| Patent Number |
Title Of Patent |
Date Issued |
| 6425944 |
Sulphonated polyimides, membranes prepared with them, and a fuel cell device that includes these |
July 30, 2002 |
| The invention relates to sulphonated polyimides, notably of formula (I) ##STR1##The invention also relates to an ion exchange membrane that includes such a polyimide and a fuel cell that includes such a membrane. The membranes of the invention have excellent durability and low cost and t |
| 6376129 |
Sulphonated polyimides, membranes prepared with them, and a fuel cell device that includes these |
April 23, 2002 |
| The invention relates to sulphonated polyimides, notably of formula (I) ##STR1##The invention also relates to an ion exchange membrane that includes such a polyimide and a fuel cell that includes such a membrane.The membranes of the invention have excellent durability and low cost and th |
| 6245881 |
Sulphonated polyimides, membranes and fuel cell |
June 12, 2001 |
| The invention relates to sulphonated polyimides, notably of formula (I) ##STR1##The invention also relates to an ion exchange membrane that includes such a polyimide and a fuel cell that includes such a membrane. The membranes of the invention have excellent durability and low cost and t |
| 5104968 |
Polyimide precursor composition and application therefrom |
April 14, 1992 |
| Polyimide precursor compositions incorporating at least one compound of fula (1), at least one compound of formula (2), at least one compound of formula (3) and at least one compound of formula (4) ##STR1## in which one of the groups R.sup.3 and R.sup.4 represents a hydrogen atom |
| 5093202 |
Method of gluing substrates using a composition comprising an arylaliphatic copolyimide with eth |
March 3, 1992 |
| Adhesive compositions are described comprising at least an arylaliphatic olyimide with ether chain formations, obtained by the polycondensation reaction of a tetracarboxylic aromatic acid or of one of its derivatives with at least two primary diamines, one of these diamines consisting o |
| 5064934 |
Thermosetting polyimide schiff base resins, their preparation and their applications |
November 12, 1991 |
| Thermosetting Schiff base resins, their preparation and their applications re described.These thermosetting Schiff base resins can be defined as responding to the general formula: ##STR1## Radicals Ar.sub.1, Ar.sub.2 and Ar.sub.3 are chosen so that the softening temperature of the |
| 5036111 |
Expanded materials with nadimide resin base |
July 30, 1991 |
| Expanded material obtained by heating a composition comprising at least one hermosetting nadimide resin, said heating being performed at a temperature and during a period which are sufficient to cause the expansion of said composition by release of cyclopentadiene. A nadimide resin of the |
| 4987218 |
Polybenzhydrol compositions ending with ethylenic unsaturated groups, cross-linked polymides res |
January 22, 1991 |
| Polymer compositions comprising poly(benzhydrolimide) chains ending with ethylenic unsaturated groups complying with the general formula: ##STR1## wherein Ar is a divalent aromatic radical and R a hydrogen atom or a monovalent hydrocarbon radical. They can be prepared by reacting, un |
| 4931541 |
Thermosetting quinazolone resins their preparation and their applications |
June 5, 1990 |
| Thermosetting quinazolone resins, their preparation and their applications re described.These thermosetting quinazolone resins can be defined as having the following general formula: ##STR1## in which Ar.sup.1 is a bivalent mono- or polycyclic aromatic radical and Ar.sup.2 is a bi |
| 4900332 |
Nitrogenous copolymers, their preparation and use as additives for improving the pour properties |
February 13, 1990 |
| Copolymers of average number molecular weight from about 300 to 5,000 comprising recurrent units originating (A) from alpha olefins, (B) from .alpha.,.beta. unsaturated .alpha., .gamma. dicarboxylic compounds, (C) from unsaturated acid esters of 1,2-diols, optionally etherified or es |
| 4814403 |
Oligomer compositions of polyaryloxypyridines with acetylenic end groups, their manufacture and |
March 21, 1989 |
