Patents by Inventor Pui Kwan Wong
Pui Kwan Wong 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: 20150183703Abstract: The invention relates to a process for preparing a dicarboxylic acid comprising the steps: (a) heating a lactone in the presence of a first catalyst system to produce an alkenoic acid; and (b) contacting the alkenoic acid with carbon monoxide, water and a second catalyst system to produce a reaction composition comprising the second catalyst system and the dicarboxylic acid.Type: ApplicationFiled: March 28, 2012Publication date: July 2, 2015Applicant: Agency for Science, Technology and ResearchInventors: Pui Kwan Wong, Chuanzhao Li, Ludger Stubbs, Martin Van Meurs, Daniel Gait Anak Kumbang, Sharon Chun Yan Lim, Eite Drent
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Publication number: 20150133685Abstract: The invention provides a process for the production of a diene. In the process, a lactone is heated in the presence of a first catalyst system to produce an alkene and carbon dioxide and the alkene is contacted with a second catalyst system to produce an alkyldiene.Type: ApplicationFiled: March 28, 2013Publication date: May 14, 2015Applicant: Agency for Science, Technology and ResearchInventors: Ludger Stubbs, Chuanzhao Li, Pui Kwan Wong, Martin van Meurs
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Patent number: 8853330Abstract: Described herein are polymers comprising a polyester and at least one polyhedral oligomeric silsesquioxane, wherein the polyester is capable of forming a stereocomplex with a polymer comprising a complimentary polyester and composites thereof.Type: GrantFiled: February 4, 2013Date of Patent: October 7, 2014Assignee: Agency for Science Technology and ResearchInventors: Yew Wei Leong, Beng Hoon Maureen Tan, Ting Ting Lin, Yang Choo Chua, Weng Weei Tjiu, Chaobin He, Pui Kwan Wong
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Publication number: 20130030128Abstract: The brittleness of a thermoplastic material containing a polylactic acid may be reduced by melting and mixing the thermoplastic material and a graft copolymer to link the graft copolymer to thermoplastic polymer to form a new thermoplastic material with reduced brittleness. The graft copolymer comprises an elastomeric backbone and a side chain grafted to the backbone. The side chain comprises a enantiomer of lactic acid opposite to the enantiomer in the thermoplastic material. A composition comprises a thermoplastic polymer and the graft copolymer, where the graft copolymer is linked to the thermoplastic polymer by the enantiomers. A method of forming the composition may comprise melting precursors for the thermoplastic polymer and the graft copolymer, and mixing the precursors to allow the lactic acids to link the graft copolymer to the thermoplastic polymer.Type: ApplicationFiled: April 14, 2011Publication date: January 31, 2013Applicant: Agency for Science, Technology and ResearchInventors: Chaobin He, Ting Ting Lin, Pui Kwan Wong, Suming Ye
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Publication number: 20130030122Abstract: A composition is provided, which comprises chains comprising a first graft copolymer of a first elastomer and a poly(L-lactic acid), and chains comprising a second graft copolymer of a second elastomer and a poly(D-lactic acid). At least some of the poly(L-lactic acid) and poly(D-lactic acid) crosslink the chains. Poly(L-lactic acid) and poly(D-lactic acid) may form stereocomplexes that crosslink the chains. The chains may be crosslinked by crystalline structures formed from at least some of the poly(L-lactic acid) and poly(D-lactic acid) in discrete regions. The crosslinked chains may form a matrix. In a method of forming the composition, the first and second graft copolymers are mixed, such as by melt blending or solution casting, to form the composition. The graft copolymers may be formed by a “grafting-though” or “grafting-from” process. The composition may be useful under a relatively wide range of temperatures.Type: ApplicationFiled: April 14, 2011Publication date: January 31, 2013Applicant: Agency for Science, Technology and ResearchInventors: Chaobin He, Ting Ting Lin, Pui Kwan Wong, Suming Ye
