Abstract: The present invention relates to a halogen-free flame-retardant resin composition, based on the weight parts of organic solids, comprising (A) from 1 to 10 parts by weight of bismaleimide resin, (B) from 30 to 60 parts by weight of benzoxazine resin, (C) from 10 to 40 parts by weight of polyepoxy compound, (D) from 5 to 25 parts by weight of phosphorous-containing flame retardant, and (E) from 1 to 25 parts by weight of curing agent, which is amine curing agent and/or phenolic resin curing agent. The present invention further provides prepregs, laminates, laminates for printed circuits prepared from said resin composition.

Abstract: The present invention relates to a new process for preparing dithiine-tetracarboximides.

Abstract: The present invention provides amorphous maleimide-bismaleimide hybrid mixtures and methods for synthesizing such mixtures by condensation of diamine compounds with maleic anhydride along with one or more additional anhydrides. The invention provides a route to get passed the high melting point and the solubility issues of bismaleimide resins, yet to still obtain the good thermo-mechanical properties of these valuable molecules.

Abstract: The invention is based on the discovery that a remarkable improvement in the performance of maleimide thermosets can be achieved by incorporating amide-extended maleimides into an adhesive formulation. Amide-extended maleimides described herein can be used to toughen bismaleimide thermosetting materials without sacrificing any thermal stability. Amide-extended maleimides are readily prepared by reacting a bismaleimide with an appropriate amine via the well-known Michael addition reaction. Acylation of the resulting secondary amines provides the amide-extended maleimide. The acylating agent can also be used to introduce polymerizable functional groups into the backbones of these thermoset monomers. Amide-extended acrylate and methacrylate monomers can also be prepared.

Abstract: The present invention provides a novel ?-sulfonimide compound having at least one imide group and at least one sulfonyl group and a method for preparing the same.

Abstract: An exchange membrane containing modified maleimide oligomers comprising sulfonated poly(aryl ether ketone) (S-PAEK) and modified maleimide oligomers. The exchange membrane uses the modified maleimide oligomers having a hyper-branched architecture as matrix, and introduces them into S-PAEK to constitute semi-interpenetration network (semi-IPN), so as to intensify water holding capacity, chemical resistance, the electrochemical stability and thermal resistance of the ionic/proton exchange membrane. The exchange membrane can be used to fabricate the membrane electrode assemblies, fuel cells, and be applied them to the fields of seawater desalination, heavy water and sewage treatment, and biomass-energy resources.

Abstract: Provided is a pentaaryldiamine-containing bismaleimide compound of Formula (I): wherein Ar1 to Ar5 are independently C6-C12 aryl; and Ar4 and Ar5 are optionally substituted by one or more substitutent(s) selected from the group consisting of C1-C6 alkyl, C1-C6 alkoxy, and cyano. The compound of Formula (I) is obtained by a method including the steps of reacting a diamine with maleic anhydride in a solvent to form an amic acid, and cyclodehydrating the amic acid in the presence of a catalyst and a dehydrating agent. The compound of Formula (I) has a nonlinear and asymmetric structure, is amorphous, and is readily soluble in a variety of organic solvents so that the toughness of the product made there from can be improved and processing of the compound can be simplified.

Abstract: A compound represented by the following formula (1) or a salt thereof: The compound has an inhibitory activity on the production of interleukin-6, and is therefore useful as a therapeutic agent for a disease associated with interleukin-6, ocular inflammatory diseases and the like. In the formula, R1 represents a halogen atom, a hydrogen atom, a lower alkyl group which may have a substituent, a formyl group, or a lower alkylcarbonyl group which may have a substituent, R2 represents a bicyclic hydrocarbon group which may have a substituent or a bicyclic heterocyclic group which may have a substituent, R3 represents a hydrogen atom, a lower alkyl group which may have a substituent, an aryl group which may have a substituent, or an acyl group.

Abstract: The present invention relates to a new process for preparing dithiine-tetracarboximides.

Abstract: The present invention is directed to maleimides and preparation of compounds of the formula I wherein R1 and R2 independently from each other stand for variously substituted, and R3 stands for allyl, variously substituted, with the proviso, that R1 and R2 not simultaneously stand for phenyl.

Abstract: The present invention provide compounds of Formula I The present invention also provides a method of treating cancer and treating or preventing restenosis or atherosclerosis. Also provided by the present invention is a pharmaceutically acceptable composition containing a compound of Formula I.

