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Felix Hoffmann, a German chemist, was searching for something to relieve his father's arthritis. In doing so, he "rediscovered" acetylsalicylic acid and in 1900, patented a stable process for developing it. Hence, we have aspirin.
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| Number | Title | Issue Date |
| 6613861 | POLYADDITION PRODUCTS CONTAINING HYDROXYL AND URETDIONE GROUPS, PROCESS FOR THEIR PREPARATION, THEIR USE FOR THE PRODUCTION OF HIGHLY REACTIVE POLYURETHANE POWDER COATINGS WHICH ARE FREE FROM ELIMINATION PRODUCTS, AND THE POLYURETHANE POWDER COATINGS PRODUCED ACCORDINGLY Polyaddition products containing hydroxyl and uretdione groups, a process for their preparation, their use for the production of highly reactive polyurethane (PUR) powder coatings which are free from elimination products and which crosslink to give light-... | 09/02/2003 |
| 6437074 | Blocked polyisocyanates, a process for their preparation, and their use Partially or totally blocked polyisocyanates comprising physical mixtures of individual a) urethane-functional and/or b) biuret-functional and/or c) isocyanurate-functional aliphatic and (cyclo)aliphatic and/or cycloaliphatic diisocyanate whose isocyanate grou... | 08/20/2002 |
| 6368587 | Bioactive surface coating using macroinitiators A process for the bioactive coating of the surface of substrates, which entails graft polymerizing at least one vinyl monomer of the formula (I): R--(A)a (I) in which R is an olefinically unsaturated organic radical, having the valence a, A is a ca... | 04/09/2002 |
| 6262298 | Process for the C-alkylation of malonic esters using phase-transfer agents The invention relates to a process for the C-alkylation of dialkyl malonates, in which a dialkyl malonate is reacted with an alkyl halide in the presence of potassium carbonate as a hydrogen halide acceptor in an inert solvent, and a phase-transfer cataly... | 07/17/2001 |
| 6255516 | Process for preparing fluoroalkyl-containing organosilicon compounds, and their use Fluoroalkyl organosilicon compounds are prepared by reacting fluoroolefins with organosilicon compounds that contain at least one H-Si group, in the presence of a Pt(0) complex catalyst. Further, fluoroalkylalkoxy organosilicon compounds are prepared by e... | 07/03/2001 |
| 6255513 | Stable compositions of water-soluble amino-and alkenyl-functional organosiloxanes, process for their preparation and their use The present invention relates to a stable composition of water-soluble organosiloxanes obtained by reacting a) a water-soluble amino-functional alkoxysilane with at least one water-insoluble alkenyl-functional alkoxysilane b) by adding water to form a mixture,... | 07/03/2001 |
| 6248917 | Process for the preparation of 2-hydroxybenzonitrile 2-Hydroxybenzonitrile is prepared by passing 2-hydroxybenzamide in the gas phase over a heterogeneous catalyst thereby effecting dehydration of the 2-hydroxybenzamide to produce 2-hydroxybenzonitrile.... | 06/19/2001 |
| 6248811 | Bioactive surface coating A process is disclosed for preparing bioactive, covalently fixed coatings on the surfaces of substrates, by grafting to a surface of the substrate a coating polymer which contains the following monomers in copolymerized form: (i) at least one monomer of t... | 06/19/2001 |
| 6245281 | Use of a nylon-12 for selective laser sintering A process for producing shaped articles are prepared by a process comprising selectively laser sintering a nylon-12 pulverulent material having the following characteristics:... | 06/12/2001 |
| 6242630 | Process for the continuous preparation of 3-halopropylorganosilanes A process for the continuous preparation of 3-halopropylorganosilanes of the general structure where: R is CH3, C2 H5, C3 H7, OCH3, OC2 H5 or OC3 H7, ... | 06/05/2001 |
| 6243616 | Method and device for producing three-dimensional objects Method and device for producing three-dimensional objects in layers, comprising treating pulverulent, in particular, polymer, substrates or polymerizable monomers by means of microwave radiation.... | 06/05/2001 |
| 6239194 | Surface-modified fillers, process for their preparation and their use The present invention relates to surface-modified fillers obtained by mixing a filler with water, adding an water-based organosiloxane composition with very thorough mixing, wherein the organosiloxanes are soluble in water and contain, in addition to OH g... | 05/29/2001 |