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Patent number: 6515174Abstract: The present invention relates to reaction products formed from maleic anhydride and amino carboxylic acids. The reaction products are particularly useful for grafting polyolefins to increase their polarity and therefore enhance their physical properties.Type: GrantFiled: January 16, 2001Date of Patent: February 4, 2003Assignee: Shell Oil CompanyInventors: Manuel Soler Rodriguez, Charles Chiu-Hsiung Hwo, Pui Kwan Wong, Pierre Nazareth Tu{overscore (t)}unjian, Charles Lee Edwards
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Publication number: 20020177740Abstract: A process for the manufacture of a polyphenol compound such as bisphenol-A by introducing into a reaction zone a phenolic compound reactant, a carbonyl compound reactant, and a catalyst promoter comprising a dithioketal compound, and reacting the ingredients within the reaction zone in the presence of an acid catalyst.Type: ApplicationFiled: April 13, 2001Publication date: November 28, 2002Inventors: David Palmer, Pui Kwan Wong
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Patent number: 6465697Abstract: A process for the manufacture of a polyphenol compound such as bisphenol-A by introducing into a reaction zone a phenolic compound reactant, a carbonyl compound reactant, and a catalyst promoter comprising a dithioketal compound, and reacting the ingredients within the reaction zone in the presence of an acid catalyst.Type: GrantFiled: April 13, 2001Date of Patent: October 15, 2002Assignee: Resolution Performance Products LLCInventors: David Palmer, Pui Kwan Wong
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Patent number: 6448333Abstract: A grafted polyolefin polymers having high polarity produced by grafting bi-functional N-substituted diacids to maleated or other functional group grafted polyolefin. The new polymers exhibit improved water miscibility, compatability and good adhesion to polar materials such as nylon, polyester, glass, and metal substrates.Type: GrantFiled: December 16, 1999Date of Patent: September 10, 2002Assignee: Shell Oil CompanyInventors: Manuel Soler Rodriguez, Pierre Nazareth Tutunjian, Charles Lee Edwards, Paul Karol Casey, Carlton Edwin Ash, Charles C. Hwo, Pui Kwan Wong
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Publication number: 20010007001Abstract: The present invention relates to reaction products formed from maleic anhydride and amino carboxylic acids. The reaction products are particularly useful for grafting polyolefins to increase their polarity and therefore enhance their physical properties.Type: ApplicationFiled: January 16, 2001Publication date: July 5, 2001Inventors: Manuel Soler Rodriguez, Charles Chiu-Hsiung Hwo, Pui Kwan Wong, Pierre Nazareth Tutunjian, Charles Lee Edwards
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Patent number: 6231960Abstract: Biodegradable and/or compostable polymers are made from isoprene, 2,3-dimethyl-1,3-butadiene or like conjugated dienes and a crosslinking agent having a cleavable linking group such as ethylene glycol dimethacrylate. These polymers can be used to make absorbent foams that are useful in absorbent articles such as diapers, as well as other biodegradable articles such as films, and latexes useful as binders and adhesives.Type: GrantFiled: November 7, 1997Date of Patent: May 15, 2001Assignee: The Procter & Gamble CompanyInventors: John C. Dyer, Bryn Hird, Pui Kwan Wong
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Patent number: 6225419Abstract: An grafted polymeric amine is provided, the grafted polymeric amine including: N-substituted 2,5-pyrrolediyl groups incorporated in the backbone wherein the N-substituted 2,5-pyrrolediyl group may be represented by the general formula wherein R independently represents a hydrogen or a hydrocarbyl group and B represents the substituent containing at least one primary amino group; and vinyl monomers grafted to a polyketone backbone. This grafted polymeric amine is useful as a component in a wood glue composition.Type: GrantFiled: February 19, 1999Date of Patent: May 1, 2001Assignee: Shell Oil CompanyInventor: Pui-Kwan Wong
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Patent number: 6221967Abstract: The present invention relates to reaction products formed from maleic anhydride and amino carboxylic acids. The reaction products are particularly useful for grafting polyolefins to increase their polarity and therefore enhance their physical properties.Type: GrantFiled: December 16, 1999Date of Patent: April 24, 2001Assignee: Shell Oil CompanyInventors: Manuel Soler Rodriguez, Charles Chiu-Hsiung Hwo, Pui Kwan Wong, Pierre Nazareth Tutunjian, Charles Lee Edwards