Abstract: Aromatic maleimides can be prepared by reacting corresponding aromatic amines with maleic anhydride in the presence of a solvent mixture of halogenated hydrocarbon and a dipolar aprotic solvent, with the addition of acid and a polymerization inhibitor.

Abstract: The invention provides for tripyrrane compounds of the formula ##STR1## wherein: each Q represents, typically, an alkyl group, cycloalkyl group, aryl group, or a heteroaryl group; and each R represents hydrogen, an alkyl group, alcohol group, or a carbonyl-containing group. Additionally, there are described methods to prepare such compounds, for example, comprising the steps of:(a) reacting a compound of the formula:Q--CHO or Q--CH(OS)(OS')wherein S and S' are independently lower alkyl, an aryl group containing from 5 to 14 ring atoms, and --(CH.sub.2).sub.n -- where n=2-4;with a stoichiometric excess of a pyrrole having the formula: ##STR2## in the presence of a catalytic amount of an acid; (b) removing the unreacted pyrrole or any other solvents used in (a) by evaporation to form a residue; and(c) treating the residue to remove high molecular weight polymeric materials and the corresponding dipyrromethane by-product, leaving the desired compound.

Abstract: A novel bismaleimide compound having the following formula: ##STR1## is synthesized from 1,3-bis(aminomethyl)cyclohexane and maleic anhydride, and is readily soluble in a variety of ordinary low boiling point organic solvents.

Abstract: A non-crystalline ether-imide type high purity bismaleimide composition represented by formula (I): ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, and R.sup.4 each represent a hydrogen atom, a halogen atom, or an alkyl group having from 1 to 4 carbon atoms; R.sup.5 represents a hydrogen atom or a methyl group; and R.sup.6 represents a hydrogen atom, a methyl group or a phenyl group. The non-crystalline bismaleimide (I) has a purity of 95 wt % or higher, a melting point of not higher than 130.degree. C., and exhibits excellent solubility in a solvent.

Abstract: In a process for the preparation of substituted maleimides the corresponding amines are reacted with maleic anhydride and the thermal imidization of the resulting substituted amic-acids is effected in a mixed apolar/polar aprotic solvent medium in the presence of an acid catalyst, a substantial portion of the apolar solvent is subsequently selectively removed from the reaction mixture and most of the final product is precipitated.

Abstract: A process for preparing a flame retardant bisimide composition which comprises reacting i) diamine with ii) a mixture of ethylenically unsaturated dicarboxylic acid anhydride and a halogenated compound containing aromatic or bicyclo groups and an anhydride groups to form an intermediate bisamic acid composition, the molar ratio of the halogenated compound to the ethylenically unsaturated dicarboxylic acid anhydride being no more than 1:1; and dehydrating the bisamic acid composition to ring close the end groups and form a flame retardant bisimide composition having end groups which contain ethylenically unsaturated carbon-carbon bonds and end groups free of non-benzenoid unsaturation containing halogen atoms and aromatic or bicyclo groups.

Abstract: A process for the production of bismaleinimide derivatives of the formula: ##STR1## In the first step, maleic acid anhydride of the formula: ##STR2## is converted with a methyl-bis-aniline of the formula: ##STR3## in an unhalogenated aromatic hydrocarbon as the solvent, into the corresponding amide acid. In the second step, the amide acid is converted, without isolation, in the presence of an acid catalyst, into the end product of the formula I.

Abstract: A process for producing a lubricating oil dispersant additive comprises:step (1) reacting compound (A), wherein compound (A) is a hydrocarbyl-substituted or a substituted hydrocarbyl-substituted succinic acid or anhydride or ester thereof, with compound (B) of formula (I)H.sub.2 N(CHR.sup.1 CHR.sup.2 O).sub.n CHR.sup.3 CHR.sup.4 NH.sub.2(I)wherein one of R.sup.1 and R.sup.2 is hydrogen and the other is hydrogen or a lower alkyl group and n is an integer from 1 to 10 and one of R.sup.3 and R.sup.4 is hydrogen and the other is hydrogen or a lower alkyl group, each of the --(CHR.sup.1 CHR.sup.2 O)-- units being independently defined, to give a product (C) andstep (2) reacting product (C) with a diisocyanate (D) of formula (II)OCN--R.sup.5 --NCO (II)wherein R.sup.5 is a divalent organic group. Novel succinimides have been prepared by the disclosed process, lubricating oil compositions comprise 1-20% w/w of the modified succinimides. The succinimides have dispersancy and VI improver properties.

