Cellular Product Derived From Reactant Containing A Carbon To Chalcogen Bond Patents (Class 521/189)
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Patent number: 4613625Abstract: Aliphatic thermoplastic polyamide porous membranes are reacted with an acid halide of basicity above one to provide acid radicals within the membrane. The acid halide may be derived from an aromatic carboxylic acid or an aromatic derivative of a chlorosilane. The substituted aliphatic polyamide porous membrane lend themselves to the preparation of chemical derivatives of the membrane which are not readily available by aqueous synthesis and to increased density of derivatives which otherwise may be prepared in water.Type: GrantFiled: June 13, 1985Date of Patent: September 23, 1986Assignee: Memtec LimitedInventor: Douglas L. Ford
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Patent number: 4607093Abstract: Novel amorphous polyimides are provided which are formed by the polymerization of bismaleimides with sydnones wherein carbon dioxide is evolved.The polyimides are readily soluble in dipolar aprotic solvents and are further characterized by high temperature stability to at least 300.degree. C.The polymers find particular utility in the form of films and solutions useful for wire enamel and electrical coatings.Type: GrantFiled: April 8, 1985Date of Patent: August 19, 1986Assignee: The Dow Chemical CompanyInventor: Kwok K. Sun
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Patent number: 4607059Abstract: A gas-releasing composition of a t-alkylhydrazinium salt and/or a carbonylhydrazine and at least one compound selected from free radical forming sources, metal oxides, and sulfur and/or sulfur donor compounds wherein when sulfur and/or a sulfur donor compound is used, the composition will also contain one or more members selected from sulfur accelerators, metal oxides, and amino-alcohols. This novel gas-releasing composition permits the selectively tailoring of the gas evolution of a system in order to meet a wide range of specific application areas polymer characteristics and conditions over a wide temperature range.Type: GrantFiled: September 25, 1985Date of Patent: August 19, 1986Assignee: Pennwalt CorporationInventors: Chester J. Kmiec, Michael F. Novits
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Patent number: 4604409Abstract: Methods of producing high molecular weight polyamide-imide foams having superior flame resistance and the foam products produced thereby. Initially, an imidocarboxylic acid is prepared by reacting a suitable oxoimine with a suitable cyclic dianhydride at a temperature of from about 25.degree. to 250.degree. C. in the presence of a solvent or by melt condensation without a solvent. The ratio of oxoimine to dianhydride may be varied to vary the number of imido groups in the final monomer. The imidocarboxylic acid monomer is reacted with an organic isocyanate in the presence of a suitable tertiary diamine catalyst and water to produce the polyamide-imide foam. The material foams spontaneously at room temperature. The reaction may be accelerated by heat or the addition of suitable metal salts. Additives, such as surfactants, flame retardants, fillers, etc., may be added if desired.Type: GrantFiled: June 13, 1985Date of Patent: August 5, 1986Inventors: John Gagliani, John V. Long
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Patent number: 4602048Abstract: Polyphosphazene elastomers for use in making low density foam comprising a --P<.dbd.N].sub.n substantially linear backbone randomly substituted with 20-80 mole percent phenoxy, 20-80 mole percent lower alkylphenoxy, 1-50 mole percent alkoxy and 0.5-20 mole percent alkenylphenoxy and the foamed products made therefrom.Type: GrantFiled: November 20, 1985Date of Patent: July 22, 1986Assignee: Ethyl CorporationInventors: Harold R. Penton, F. Alexander Pettigrew
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Patent number: 4599365Abstract: Methods of foaming and fully curing polyimide resins entirely by the application of microwave energy. Foamable polyimide resins may be prepared by esterifying a suitable dianhydride, reacting the product with a suitable diamine, drying the resulting product and heating to spontaneously form a foam. In the past, such materials could be foamed but could not be satisfactorily cured to a resilient foam entirely by microwave energy. Post-foaming direct application of thermal energy was required to produce a satisfactory foam. We have found that adding a suitable oxoimine, such as caprolactam, to the reaction mixture results in a foam material which is fully and completely cured entirely by the application of microwave energy, considerably simplifying the process and reducing costs.Type: GrantFiled: November 19, 1985Date of Patent: July 8, 1986Inventors: John Gagliani, John V. Long