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Patent number: 6217702Abstract: Relatively low molecular weight olefin/CO polymers are graft copolymerized. The graft copolymers provide the basis for waterborne adhesives that are particularly useful for making wood composites.Type: GrantFiled: June 29, 1999Date of Patent: April 17, 2001Assignee: Shell Oil CompanyInventor: Pui Kwan Wong
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Patent number: 6214941Abstract: A functionalized polyketone and a method to make this functionalized polyketone is provided, the method including the steps of: providing a polyketone; contacting the polyketone with a functional group containing monomer, the functional group containing monomer having a double bond between two carbons, at a temperature between about 180° C. and 275° C., for a time period effective for at least 10% by weight of the resultant grafted polymer to be grafted monomer units; and recovering the grafted polyketone.Type: GrantFiled: November 12, 1998Date of Patent: April 10, 2001Assignee: Shell Oil CompanyInventor: Pui-Kwan Wong
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Patent number: 6201075Abstract: Relatively low molecular weight olefin/CO polymers are graft copolymerized. The graft copolymers provide the basis for waterborne adhesives that are particularly useful for making wood composites.Type: GrantFiled: June 29, 1999Date of Patent: March 13, 2001Assignee: Shell Oil CompanyInventor: Pui Kwan Wong
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Patent number: 6147141Abstract: A novel thermally reworkable die attach adhesive composition for attaching a semiconductor device to a substrate is provided. The composition comprises(a) a thermally reworkable crosslinked resin produced by reacting at least one dienophile having a functionality greater than one and at least one 2,5-dialkyl substituted furan-containing polymer, and(b) at least one thermally and/or electrically conductive material present in an effective amount up to about 90% by weight of the die attach composition to provide a conducting medium.Type: GrantFiled: March 8, 1999Date of Patent: November 14, 2000Assignee: Shell Oil CompanyInventors: Shridhar R. Iyer, Pui Kwan Wong
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Patent number: 6133356Abstract: Relatively low molecular weight olefin/CO polymers are graft copolymerized. The graft copolymers provide the basis for waterborne adhesives that are particularly useful for making wood composites.Type: GrantFiled: December 10, 1997Date of Patent: October 17, 2000Assignee: Shell Oil CompanyInventor: Pui Kwan Wong
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Patent number: 6114588Abstract: A method to produce dialcohols is provided, the method comprising the steps of:providing a feed stream comprising an alpha-alcohol-diolefin;reacting the feed stream with hydrogen and carbon monoxide in the presence of a catalyst system comprising a cobalt phosphine ligand complex under conditions effective to hydroformylate at least a portion of the diolefin in the feed stream; andrecovering the dialcohol from the reacted feed stream. This method is a one-step process to hydroformylate alpha-alcohol-diolefins such as 2,7-octadien-1-ol to produce a significant yield of dialcohols such as 1,9-nonanediol.Type: GrantFiled: June 11, 1998Date of Patent: September 5, 2000Assignee: Shell Oil CompanyInventors: Pui-Kwan Wong, Andrew Allison Moxey
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Patent number: 6103645Abstract: A method is provided to prepare a filter material, the method comprising the steps of: providing a porous substrate; preparing a high internal phase emulsion wherein the external phase of the emulsion comprises polymerizable monomers, and the internal phase is a non-polymerizable phase; impregnating the high internal phase emulsion into the substrate felt; and polymerizing the polymerizable monomers. A layer of cured foam as is thereby formed on the substrate and within pore volumes of the substrate. The cured foam can have a high porosity, small pore size, and low density, resulting in a filter material having a high efficiency in removal of particles, at a lower pressure drop than alternative high efficiency filter materials.Type: GrantFiled: June 12, 1998Date of Patent: August 15, 2000Assignee: Shell Oil CompanyInventors: Benjamin Tai An Chang, Pui Kwan Wong, Troug Van Mai