Additional Phosphorus Containing Ring Patents (Class 558/76)
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Patent number: 11124900Abstract: A type of flame-retardant cellulosic fiber and a preparation method thereof are disclosed. The preparation method includes extruding the cellulosic solution through a spinneret, coagulating, stretching, and water-washing to obtain a water-washed filament, which is then treated with a flame-retardant solution, and then rinsed and dried to prepare the flame-retardant cellulosic fiber. The water-washing temperature is ?90° C., the temperature of the flame-retardant solution during treatment is 60-90° C., and the rinsing temperature is 20-40° C. The flame retardant contains more than one of a group that forms a covalent bond with a hydroxy group of the cellulosic macromolecule, a group having the ability of self-crosslinking reaction, and a group that forms a hydrogen bond with a hydroxy group of the cellulosic macromolecule. The prepared flame-retardant cellulosic fiber is mainly composed of the cellulosic fiber matrix and the flame retardant dispersed in the matrix.Type: GrantFiled: October 14, 2019Date of Patent: September 21, 2021Assignee: DONGHUA UNIVERSITYInventors: Tiehan Wang, Shiqiang Cui, Hong Jin, Yang Zhang, Yan Liu, Yumei Zhang
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Publication number: 20150126762Abstract: This invention relates to a process for producing compounds derived from 9,10-Dihydro-9-Oxa-10-Phosphaphenantrene-10-oxide (DOPO). In particular, the invention relates to producing DOPO-derived compounds by reacting DOPO with diol compounds in the presence of a catalyst. This invention also relates to DOPO derived composition containing a high melting point diastereomer. The DOPO derived compounds may be useful as flame-retardants.Type: ApplicationFiled: January 12, 2015Publication date: May 7, 2015Inventors: Qiang Yao, Junuzo Wang, Arthur G. Mack
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Patent number: 9000077Abstract: A phosphazene compound having a vinyl group is manufactured by a reaction between a vinyl compound and a phosphazene compound having a hydroxyl group and added to a resin composition for manufacturing a prepreg or a resin film so as to be applicable to copper-clad laminates and printed circuit boards to thereby achieve satisfactory circuit laminate properties, namely low coefficient of thermal expansion, low dielectric properties, heat resistant, fire resistant, and halogen-free.Type: GrantFiled: June 19, 2013Date of Patent: April 7, 2015Assignee: Elite Material Co., Ltd.Inventor: Chen-Yu Hsieh
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Publication number: 20150051327Abstract: The main objection of the present invention is to provide a halogen-free flame retardant for resins which has a high heat resistance and is capable of exhibiting excellent flame retardance while maintaining a good transparency. The present invention provides a flame retardant for resins which includes a condensed phosphonic acid ester having a specific chemical structure, a flame-retarded resin composition containing the same, and a molded article made from the composition.Type: ApplicationFiled: July 26, 2012Publication date: February 19, 2015Applicant: MARUBISHI OIL CHEMICAL CO., LTD.Inventors: Junichi Kobayashi, Akira Ishikawa, Kai Miwa, Shigeto Iguchi
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Publication number: 20140357885Abstract: The present invention relates to novel, halogen-free flame retardant derived from 9,10-Dihydro-9-Oxa-10-Phosphaphenantrene-10-oxide (DOPO). This invention also relates to the use of the halogen free DOPO derived flame retardant in polymers.Type: ApplicationFiled: August 20, 2014Publication date: December 4, 2014Inventors: YU LI ANGELL, KIMBERLY M. WHITE, SCOTT E. ANGELL, ARTHUR G. MACK