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Patent number: 4594208Abstract: A foam structure having a density of less than about 20 lbs/ft.sup.3. The method of forming the same comprising forming a homogeneous melt blend under pressure of a polymer member selected from the group consisting of polyetherimide resin particles, polycarbonate resin particles, a polymer blend of polyphenylene oxide and polystyrene in particle form imbibed with a blowing agent, followed by extrusion of the same into a lower pressure atmosphere. A composition comprising said particles imbibed with methylene chloride, chloroform, 1,1,2-trichloroethane or mixtures thereof. A method of thermoforming said foam in sheet form.Type: GrantFiled: June 18, 1984Date of Patent: June 10, 1986Assignee: Mobil Oil CorporationInventors: Charles M. Krutchen, Wen-Pao Wu
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Patent number: 4594287Abstract: A liquid impregnant containing furfural, an acid catalyst and a pore-forming agent comprising a surfactant, e.g. a polyalkylene oxide adduct, is impregnated into fine grained, isotropic graphite bodies and then polymerized and pyrolyzed. An increase in the density of the impregnated body and an improved surface finish is obtained by means of the liquid impregnant and method of this invention.Type: GrantFiled: July 29, 1985Date of Patent: June 10, 1986Assignee: Union Oil Company of CaliforniaInventor: Edward E. Hucke
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Patent number: 4587271Abstract: A foam structure having a density of less than about 20 lbs/ft.sup.3. The method of forming the same comprising forming a homogeneous melt blend under pressure of a polymer member selected from the group consisting of polyetherimide resin particles, polycarbonate resin particles, a polymer blend of polyphenylene oxide and polystyrene in particle form imbibed with a blowing agent, followed by extrusion of the same into a lower pressure atmosphere. A composition comprising said particles imbibed with methylene chloride, chloroform, 1,1,2-trichloroethane or mixtures thereof. A method of thermoforming said foam in sheet form.Type: GrantFiled: June 18, 1984Date of Patent: May 6, 1986Assignee: Mobil Oil CorporationInventors: Charles M. Krutchen, Wen-Pao Wu
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Patent number: 4585805Abstract: Methods of producing high molecular weight polyamide-imide foams having superior flame resistance and the foam products produced thereby. Initially, an imidocarboxylic acid is prepared by reacting a suitable oxoimine with a suitable cyclic dianhydride at a temperature of from about 25.degree. to 250.degree. C. in the presence of a solvent or by melt condensation without a solvent. The ratio of oxoimine to dianhydride may be varied to vary the number of imido groups in the final monomer. The imidocarboxylic acid monomer is reacted with an organic isocyanate in the presence of a suitable tertiary diamine catalyst and water to produce the polyamide-imide foam. The material foams spontaneously at room temperature. The reaction may be accelerated by heat or the addition of suitable metal salts. Additives, such as surfactants, flame retardants, fillers, etc., may be added if desired.Type: GrantFiled: September 23, 1985Date of Patent: April 29, 1986Inventors: John Gagliani, John V. Long
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Patent number: 4567211Abstract: Plasticized polyphosphazene compositions exhibiting excellent flame resistance and low smoke output are disclosed. The plasticizers are resinous alkylated naphthalenes condensed with formaldehyde which are characterized by methylene bridges between naphthalenic rings with softening points ranging from 28.degree. F. to 158.degree. F.Type: GrantFiled: March 4, 1985Date of Patent: January 28, 1986Assignee: The Firestone Tire & Rubber CompanyInventors: Arthur E. Oberster, John C. Vicic
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Patent number: 4556682Abstract: Methods of making modified polyimide compositions and the resulting compositions. A polyimide forming material is prepared by treating an aromatic dianhydride with an esterifying solvent, then adding a suitable diamine. In order to obtain a foam which is non-friable and resistant to repeated compressive forces, the selected diamine must contain an aliphatic moiety in the chain. This material is dried to a powder or film. A foam is produced by heating the material to reaction temperature for a period sufficient to produce a stable foam. The material melts, then spontaneously expands into a foam which becomes self supporting and cures to a resilient, flexible non-friable foam.Type: GrantFiled: May 23, 1985Date of Patent: December 3, 1985Inventors: John Gagliani, John V. Long
