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| Number | Title | Issue Date |
| 7022885 | Purification on methyl tertiary butyl ether The present invention relates to purification of an MTBE process stream by contact in the liquid phase with a large pore zeolite such as 13X or Zeolite Y. ... | 04/04/2006 |
| 6960671 | Process for direct oxidation of propylene to propylene oxide and large particle size titanium silicalite catalysts for use therein Large crystals of titanium silicalite or intergrowths of intergrown smaller crystals, having a mean particle size greater than 2 μm, have been found catalytically effective at commercially reasonable rates for the epoxidation of olefins in the presence of hydrogen ... | 11/01/2005 |
| 6930143 | Acrylic latex composition An acrylic emulsion is disclosed. The emulsion comprises from about 30% to about 90% by weight of water, about 10% to about 70% by weight of an acrylic polymer, about 0.2% to about 10% by weight of a emulsifying agent, and up to 20% by weight of an organic solvent. ... | 08/16/2005 |
| 6914167 | Vent recovery system A process for absorbing propylene from a gaseous propylene oxide process purge stream wherein propane liquid is used to absorb the propylene. ... | 07/05/2005 |
| 6906200 | Production of N-vinyl pyrrolidone N-vinyl pyrrolidone is produced by dehydration of N-hydroxyethyl pyrrolidone in the presence of an amorphous mixed oxide catalyst such as an amorphous Ca/Zn oxide catalyst. ... | 06/14/2005 |
| 6906136 | UV-curable compositions A UV-curable composition is disclosed. The composition comprises a crosslinking agent, a hydroxyalkyl acrylate or methacrylate, and an acrylic polyol. The crosslinking agent is selected from the group consisting of multifunctional isocyanates, melamines, and silanes... | 06/14/2005 |
| 6884898 | Propylene oxide process Propylene oxide is formed by reaction of propylene with molecular oxygen in a high boiling solvent containing slurried solid catalyst, the light components are flashed and the remaining liquid containing slurried catalyst is recycled. ... | 04/26/2005 |
| 6872679 | Heterogeneous catalyst regeneration Used titanium-containing silicon oxide catalysts are regenerated by heating the used catalyst at a temperature of at least 400° C. in the presence of a oxygen-containing gas stream, followed by impregnation with a titanium source, and then calcining the impregnated... | 03/29/2005 |
| 6869988 | Solid supported comb-branched copolymers as an additive for gypsum compositions A gypsum composition suitable for use in the manufacture of gypsum products is provided. The gypsum composition includes gypsum, water, and a solid dispersant comprising a supported acrylic/polyether comb-branched copolymer. A method of making a gypsum composition i... | 03/22/2005 |
| 6870060 | Product recovery from supercritical mixtures Oxidation products are recovered from a mixture of the products in a dense phase or supercritical solvent by a liquid—liquid extraction at dense phase conditions. ... | 03/22/2005 |
| 6867312 | Propylene oxide process Propylene oxide is formed in a two step reaction wherein in a first step oxygen and hydrogen are reacted in the absence of propylene to form hydrogen peroxide and in a second step propylene is reacted with the formed hydrogen peroxide to form propylene oxide, the sa... | 03/15/2005 |
| 6815513 | Process for preparing comb-branched polymers A continuous process for making a comb-branched copolymer of an acrylic monomer and a polyether macromonomer is disclosed. The process is performed by continuously feeding a reaction zone with a monomer stream that contains an acrylic acid and a polyether macromonom... | 11/09/2004 |
| 6803491 | Preparation of lithium phosphate catalysts A new method for preparing lithium phosphate catalysts is disclosed. The method comprises precipitating a lithium phosphate from a mixture comprising a first aqueous solution which contains lithium and sodium ions and a second aqueous solution which contains phospha... | 10/12/2004 |
