Did You Know...
...that Thomas Edison's patent application on his phonograph was approved by the Patent Office in just seven weeks? In contrast, it took Gordon Gould, the inventor of the laser, 30 years to obtain his patent -- finally awarded in 1988!
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| Number | Title | Issue Date |
| 7439300 | Polyvinyl alcohol based polymer and method of manufacturing the same The present invention provides polyvinyl alcohol based (PVA) whose solubility in water varies with a small temperature change to a sufficiently great degree. In manufacturing a polyvinyl alcohol based polymer by: progressing a transesterification reaction of a polyv... | 10/21/2008 |
| 7368061 | Process and device for the production of elastomer-modified thermoplastics A continuous process for the production of an elastomer-modified thermoplastic is disclosed. The process entails (i) obtaining graft elastomer (D) having residual moisture content of 1 to 50 wt. %, particularly 5 to 50 wt. %, particularly preferably 10 to 40 wt. %, ... | 05/06/2008 |
| 7351765 | Method for producing polyvinylacetals Polyvinyl acetals are obtained in a cost-effective and environmentally advantageous manner by employing as at least a portion of the aqueous acetalization medium, the mother liquor from a previous acetalization reaction. ... | 04/01/2008 |
| 7348128 | Photosensitive resin based on saponified polyvinyl acetate photosensitive resin composition, method of forming aqueous gel from the same, and compound A photosensitive resin which exhibits excellent storage stability, affinity, miscibility, or solubility with respect to a variety of compounds, and high sensitivity can be solidified even under hydrous conditions as well as exhibiting high cure-related sensitivity a... | 03/25/2008 |
| 7312275 | Cross-linked polyvinyl acetals The invention relates to a cross-linked polyvinyl acetal which is characterized in that it can be obtained from at least one polyvinylacetal (1) which is obtained by reacting at least one polymer (A), which contains a) 1,0 to 99.9 wt. % structural units of formula (... | 12/25/2007 |
| 7148288 | Process for formation of preformed stabilizer polyols A process is disclosed for formation of a preformed stabilizer for use in formation of graft polyols. The preformed stabilizer has a reduced level of transesterification products and results in less reactor fouling. The preformed stabilizer is prepared in the presen... | 12/12/2006 |
| 7056971 | Essentially gas-impermeable thermoplastic elastomer A thermoplastic elastomer (“TPE”) which is oxygen-permeable is provided with excellent barrier properties against oxygen by melt-blending with a liquid polyisobutene oil plasticizer in an amount insufficient to render the plasticized elastomer tacky. If made tac... | 06/06/2006 |
| 7041731 | Method for producing saponified ethylene-vinyl acetate copolymer This invention provides a method for producing a saponified ethylene-vinyl acetate copolymer in which visible imperfections (particularly fish eyes) of the saponified copolymer is inhibited. In this invention, a mixture solution is prepared by adding water to a meth... | 05/09/2006 |
| 7005168 | Starch-loaded polyvinyl alcohol copolymer film for packaging non-liquid product and method for making the same A water-soluble film for packaging a non-liquid product, a package employing the film, and methods of making the same, are disclosed. The film is made from a hydrolyzed copolymer of vinyl acetate and methyl acrylate in a range of from about 30 to about 95 percent by... | 02/28/2006 |
| 6962955 | Vinyl alcohol polymer and process for producing vinyl alcohol polymer A polyvinyl alcohol having hydrolyzed silyl group functionalized monomer units. The polyvinyl alcohol satisfies the following formulae (I) and (II) and the pH of an aqueous 4% solution of the polyvinyl alcohol is between 4 and 8: 20 | 11/08/2005 |
| 6958372 | Magnetic, silanised polyvinylalcohol-based carrier materials The present invention relates to magnetic, polymeric polyvinylalcohol-based carrier materials. The surface of said materials is at least partially silanised. The invention also relates to a method for silanising the surface of such materials and to the use of the ma... | 10/25/2005 |
| 6903159 | Method for producing saponified ethylene-vinyl acetate copolymer A method for producing a saponified ethylene-vinyl acetate copolymer which comprises saponifying an ethylene-vinyl acetate copolymer in an alcohol-based solvent with an alkali catalyst, wherein an amount between 100 ppm and 15,000 ppm of water with respect to the et... | 06/07/2005 |