| Oligomer compositions of polyaryloxypyridine with acetylenic end groups are btained by formation of an oligomer composition of polyaryloxypyridine with halogenated end groups from an alkaline diphenolate and a dihalogenopyridine, followed with an ethynylation reaction. The average pol |
| 4764578 |
Compositions of polyaryloxypyridine oligomers with phthalonitrile end groups, their preparation |
August 16, 1988 |
| The disclosed compositions of polyaryloxypyridine oligomers with phthalonile end groups are obtained by formation of a composition of polyaryloxypyridine oligomers with alkali phenolate end groups, followed with the reaction of said composition with 4-nitrophthalonitrile. Their aver |
| 4736015 |
Aromatic polyimide compositions of high solubility and their uses |
April 5, 1988 |
| Aromatic polyimide compositions, useful in particular for manufacturing adhesive materials, varnishes and films withstanding high temperatures, having a high solubility in organic solvents, particularly polar solvents and which are manufactured by reacting, in such a solvent, a tetraeste |
| 4731095 |
Nitrogen containing copolymers useful as additives for lowering the cloud point of hydrocarbon m |
March 15, 1988 |
| Copolymers with nitrogen groups are used as additives to lower the cloud point and improve the filterability limit temperature and the pour point of middle distillates such as gas oils. They are obtained by reacting a compound having a primary amine group with a copolymer comprising 15 t |
| 4720539 |
Polyimide precursor compositions, their manufacture, the resultant polyimides and their use, par |
January 19, 1988 |
| Polyimide precursor compositions are described which may be prepared by rting a biprimary aromatic diamine with a diester-diacid or an aromatic tetraacid, and then with the substantially stoichiometrical complement of an aromatic dianhydride.The polyimide precursor compositions are used |
| 4704229 |
Surface-active compounds of the sulfobetaines family, their manufacture and use, particularly fo |
November 3, 1987 |
| New surface-active compounds of the sulfobetaines group are manufactured. They comply with the general formula: ##STR1## wherein each of R.sub.1, R.sub.2 and R.sub.3 is substantially a hydrocarbon radical, each of R.sub.4 and R.sub.5 is a hydrogen atom or substantially a hydrocar |
| 4664676 |
Additives compositions useful in particular for improving the cold filterability properties of o |
May 12, 1987 |
| Additive compositions, useful in particular for improving the cold filterability properties of oil middle distillates, comprise:(A) at least one ethylene polymer; and(B) at least one polymeric compound resulting from the condensation of at least one compound comprising a primary amine group, |
| 4652273 |
Hydrocarbon middle distillates composition containing nitrogen-containing additives for decreasi |
March 24, 1987 |
| A hydrocarbon middle distillate contains an additive for decreasing its cloud point, obtained by reacting an aliphatic dicarboxylic compound selected from the maleic and alkylmaleic anhydrides, the alkenylsuccinic and polyalkenylsuccinic anhydrides and the corresponding dicarboxylic |
| 4645821 |
Precursor of copolyphthalocyanine-imide lattice, preparation, and the resultant lattice |
February 24, 1987 |
| Aromatic polyimide compositions, precursors of copolyphthalocyanine-imides, heir manufacturing process and the resultant copolyphthalocyanine-imides, are described.These compositions may result for the reaction of 80.degree.-300.degree. C. of an aromatic tetra acid, diester-diacid, tetrae |
| 4596680 |
Process for manufacturing aryl ethers having different substituents on the two aromatic rings |
June 24, 1986 |
| A asymmetrical aryl ether of the formulawherein Ar and Ar' are each a divalent aromatic radical, X and Y are electron attracting atoms or groups which differ from each other or have different positions on the corresponding aromatic radicals, is produced by heating together, in the presen |
| 4560490 |
Dispersing additive compositions for lubricating oils and their manufacture |
December 24, 1985 |
| An additive composition having a dispersing effect in lubricating oils is obtained by reacting at least one substituted succinic anhydride with at least one alkylphenol and with hexamethylene tetramine, preferably in respective proportions of from 1 to 2 moles of substituted succinic |
| 4511369 |