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Patent number: 4555528Abstract: A blend of an E/X/Y copolymer, where E is ethylene, X is a vinyl ester, and Y is carbon monoxide or sulfur dioxide, with a polymer of vinyl halide or vinylidene halide is foamed and cured by dispersing in the blend a blowing agent and sulfur or a sulfur-releasing agent and heating the blend containing those additives at 100.degree.-180.degree. C. for a sufficient time to produce curing and foaming. This process can be run either continuously or batchwise in conventional equipment under conventional conditions in the presence of air. Plasticizers and other materials which often interfere with peroxide cures can be present in the process of this invention. The foamed and cured products have excellent physical properties and ozone resistance.Type: GrantFiled: April 2, 1985Date of Patent: November 26, 1985Assignee: E. I. Du Pont de Nemours and CompanyInventor: Gary L. Loomis
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Patent number: 4548957Abstract: A liquid impregnant containing furfural, an acid catalyst and a pore-forming agent comprising a surfactant, e.g. a polyalkylene oxide adduct, is impregnated into fine grained, isotropic graphite bodies and then polymerized and pyrolyzed. An increase in the density of the impregnated body and an improved surface finish is obtained by means of the liquid impregnant and method of this invention.Type: GrantFiled: January 9, 1985Date of Patent: October 22, 1985Assignee: Union Oil Company of CaliforniaInventor: Edward E. Hucke
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Patent number: 4546115Abstract: Methods of making modified polyimide compositions and the resulting compositions. A polyimide forming material is prepared by treating an aromatic dianhydride with an esterifying solvent, then adding a suitable diamine. In order to obtain a foam which is non-friable and resistant to repeated compressive forces, the selected diamine must contain an aliphatic moiety in the chain. This material is dried to a powder or film. A foam is produced by heating the material to reaction temperature for a period sufficient to produce a stable foam. The material melts, then spontaneously expands into a foam which becomes self supporting and cures to a resilient, flexible non-friable foam.Type: GrantFiled: February 25, 1985Date of Patent: October 8, 1985Inventors: John Gagliani, John V. Long
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Patent number: 4543368Abstract: The present invention relates to a foamable polyetherimide resin. These foamable polyetherimides have an effective amount of a chemical blowing agent which decomposes at a temperature equal to or greater than the glass transition temperature of the polyetherimide resin and does not have an adverse effect on the polyetherimide.Type: GrantFiled: November 9, 1984Date of Patent: September 24, 1985Assignee: General Electric CompanyInventors: Robert W. Smearing, Daniel E. Floryan
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Patent number: 4540719Abstract: A blend of an E/X/Y copolymer, where E is ethylene, X is a vinyl ester, and Y is carbon monoxide or sulfur dioxide, with a polymer of vinyl halide or vinylidene halide is foamed and cured by dispersing in the blend a blowing agent and sulfur or a sulfur-releasing agent and heating the blend containing those additives at 100.degree.-180.degree. C. for a sufficient time to produce curing and foaming. This process can be run either continuously or batchwise in conventional equipment under conventional conditions in the presence of air. Plasticizers and other materials which often interfere with peroxide cures can be present in the process of this invention. The foamed and cured products have excellent physical properties and ozone resistance.Type: GrantFiled: January 18, 1985Date of Patent: September 10, 1985Assignee: E. I. Du Pont de Nemours and CompanyInventor: Gary L. Loomis
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Patent number: 4539336Abstract: Methods of making modified polyimide/polyimide-amide foams having selected compressive resistance and density characteristics and the resulting compositions. A suitable aromatic dianhydride is mixed with a suitable oxoimine and alcohol, which initially is believed to form a monoimide which is substantially/simultaneously esterified by the alcohol. To this mixture is added a suitable diamine to produce a polyimide forming material. This material is dried to a powder or film. A foam is produced by heating the material to reaction temperature for a period sufficient to produce a stable foam. The material melts, then spontaneously expands into a foam which becomes self supporting and cures to a resilient flexible foam. Depending upon heating conditions, a polyimide, polyimide-amide or mixture thereof may be produced, resulting in foams having varying physical properties. Within the mole ratio range of oxoimine to dianhydride of about 1.5:1 to about 0.Type: GrantFiled: December 6, 1984Date of Patent: September 3, 1985Inventors: John V. Long, John Gagliani