Abstract: A clayish formation, such as encountered in rock surrounding an oil well bore, is stabilized with a quaternary ammonium salt of an imide of polymaleic anhydride. The invention is particularly relevant to hydraulic fracturing fluids used for enhanced oil recovery.

Abstract: A process for producing a lubricating oil dispersant additive comprises:step (1) reacting compound (A), wherein compound (A) is a hydrocarbyl-substituted or a substituted hydrocarbyl-substituted succinic acid or anhydride or ester thereof, with compound (B) of formula (I)H.sub.2 N(CHR.sup.1 CHR.sup.2 O).sub.n CHR.sup.3 CHR.sup.4 NH.sub.2 (I)wherein one R.sup.2 and R.sup.2 is hydrogen and the other is hydrogen or a lower alkyl group and n is an integer from 1 to 10 and one of R.sup.3 and R.sup.4 is hydrogen and the other is hydrogen or a lower alkyl group, each of the --(CHR.sup.1 CH.sup.2 O)--units being independently defined, to give a product (C) andstep(2) reacting product (C) with a diisocyanate (D) of formula (II)OCN--R.sup.5 --NCO (II)wherein R.sup.5 is a divalent organic group. Novel succinimides have been prepared by the disclosed process, lubricating oil compositions comprise 1-20% w/w of the modified succinimdes. The succinimides have dispersancy and VI improver properties.

Abstract: This application relates to a process for preparing a N-t-alkyl-1,2-diacylhydrazine by reacting a 1,3,4-oxadiazole with a tertiary alkyl cation precursor in the presence of a strong acid catalyst. Preferably, the 1,3,4-oxadiazole is a 2,5-disubstituted-1,3,4-oxadiazole and more preferably a 2,5-diaryl-1,3,4-oxadiazole. The strong acid catalyst is preferably a sulfur containing acid and more preferably sulfuric acid.

Abstract: A novel aromatic bismaleimide of the formula (I): ##STR1## wherein X is ##STR2## where R.sub.1 R.sub.2, R.sub.3 and R.sub.4 are a hydrogen atom or a methyl group. The bismaleimide is prepared by reacting an aromatic diamine having the formula (II): ##STR3## wherein X is the same as in the formula (I), with maleic anhydride and then conducting the ring-closing reaction of the resultant aromatic bismaleamic acid.

Abstract: Solvent resistance in polyimide, polyamide, and other resins can be improved by capping these resing with mono- or difunctional crosslinking end caps. Imidophenylamines of the general formula: ##STR1## R.sub.1 =lower alkyl, lower alkoxy, aryl, aryloxy, substituted alkyl, substituted aryl, halogen, or mixtures thereof;Me=methyl;T=allyl or methallyl;i=1 or 2;j=0, 1, or 2; andG=--CH.sub.2 --, --O--, --S--, or --SO.sub.2 --.comprise a new family of end cap monomers that are reactants in the synthesis of crosslinking, solvent resistant oligomers. The imidophenylamines are prepared by reacting the corresponding acid halide with ammonia to form an amic acid and rearranging the amic acid to the amine.

Abstract: Novel homo bis-maleimide compounds containing sulfonate linkages are made by reacting an aromatic disulfonyl halide with m- or p-hydroxy phenyl maleimide and have the following formula: ##STR1## Similarly, co-bis-maleimides are made by reaching an aromatic disulfonyl halide, aromatic dihydroxy compound and m or p hydroxy phenyl maleimide having the structural formula: ##STR2## Herein R and R' are the same or different and are divalent radicals selected from the group consisting of meta arylene, para arylene, naphthalene and radicals of the formula A--A and A--Z--A wherein A is selected from the group consisting of meta arylene, para arylene and naphthalene and Z is selected from the group consisting of meta arylene, para arylene, naphthalene, carbonyl, sulfone, sulfide, sulfonyl, sulfonate, sulfoxide, ether, methylene, isopropyl, oxygen, alkyl, --CH.dbd.CH-- and --C.tbd.C-- and R.sub.1, R.sub.2, R.sub.3 and R.sub.