Copolymers with nitrogen groups, useful as additives for decreasing the cloud point of hydrocarb |
April 16, 1985 |
| Copolymers with nitrogen groups are used as additives to lower the cloud point of middle distillates such as gas oils. They are obtained by reacting a compound having a primary amine group with a copolymer comprising from 20 to 40% of recurrent units from a linear .alpha.-olefin, fro |
| 4473118 |
Enhanced oil recovery using oxidized crude oil |
September 25, 1984 |
| Enhanced recovery of oil from oil fields is effected by making use of an inexpensive surface-active agent formed by oxidizing a portion of crude oil with an aqueous solution of sodium hypochlorite at a temperature of 20.degree.-180.degree. C. The oxidized crude can be injected in the fie |
| 4433157 |
Process for manufacturing anhydrides of alkenyl dicarboxylic acids |
February 21, 1984 |
| A process for manufacturing an alkenyl dicarboxylic acid, anhydride comprises reacting at least one halogenated polyolefin with at least one unsaturated dicarboxylic acid anhydride in substantially stoichiometrical proportion, in the presence of a minor proportion of at least one organic |
| 4422856 |
N-Substituted succinimides, their preparation and use as motor fuel additives |
December 27, 1983 |
| N-substituted succinimides are obtained by reacting in a first stage, maleic anhydride with an oxyalkylated or polyoxyalkylated monoalcohol of formulawherein R.sup.1 is an aliphatic radical having from 12 to 25 carbon atoms, A is an alkylene radical having 2 to 4 carbon atoms and n is an |
| 4413133 |
Process for manufacturing chlorolactones from unsaturated carboxylic acids |
November 1, 1983 |
| Process for manufacturing chlorolactones by reacting, within an ahydrous organic solvent, a metal N-chlorosulfonamidate of the formula ##STR1## wherein R is a hydrogen or halogen atom or an alkyl radical, Ar is a mono- or polycyclic divalent aromatic radical and M is an alkali metal, |
| 4375974 |
Detergent compositions, their manufacture and their use as additives for fuels |
March 8, 1983 |
| A nitrogen-containing composition, useful as a detergent for gasoline, is obtained by reacting at least one unsaturated anhydride with at least one olefin to convert 20-80% of the anhydride and thereafter reacting the resultant product with a polyamine of the general formulawherein R.sup |
| 4310699 |
Process for synthesizing bis (phenylglyoxyloyl)benzenes usable for manufacturing polyphenylquino |
January 12, 1982 |
| Bis (phenylglyoxyloyl) benzenes are manufactured by a method comprising the reaction of terephthalic or isophthalic aldehyde first with a low proportion of an alkali metal cyanide in a solvent, and then with benzaldehyde; the resultant product is oxidized to the desired bis (phenylgl |
| 4304898 |
Thermosetting polyarylquinoxaline resins and their use, particularly in enameling varnishes |
December 8, 1981 |
| Enameling varnishes are made from particular polyarylquinoxaline resins; these resins comprise, in addition to arylquinoxaline groups, biphenylene or biquinoxalylene groups and their inherent viscosity at 30.degree. C. and 0.5 g/dl concentration in m-cresol is from 0.5 to 1.3 dl/g. |
| 4202960 |
Thermosetting aromatic resins and thermostable polymers derived therefrom |
May 13, 1980 |
| Thermostable, infusible and insoluble polymer obtained by thermosetting aromatic oligomers of low molecular weight in the presence of an acid catalyst, said aromatic oligomers having an average molecular weight up to about 5000, a softening temperature from 80.degree. to 400.degree. C. a |
| 4159898 |
Alkyl-guanidino-heterocyclic compounds, their manufacture and use as additives for fuels and lub |
July 3, 1979 |
| Alkyl-guanidino heterocyclic compound produced by alkylation with a halogenated hydrocarbon of the general formula RX.sub.n, of a guanidino-heterocyclic compound (A) of general formula: ##STR1## in which R is substantially a hydrocarbon radical containing about 10 to 200 carbon a |
| 4147728 |
Disubstituted meta-terphenyl compounds and resulting polymers |
April 3, 1979 |
| New tetracarbonyl compounds of the formulae: ##STR1## where R is a hydrogen atom, an alkyl radical or an aryl radical. The invention also contemplates the thermostable polymers obtained by reacting an aromatic tetra-amine with at least one of the above tetracarbonyl compounds. |