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Publication number: 20140343183Abstract: A group of novel compounds containing one or more amino substituted DOPO (9,10-dihydro-9-oxa-phosphaphenthren-10-oxide) moieties. The compounds were found to have good flame retardant properties and also good thermal stability, which makes them particularly suitable as flame retardant additives for various thermoplastic polymers. In particular, they can be incorporated in a polyurethane foam.Type: ApplicationFiled: August 6, 2012Publication date: November 20, 2014Applicants: FRITZ NAUER AG, EMPA EIDGENOSSISCHE MATERIALPRUFUNGS- UND FORSCHUNGSANSTALTInventors: Sabyasachi Gaan, Matthias Neisius, Primo Mercoli, Shuyu Liang, Henri Mispreuve, Reinold Nascher
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Publication number: 20140323624Abstract: A phosphazene compound having a vinyl group is manufactured by a reaction between a vinyl compound and a phosphazene compound having a hydroxyl group and added to a resin composition for manufacturing a prepreg or a resin film so as to be applicable to copper-clad laminates and printed circuit boards to thereby achieve satisfactory circuit laminate properties, namely low coefficient of thermal expansion, low dielectric properties, heat resistant, fire resistant, and halogen-free.Type: ApplicationFiled: June 19, 2013Publication date: October 30, 2014Inventor: CHEN-YU HSIEH
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Publication number: 20140316032Abstract: The present invention relates to the use of aromatic P—N-compounds in flame retardant polymer compositions. These compositions are especially useful for the manufacture of flame retardant compositions based onthermoplastic polymers, especially polyolefin homo- and copolymers, polycondensates, such as polyamines or polyesters and duroplastic polymers, such as polyepoxides.Type: ApplicationFiled: November 8, 2012Publication date: October 23, 2014Applicant: BASF SEInventors: Rainer Xalter, Michael Roth, Manfred Doering, Ciesielski Michael, Sebastian Wagner
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Patent number: 8796389Abstract: The present invention relates to a method for thermal crosslinking of adhesives and also to products produced with these adhesives. An object of the invention is to provide a method for thermal crosslinking of adhesives where the crosslinking is covalent and (initiated by a chemical or physical stimulus) reversible. As and when required, the crosslinking method can also be configured to result in a covalent, irreversible network.Type: GrantFiled: June 15, 2012Date of Patent: August 5, 2014Assignee: TESA SEInventors: Alexander Prenzel, Sarah Bamberg
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Patent number: 8703882Abstract: Phosphorus-containing benzoxazine-based bisphenols and derivatives thereof are disclosed. The phosphorus-containing benzoxazine-based bisphenols are prepared by reacting DOPO with benzoxazine to form the phosphorus-containing benzoxazine-based bisphenols. The phosphorus-containing benzoxazine-based bisphenols can further to form advanced epoxy resins. The advanced epoxy resins can further be cured to form flame retardant epoxy thermosets.Type: GrantFiled: December 28, 2010Date of Patent: April 22, 2014Assignee: National Chunghsing UniversityInventors: Ching-Hsuan Lin, Hung-Tse Lin, Sheng Lung Chang, Yu-Ming Hu
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Patent number: 8586699Abstract: Phosphorus-containing compounds useful for flame retardant epoxy resins are disclosed. The flame retardant epoxy resins may be used to make electrical laminates. This invention is particularly useful in end use applications in which a low bromine or low halogen content is required or desired.Type: GrantFiled: February 15, 2012Date of Patent: November 19, 2013Assignee: Dow Global Technologies LLCInventor: Joesph Gan
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Publication number: 20130296597Abstract: A phosphorus-containing oligomer is represented by formula (1): (R1 represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, or a phenyl group; n is the number of repeating units and an integer of 1 or more; X is a structural unit represented by structural formula (x1) or (x2) below; Y is a hydrogen atom, a hydroxyl group, or a structural unit represented by the formula (x1) or (x2); and, in the formula (x1) or (x2), R2, R3, R4, and R5 each independently represent a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, a phenyl group, or an aralkyl group), wherein the content of components whose n is 2 or more in the formula (1) is in the range of 5% to 90% in peak area in GPC measurement.Type: ApplicationFiled: July 1, 2013Publication date: November 7, 2013Inventors: Koji Hayashi, Yutaka Satou