| 6780951 | Multifunctional allyl carbamates and coatings therefrom Allyl carbamates are disclosed. The allyl carbamates are prepared by reacting an isocyanate with an allylic alcohol or alkoxylated allylic alcohol. Suitable isocyanates are selected from hexamethylene diisocyanate (HDI), HDI biuret, dimer, HDI trimer, HDI allophanat... | 08/24/2004 |
| 6762262 | Preparation of acrylic polyols A method for making a low-yellowing acrylic polyol is disclosed. The acrylic polyol has an APHA color increase less than 100% when it is mixed with 1.5 wt % of an UV light stabilizer. The method comprises free radically copolymerizing an allylic alcohol, an alkyl ac... | 07/13/2004 |
| 6710192 | Dense phase epoxidation Propylene oxide is formed by reaction of hydrogen, oxygen, and propylene over a solid catalyst such as Pd on TS-1, the reaction being carried out in carbon dioxide solvent at conditions effective to provide a dense phase reaction mixture. ... | 03/23/2004 |
| 6696579 | Alkylene carbonate purification An alkylene carbonate such as propylene carbonate is contacted with an alumina or silica solid adsorbent having a surface area of 50-400 m2 /g such as basic alumina to remove impurities therefrom and improve color and color stability.... | 02/24/2004 |
| 6696593 | Preparation of UV-curable urethane compositions A method of preparing UV-curable urethane compositions is disclosed. The method comprises two steps. First, isophorone diisocyanate (IPDI) reacts with a hydroxy-functional resin to form an NCO prepolymer. Second, the NCO prepolymer reacts with a hydroxy-f... | 02/24/2004 |
| 6696521 | High performance ortho UPR A high performance UPR (unsaturated polyester resin) is disclosed. The UPR comprises recurring units of phthalic anhydride, 2-methyl-1,3-propanediol, and maleic anhydride. It has a fumarate/maleate ratio 85/15 or greater. It has a bi- or multi-modal molec... | 02/24/2004 |
| 6664360 | Preparation of water-reducing copolymers for concrete Alkoxylated acrylate and methacrylate macromonomers are disclosed that are useful in the preparation of water-reducing additives for concrete, ultraviolet light-curable adhesives, and water-dispersed polyurethanes. The macromonomers are suitably prepared ... | 12/16/2003 |
| 6660800 | Process for making crosslinked polyvinylpyrrolidone A process for making crosslinked polyvinylpyrrolidone (PVP-P) is disclosed. Crosslinker generation, followed by polymerization of NVP, gives a polymer containing up to 4 wt. % of residual NVP. An aqueous mixture of the polymer is then heated in the presen... | 12/09/2003 |
| 6586605 | Purification of alkylene carbonate The invention is a method to purify an alkylene carbonate such as propylene carbonate by contact with at least two solid adsorbents comprising carbon and an inorganic silicon or aluminum oxide. The purification method successfully improves color and color... | 07/01/2003 |
| 6583300 | Epoxidation system with fixed bed reactors A process for the production of an oxirane compound by reaction of an olefin with a hydroperoxide reactant in the presence of a solid epoxidation catalyst, wherein the olefin and hydroperoxide reactants are first reacted in it least two fixed bed reactors... | 06/24/2003 |
| 6555596 | Multifunctional allyl carbamates and coatings therefrom Allyl carbamates are disclosed. The allyl carbamates are prepared by reacting an isocyanate with an allylic alcohol or alkoxylated allylic alcohol. Suitable isocyanates are selected from hexamethylene diisocyanate (HDI), HDI biuret, dimer, HDI trimer, HDI... | 04/29/2003 |
| 6555623 | Preparation of unsaturated polyesters A process for making unsaturated polyesters from 2-methyl-1,3-propanediol (MPD) is disclosed. The process comprises reacting one equivalent of an aromatic diacid with about two equivalents of MPD to produce an ester diol and then reacting one equivalent o... | 04/29/2003 |
| 6527850 | Use of comb-branched copolymers in gypsum compositions A gypsum composition suitable for use in the manufacture of construction materials is provided. The gypsum composition includes gypsum, water, and a dispersant formulation comprising an acrylic/polyether comb-branched copolymer. A method of making a gypsu... | 03/04/2003 |