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Patent number: 4539342Abstract: A polyimide and a process for its preparation wherein the polyimide is prepared from reaction of an organic tetracarboxylic acid or derivative thereof with a mixture of an aromatic diamine and an amine-terminated butadiene-nitrile copolymer. The polyimides of the invention are particularly useful in the preparation of flexible foams.Type: GrantFiled: April 3, 1984Date of Patent: September 3, 1985Assignee: IMI-Tech CorporationInventors: Raymond Lee, David W. Okey, Gregory A. Ferro
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Patent number: 4536520Abstract: Foamed polyphosphazene articles having consistent appearance and physical properties are made by masticating a mixture of high molecular weight linear polyphosphazene, a curing agent (e.g., sulfur), an accelerator, a blowing agent and optionally fillers, processing aids and the like until the temperature of the composition rises to a pre-determined level. Mixing is stopped and the composition is shaped, heated to pre-cure and then heated to activate the blowing agent and complete the cure.Type: GrantFiled: June 11, 1984Date of Patent: August 20, 1985Assignee: Ethyl CorporationInventor: Warren B. Mueller
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Patent number: 4535101Abstract: A polyimide and a process for its preparation wherein the polyimide is prepared from reaction of an organic tetracarboxylic acid or derivative thereof with a mixture of an aromatic diamine and an amine-terminated fluoroether. The polyimides of the invention are particularly useful in the preparation of flexible foams.Type: GrantFiled: April 3, 1984Date of Patent: August 13, 1985Assignee: Imi-Tech CorporationInventors: Raymond Lee, Usman A. K. Sorathia, Gregory A. Ferro
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Patent number: 4535100Abstract: A foam structure having a density of less than about 20 lbs/ft.sup.3. The method of forming the same comprising forming a homogeneous melt blend under pressure of a polymer member selected from the group consisting of polyetherimide resin particles, polycarbonate resin particles, a polymer blend of polyphenylene oxide and polystyrene in particle form imbibed with a blowing agent, followed by extrusion of the same into a lower pressure atmosphere. A composition comprising said particles imbibed with methylene chloride, chloroform, 1,1,2-trichloroethane or mixtures thereof. A method of thermoforming said foam in sheet form.Type: GrantFiled: December 12, 1983Date of Patent: August 13, 1985Assignee: Mobil Oil CorporationInventors: Charles M. Krutchen, Wen-Pao Wu
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Patent number: 4535095Abstract: Process for compounding polyphosphazene gum by (a) mixing a composition comprising a curable polyphosphazene gum, filler, plasticizer and other conventional components but without any curing agent to form a non-curing masterbatch, (b) mixing a composition comprising a polyphosphazene gum and an excess amount of curing agent, at least 10 times that required to cure the phosphazene gum in this mixture and optionally containing other conventional components to form a concentrate and (c) blending the non-curing masterbatch from (a) with sufficient concentrate from (b) to provide an amount of curing agent sufficient to cure the entire resultant mixture.Type: GrantFiled: December 10, 1984Date of Patent: August 13, 1985Assignee: Ethyl CorporationInventor: Warren B. Mueller
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Patent number: 4535099Abstract: A polyimide and a process for its preparation wherein the polyimide is prepared from reaction of an organic tetracarboxylic acid or derivative thereof with a mixture of an aromatic diamine and an amine-terminated silicone. The polyimides of the invention are particularly useful in the preparation of flexible foams.Type: GrantFiled: April 3, 1984Date of Patent: August 13, 1985Assignee: Imi-Tech CorporationInventors: Raymond Lee, David W. Okey, Gregory A. Ferro
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Patent number: 4532263Abstract: A method for forming a molded polymer foam structure comprising expanding solvent imbibed polymer particles selected from the group consisting of a polyetherimide, a polycarbonate and a polyphenylene oxide-polystyrene blend and fusing the expanded particles together in a mold.Type: GrantFiled: December 12, 1983Date of Patent: July 30, 1985Assignee: Mobil Oil CorporationInventors: Charles M. Krutchen, Wen-Pao Wu