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Patent number: 8563661Abstract: Phosphorus-containing compounds useful for flame retardant epoxy resins are disclosed. The flame retardant epoxy resins may be used to make electrical laminates. This invention is particularly useful in end use applications in which a low bromine or low halogen content is required or desired.Type: GrantFiled: January 9, 2013Date of Patent: October 22, 2013Assignee: Dow Global Technologies LLCInventor: Joseph Gan
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Patent number: 8512466Abstract: Phosphorus-containing oligomer is represented by formula (1): (R1 represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, or a phenyl group; n is the number of repeating units and an integer of 1 or more; X is a structural unit represented by structural formula (x1) or (x2) below; Y is a hydrogen atom, a hydroxyl group, or a structural unit represented by the formula (x1) or (x2); and, in the formula (x1) or (x2), R2, R3, R4, and R5 each independently represent a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, a phenyl group, or an aralkyl group), wherein the content of components whose n is 2 or more in the formula (1) is in the range of 5% to 90% in peak area in GPC measurement.Type: GrantFiled: February 1, 2011Date of Patent: August 20, 2013Assignee: DIC CorporationInventors: Koji Hayashi, Yutaka Satou
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Publication number: 20130123401Abstract: Phosphorus-containing compounds useful for flame retardant epoxy resins are disclosed. The flame retardant epoxy resins may be used to make electrical laminates. This invention is particularly useful in end use applications in which a low bromine or low halogen content is required or desired.Type: ApplicationFiled: January 9, 2013Publication date: May 16, 2013Applicant: Dow Global Technologies LLCInventor: Dow Global Technologies LLC
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Patent number: 8440771Abstract: Phosphorus-containing compounds useful for flame retardant epoxy resins are disclosed. The flame retardant epoxy resins may be used to make electrical laminates. This invention is particularly useful in end use applications in which a low bromine or low halogen content is required or desired.Type: GrantFiled: January 20, 2012Date of Patent: May 14, 2013Assignee: Dow Global Technologies LLCInventor: Joseph Gan
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Patent number: 8362188Abstract: The present invention provides a flame-retardant hardener for epoxy resin having a compound represented by formula (I): In addition, the present invention also provides a flame-retardant resin material comprising the aforementioned flame-retardant hardener for epoxy resin. Moreover, the present invention further provides a method for manufacturing a flame-retardant hardener for epoxy resin, which can be directly applied in a resin curing process after a cooling step without additional purification. As described by the present invention, the flame-retardant hardener for epoxy resin in accordance with the present invention can replace the conventional toxic halogenated resins, and provide an environmental-friendly flame-retardant hardener for epoxy resin.Type: GrantFiled: June 20, 2012Date of Patent: January 29, 2013Inventor: Chien-Hong Chen
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Publication number: 20130018128Abstract: This invention relates to a process for producing compounds derived from 9,10-Dihydro-9-Oxa-10-Phosphaphenantrene-10-oxide (DOPO). In particular, the invention relates to producing DOPO-derived compounds by reacting DOPO with diol compounds in the presence of a catalyst. This invention also relates to DOPO derived composition containing a high melting point diastereomer. The DOPO derived compounds may be useful as flame-retardants.Type: ApplicationFiled: March 28, 2011Publication date: January 17, 2013Applicant: ALBEMARLE CORPORATIONInventors: Qiang Yao, Junzuo Wang, Arthur G. Mack