| 4143077 |
Diaryloxy-meta-terphenyl derivatives, their manufacture and uses |
March 6, 1979 |
| New aromatic compounds with ether functions particularly useful as power transmission fluids and as lubricants withstanding high temperatures, containing at least a major proportion of a compound of the formula: ##STR1## WHEREIN EACH Ar is selected from phenyl and metaphenoxy phenyl |
| 4118392 |
Dicarboxylic compounds and polyesters derived therefrom |
October 3, 1978 |
| New dicarboxylic compounds of the formula: ##STR1## where R is a hydrogen atom or an alkyl, cycloalkyl or aryl group of 1 - 10 carbon atoms, may be used for manufacturing polyester-imides and copolyester-imides -- Varnishes obtained therefrom are useful for coating electric metal |
| 4113637 |
Alkyl-guanidino-heterocyclic compounds, their manufacture and use as additives for fuels and lub |
September 12, 1978 |
| Alkyl-guanidino heterocyclic compound produced by alkylation with a halogenated hydrocarbon of the general formula RX.sub.n, of a guanidino-heterocyclic compound (A) of general formula: ##STR1## in which R is substantially a hydrocarbon radical containing about 10 to 200 carbon a |
| 4071459 |
Alkyl-guanidino-heterocyclic compounds, their manufacture and use as additives for fuels and lub |
January 31, 1978 |
| Alkyl-guanidino heterocyclic compound produced by alkylation with a halogenated hydrocarbon of the general formula RX.sub.n, of a guanidino-heterocyclic compound (A) of general formula: ##STR1## in which R is substantially a hydrocarbon radical containing about 10 to 200 carbon a |
| 4064176 |
Di-substituted meta-terphenyl compounds and resulting polymers |
December 20, 1977 |
| New tetracarbonyl compounds of the formula ##STR1## where R is a hydrogen atom, an alkyl radical or an aryl radical. The invention also contemplates the thermostable polymers obtained by reacting an aromatic tetra-amine with at least one of the above tetracarbonyl compounds. |
| 4061581 |
Trimethylolpropane esters useful as base lubricants for motor oils |
December 6, 1977 |
| A trimethylolpropane ester composition useful as lubricant base for motor-car engines is prepared by total esterification of trimethylolpropane by means of a mixture of saturated aliphatic carboxylic acids comprising 6-33% by mole of dicarboxylic acids having 4-19 carbon atoms and 94 |
| 4045414 |
New di-substituted meta-terphenyl compounds and resulting polymers |
August 30, 1977 |
| New tetracarbonyl compounds of the formulae: ##STR1## where R is a hydrogen atom, an alkyl radical or an aryl radical. The invention also contemplates the thermostable polymers obtained by reacting an aromatic tetra-amine with at least one of the above tetracarbonyl compounds. |
| 3985711 |
Dicarboxylic compounds having 2,4-quinazolinedione rings and polyester resins derived therefrom |
October 12, 1976 |
| A dicarboxylic compound complying with one of the general formulae: ##SPC1##In which R is a divalent radical selected from the aliphatic, alicyclic and aromatic radicals, the aliphatic containing 1-20 carbon atoms and the other containing from 5 to 20 carbon atoms, R.sup.1 is selected fr |
| 3980448 |
Organic compounds for use as fuel additives |
September 14, 1976 |
| This invention relates to gasoline compositions containing additives which are reaction products of a maleic anhydride of the formula ##EQU1## with a linear polyamine of the formulain which R.sub.1 and R.sub.2 are selected from the group consisting of a hydrogen atom and a monovalent |
| 3970630 |
2,4-Quinazoline dione-polyamide-ester resins |
July 20, 1976 |
| New polyamide-ester resins, their manufacture and the new compositions manufactured therefrom, the latter being useful for enameling metal conductors. The enameled conductors are stable at relatively high temperatures.The resins are manufactured from a polycarboxylic component, a part of |
| 3968085 |
Polyamine compositions useful as hardening agents for epoxy resins |
July 6, 1976 |
| The invention concerns new aromatic polyamine compositions useful as hardening agents containing a major proportion of polyamines of the formula: ##EQU1## IN WHICH Ar and Ar' are divalent aromatic radicals having from 1 to 6 rings, R.sub.1 is a divalent hydrocarbon radical or a r |