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Patent number: 4532094Abstract: A method for forming a molded thermoplastic foam structure comprising partially filling a mold with solvent imbibed particles of a thermoplastic resin, pressurizing said mold under conditions such as to prevent vaporization of said blowing agent during subsequent polymer melting, heating said polymer to a flowable state, releasing the mold pressure to permit foaming of the melt and expansion of the foamed polymer within the mold.Type: GrantFiled: December 12, 1983Date of Patent: July 30, 1985Assignee: Mobil Oil CorporationInventors: Wen-Pao Wu, Charles M. Krutchen
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Patent number: 4529646Abstract: A process is disclosed for producing a composite reverse osmosis membrane. The process involves forming a porous polysulfone membrane from a solution of polysulfone followed by quenching the polysulfone membrane in an aqueous solution of m-phenylenediamine followed by reacting the m-phenylenediamine on the polysulfone membrane with either trimesoyl chloride or cyclohexane-1,3,5-tricarbonyl chloride in a water immiscible solution thereof.Type: GrantFiled: October 31, 1984Date of Patent: July 16, 1985Assignee: E. I. Du Pont de Nemours and CompanyInventor: Sherman A. Sundet
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Patent number: 4521542Abstract: The use of arylsulphonyl hydrazones corresponding to the following general formula:Ar (SO.sub.2 --NH--N.dbd.R).sub.x (I)whereinAr represents a benzene, naphthalene, diphenyl, diphenyl ether, diphenyl sulphone or diphenylene oxide radical which may be substituted by methyl and/or chlorine;R represents the radical of an aldehyde or ketone without the carbonyl oxygen atom; andx represents 1 or 2;as blowing agents for the production of cellular or porous plastics articles.Type: GrantFiled: June 11, 1984Date of Patent: June 4, 1985Assignee: Bayer AktiengesellschaftInventors: Ernst Roos, Klaus Kircher
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Patent number: 4520044Abstract: A process is disclosed for producing a composite reverse osmosis membrane. The process involves forming a porous polysulfone membrane from a solution of polysulfone followed by quenching the polysulfone membrane in an aqueous solution of m-phenylenediamine followed by reacting the m-phenylenediamine on the polysulfone membrane with either trimesoyl chloride or cyclohexane-1,3,5-tricarbonyl chloride in a water immiscible solution thereof.Type: GrantFiled: July 30, 1984Date of Patent: May 28, 1985Assignee: E. I. Du Pont de Nemours and CompanyInventor: Sherman A. Sundet
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Patent number: 4520071Abstract: A spherical porous polyimide powder which is thermally infusible and is insoluble in an organic solvent, comprising spherical porous particles of a weight average particle diameter of 1 to 20 .mu.m comprising an aromatic polyimide having an inherent viscosity measured in sulfuric acid at a concentration of 0.5 g/dl at temperature of 30.+-.0.01.degree. C. of 0.1 to 2.0, wherein a packed bulk density is 100 to 600 g/l and a specific surface area measured by a nitrogen absorption method is 1 m.sup.2 /g or more.Type: GrantFiled: June 4, 1984Date of Patent: May 28, 1985Assignee: Nitto Electric Industrial Co., Ltd.Inventors: Yuzuru Noda, Toshio Nakajima
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Patent number: 4518717Abstract: Methods of making low density modified polyimide/polyimide-amide foams and the resulting compositions. An N-substituted aliphatic imide is prepared by reacting a suitable aromatic dianhydride with a suitable oxime. A polyimide forming material is prepared by dissolving the N-substituted aliphatic imide in an esterifying solvent, then adding a suitable aromatic diamine. This material is dried to a powder. A suitable hydrated compound which is stable up to at least about 100.degree. C. is mixed with the powder. A foam is then produced by heating the material to reaction temperature for a period sufficient to produce a stable foam. The material melts, then spontaneously expands into a foam which becomes self supporting and cures to a resilient flexible foam. The addition of the hydrated compound is found to result in an exceptionally low density foam.Type: GrantFiled: November 7, 1983Date of Patent: May 21, 1985Inventors: John V. Long, John Gagliani