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Publication number: 20130012668Abstract: The present invention provides novel phosphinated compounds of monofunctional, bifunctional, multifunctional phenols represented by the following formulae and their derivatives, and preparation methods thereof:Type: ApplicationFiled: July 5, 2012Publication date: January 10, 2013Applicant: NATIONAL CHUNG HSING UNIVERSITYInventors: CHING-HSUAN LIN, YU-WEI TIAN
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Publication number: 20120289663Abstract: A thermosetting monomer comprising at least two of an aryl-cyanato group and at least two of a phosphorus group.Type: ApplicationFiled: December 22, 2010Publication date: November 15, 2012Inventors: Michael J. Mullins, Robert E. Hefner, JR., Mark B. Wilson
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Publication number: 20120276417Abstract: A lubricant for a magnetic disk that is excellent in heat resistance and is suitably used in a magnetic disk to be mounted on a magnetic recording device of a thermally assisted magnetic recording system and a magnetic disk provided with a lubricant layer containing this lubricant. The lubricant for a magnetic disk contains a compound where perfluoropolyether groups each having a perfluoropolyether main chain in its structure and a phosphazene ring at an end are linked to each other through a linking group. The linking group is an aliphatic group or a phosphazene ring. In a magnetic disk having at least a magnetic recording layer, a protective layer, and a lubricant layer on a substrate, the lubricant layer contains the lubricant for a magnetic disk.Type: ApplicationFiled: June 22, 2010Publication date: November 1, 2012Applicant: WD MEDIA (SINGAPORE) PTE. LTD.Inventors: Koichi Shimokawa, Katsushi Hamakubo
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Publication number: 20120149932Abstract: Phosphorus-containing compounds useful for flame retardant epoxy resins are disclosed. The flame retardant epoxy resins may be used to make electrical laminates. This invention is particularly useful in end use applications in which a low bromine or low halogen content is required or desired.Type: ApplicationFiled: February 15, 2012Publication date: June 14, 2012Applicant: Dow Global Technologies LLCInventor: Joesph Gan
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Publication number: 20120053265Abstract: The present invention relates to novel, halogen-free flame retardant derived from 9,10-Dihydro-9-Oxa-10-Phosphaphenantrene-10-oxide (DOPO). This invention also relates to the use of the halogen free DOPO derived flame retardant in polymers.Type: ApplicationFiled: May 19, 2010Publication date: March 1, 2012Applicant: ALBEMARLE CORPORATIONInventors: Yu Li Angell, Kimberly M. White, Scott E. Angell, Arthur G. Mack
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Patent number: 8124716Abstract: Phosphorus-containing compounds are disclosed which are obtainable by reacting: (A) at least one organophosphorus compound having a group selected from the group H—P?O; the group P—H and the group P—OH; and (B) at least one compound having the following Formula (I): [R?(Y)m?]m(X—O—R?)n??Formula (I) wherein R? is an organic group; Y is a functional group selected from the group consisting of hydroxy, carboxylic acid, and amine; X is a hydrocarbylene group; R? is hydrogen or a hydrocarbyl group having from 1 to 8 carbon atoms, R is alkyl or aryl group having from 1 to 12 carbon atoms; m?, m and n are, independently, numbers equal to or greater than 1. These compounds are useful for making flame retardant epoxy and polyurethane resins and ignition resistant thermoplastic resins, each of which is useful for a variety of end uses requiring flame retardancy or ignition resistance. Flame retardant epoxy resins may be used to make electrical laminates.Type: GrantFiled: November 4, 2010Date of Patent: February 28, 2012Assignee: Dow Global Technologies LLCInventor: Joseph Gan
