Abstract: A sealing material includes the following characteristics: a value of a dynamic elastic modulus, measured at a temperature of 80° C., at a frequency of 1 Hz, and with a deformation of 5%, that is at least 60% lower than a value of the dynamic elastic modulus measured at the temperature of 80° C., at the frequency of 1 Hz, and with a deformation of 1%; and the value of the dynamic elastic modulus, measured at the temperature of 80° C., at the frequency of 1 Hz, and with the deformation of 5%, that is greater than or equal to 0.05 kPa. A tyre for a vehicle wheel includes a carcass structure comprising at least one carcass ply and at least one layer of sealing material disposed in a radially inner position with respect to the at least one carcass ply. A process for producing the tyre is also disclosed.

Abstract: A sealing material includes the following characteristics: a value of a dynamic elastic modulus, measured at a temperature of 80° C., at a frequency of 1 Hz, and with a deformation of 5%, that is at least 60% lower than a value of the dynamic elastic modulus measured at the temperature of 80° C., at the frequency of 1 Hz, and with a deformation of 1%; and the value of the dynamic elastic modulus, measured at the temperature of 80° C., at the frequency of 1 Hz, and with the deformation of 5%, that is greater than or equal to 0.05 kPa. A tire for a vehicle wheel includes a carcass structure comprising at least one carcass ply and at least one layer of sealing material disposed in a radially inner position with respect to the at least one carcass ply. A process for producing the tire is also disclosed.

Abstract: A sealing material includes the following characteristics: a value of a dynamic elastic modulus, measured at a temperature of 80° C., at a frequency of 1 Hz, and with a deformation of 5%, that is at least 60% lower than a value of the dynamic elastic modulus measured at the temperature of 80° C., at the frequency of 1 Hz, and with a deformation of 1%; and the value of the dynamic elastic modulus, measured at the temperature of 80° C., at the frequency of 1 Hz, and with the deformation of 5%, that is greater than or equal to 0.05 kPa. A tyre for a vehicle wheel includes a carcass structure comprising at least one carcass ply and at least one layer of sealing material disposed in a radially inner position with respect to the at least one carcass ply. A process for producing the tyre is also disclosed.

Abstract: Thermosetting compositions comprising an N,N'-diphenylene-bis-imide of an unsaturated carboxylic acid and at least one non-imido comonomer copolymerizable therewith, are storage-stabilized against recrystallization of the bis-imide therefrom, by formulating same in the presence of a recrystallization preventing amount of an N,N'-toluene-bis-maleimide.The resultant compositions are useful solventless casting resins; also as coating/impregnating compositions.

Abstract: Glycidyl polyethers of polyphenols are prepared by reacting at least one alkali metal salt of a polyphenol with at least one 1-halogeno-2,3-epoxyalkane, in an anhydrous and essentially aprotic reaction medium, and in the presence of a catalytically effective amount of a catalyst which comprises a cross-linked organic polymeric support, said support having a plurality of catalytically active functional groups covalently coupled thereto, the free valence of said functional groups having the structural formula: ##STR1## The subject process is admirably suited, for example, for the preparation of epoxy resins from the disodium salt of bisphenol A and epichlorohydrin.

Abstract: Shaped articles having improved mechanical strengths are comprised of (i) a nylon polyamide resin, (ii) a reinforcing amount of glass fibers therefor, and (iii) an impact strength increasing amount of a (meth)acrylic compound having the structural formula:[CH.sub.2 .dbd.CR--CO--A].sub.n X (I)wherein R is hydrogen or methyl, n is an integer equal to 2, 3 or 4, A is the linkage --O-- or --NH-- and X is an organic radical of valency n selected from the group consisting of linear or branched chain alkylene radical having from 1 to 20 carbon atoms, such alkylene radical comprising one or more chain-interrupting oxygen bridges and/or one or more hydroxyl groups, an aralkylene radical wherein the aryl moiety contains from 6 to 10 carbon atoms and the alkylene moiety is as defined above, such aralkylene radical comprising one or more alkylene chain-interrupting oxygen bridges, and a triazino heterocycle.

Abstract: A molding composition is comprised of (i) a thermoplastic polymer, (ii) glass fibers and (iii) a bis-maleimide, and is useful for the fabrication of a variety of shaped articles, especially for the automotive industry [e.g., radiators, battery casings, fans, etc.].

Abstract: A coating or molding composition including a polyisocyanate and an unsaturated imide, and having a ratio of total isocyanate functions to total polymerizable double bonds in the imide in the range of from 0.3 to 15, in addition polymerized to hard, imide group containing polymers characterized by the recurring unit: ##STR1## Coatings and shaped articles formed from such polymers are hard, tough, thermally stable, solvent resistant and are good insulators.

Abstract: A coating or molding composition including a polyisocyanate and an unsaturated imide, and having a ratio of total isocyanate functions to total polymerizable double bonds in the imide in the range of from 0.3 to 15, is addition polymerized to hard, imide group containing polymers characterized by the recurring unit: ##STR1## Coatings and shaped articles formed from such polymers are hard, tough, thermally stable, solvent resistant and are good insulators.

Abstract: A coating or molding composition including a polyisocyanate, an unsaturated imide and an olefinically unsaturated comonomer copolymerizable with the unsaturated imide, and having a ratio of total isocyanate functions to total polymerizable double bonds in the imide in the range of from 0.3 to 15, is addition polymerized to hard, imide group containing polymers characterized by the recurring unit: ##STR1## Coatings and shaped articles formed from such polymers are hard, tough, thermally stable, solvent resistant and are good insulators.