| 6512066 | Process for making crosslinked polyvinylpyrrolidone with low swell volume A two-step, base-catalyzed process for making crosslinked polyvinylpyrrolidone (PVP-P) having a low swell volume is disclosed. A crosslinker is generated "in situ" in the first step by heating a basic aqueous mixture containing a relatively low concentrat... | 01/28/2003 |
| 6512129 | Epoxidation process Insoluble resinous sodium materials are separated from a hydroperoxide/olefin epoxidation feed by contact with a fine screen or a bed of coalescing solids.... | 01/28/2003 |
| 6500311 | Propylene oxide purification A mixture of propylene oxide and methanol is separated by liquid/liquid extraction using water and a hydrocarbon such as n-octane as extractive solvents.... | 12/31/2002 |
| 6498259 | Direct epoxidation process using a mixed catalyst system The liquid-phase epoxidation reaction of an olefin with hydrogen and oxygen in the presence of a catalyst mixture containing a titanium zeolite and a supported catalyst surprisingly produces less ring-opened products such as glycols when performed in the ... | 12/24/2002 |
| 6478930 | Impurities separation by distillation A distillation procedure is provided for the separation of impurities from organic materials such as glycols and glycol ethers whereby a liquid stripping component is interfaced into a distillation column with or below the organic material introduction, h... | 11/12/2002 |
| 6468496 | Process for producing hydrogen peroxide A supported gold-containing catalyst is effective for producing hydrogen peroxide from the direct liquid-phase reaction of hydrogen and oxygen.... | 10/22/2002 |
| 6462117 | Coatings and inks based on solvents having negligible photochemical reactivity Coating and ink compositions based on organic solvents that have negligible photochemical reactivity and methods for making them are disclosed. The organic solvents have calculated oxidation rate constants of less than about 1×1010 cm3 | 10/08/2002 |
| 6455657 | Preparation of vinyl aromatic-allylic alcohol copolymers A process for preparing vinyl aromatic-allylic alcohol copolymers, such as styrene-allyl alcohol (SAA) copolymers, is disclosed. The process is conducted in the presence of a solvent, which enables the preparation of copolymers having both low hydroxyl fu... | 09/24/2002 |
| 6441204 | Direct epoxidation process using a mixed catalyst system The invention is a liquid-phase process for epoxidizing an olefin with hydrogen and oxygen in the presence of a catalyst mixture comprising a titanium zeolite and a supported catalyst comprising palladium on niobium-containing support. The process is high... | 08/27/2002 |
| 6441203 | Direct epoxidation process using a palladium on niobium-containing support The invention is a liquid-phase process for epoxidizing an olefin with hydrogen and oxygen in the presence of a supported catalyst comprising palladium on niobium-containing support. The process exhibits good productivity and selectivity for olefin epoxid... | 08/27/2002 |
| 6426437 | Hydroformylation process A process for the production of 1,4-butanediol is described. The process comprises hydroformylating allyl alcohol in the presence of a solvent and a catalyst system comprising a rhodium complex, a ruthenium complex and a diphosphine ligand and hydrogenati... | 07/30/2002 |
| 6417412 | Purification of tertiary butyl alcohol The present invention relates to purification of a tertiary butyl alcohol process stream by contact in the liquid phase with a large pore zeolite such as 13X in the sodium form.... | 07/09/2002 |
| 6417378 | Direct epoxidation process using pre-treated titanium zeolite The invention is a process for epoxidizing an olefin with hydrogen and oxygen in the presence of a catalyst comprising a noble metal and pretreated titanium zeolite. Titanium zeolite pretreatment comprises contacting the titanium zeolite with a leaching a... | 07/09/2002 |
| 6414085 | Polyester resins based on terephthalic acid and 2-methyl-1,3-propanediol and processes for the preparation thereof Unsaturated terephthalate-based polyester resins (UPR) based on 2-methyl-1,3-propanediol, a saturated dicarboxylic acid or derivative thereof, and an unsaturated dicarboxylic acid or derivative thereof be prepared without use of a catalyst in reasonable c... | 07/02/2002 |