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Patent number: 8058329Abstract: Nitrous bridged derivatives of 6H-dibenz[c,e][1,2]-oxaphosphorine-6-oxides, process for the preparation and use thereof. The invention refers to nitrous bridged derivatives of 6H-dibenz[c,e][1,2]-oxaphosphorine-6-oxides, a process for the preparation thereof and their use as flameproofing agents for polymers such as polyesters, polyamides, polycarbonates, polystyrenes, polyethylene, polypropylene, phenolic and epoxy resins.Type: GrantFiled: November 3, 2005Date of Patent: November 15, 2011Assignee: Schill+Seilacher “Struktol” AktiengesellschaftInventors: Berthold Just, Uwe Dittrich, Holger Keller, Manfred Doering, Uwe Storzer, Michael Ciesielski
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Publication number: 20110257347Abstract: Phosphorus-containing benzoxazine-based bisphenols and derivatives thereof are disclosed. The phosphorus-containing benzoxazine-based bisphenols are prepared by reacting DOPO with benzoxazine to form the phosphorus-containing benzoxazine-based bisphenols. The phosphorus-containing benzoxazine-based bisphenols can further to form advanced epoxy resins. The advanced epoxy resins can further be cured to form flame retardant epoxy thermosets.Type: ApplicationFiled: December 28, 2010Publication date: October 20, 2011Applicant: NATIONAL CHUNGHSING UNIVERSITYInventors: Ching-Hsuan LIN, Hung-Tse LIN, Sheng Lung CHANG, Yu-Ming HU
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Publication number: 20080287701Abstract: A bisbiphenylacylphosphine oxide of formula (I) and its preparation method are provided. The formula of —Ar— is First, 10-chloro-9,10-dihydro-9-oxa-10-phosphaphenanthrene (CDOP) is prepared by using 2-phenylphenol, and then is esterified to synthesize 6-methoxy-(6H)-dibenz[c,e][1,2]oxa-phosphorin (MDOP). Next, acid chloride compounds are added for performing the Arbuzov reaction to synthesize bisbiphenylacylphosphine oxide. CDOP is hydrolyzed to be derived into 9,10-dihydro-9-oxa-10-phosphaphen-anthrene-10-oxide (DOPO), and then DOPO reacts with arylaldehyde to form secondary alcohol. Therefore, bisbiphenylacylphosphine oxide is prepared by using secondary alcohol under oxidation. Also, under a coupling reaction, DOPO reacts with the acid chloride compounds by using a Lewis acid as a catalyst to prepare bisbiphenylacylphosphine oxide.Type: ApplicationFiled: June 18, 2008Publication date: November 20, 2008Applicant: CHUNG SHAN INSTITUTE OF SCIENCE AND TECHNOLOGYInventors: Wen-Chiung Su, Chang-Chih Lin, Ching-Shang Sheng
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Patent number: 7217828Abstract: Phosphinines of formula (I) can be combined with metal salts to prepare hydroformylation catalysts. The phosphinine complexes have two phosphorus centers that may be substituted with a variety of hetero atoms or alkyl substituents to modify the ligand characteristics of the phosphinine. Phosphinine metal complexes are employed under normal hydroformylation reaction conditions. The preparatory routes to the phosphinine ligands of formula (I) allow for their convenient synthesis.Type: GrantFiled: August 5, 2004Date of Patent: May 15, 2007Assignee: OXENO Olefinchemie GmbHInventors: Detlef Selent, Armin Boerner, Renat Kadyrov, Cornelia Borgmann, Dieter Hess, Klaus-Diether Wiese, Dirk Roettger
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Patent number: 6946569Abstract: Chiral phosphine ligands derived from chiral natural products including D-mannitol and tartaric acid. The ligands contain one or more 5-membered phospholane rings with multiple chiral centers, and provide high stereoselectivity in asymmetric reactions.Type: GrantFiled: March 2, 2004Date of Patent: September 20, 2005Assignee: The Penn State Research FoundationInventor: Xumu Zhang
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Patent number: 6797821Abstract: The present invention discloses an active-hydrogen-containing phosphorus compound for cross-linking a resin and for imparting flame-retardancy to the cured resin, and in particular to a cured frame-retardant epoxy resin prepared by reacting the hardener with a di- or poly-functional epoxy resin via an addition reaction between the active hydrogen and the epoxide group. The present invention also discloses an epoxy resin made from the active-hydrogen-containing phosphorus compound and epihalohydrin.Type: GrantFiled: January 30, 2002Date of Patent: September 28, 2004Inventors: Chun-Shan Wang, Jeng-Yueh Shieh, Ching Hsuan Lin