| 6803411 | Polyvinyl alcohol polymer film, method of producing the same and polarization film Difference in retardation between two points separated by 1 cm along the TD direction of a polyvinyl alcohol polymer film 6 is 5 nm or less. The length of a surface for drying a polyvinyl alcohol polymer film 6 is 3 m to 200 m, and the water content of... | 10/12/2004 |
| 6800687 | Method and apparatus for producing ethylene-vinyl acetate copolymer saponification product A method for producing a saponified ethylene-vinyl acetate copolymer (EVOH) comprises: supplying into a second reactor a solution containing the copolymer that is saponified partially with an alkali catalyst under a predetermined pressure in a first reactor; and sap... | 10/05/2004 |
| 6780932 | Graft polyols prepared by a continuous process Disclosed is a process for preparation of final graft polyols via a continuous process. In, addition, a final graft polyol formed by the process is disclosed. The process includes the steps of reacting a plurality of ethylenically unsaturated monomers and a reaction... | 08/24/2004 |
| 6756442 | Silane-modified polyvinyl acetals The invention relates to silane-modified polyvinyl acetals obtained by acetalizing partially hydrolyzed or fully hydrolyzed vinyl ester polymers having at least 50 mol % of vinyl alcohol units with one or more aldehydes, optionally in the form of their hemiacetals o... | 06/29/2004 |
| 6743859 | Polyvinyl alcohol polymer production method and polyvinyl alcohol polymer A method of producing polyvinyl alcohol polymer, with which a high-strength polyvinyl alcohol polymer with a high degree of saponification can be obtained, the polyvinyl ester saponification process can be linked directly with the spinning process, in which the poly... | 06/01/2004 |
| 6686405 | Process for producing ethylene-vinyl alcohol copolymer resin, process for producing pellets and resin pellets A process for producing an ethylene-vinyl alcohol copolymer resin, including feeding EVOH into an extruder, keeping the temperature of the melting resin in the extruder at 70 to 170° C., adjusting the amount of water in the extruder so that the water con... | 02/03/2004 |
| 6680354 | High concentration agitation of PVA polymer powders The present invention is a process for preparing high concentration polyvinyl alcohol (PVA) aqueous mixtures, wherein the PVA solid concentration is at least 14% in the mixture.... | 01/20/2004 |
| 6653400 | Method for producing saponified ethylene-vinyl acetate copolymer This invention provides a method for producing a saponified ethylene-vinyl acetate copolymer in which visible imperfections (particularly fish eyes) of the saponified copolymer is inhibited. In this invention, a mixture solution is prepared by adding wate... | 11/25/2003 |
| 6632878 | Production process for polymers with hydroxyl groups and polymers obtained by the process A hydroxyl group containing polymer is prepared by a process, comprising: contacting the polymer having a substituent with high temperature, high pressure water, thereby converting the substituent to hydroxyl groups.... | 10/14/2003 |
| 6596807 | Process for producing vinyl alcohol polymer compositions A vinyl alcohol polymer composition (II) is produced by a process of providing a reaction liquid comprising a solution containing a vinyl carboxylate polymer and, a first metal alkoxide (I) having at least one functional group and/or an oligomer (I) havin... | 07/22/2003 |
| 6566549 | Continuous polymerization process and products therefrom A continuous process for oligomers which do not contain, as polymerized units, carboxylic acid-containing monomers and their salts, including the steps of: (1) forming a reaction mixture, substantially free of carboxylic acid-containing monomers and their... | 05/20/2003 |
| 6552123 | Thermoplastic polyvinyl alcohol fibers and method for producing them Provided are melt-spun fibers comprising, as at least one component, a water-soluble polyvinyl alcohol, and a method for producing fibrous structures comprising the fibers. The thermoplastic polyvinyl alcohol fibers comprise, as at least one component, a ... | 04/22/2003 |
| 6203903 | Unmodified polyvinyl alcohol fibers This invention relates, in general, to thermoplastic film and fiber structures and methods of making the same. More specifically, this invention relates to substantially water-free films and fibers comprising unmodified polyvinyl alcohol.... | 03/20/2001 |
| 6197238 | Methods for making unmodified polyvinyl alcohol fibers This invention relates, in general, to thermoplastic film and fiber structures and methods of making the same. More specifically, this invention relates to substantially water-free films and fibers comprising unmodified polyvinyl alcohol.... | 03/06/2001 |