Abstract: Novel imido copolymers, useful for the production of a variety of shaped articles, e.g., by molding, are prepared by reacting an oligoimide with an aromatic compound bearing labile hydrogen atom(s) on the nucleus thereof, or by co-reacting such oligoimide and aromatic compound with a polyamine.

Abstract: The invention provides a novel process for the preparation of glycidyl polyethers of polyphenols. The process comprises reacting at least one alkali metal salt of a polyphenol with at least one 2,3-epoxy-1-haloalkane in an anhydrous and essentially aprotic medium, in the presence of a compound of the formulaN[CHR.sub.1 --CHR.sub.2 --O--(CHR.sub.3 --CHR.sub.4 --O).sub.n --R.sub.5 ]3wherein n is an integer of from 0 to 10 inclusive; R.sub.1, R.sub.2, R.sub.3 and R.sub.4, which can be the same or different, are each a hydrogen atom or an alkyl radical having 1 to 4 carbon atoms; R.sub.5 is a hydrogen atom, an alkyl radical having 1 to 12 carbon atoms, a cycloalkyl radical having 3 to 12 carbon atoms, a phenyl radical, a ##STR1## radical or a ##STR2## radical; and m is an integer from 1 to 12 inclusive. The process is especially useful in the preparation of glycicyl polyethers of bisphenol A.

Abstract: Glycidyl polyarylethers are prepared by reacting at least one alkali metal salt of a polyhydric phenol with at least one 1-halo-2,3-epoxyalkane, in an anhydrous and aprotic heterogeneous reaction medium which includes acetonitrile, propionitrile, benzonitrile and/or ethylene sulfide.

Abstract: A molding composition is comprised of (A) polypropylene, (B) glass fibers and (C) an imido/NVP, or imido/NVP/polyester prepolymer, and is useful for the fabrication of a variety of shaped articles, especially for the automotive industry [e.g., radiators, battery casings, fans, etc.].

Abstract: A molding composition is comprised of (A) polypropylene, (B) glass fibers, (C) an unsaturated dicarboxylic acid imide, and (D) a thermoplastic elastomer, and is useful for the fabrication of a variety of shaped articles, especially for the automotive industry [e.g., radiators, battery casings, fans, etc.].

Abstract: A thermosetting composition is disclosed characterized in that it comprises (by weight) from 60 to 90% of a bis-maleimide of the formula: ##STR1## in which A represents a divalent radical chosen from the group consisting of phenylene radicals and radicals of the formula: ##STR2## where T represents --CH.sub.2 --, --C(CH.sub.3).sub.2 --, --O-- or --SO.sub.2 --; and from 10 to 40% of N-vinylpyrrolid-2-one. The preferred bis-maleimide is N,N'-(4,4'-diphenylmethane)-bis-maleimide. The composition may be modified by the addition of an unsaturated polyester. The composition is useful for the manufacture of molded articles or of articles having a cellular structure, or for the impregnation of electrical coils.

Abstract: A thermosetting composition is disclosed characterized in that it comprises (by weight) from 60 to 90% of a bis-maleimide of the formula: ##STR1## in which A represents a divalent radical chosen from the group consisting of phenylene radicals and radicals of the formula: ##STR2## where T represents --CH.sub.2 --, --C(CH.sub.3).sub.2 --, --O-- or --SO.sub.2 --; and from 10 to 40% of N-vinylpyrrolid-2-one. The preferred bis-maleimide is N,N'-(4,4'-diphenylmethane)-bis-maleimide. The composition may be modified by the addition of an unsaturated polyester. The composition is useful for the manufacture of molded articles or of articles having a cellular structure, or for the impregnation of electrical coils.

Abstract: A curable composition is provided which comprisesA. an imide group-containing compound which is eitherA. a bis-imide of the formula ##STR1## which D represents a radical of the formula ##STR2## in which Y represents H, CH.sub.3 or Cl, m is O or 1, and A represents a divalent organic radical containing 2 to 30 carbon atoms, orB. a mixture comprising a bis-imide of formula (I) and a mono-imide of the formula ##STR3## in which D is as defined above and R represents a hydrogen atom or a monovalent organic radical containing from 1 to 20 carbon atoms; andB. a polyurethane elastomer, in amounts such that the weight ratio ##EQU1## IS FROM 1/5 TO 4/1. Such compositions are useful for preparing moulded articles, adhesives, laminates and coatings.

Abstract: A polymer is disclosed that results from the reaction of:A. a polyimide of the formula: ##STR1## in which the symbol D represents a divalent radical selected from the class consisting of the radicals ##STR2## WHERE Y represents H, CH.sub.3 or Cl and m is 0 or 1, the symbol A represents an organic radical of valency n which may contain up to 30 carbon atoms, and n represents a number at least equal to 2;B. a polyamine of the formula(NH.sub.2).sub.p B (II)in which the symbol B represents an organic radical of valency p which may contain up to 30 carbon atoms, and p represents a number at least equal to 2; andC. a linear polyester, free from aliphatic unsaturation, and of molecular weight at least equal to 1,500, the amounts of these reactants being such that there are 1.2 to 5 imide groups per NH.sub.2 group, and the polyester represents up to 50% of the weight of the polyimide/polyamine/polyester combination. A process for making the polymer is also disclosed.

Abstract: Curable compositions are provided based on an imide group-containing compound, an amino compound and a polyurethane elastomer in specified proportions. These compositions can be cured to give articles possessing excellent impact strength.