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Patent number: 4517317Abstract: A polymer composition comprising an ethylene-vinyl acetate-carbon monoxide copolymer and a nitrogen-containing or an alicyclic epoxy compound, and a foamable polymer composition comprising an ethylene-vinyl acetate-carbon monoxide copolymer, a heat-decomposable organic blowing agent having a decomposition temperature of at least 90.degree. C., and a nitrogen-containing or an alicyclic epoxy compound.Type: GrantFiled: July 17, 1984Date of Patent: May 14, 1985Assignee: Du Pont-Mitsui Polychemicals Co., Ltd.Inventor: Seiichi Tada
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Patent number: 4510268Abstract: Flexibilized, rigid plastic foam sheets with improved properties particularly desirable for low temperature and cryogenic insulation can be prepared by mechanical compression of freshly expanded closed-cell thermoplastic foams. Thus an extruded foam sheet having a density of 20-100 kg/m.sup.3, a y-axial size size of 0.05 to 1.00 mm and a Y-axial compressive strength of at least 1.8 kg/cm.sup.2 is flexibilized with 0.25 to 240 hours of expansion to give a flexibilized foam with improved elongation, workability, crack resistance and water vapor barrier properties.Type: GrantFiled: April 9, 1982Date of Patent: April 9, 1985Assignee: The Dow Chemical CompanyInventors: Hiroshi Tonokawa, Masao Nakamura
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Patent number: 4506038Abstract: A method of preparing a polyimide foam which includes the steps of: preparing, foaming, and curing a precursor containing at least one alkyl ester of 3,3'4,4'-benzophenonetetracarboxylic acid; a meta- or para-substituted aromatic diamine; a heterocyclic diamine; an aliphatic diamine; and a solid blowing agent. The blowing agent is added to said precursor in a concentration which is sufficient to effect at least one of the following attributes of the foam: cell size, proportion of open cells, cell density, and indentation load deflection.Type: GrantFiled: December 3, 1982Date of Patent: March 19, 1985Assignee: I M L CorporationInventors: John Gagliani, Usman A. K. Sorathia, Raymond Lee
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Patent number: 4480054Abstract: Compatible blends of an ethylene/methacrylic or ethylene/acrylic acid dipolymer or a terpolymer with n-butyl or isobutyl acrylate with an ethylene/X/Y terpolymer, where X is vinyl acetate or an alkyl acrylate and Y is CO or SO.sub.2, with an elastomer, a blowing agent, and a curing agent can be readily formed into stiff foamed articles having very good physical properties, especially split tear and tensile strength. The foamed articles are useful, among others, in such applications as footwear, insulation, shock absorbance, floatation devices, seals and, gaskets.Type: GrantFiled: January 23, 1984Date of Patent: October 30, 1984Assignee: E. I Du Pont de Nemours and CompanyInventor: Susan J. Enderle
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Patent number: 4476254Abstract: Methods of making low density modified polyimide/polyimide-amide foams and the resulting compositions. An N-substituted aliphatic imide is prepared by reacting a suitable aromatic dianhydride with a suitable oxime. A polyimide forming material is prepared by dissolving the N-substituted aliphatic imide in an esterifying solvent, then adding a suitable aromatic diamine. This material is dried to a powder. A suitable hydrated compound which is stable up to at least about 100.degree. C. is mixed with the powder. A foam is then produced by heating the material to reaction temperature for a period sufficient to produce a stable foam. The material melts, then spontaneously expands into a foam which becomes self supporting and cures to a resilient flexible foam. The addition of the hydrated compound is found to result in an exceptionally low density foam.Type: GrantFiled: March 7, 1984Date of Patent: October 9, 1984Inventors: John V. Long, John Gagliani
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Patent number: 4471077Abstract: Microporous polylactide powders having an intrinsic isotropic structure being spherical in a shape and containing interconnecting hollow spaces or openings i.e., micropores are obtained by the steps of heating a polylactide in xylene until substantially complete solution is reached; cooling the resultant clear solution; and separating off the xylene.The microporous powder form powders can have active substances such as a medicament introduced therein i.e. unto the pores and the resultant powder can be used for controllably dispensing the medicament i.e., as a prolonged release form.Type: GrantFiled: May 16, 1983Date of Patent: September 11, 1984Assignee: Akzo NVInventor: Wolfgang Lange