| 6235848 | Crosslinkable molding material A crosslinkable molding material is provided that includes: (a) 3 to 98 parts by weight of one or more thermoplastics and (b) 2 to 97 parts by weight of a substantially amorphous poly--olefin which is grafted with a silane which has at least one olefini... | 05/22/2001 |
| 6228936 | Fluoroalkyl-functional organopolysiloxane-containing compositions The present invention provides an aqueous alcoholic fluoroalkyl functional group containing organopolysiloxane composition, which includes organopolysiloxanes of formula I: RO{Si(A)(CH3)z (OR)1-z O}a {Si(B)(R2 | 05/08/2001 |
| 6218567 | Process for preparing hydroxybenzoic esters of oxo alcohols A process for preparing hydroxybenzoic esters of oxo alcohols, which comprises: esterifying a hydroxybenzoic acid with an oxo alcohol in the reaction mixture from the hydroformylation of olefins, which reaction medium contains various materials which are ... | 04/17/2001 |
| 6218492 | Water insoluble bacteriophobic polymers containing carboxyl and sulfonic acid groups The invention relates to water-insoluble, bacteriophobic and optionally cell proliferation-inhibiting polymers obtainable by free-radical polymerization of (a) at least one monomer of the general formula R--(A)a, in which R is an aliphatically ... | 04/17/2001 |
| 6218477 | Aqueous binders based on polybutadiene A water-soluble or water-dispersible binder based on polybutadienes which is modified with at least 5% by weight of maleic anhydride and wherein at least 30% of the anhydride groups are present as imide groups from reaction with an amino carboxylic acid.... | 04/17/2001 |
| 6207289 | Thermoplastic compound for filling pores in wooden materials A thermoplastic compound useful in filling pores and voids in wooden materials, particularly edge regions, wherein the thermoplastic compound comprises a blend of two copolyesters and optionally fillers, wherein the first copolyester has a melting point o... | 03/27/2001 |
| 6204351 | Blocked polyisocyanates with built-in hals stabilizer Partially or completely blocked polyisocyanates having an built-in HALS stabilizer.... | 03/20/2001 |
| 6203856 | Process for the preparation of antimicrobial plastics Antimicrobial activity is imparted to the surface(s) of an apparatus or article by a method, comprising: copolymerizing tertbutylaminoethyl methacrylate with at least one other aliphatically unsaturated monomer in the presence of said apparatus or article... | 03/20/2001 |
| 6201093 | Amino-functional polyorganosiloxanes, their production and use Water-soluble, i.e. easily dispersible, amino-functional polyorganosiloxanes obtained by radical polymerization of vinyl compounds containing amino or ammonium groups onto polyorganosiloxanes which contain at least one mercapto group. They are suitable as... | 03/13/2001 |
| 6180817 | Process for the distillation of crude ester in the DMT/PTA process A process for preparing crude dimethyl terephthalate, comprises oxidizing a mixture comprising para-xylene and methyl para-toluate, esterifying the oxidized mixture with methanol, separating the resulting crude ester into fractions. By separating the crud... | 01/30/2001 |
| 6177582 | Fluoroalkyl-functional organosiloxane-containing compositions based on alcohol, a process for their preparation and their use An alcoholic fluoroalkyl-functional group containing organosiloxane based composition is prepared by the controlled hydrolysis of at least one fluoroalkyl-functional group containing organosilane of formula I: R1 --Y--(CH2)2 Si... | 01/23/2001 |
| 6166164 | Blocked polyisocyanates, a process for their preparation, and their use Partially or totally blocked polyisocyanates comprising physical mixtures of individual a) urethane-functional and/or b) biuret-functional and/or c) isocyanurate-functional aliphatic and (cyclo)aliphatic and/or cycloaliphatic diisocyanate whose isocyanate grou... | 12/26/2000 |
| 6166247 | Method for preparing cyclopropanecarboxylic acids The invention relates to a novel method for preparing cyclopropanecarboxylic acids by acidolysis of the corresponding esters, using an alkylbenzenesulfonic acid represented by the formula: ##STR1## as the reaction catalyst, where m+n is 5 to 15. Proc... | 12/26/2000 |
| 6162385 | Composite comprising a polyamide-based molding composition and vulcanized fluoroelastomers Composite comprising a polyamide-based molding composition and vulcanized fluoroelastomers. Composite articles comprising at least two subcomponents which are firmly joined to one another which comprise i) a vulcanizate and ii) a polyamide containing ther... | 12/19/2000 |