Abstract: A method for making polyimide polymers is provided by effecting reaction between an aliphatically unsaturated imide, such as maleimide, formaldehyde, and an organic polyamine, for example trimethylene bis(4-aminobenzoate), for example in refluxing ethanol. The polyimides produced by the simple one-step method are pure, and exhibit superior toughness, and reduced shrinkage upon cure by heating. The new product are useful as molding compounds, laminating resins, and the like, being especially suitable for airplane parts, advanced composites, high performance adhesives and printed circuit boards.

Abstract: The present invention provides a process for producing aromatic ether bismaleimides of the Formula (II) ##STR1## wherein A is a divalent mononuclear or polynuclear aromatic linking group. The process provides good yields and can be scaled up readily to commerical size runs.The present invention also provides compositions containing at least about 80 weight % of the bismaleimide of Formula (II) above.

Abstract: Novel bismaleimides of the formula ##STR1## wherein n=1, 2, or 3 are formed in two steps by reacting a diamine and maleic anhydride to form a bismaleamic acid which is reacted with acetic anhydride in the presence of acetone to form the bismaleimide.The bismaleimide monomer and prepolymers and the polybismaleimides formed from them may have improved flexibility, processibility, toughness and solubility.

Abstract: The difunctional polyfluoroaromatic compounds represented by the formula ##STR1## wherein X and Y are identical and are selected from the class consisting of --COOR.sup.1, --CH.sub.2 NH.sub.2, --CH.sub.2 NCO and ##STR2## wherein R.sup.1 is --H, alkyl and R.sup.2 and R.sup.3 independently are either --H, X or alkyl and n is either 0 or 1 are disclosed. These compounds are derived from those wherein X and Y are --CN which are produced in a solvent specific reaction. The process comprises reacting pentafluorobenzonitrile with a Grignard reagent of the formula CH.sub.3 MgHal, wherein Hal is --Cl or --Br, in the presence of either tetrahydrofuran, 1,3-dioxolane, dimethoxyethane or diglyme. When the solvent employed is tetrahydrofuran, the cyano compound wherein n is 1 is obtained. When the solvent is 1,3-dioxolane, the cyano compound wherein n is 0 is obtained.

Abstract: The present invention provides a process for producing aromatic ether bismaleimides of the Formula (II) ##STR1## wherein A is a divalent mononuclear or polynuclear aromatic linking group. The process provides good yields and can be scaled up readily to commercial size runs.The present invention also provides compositions containing at least about 80 weight % of the bismaleimide of Formula (II) above.

Abstract: Solutions of maleimide resins comprising a mixture of bismaleimides and low but solubilizing amounts of maleamic acids are provided at high solids levels, e.g. at least about 50%. Such solutions which comprise common solvents such as acetone, methyl ethyl ketone and toluene are useful in preparing laminates based on bismaleimide resins.

Abstract: N,N'-dimethyl aromatic diamines are prepared from the corresponding diprimary amines via a two step synthesis forming first the corresponding di-succinylimidomethylamine and then reductively cleaving the succinylimido group. The products are useful, e.g., as epoxy curing agents.

Abstract: Organic polymers which are "hydroxyphenyl-substituted" and "ether-substituted" polypyrroles ("PP") linked through N-adjacent C atoms, are disclosed which are compactable, extrudable and are also electrical conductors. When such PPs are prepared by electrochemical deposition with an appropriate electrolyte, they are also soluble in commonly available solvents, provided at least one of the 3- or 4-positions of the pyrrole nucleus is substituted with a substituent having either a hydroxyphenyl, or an ether structure. By choice of the hydroxyphenyl and/or ether substituent on one of the substitutable positions (3- or 4-) of the pyrrole nucleus, or both, the PP may be tailored for use either as a semiconductor having a conductivity in the range from about 10.sup.-5 to about 10.sup.-2 S/cm, or a relatively good conductor having a conductivity in the range from about 10.sup.-2 to about 10.sup.2 S/cm.

Abstract: Disclosed are novel alkenylphenylmaleimide derivatives having the general formula ##STR1## where R is an alkenyl radical of from 3 to 12 carbon atoms, R' is a hydrogen atom, a halogen atom, or a straight-chain or branched alkyl radical of from 1 to 4 carbon atoms, and n is a whole number of from 1 to 4, and linear dimers thereof as well as a process for the preparation of such maleimide compounds.

Abstract: The bismaleimide of dimer diamine is synthesized using N,N'-dicyclohexylcodiimide and 1-hydroxybenzotriazole.