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Patent number: 4447565Abstract: A method and a composition are provided for molding low density desiccant syntactic foam articles. A low density molded desiccant article may be made as a syntactic foam by blending a thermosetting resin, microspheres and molecular sieve desiccant powder, molding and curing. Such articles have densities of 0.2-0.9 g/cc, moisture capacities of 1-12% by weight, and can serve as light weight structural supports.Type: GrantFiled: December 7, 1981Date of Patent: May 8, 1984Assignee: The United States of America as represented by the United States Department of EnergyInventors: James W. Lula, James R. Schicker
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Patent number: 4442234Abstract: A nylon foam product produced by frothing in an intensive mixer a reaction mixture of catalyst, caprolactam and polyol prepolymer in the presence of a surfactant and gaseous frothing agent.Type: GrantFiled: July 25, 1983Date of Patent: April 10, 1984Assignee: Rogers CorporationInventor: Bruce G. Kosa
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Patent number: 4439381Abstract: Methods of converting essentially unpolymerized precursors into polyimides in which the precursors are exposed to microwave radiation. Preheating, thermal post-curing, and other techniques may be employed to promote the development of optimum properties; and reinforcements can be employed to impart strength and rigidity to the final product. Also disclosed are processes for making various composite artifacts in which non-polymeric precursors are converted to polyimides by using the techniques described above.Type: GrantFiled: May 11, 1981Date of Patent: March 27, 1984Assignee: I M L CorporationInventors: John Gagliani, Raymond Lee, Anthony L. Wilcoxson
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Patent number: 4434253Abstract: The subject invention is a foamable composition based on a blend of a carbon monoxide- or sulfur dioxide-containing ethylene copolymer and a vinyl or vinylidene halide polymer, and the closed-cell foamed article produced therefrom.Type: GrantFiled: February 22, 1983Date of Patent: February 28, 1984Assignees: E. I. Du Pont de Nemours and Company, Bata Shoe CompanyInventor: John Rys-Sikora
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Patent number: 4426463Abstract: Methods of making modified polyimide/polyimide-amide foams having selected compressive resistance and density characteristics and the resulting compositions. An N-substituted aliphatic imide is prepared by reacting a suitable aromatic dianhydride with a suitable oxoimine. Within the mole ratio range of oxoimine to dianhydride of about 0.5:1 to about 0.05:1 the compressive resistance of the final foam can be selected in accordance with the intended end use of the foam. Density and compressive resistance varies inversely with the oxoimine quantity in the ratio, being greatest with the 0.5:1 ratio and lowest with the 0.05:1 ratio. A polyimide forming material is prepared by dissolving the N-substituted aliphatic imide in an esterifying solvent, then adding a suitable aromatic diamine. This material is dried to a powder or film. A foam is produced by heating the mateial to reaction temperature for a period sufficient to produce a stable foam.Type: GrantFiled: April 15, 1983Date of Patent: January 17, 1984Inventors: John Gagliani, John V. Long
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Patent number: 4425441Abstract: A high temperature and flame resistant closed cell polyimide foam material and methods of making the foam. An aromatic tetracarboxylic acid dianhydride is reacted with an oxomine to produce an N-substituted imide, which is then esterified with a suitable alcohol. The resulting liquid is dried and the dry residue is reduced to a uniform powder having particles with diameters generally in the 0.5 to 10 mm. range. The powder is preferably further dried, either before or after final size reduction, in a moderate vacuum at moderate temperature to remove any excess residual alcohol. The powder spontaneously expands to form a closed cell foam when heated to a temperature in the range of about 90.degree. to 150.degree. C. for a suitable period. When the powder is expanded in a closed mold, a well consolidated, uniform, closed cell foam product results. When expanded in an unrestricted manner, closed cell "macroballoons" having average diameters between about 0.4 to 15 mm. result.Type: GrantFiled: February 10, 1983Date of Patent: January 10, 1984Inventors: John Gagliani, John V. Long