| 6161879 | Two-component connector A connector for connecting an assembly to a pipe, which is highly leakproof with respect to the medium to be transported and is secure against separation under axial load. The connector comprises two materials A and B which swell to different degrees. A p... | 12/19/2000 |
| 6160075 | Two-component (PU) polyurethane coating composition with high environmental and mechanical resistance A two-component polyurethane coating composition essentially comprising (A) a polyols component, (B) a polyisocyanate component, wherein the polyisocyanate component (B) comprises at least 30% by weight of a polyisocyanate based on 2-methylpentane-1,5-dii... | 12/12/2000 |
| 6156214 | Process for removing mercury from alkali metal alkoxide solutions A three-stage process for removing mercury contaminants from alcoholic alkali metal alkoxide solutions is provided, in which mercury is depleted in a first filtration through inert fibrous material, followed by a second filtration through pulverized coal,... | 12/05/2000 |
| 6156863 | Urea- and uretdione-functional polyisocyanates A urea- and uretdione-functional polyaddition compound having free, partially or totally blocked isocyanate groups and having the following structure: ##STR1## wherein the substituents are defined as follows: ##STR2## n: 1-20; R1... | 12/05/2000 |
| 6150569 | Process for preparing lower and higher alkali metal alkoxides, in particular potassium tert-butoxide, by microheterogeneous catalysis A process for preparing an alkali metal alkoxides by reacting an alkali metal amalgams and alcohols in the presence of a catalysts comprising a transition metal carbide, nitride or carbonitride, where the catalyst is in the form of a powder.... | 11/21/2000 |
| 6149836 | Liquid solutions of dicarboxylic acids Liquid melts of dicarboxylic acid have a tendency to undergo unwanted discoloration on prolonged storage. By means of a solution of the dicarboxylic acids in a lactam of an aliphatic ,ω-aminocarboxylic acid, the discoloration can be avoided.... | 11/21/2000 |
| 6150550 | Process for preparing alkoxysilanes A process for preparing alkoxysilanes by reacting alcohols with halosilanes which are dissolved in a nonpolar solvent that is immiscible with the alcohol.... | 11/21/2000 |
| 6147239 | Process for preparing n, n'-disubstituted p-quinonediimines, their use and organosilanes containing methacryloxy or acryloxy groups, processes for their stabilization and their preparation The invention relates to a process for preparing N,N'-disubstituted p-quinonediimines of general formula I ##STR1## wherein a corresponding N,N'-disubstituted p-phenylenediamine is oxidized in alkaline/alcoholic solution, and also their use. The inve... | 11/14/2000 |
| 6143841 | Coatings based on thermoplastic polyesters with addition of an unsaturated polyester as additive resin A coating formulation comprises (A) a base polyester consisting of the copolymerization product of at least one aliphatic, cycloaliphatic and/or aromatic polybasic acid and/or anhydride thereof or at least one hydroxycarboxylic acid or derivative thereof ... | 11/07/2000 |
| 6143920 | Process for the preparation of methoxyacetic acid esters The invention relates to a process for the preparation of methoxyacetic acid esters in which a chloroacetic acid ester is reacted with an alkali metal methoxide to give the methoxyacetic acid ester.... | 11/07/2000 |
| 6140514 | Process for the preparation of macrocyclic esters or lactones A process for the preparation of macrocyclic esters or lactones in a two-stage reaction, which entails effecting linear oligomerization of monomers having a number of carbon atoms corresponding to the macrocycle and effecting cyclizing deoligomerization, ... | 10/31/2000 |
| 6136871 | Process for the preparation of polyolefinic particle foam Polyolefinic particle foams containing additives may be produced by a process, which comprises (a) initially charging a pressure-resistant reactor with a dispersion consisting essentially of polyolefin particles and a liquid dispersion medium, and also a ... | 10/24/2000 |
| 6131618 | Process for thermoforming pipes by means of an HF field A thermoforming process for forming a plastic pipe using a high-frequency field to introduce the required heat. The pipes thermoformed according to the invention are used, for example, in the motor vehicle sector.... | 10/17/2000 |
| 6121466 | Process for the preparation of macrocyclic esters The invention relates to a process for the preparation of a macrocyclic ester of the general formula: in which m is an integer from 6 to 14 and n is an integer from 2 to 12.... | 09/19/2000 |
