Did You Know...
...that in the early 1940s GE engineer James Wright was charged with a task of utmost importance to the war effort: develop a cheap substitute for rubber that could be used to produce tires, gas masks and a whole host of military gear. Wright tackled the task diligently -- and wound up inventing Silly Putty.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 7435853 | Process for the production of di- and polyamines of the diphenylmethane series Di- and polyamines of the diphenylmethane series are produced by a) converting nitrobenzene and methanol in the presence of a catalyst to aniline, formaldehyde and carbon monoxide, and then b) converting the anilin... | 10/14/2008 |
| 7408083 | Method for the production of diaminodiarylmethanes A process is described for preparing diaminodiarylmethanes comprising the steps a) reacting an aromatic amine with a methylene-donating agent in the presence of homogeneous acid catalysts, b) removing the homogeneous acid catalyst from the ... | 08/05/2008 |
| 7364668 | Process for producing an amino composition The present invention provides a process for producing an amino composition by addition reaction between a polyamine and an unsaturated hydrocarbon compound in the presence of a strongly basic alkali metal catalyst to obtain an amino composition containing not more ... | 04/29/2008 |
| 7247749 | Bisaminophenyl-based curatives and amidine-based curatives and cure accelerators for perfluoroelastomeric compositions Novel monoamidine, monoamidoxime and bisamidine curatives, co-curatives and cure accelerators are provided for use with perfluoroelastomeric compositions as well as novel synthesis methods for making monoamidine- and monoamidoxime-based curatives, co-curatives and c... | 07/24/2007 |
| 7238840 | Process for the production of diaminodiphenylmethane and its higher homologues Method of preparing diaminodiphenylmethane and higher homologues thereof from aniline and formaldehyde in the presence of heterogeneous solid acid catalysts selected from (a) delaminated zeolites and/or (b) metal silicate catalysts having an ordered mesoporous pore ... | 07/03/2007 |
| 7183439 | Process for preparing 4-aminodiphenylamine intermediates The invention is directed to a method of producing one or more 4-aminodiphenylamine intermediates comprising the steps: a. bringing an aniline or aniline derivative and nitrobenzene into reactive contact; and b. re... | 02/27/2007 |
| 7115537 | Process for the regeneration of zeolite catalysts A process for the regeneration of a zeolitic catalyst which is at least partially exhausted by use in the synthesis of optionally substituted methylenedianiline (MDA) and derivatives thereof, or of a mixture of optionally substituted MDA and derivatives thereof, wit... | 10/03/2006 |
| 7105700 | Process for the synthesis of mixtures of methane diphenyl diamine and its higher homologues with a controlled isomer distribution A process for preparing methane diphenyl diamine (MDA) or a mixture of methane diphenyl diamine (MDA) and its higher homologues with a controlled isomer distribution using a modified zeolite having “shape selectivity”. The mixture contains compounds having the f... | 09/12/2006 |
| 6936737 | Process for the synthesis of mixtures of methane diphenyl diamine and its higher homologues with a controlled isomer distribution A process for preparing methane diphenyl diamine (MDA) or a mixture of methane diphenyl diamine (MDA) and its higher homologues with a controlled isomer distribution using a silanised zeolite have “shape selectivity”. The mixture contains compounds having the fo... | 08/30/2005 |
| 6846956 | Triarylmethane dyes Described is a triarylmethane dye of the formula I where R1 and R2 are independently methyl, ethyl or hydroxyethyl, Q is substituted or unsubstituited phenyl or naphthyl and A⊖ is the equivalent of an anion. It does not detach carc... | 01/25/2005 |
| 6818795 | Process for the preparation of mixtures of methylenedianiline and its higher homologous products Process for the production of methylenedianiline and its higher homologous products which comprises reacting aniline, or one of its derivatives, and formaldehyde, or one of its precursors, in one or two reactors in the presence of a solid acid catalyst selected from... | 11/16/2004 |
