives, methods of preparing such adhesives, methods of applying such adhesives to the die and other substrate surfaces, and assemblies prepared therewith for connecting microelectronic circuitry.Type: GrantFiled: June 12, 2003Date of Patent: February 13, 2007Assignee: Henkel CorporationInventors: Deborah Derfelt Forray, Puwei Liu, Benedicto delos Santos
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Patent number: 7037447Abstract: The present invention provides a thermoset conductive ink for use in through hole interconnections or similar electric and electronic applications to provide stable electrical connections. The conductive ink of this invention comprises a thermal curable resin system having an admixture of one or more maleimide, nadimide, or itaconimide containing resins, a comonomer and a catalyst, an electrically conductive material such as silver, copper or silver-coated copper, and optionally an organic solvent.Type: GrantFiled: July 23, 2003Date of Patent: May 2, 2006Assignee: Henkel CorporationInventors: Kang Yang, Puwei Liu
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Publication number: 20050288457Abstract: The present invention provides co-curable compositions in which an anionically or cationically reactive component, such as an epoxy or episulfide resin component; a free-radical polymerizable component; and a cross linking component, where the cross linking component is reactive with each of the anionically or cationically reactive component and the free radical polymerizable component through functionalization with at least one group reactive through an anionic or cationic mechanism and at least one group reactive through a free radical mechanism. The invention further provides methods of preparing such compositions, methods of applying such compositions to substrate surfaces, and assemblies prepared therewith for connecting microelectronic circuitry.Type: ApplicationFiled: October 20, 2003Publication date: December 29, 2005Inventors: Puwei Liu, Benjamin Neff, Zhengjue Zhang, Kang Yang
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Patent number: 6963001Abstract: In accordance with the present invention, there are provided thermosetting resin compositions with a reduced propensity to shrink in volume upon cure and methods of use therefor. The compositions of the present invention include compounds having aromatic, rigid-rod like spacer groups between the crosslinkable moieties. As such, these compounds impart a degree of liquid crystal-like character to the thermosetting resin composition which results in lower shrinkage upon cure. This effect follows from the well-known expansion that occurs when liquid crystal-like materials pass from a nematic liquid crystal-like state to an isotropic state. Further provided by the present invention are low shrinkage die attach pastes and methods of use therefor.Type: GrantFiled: February 14, 2003Date of Patent: November 8, 2005Assignee: Henkel CorporationInventors: Stephen M. Dershem, Kang Yang, Puwei Liu
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Patent number: 6960636Abstract: In accordance with the present invention, there are provided novel thermosetting resin compositions which do not require solvent to provide a system having suitable viscosity for convenient handling. Invention compositions have the benefit of undergoing rapid cure. The resulting thermosets are stable to elevated temperatures, are highly flexible, have low moisture uptake and are consequently useful in a variety of applications, e.g., in adhesive applications since they display good adhesion to both the substrate and the device attached thereto.Type: GrantFiled: January 13, 2003Date of Patent: November 1, 2005Assignee: Henkel CorporationInventors: Stephen M. Dershem, Puwei Liu
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Patent number: 6946523Abstract: In accordance with the present invention, there are provided novel heterobifunctional monomers and users for the same. Invention compounds have many of the properties required by the microelectronics industry, such as, for example, hydrophobicity, high Tg values, low dielectric constant, ionic purity, low coefficient of thermal expansion (CTE), and the like. These properties result in a thermoset that is particularly well suited to high performance applications where typical operating temperatures are often significantly higher than those at which prior art materials were suitable. Invention compounds are particularly ideal for use in the manufacture of electronic components, such as, for example, printed circuit boards, and the like.Type: GrantFiled: July 1, 2003Date of Patent: September 20, 2005Assignee: Henkel CorporationInventors: Stephen M. Dershem, Kevin J. Forrestal, Puwei Liu
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Publication number: 20050107542Abstract: In accordance with the present invention, there are provided film adhesive compositions comprising at least one macromonomer having at least one unit of ethylenic unsaturation, at least one thermoplastic elastomer co-curable with the macromonomer, and at least one cure initiator, and methods for use thereof. Invention compositions are useful as adhesives in the microelectronics industry. In particular, invention film adhesives may be used to produce microelectronic assemblies with very thin bond lines without compromising adhesive strength.Type: ApplicationFiled: December 13, 2004Publication date: May 19, 2005Inventors: Puwei Liu, Stephen Dershem, Kang Yang, Carolyn Albino