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| Number | Title | Issue Date |
| 8158818 | Process for preparing isocyanatoorganosilanes Isocyanate-functional silanes, particularly isocyanate-functional α-silanes, are prepared in good yield by a liquid phase thermolysis conducted in the presence of a catalyst at a pressure of >100 mbar, or >80 mbar when a thin-film evaporator is used. ... | 04/17/2012 |
| 8053595 | Process for producing isocyanates An object of the present invention is to provide a process that enables isocyanates to be stably produced over a long period of time at high yield without encountering various problems as found in the prior art when producing isocyanates without using phosgene. The ... | 11/08/2011 |
| 7361723 | Low-viscosity allophanates containing actinically curable groups A process for preparing binders containing allophanate groups which contain, at the oxygen atom of the allophanate group that is bonded via two single bonds, organic radicals with activated groups capable of participating in a polymerization reaction with ethylenica... | 04/22/2008 |
| 7339074 | Multistage continuous preparation of cycloaliphatic diisocyanates The invention relates to a multistage process for continuous and phosgene-free preparation of cycloaliphatic diisocyanates. ... | 03/04/2008 |
| 7329776 | Multistage continuous preparation of cycloaliphatic diisocyanates A multistage process for continuous and phosgene-free preparation of cycloaliphatic diisocyanates. ... | 02/12/2008 |
| 7323532 | Low-viscosity radiation-curing and thermally curing polyisocyanates The present invention concerns a process for producing low-viscosity polyisocyanates or secondary products thereof, which carry activated, radiation-curable double bonds and can optionally also cure thermally, and low-viscosity polyisocyanate mixtures or secondary p... | 01/29/2008 |
| 7282119 | Process and apparatus for the isolation of pure, or substantially pure, organometallic compounds A process and apparatus to enable the continuous isolation of an organometallic compound, such as trimethylindium from a liquid feedstock. The liquid feedstock is delivered to a distillation column having two heating zones to effect dissociation of the feed stock th... | 10/16/2007 |
| 7179935 | Method for producing isocyanates A process for the preparation of isocyanates from carbamic esters. ... | 02/20/2007 |
| 7122697 | Method for producing carbamates and method for producing isocyanates A method for producing carbamates that enables carbamates to be produced at low costs, with high selectivity and high yield, and in a simple manner, and a method for producing isocyanates that enables isocyanates industrially used to be produced by using the carbama... | 10/17/2006 |
| 7038003 | Polyether allophanates stable towards discolouration A process for preparing polyisocyanate prepolymers containing allophanate structural units that includes reacting a) one or more polyisocyanates with b) one or more polyetherpolyols containing less than or equal to... | 05/02/2006 |
| 7030052 | Process for hydrogenating an aromatic amine in the presence of a supported ruthenium catalyst The invention relates to a process for hydrogenating an aromatic amine that has at least one amino group bound to an aromatic nucleus with hydrogen in the presence of a supported catalyst that contains at least ruthenium as active metal. The catalyst support has a B... | 04/18/2006 |
| 6992214 | Integrated process for the preparation of aromatic isocyanates and procedures for effecting the relative intermediate phases Integrated process for the preparation of aromatic isocyanates comprising: the reaction between an aromatic amine and an organiccarbonate in the presence of a catalyst selected from organic and inorganic salts of a metal selected from Zn, Sn, Pb, Cu; the removal of ... | 01/31/2006 |
| 6781010 | Non-phosgene route to the manufacture of organic isocyanates A phosgene-free process for producing organic isocyanates reacts an organic fomamide with a diorganocarbonate and thermolyzing the reaction product to obtain the corresponding organic isocyanate. Byproducts may be cycled back to the reaction or recycled to produce a... | 08/24/2004 |
| 6639101 | Isocyanate production procedure The procedure consists of the catalytic thermal decomposition of a carbamate in the presence of natural or synthetic carbamates as catalysts. Isocyanates with high yields and high reaction speeds are formed selectively.... | 10/28/2003 |