| 6673970 | Process for preparing methylene diphenylamines by partial neutralization of acidic methylene diphenylamines Disclosed herein is a process for preparing a reaction product containing methylene diphenylamine, comprising reacting aniline and formaldehyde in the presence of an acid catalyst wherein the acid level of the resulting reaction mixture is reduced during ... | 01/06/2004 |
| 6649798 | Method for production of diaminodiphenylmethanes The present invention concerns a process for the production of methylenedianiline (MDA) having a high monomer content.... | 11/18/2003 |
| 6610888 | Reaction of a solution comprising a mixture A method of reacting a solution comprising a mixture of chemical compounds which are in chemical equilibrium with one another with at least one further chemical compound (9) is provided. The method comprises the following steps: fractionation of the solut... | 08/26/2003 |
| 6410789 | Process for preparing aromatic polyamine mixtures In a process for preparing aromatic polyamine mixtures which contain compounds of the formula (I), H2 N--A--CH2 --B--NH2 (I) where A and B are 1,4-phenylene radicals each of which independently of one another can have 1 to 4 s... | 06/25/2002 |
| 5684180 | Fractionation and purification of aromatic polyamine mixtures and the use thereof The invention relates to a process for the fractionation and purification of aromatic polyamine mixtures and to the use thereof.... | 11/04/1997 |
| 5679840 | Fractionation and purification of aromatic polyamine mixtures and the use thereof The invention relates to a process for the fractionation and purification of aromatic polyamine mixtures and their use.... | 10/21/1997 |
| 5675035 | Fractionation and purification of aromatic polyamine mixtures and the use thereof The invention relates to a process for the fractionation and purification of aromatic polyamine mixtures and to their use.... | 10/07/1997 |
| 5672737 | Fractionation and purification of mixtures of aromatic polyamines and use thereof The invention relates to a process for the fractionation and purification of mixtures of aromatic polyamines and to the use thereof.... | 09/30/1997 |
| 5648519 | Fractionation and purification of aromatic polyamine mixtures and the use thereof The invention relates to a process for the fractionation and purification of aromatic polyamine mixtures and to the use thereof.... | 07/15/1997 |
| 5648520 | Fractionation and purification of aromatic polyamine and the use thereof The invention relates to a process for the fractionation and purification of aromatic polyamine mixtures and the use thereof.... | 07/15/1997 |
| 5286760 | Process for reducing impurity levels in methylene diphenyamines Disclosed herein is a process for preparing a reaction product containing methylene diphenylamine comprising reacting aniline with an aldehyde, in the presence of a low level of an acid wherein the acid level is reduced before digesting reaction mixture a... | 02/15/1994 |
| 5241119 | Process for the preparation of 4,4'-diaminodiphenyl-methane and its derivatives Process for the preparation of 4,4'-diaminodiphenylmethane and its derivatives. 4,4'-diaminodiphenylmethane and its derivatives are prepared by the condensation of aniline, or its derivative, and aldehyde, or its precursor and/or isomerization of appropri... | 08/31/1993 |
| 5047591 | Single-stage process for producing bis-(amino-nitrophenyl)-methane Bis-(amino-nitrophenyl)-methane can be produced in one stage with an approximately quantitative yield by condensing o-nitraniline and formaldehyde in water at a temperature of between 20° and 40° C. in the presence of sulfuric acid, and subsequently ... | 09/10/1991 |
| 4922019 | Derivatives of 2,2-bis-(3-aminophenyl)hexafluoropropane and process for the preparation of 2,2-bis-(3,4-diaminophenyl)hexafluoropropane The invention relates to compounds of the formula ##STR1## wherein R1 is hydrogen or an acyl group in which a non-aromatic hydrocarbon group of 1 to 6 carbon atoms is attached to the CO-group and R2 is H or NO2, if R | 05/01/1990 |
| 4554378 | Process for preparing polyamines with ion exchange resin catalysts Polyamines are prepared from aromatic amines and aliphatic aldehydes or ketones using cationic or acid ion exchange resins as a catalyst in an essentially oxygen-free atmosphere with the aromatic amines being distilled and protected from the atmosphere.... | 11/19/1985 |