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Patent number: 4407980Abstract: A high temperature and flame resistant closed cell polyimide foam material and methods of making the foam. An aromatic tetracarboxylic acid dianhydride is reacted with an oxomine to produce an N-substituted imide, which is then esterfied with a suitable alcohol. The resulting liquid is dried and the dry residue is reduced to a uniform powder having particles with diameters generally in the 0.5 to 10 mm. range. The powder is preferably further dried, either before or after final size reduction, in a moderate vacuum at moderate temperature to remove any excess residual alcohol. The powder spontaneously expands to form a closed cell foam when heated to a temperature in the range of about 90.degree. to 150.degree. C. for a suitable period. When the powder is expanded in a closed mold, a well consolidated, uniform, closed cell foam product results. When expanded in an unrestricted manner, closed cell "macroballoons" having average diameters between about 0.4 and 15 mm. result.Type: GrantFiled: September 27, 1982Date of Patent: October 4, 1983Inventors: John Gagliani, John V. Long
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Patent number: 4394459Abstract: A crosslinked closed-cell microcellular article of a terpolymer of ethylene, carbon monoxide, and a softening monomer.Type: GrantFiled: September 2, 1982Date of Patent: July 19, 1983Assignee: E. I. Du Pont de Nemours & Co.Inventor: John Rys-Sikora
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Patent number: 4394464Abstract: Methods of making modified polyimide/polyimide-amide foams and the resulting compositions. An N-substituted aliphatic imide is prepared by reacting a suitable aromatic dianhydride with a suitable oxoimine. A polyimide forming material is prepared by dissolving the N-substituted aliphatic imide in an esterifying solvent, then adding a suitable aromatic diamine. This material is dried to a powder or film. A foam is produced by heating the material to reaction temperature for a period sufficient to produce a stable foam. The material melts, then spontaneously expands into a foam which becomes self supporting and cures to a resilient flexible foam. Depending upon heating conditions, a polyimide, polyimide-amide or mixture thereof may be produced, resulting in foams having varying physical properties.Type: GrantFiled: June 21, 1982Date of Patent: July 19, 1983Inventors: John Gagliani, John V. Long
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Patent number: 4391923Abstract: The subject invention is a foamable composition based on a blend of a carbon monoxide- or sulfur dioxide-containing ethylene copolymer and a vinyl or vinylidene halide polymer, and the closed-cell foamed article produced therefrom.Type: GrantFiled: September 27, 1982Date of Patent: July 5, 1983Assignee: E. I. Du Pont de Nemours & Co.Inventor: John Rys-Sikora
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Patent number: 4391922Abstract: Mono- and polyazoformamide, sulfonyl hydrazide, sulfonyl semicarbazide and/or dinitrosomethylene amine compounds act as chemical blowing agents and curatives for carbon monoxide-containing ethylene copolymers.Type: GrantFiled: May 6, 1982Date of Patent: July 5, 1983Assignee: E. I. Du Pont de Nemours and CompanyInventor: Jerald R. Harrell
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Patent number: 4380594Abstract: A filament of a thermoplastic synthetic polymer having a plurality of adjacent, separate discontinuous cavities is made by a process wherein a silicone oil and an inert gas or gas-forming substance are dispersed in a polymer melt, and the melt is extruded into a filament. The melt contains up to and including 1% by weight of the silicone oil, based on the weight of the melt, at the time it is extruded and up to and including 10% by weight of an inert gas.Type: GrantFiled: October 14, 1980Date of Patent: April 19, 1983Assignee: Akzona IncorporatedInventors: Erhard Siggel, Gerhard Wick, Heinz Linhart, Erich Kessler
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Patent number: RE31756Abstract: Methods of making modified polyimide/polyimide-amide foams and the resulting compositions. An N-substituted aliphatic imide is prepared by reacting a suitable aromatic dianhydride with a suitable oxoimine. A polyimide forming material is prepared by dissolving the N-substituted aliphatic imide in an esterifying solvent, then adding a suitable aromatic diamine. This material is dried to a powder or film. A foam is produced by heating the material to reaction temperature for a period sufficient to produce a stable foam. The material melts, then spontaneously expands into a foam which becomes self supporting and cures to a resilient flexible foam. Depending upon heating conditions, a polyimide, polyimide-amide or mixture thereof may be produced, resulting in foams having varying physical properties.Type: GrantFiled: December 27, 1983Date of Patent: December 4, 1984Inventors: John Gagliani, John V. Long