| 6251625 | Process for preparing peptides and N-carbamoyl-protected peptides The invention concerns a process for the enzymatic preparation of protected di- and oligopeptides and the separation of the protective groups used. The process according to the invention enables peptides to be synthesized simply and economically and the p... | 06/26/2001 |
| 5990345 | Process for preparation of ethylenically unsaturated isocyanates A process for the preparation of ethylenically unsaturated isocyanates is described, which process comprises silylating an appropriate ethylenically unsaturated urethane precursor at the urethane nitrogen and converting the resulting unsaturated N-silyl-u... | 11/23/1999 |
| 5951911 | Low viscosity ethylenically unsaturated polyurethanes containing allophanate groups The present invention relates to ethylenically unsaturated polyurethanes which are substantially free from isocyanate groups and have a) a content of ଲ,γ-ethylenically unsaturated ether groups (calculated as C.dbd.C, MW 24) incorporated through allophan... | 09/14/1999 |
| 5914428 | Process for preparation of isocyanate compounds An aliphatic diisocyanate compound is prepared in a high yield by reacting dimethyl carbonate with an aliphatic diamine in the presence of an alkali catalyst to produce a corresponding urethane compound; and, within 48 hours after the completion of the pr... | 06/22/1999 |
| 5906998 | Method for decomposing polymer containing urethane linkage and/or urealinkage In the decomposition of a polymer containing a urethane linkage and/or urea linkage in the presence of a decomposing agent, the amount of evolved carbon dioxide is measured and the decomposition reaction is conducted until a total amount of evolved carbon... | 05/25/1999 |
| 5883291 | Heat exchange media for the thermal cracking of carbamic acid esters Inert, thermally stable high-boiling solvents which have a defined boiling point or which boil over a narrow range are used as heat exchange media during thermal cracking of carbamic acid esters (urethane cracking).... | 03/16/1999 |
| 5789614 | Process for preparation of aliphatic diisocyanate compounds An aliphatic diisocyante compound is prepared in a high yield by reacting dimethyl carbonate with an aliphatic diamine in the presence of an alkali catalyst to produce a corresponding urethene compound; and, within 48 hours after the completion of the pre... | 08/04/1998 |
| 5773643 | Process for preparation of isocyanate compounds A diisocyanate compound substantially free from chlorine is prepared by the following consecutive steps (1), (2) and (3): (1) preparing dimethyl carbonate by a method selected from: (a) a method wherein carbon monoxide and oxygen are reacted with methanol, (b) a me... | 06/30/1998 |
| 5731458 | Process for thermally cracking carbamic acid esters This present invention relates to a process for thermally cracking carbamic acid esters into the corresponding isocyanate and hydroxyl compounds in the liquid phase, wherein the reaction proceeds as a reactive rectification in the stripping zone of a colu... | 03/24/1998 |
| 5672736 | Polyisocyanates containing allophanate groups The present invention relates to a process for preparing polyisocyanates containing allophanate groups by reacting compounds a), which i) contain urethane groups, but which are substantially free of hydroxyl groups and isocyanate groups, ii) have an average of... | 09/30/1997 |
| 5654474 | Aromatic diisocyanate and method of producing the same Novel aromatic diisocyanate and a method of producing the same. The method comprises reacting a diamine compound with a chloroformate to produce an urethane intermediate, and then reacting the urethane intermediate with a halogenated organosilicon compoun... | 08/05/1997 |
| 5648445 | Liquid 1,3-phenylene diisocyanate, 1,1'-biphenyl diisocyanate and 1,1'-oxy-bis-(isocyanato-benzene) Allophanate-modified 1,3-phenylene diisocyanates or 1,1-biphenyl diisocyanates or 1,1'-oxy-bis-(isocyanato benzenes) which are storage stable liquid at 25° C. are made by reacting the diisocyanate and a mono-alcohol to form an isocyanate containing ureth... | 07/15/1997 |
| 5646328 | Process for removing by-products from diurethanes Low-boiling by-products are removed from diurethanes prepared by a phosgene-free process by carrier vapor distillation using alcohol vapor, preferably the vapor of the basic alcohol found in the diurethane, as the carrier vapor. The diurethanes freed of l... | 07/08/1997 |