| 4294987 | Process for preparing methylene dianilines An improvement is described in the process of preparing polymethylene polyphenyl polyamines by condensing aniline and formaldehyde in the presence of an acid catalyst in the initial condensation. The improvement enables the amount of acid which has to be ... | 10/13/1981 |
| 4287364 | Molybdenum catalyst for aniline-formaldehyde condensation Covers a method of preparing diaminodiphenylmethanes and higher homologues thereof which comprises the step of condensing aniline and formaldehyde in the presence of a molybdenum aluminide catalyst.... | 09/01/1981 |
| 4286107 | Silver catalysts used to prepare polyaminopolyphenylmethanes Covers a method of preparing diaminodiphenylmethanes and higher homologues thereof which comprises the step of condensing aniline and formaldehyde in the presence of a silver tungstate catalyst.... | 08/25/1981 |
| 4284816 | Method of preparing polyaminopolyphenylmethanes Covers a method of preparing diaminodiphenylmethanes and higher homologues thereof which comprises the step of condensing aniline and formaldehyde in the presence of a tungsten silicide catalyst.... | 08/18/1981 |
| 4284815 | Tungsten catalyzed aniline-formaldehyde condensation Covers a method of preparing diaminodiphenylmethanes and higher homologues thereof which comprises the step of condensing aniline and formaldehyde in the presence of a tungsten boride or sulfide catalyst.... | 08/18/1981 |
| 4172847 | Treatment of methylene-bridged polyphenylpolyamime mixtures A process for treating methylene-bridged polyphenylpolyamine mixtures prepared by the silica-alumina catalyzed condensation reaction of aniline and formaldehyde to obtain substantially pure low functionality Diaminodiphenylmethanes having increased 4,4'-p... | 10/30/1979 |
| 4162358 | Polyaromatic amine curing agents for epoxy resins A liquid methylene bridged polyaromatic amine curing agent for vicinal epoxide resins with high amine content is prepared by reacting an aromatic amine mixture of aniline containing two to eight mole percent of a mononuclear aromatic diamine having the am... | 07/24/1979 |
| 4071558 | Aromatic polyamines and their preparation A predetermined 2,4'-isomer content in a polyamine reaction mixture resulting from the aniline/formaldehyde condensation reaction can be achieved. Aniline and formaldehyde can be condensed in the presence of solid acidic catalysts to form a mixture of the... | 01/31/1978 |
| 4053513 | Barium nitride catalysts for the preparation of diamino-diphenylmethanes Covers a method of preparing diaminodiphenylmethanes and higher homologues thereof which comprises the step of condensing aniline and formaldehyde in the presence of a barium nitride catalyst. In another embodiment the barium nitride catalyst is used in c... | 10/11/1977 |
| 4052456 | Method of preparing polyaminopolyphenylmethanes Covers a method of preparing diaminodiphenylmethanes and higher homologues thereof which comprises the step of condensing aniline and formaldehyde in the presence of an aluminum silicide catalyst.... | 10/04/1977 |
| 4041078 | Method of preparing polyaminopolyphenylmethanes Covers a method of preparing diaminodiphenylmethanes and higher homologues thereof which comprises the step of condensing aniline and formaldehyde in the presence of a fluorinated graphite catalyst.... | 08/09/1977 |
| 4039581 | Process for the preparation of di(amino phenyl)methanes Aniline and formaldehyde are condensed (2-10 moles aniline per mole of formaldehyde) at ambient temperature in the absence of acid catalysts to give a mixture of aminals (anilinoacetals) and aniline from which the water is removed. The anhydrous aminals a... | 08/02/1977 |
| 4039580 | Process for preparing di(aminophenyl)methanes A process is described for the preparation of polymethylene polyphenyl polyamines containing from 40 to 60 percent by weight of diamine and also containing markedly less high molecular weight polyamines than products hitherto available. Phosgenation of th... | 08/02/1977 |
| 4036880 | Method of preparing polyaminopolyphenylmethanes Covers a method of preparing diaminodiphenylmethanes and higher homologues thereof which comprises the step of condensing aniline and formaldehyde in the presence of a molybdenum boride catalyst.... | 07/19/1977 |