| 6191193 | Microspheric embolic materials having a dual structure of poly(vinyl acetate) core and poly(vinyl alcohol) shell and method for preparing the same A method for separating poly(vinyl acetate) particles having various particle sizes, which have been prepared by suspension polymerization of vinyl acetate monomers, into respective microspheric poly(vinyl acetate) particles with uniform particle size dis... | 02/20/2001 |
| 6156244 | Storage-stable hydrogels The present invention relates to a process for the preparation of storage-stable hydrogel mouldings, the storage stability of which can be established by controlled hydrolysis. At the same time as the sotrage stability is established, the hydrogel is ster... | 12/05/2000 |
| 6054530 | Continuous process for the preparation of poly(vinyl acetate) for poly(vinyl alcohol) production An improved process for the continuous production of poly(vinyl alcohol) which involves purifying poly(vinyl acetate) paste exiting from a polymerization reactor and dissolving the substantially pure poly(vinyl acetate) in a hydrolytic alcohol-containing ... | 04/25/2000 |
| 6046272 | Non yellowing, thermally stable polyvinyl alcohol A process for making a thermally stable and substantially low yellow polyvinyl alcohol, and a process for reversing discoloration of polyvinyl alcohol. The process consists of treating polyvinyl acetate before saponification or treating polyvinyl alcohol ... | 04/04/2000 |
| 6020425 | Unmodified polyvinyl alcohol films and fibers and methods of making the same This invention relates, in general, to thermoplastic film and fiber structures and methods of making the same. More specifically, this invention relates to substantially water-free films and fibers comprising unmodified polyvinyl alcohol.... | 02/01/2000 |
| 5955538 | Process for the manufacture of ethylene/vinyl acetate/vinyl alcohol terpolymer A process for the manufacture of ethylene/vinyl acetate/vinyl alcohol terpolyrners of improved color. The process comprises reacting ethylene/vinyl acetate copolymer with a hydroxyl-containing compound in the presence of a catalyst. The hydroxyl-containin... | 09/21/1999 |
| 5914369 | Process for the preparation of polyvinyl alcohol The reaction of polyvinyl acetate in methanolic solution with methanolic sodium hydroxide at a temperature between 10° C. and 65° C. with stirring at a stirring speed of from 5 to 200 rpm with a stirrer which has a ratio of stirrer diameter (d) to conta... | 06/22/1999 |
| 5849810 | Photocrosslinked polymers The invention relates to a novel process for the manufacture of mouldings, especially contact lenses, in which a soluble prepolymer comprising crosslinkable groups is crosslinked in solution, and also to mouldings, especially contact lenses, obtainable in... | 12/15/1998 |
| 5811488 | Polyvinyl alcohol powder The present invention provides a polyvinyl alcohol powder which comprises a pore having an average diameter of 0.1 to 10 μm in the range of 0.05 to 0.4 cc/g. Since the PVA powder of the present invention has an excellent solubility in water, an aqueous s... | 09/22/1998 |
| 5753753 | Hydrolysis of polyvinyl aklaenoates This invention relates to an improved process for producing a vinyl alcohol containing polymer having a narrow particle size without substantial reactor fouling. The process for producing the vinyl alcohol containing polymer involves hydrolyzing a vinyl e... | 05/19/1998 |
| 5744547 | Processes for producing vinyl acetate polymer and saponified product of vinyl acetate polymer and resin composition A process for producing vinyl acetate polymers comprises, after polymerization of at least one monomer comprising vinyl acetate, adding a conjugated polyene having a boiling point of at least 20° C. Saponified products of the vinyl acetate polymers obtai... | 04/28/1998 |
| 5710211 | Process for producing vinyl alcohol polymer According to the present invention, there are provided a process for producing a vinyl alcohol polymer comprising reaction of a vinyl ester polymer (A) having an epoxy group with a compound (B) having a thiol or thioester group and hydrolysis thereof, sai... | 01/20/1998 |
| 5661217 | Method of manufacturing monolithic structures from polyvinyl alcohol A method of forming a useful molded part or film of polyvinyl alcohol. The polyvinyl alcohol, together with a plasticizer is injection or blow molded to form the useful molded part or melt processed (blown or cast extrusion) to form the film wherein upon ... | 08/26/1997 |
| 5612412 | Lactone-modified polyvinyl alcohol, a process for the preparation thereof Disclosed are a lactone-modified polyvinyl alcohol and a process for the preparation thereof, a polymer composition, a permanently anti-electrostatic resin composition, a lactone-modified resin having hydroxyl groups, and a process for the preparation the... | 03/18/1997 |