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Patent number: 6727377Abstract: Chiral phosphine ligands derived from chiral natural products including D-mannitol and tartaric acid. The ligands contain one or more 5-membered phospholane rings with multiple chiral centers, and provide high stereoselectivity in asymmetric reactions.Type: GrantFiled: November 6, 2001Date of Patent: April 27, 2004Assignee: The Penn State Research FoundationInventor: Xumu Zhang
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Publication number: 20030212288Abstract: Disclosed herein are processes for hydrocyanation and isomerization of olefins by using at least one multidentate phosphonite ligands, including organometallic phosphonite ligands with a Group VIII metal or Group VIII metal compound, and optionally, a Lewis acid promoter.Type: ApplicationFiled: June 4, 2003Publication date: November 13, 2003Inventors: Christian P. Lenges, Helen S. M. Lu, Joachim C. Ritter
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Patent number: 6613848Abstract: A hardener for an epoxy resin comprises a phenolic, thiophenolic, aminophenyl, tris-phenolic, tris-thiophenolic, tris-aminophenyl, tetrakis-phenolic, tetrakis-thiophenolic, or tetrakis-aminophenyl compounds; or phenol-formaldehyde or phenol-formaldehyde/melamine-formaldehyde resins wherein the phenyl rings are substituted with at least one of the structures wherein R1 and R2 independently are H, C1-C18 alkyl, C6-C18 aryl, C6-C18 substituted aryl, C6-C18 aryl methylene, or C6-C18 substituted aryl methylene; X is O, S or NH and Ar is wherein R is C1-C4 alkyl and n=0-5.Type: GrantFiled: May 16, 2000Date of Patent: September 2, 2003Assignee: National Science CouncilInventors: Chun-Shan Wang, Jeng-Yueh Shieh
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Patent number: 6441067Abstract: A series of novel phosphorus-containing compounds suitable for use as a flame retardant having the following formula are disclosed: wherein R1-R8 independently are H or C1-C4 alkyl; Y is —OH or wherein Q is H, —NO2, —NH2, —OH, —CH3, —CHO, —COOH, A is —O—, —, —CH2—, or —C(CH3)2—; R9 and R10 independently are H, or C1-C4 alkyl.Type: GrantFiled: August 23, 2001Date of Patent: August 27, 2002Assignee: Chung-Shan Institute of Science & TechnologyInventors: Yie-Shun Chiu, Meng-Dan Jiang, Ying-Ling Liu
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Patent number: 5932642Abstract: A description is given of novel compounds of formula I ##STR1## wherein R.sup.1, R.sub.2, R.sub.3, and R.sup.4 are hydrogen, alkyl, phenylalkyl, or alkoxy and where R.sub.5 and R.sub.6 are hydrogen or phenyl or together with the linking carbon atoms, are cycloalkenylene or cycloalkenylene which is interrupted by oxygen or sulfur. These compounds are useful as stabilizers for organic materials against oxidative, thermal or light-induced degradation.Type: GrantFiled: December 19, 1997Date of Patent: August 3, 1999Assignee: Ciba Specialty Chemicals CorporationInventors: Peter Nesvadba, Paul Dubs
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Patent number: 5914361Abstract: Phosphonites which are useful as a deterioration inhibitor for organic material and are represented by the following formula: ##STR1## wherein X represents a connecting group, and R.sup.A represents a phenyl group which may be optionally substituted; and a process for producing the same are provided.Type: GrantFiled: August 26, 1997Date of Patent: June 22, 1999Assignee: Sumitomo Chemical Company, LimitedInventors: Naoki Inui, Taketoshi Kikuchi, Kanako Fukuda
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Patent number: 5705668Abstract: New phosphazene derivatives, fully substituted by aromatic groups and perfluoropolyethereal chains, are utilized as stabilizers for oils and greases based on perfluoropolyethers. Such derivatives inhibit the degradation process affecting the perfluoropolyethereal chains when these are subjected to high temperatures in an oxidizing atmosphere and in the presence of metals, such as for example aluminium, titanium, vanadium and their alloys, or steels.Type: GrantFiled: October 30, 1996Date of Patent: January 6, 1998Assignee: Ausimont S.p.A.Inventors: Paolo Odello, Walter Navarrini, Richard Dickinson Chambers, Costante Corti