| 5633336 | Polyamines containing urea groups and process for their preparation Low-viscosity (cyclo)-aliphatic polyamines containing urea groups and having more than two amino groups may be prepared by reacting (cyclo)aliphatic diamines with polyisocyanates containing isocyanurate groups or biuret groups. Such polyamines are useful ... | 05/27/1997 |
| 5616784 | Thermal cleavage of carbamic esters In a reactor for the thermal cleavage of mono- and polyfunctional carbamic esters into the corresponding isocyanates and the hydroxyl component in the liquid phase, the geometry of the reactor, defined by the degassing area in relation to the volume and t... | 04/01/1997 |
| 5502244 | Process for producing isocyanates Provided is a process for producing isocyanates from carbamic acid esters which comprises thermally decomposing carbamic acid esters in the presence of a catalyst containing at least one compound selected from the group consisting of organic sulfonic acid... | 03/26/1996 |
| 5457229 | Process for preparing isocyanates from urethanes by a novel technique Urethanes are converted to isocyanates by reaction with a chloro-, bromo- or iodo-borane compound and a tertiary amine in a nonpolar solvent. With the preferred borane compound, chlorocatecholborane, the reaction goes speedily and under gentle conditions ... | 10/10/1995 |
| 5453536 | Polycarbamates, process for preparing polycarbamates, and process for preparing polyisocyanates Polycarbamates of a polyisocyanate and secondary alcohols are disclosed. These carbamates are characterized in being readily pyrolyzed to form the corresponding polyisocyanate and alcohol with low formation of tars and other by-products. Thus, these polyc... | 09/26/1995 |
| 5451697 | Process for preparing isocyanates A process for preparing isocyanates comprising contacting carbon dioxide and a primary amine in the presence of an aprotic organic solvent and a base selected from the group consisting of a phosphazene compound, an organic, nitrogenous base and mixtures t... | 09/19/1995 |
| 5449817 | Process for the preparation of organic isocyanates The preparation of organic isocyanates of formula by the thermal decomposition of the corresponding carbamates in an inert solvent, is improved by thermally treating the dissolved carbamate in separate steps, decomposing the carbamate to isocyanate and al... | 09/12/1995 |
| 5386057 | Process for the preparation of acyl isocyanates The invention concerns a process for the preparation of acyl isocyanates which consists of reacting oxalyl chloride with a salt selected from the group consisting of hydrohalides and sulphates of carboxamides and/or carbamates, unsubstituted on nitrogen, ... | 01/31/1995 |
| 5386053 | Multistep, continuous preparation of organic polyisocyanates A multistep process for the continuous preparation of organic polyisocyanates, preferably aliphatic or cycloaliphatic diisocyanates, by reacting the corresponding organic polyamines with carbonic acid derivatives and alcohols to give monomeric polyurethan... | 01/31/1995 |
| 5360931 | Continuous multi-stage process for the preparation of (cyclo) aliphatic diisocyanates A continuous multistage process for the preparation of (cyclo)aliphatic diisocyanates comprising a) condensing urea with a (cyclo)aliphatic diamine in the presence of an alcohol solvent to make a (cyclo)alkylenebisurea in a distillation reactor; b) reacti... | 11/01/1994 |
| 5349081 | Process for preparing isocyanates A process for preparing isocyanates comprising (a) contacting carbon dioxide and a primary amine in the presence of an aprotic organic solvent and a base selected from the group consisting of a phosphazene compound, an organic, nitrogenous base and mixtur... | 09/20/1994 |
| 5344965 | Preparation of a novel diisocyanate from norbornadiene Novel bicyclic alkyl dicarbamates are prepared from norbornadiene and other simple starting materials, and these are subsequently thermally cracked to novel diisocyanate norbornyl derivatives, which are, among others, useful for crosslinking active hydrog... | 09/06/1994 |
| 5326903 | Process for preparing isocyanates using sintered oxides A method for preparing isocyanates by the thermal decomposition of carbamates in the presence of a sintered oxide as catalyst under gaseous phase condition. The sintered oxide is composed of at least one element selected from the group consisting of boron... | 07/05/1994 |