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Patent number: 5202297Abstract: Rhodium hydroformylation catalysts containing bisphosphite ligands of the formula I ##STR1## where --X-- is a divalent bisarylene radical or R.sup.1,W is a divalent arylene, bisarylene or alkylene radical, andR.sup.1 and R.sup.2 are identical or different and are substituted or unsubstituted alkylene or ortho-arylene.Type: GrantFiled: August 20, 1991Date of Patent: April 13, 1993Assignee: BASF AktiengesellschaftInventors: Peter M. Lorz, Werner Bertleff, Michael Roeper, Dieter Koeffer
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Patent number: 5075481Abstract: Compounds of formula I ##STR1## wherein n is 2-4, R.sub.1 is alkyl, cycloalkyl, phenylalkyl, phenyl or a radical of formula II ##STR2## R.sub.2, R.sub.3 and R.sub.4 are independently hydrogen, alkyl, cycloalkyl, phenylalkyl or aryl, or R.sub.3 and R.sub.4 together are alkylene, R.sub.5 and R.sub.6 are independently hydrogen, alkyl, cycloalkyl or phenylalkyl, R.sub.7 is hydrogen, alkyl or a group of the formula --(CH.sub.2).sub.k COOR.sub.8, where k is 0-2 and R.sub.8 is hydrogen or alkyl, and T is an n-valent hydrocarbon radical which may be interrupted by heteroatoms, are useful stabilizers for substrates subject to the deleterious effects of oxygen, heat and/or actinic radiation.Type: GrantFiled: August 23, 1990Date of Patent: December 24, 1991Assignee: Ciba-Geigy CorporationInventors: Peter Hofmann, Paul A. Odorisio, Glen T. Cunkle, Don Sabrsula
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Patent number: 4831178Abstract: 1,3,2-oxazaphospholidine aliphatic ester derivatives of the formula ##STR1## are effective in stabilizing organic materials against oxidative, thermal and actinic degradation, said derivatives being particularly effective as color improvers and process stabilizers in organic materials containing phenolic antioxidants.Type: GrantFiled: October 19, 1987Date of Patent: May 16, 1989Assignee: Ciba-Geigy CorporationInventors: Paul A. Odorisio, Stephen D. Pastor, James L. Hyun
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Patent number: 4751319Abstract: 1,3,2-oxazaphospholidine derivatives of the formula ##STR1## are effective in stabilizing organic materials against oxidative, thermal and actinic degradation, said derivatives being particularly effective as color improvers and process stabilizers in organic materials containing phenolic antioxidants.Type: GrantFiled: February 2, 1987Date of Patent: June 14, 1988Assignee: Ciba-Geigy CorporationInventors: Paul A. Odorisio, Stephen D. Pastor, James L. Hyun
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Patent number: 4732997Abstract: Photographic material containing magenta coupler is stabilized by incorporating a dibenzoxaphosphorin of the formula ##STR1## into the emulsion layer containing the coupler or into an adjoining colloid layer. The yellowing on dark storage of such material is substantially reduced as a result.The symbols A and n are defined in claim 1.Type: GrantFiled: November 18, 1986Date of Patent: March 22, 1988Assignee: Ciba-Geigy AGInventors: Paul Tschopp, David G. Leppard
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Patent number: 4694094Abstract: New organic compounds containing a phosphorus heterocycle of the phosphonite type, in which the phosphorus atom is connected on the one hand to an oxygen atom and on the other hand to an oxygen, sulphur or nitrogen atom, characterized by comprising two of such heterocycles, the two phosphorus atoms being connected by a hydrocarbon group. Preparation of these diphosphonites by the action of a tetrahalogeno- or tetraminodiphosphine upon a diol or an alcohol carrying a phenol, thiol, enol, acid or amine function.Type: GrantFiled: May 21, 1985Date of Patent: September 15, 1987Assignee: Societe Nationale Elf AquitaineInventors: Sylvain Juge, Yvonne Legras