With Specified Material Patents (Class 525/485)
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Patent number: 5643675Abstract: The invention relates to the use of tripotassium citrate monohydrate and other alkali metal salts of polybasic acid as bench life extenders in heat curable hot box foundry mixtures comprising sand, thermosetting binder resin, and a latent acid catalyst composition. In one embodiment, the thermosetting binder resin is a phenolic resole resin modified with urea formaldehyde resin. In another embodiment, the thermosetting binder resin is a furfuryl alcohol resin modified with urea formaldehyde resin.Type: GrantFiled: June 7, 1995Date of Patent: July 1, 1997Assignee: Borden, Inc.Inventors: William John Ward, Robert Anton Laitar, Bruce Eric Wise
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Patent number: 5641839Abstract: This invention relates to a semiconductor encapsulating novolac type epoxy resin with the reduced stress, which is obtained by an addition reaction 1 to 15% of a novolac type epoxy resin of the following formula with a monohydric or dihydric aliphatic alcohol: ##STR1## (wherein R.sub.1 is hydrogen, halogen, alkyl, or aryl; R.sub.2 is selected from the group consisting of hydrogen, alkyl, aryl, or aryl having a substituent which may be glycidylether; and n is an integer not less than 0.Type: GrantFiled: July 24, 1995Date of Patent: June 24, 1997Assignee: Totokasei Co., Ltd.Inventors: Chiaki Asano, Seigo Takuwa, Hideyasu Asakage
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Patent number: 5618891Abstract: A resin composition is provided that is suitable for impregnating sheet material, including fabrics, films, paper and tapes of the type employed to form prepregs, such as tapes used to form electrical insulation layers on electrical components. The resin composition includes a solid or semi-solid epoxy resin having an epoxide functionality of at least 2.5, a metal acetylacetonate for catalyzing the epoxy resin, and an accelerator of bisphenol A-formaldehyde novolac catalyzed by an acidic catalyst and having a hydroxyl equivalent weight of 120. The resin composition is essentially unreactive at room temperature and at elevated temperatures sufficient to enable permeation of the sheet material by the resin in its manufacture, is essentially unreactive at temperatures required to remove moisture and volatiles during processing of articles wrapped or taped with the sheet material, and cures at a higher temperature without adversely affecting the cure characteristics of the resin composition.Type: GrantFiled: March 29, 1995Date of Patent: April 8, 1997Assignee: General Electric Co.Inventor: Mark Markovitz
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Patent number: 5616631Abstract: Sand compositions containing a binder composition and a curing agent, in which the binder composition comprises (a) a binder comprising an acid-curable resin and (b) from 0.5 to 63.0% by weight, based on the binder composition, of at least one curing accelerator selected from compounds represented by formula (1): ##STR1## wherein X.sub.1, X.sub.2 each represent a hydrogen atom, a methyl group or an ethyl group;exhibit an increased curing rate to provide a casting mold having an increased initial strength.Type: GrantFiled: October 31, 1995Date of Patent: April 1, 1997Assignee: Kao CorporationInventors: Kazuhiko Kiuchi, Shigeo Nakai, Masuo Sawa, Masayuki Kato, Mitsuru Sakai, Shinya Nomura
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Patent number: 5614600Abstract: A fiber-reinforced resin plate comprising a fibrous base material and a matrix bonding the fibers contained in the fibrous base material, the matrix being formed by curing a resin composition comprising a highly reactive modified phenolic resin (A) prepared by polycondensing a petroleum heavy oil or pitch, a formaldehyde polymer and a phenol in the presence of an acid catalyst to thereby prepare a modified phenolic resin and-reacting the resultant modified phenolic resin with a phenol in the presence of an acid catalyst to thereby lower the molecular weight of the modified phenolic resin, and an epoxy resin (B). Also, a prepreg and a process for producing the fiber-reinforced resin plate.Type: GrantFiled: March 15, 1995Date of Patent: March 25, 1997Assignee: Kashima Oil Co., Ltd.Inventors: Masahiro Tsumura, Hiromi Miyasita, Kaneyoshi Oyama
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Patent number: 5607990Abstract: In the method described, one or more halogen-free phosphorus compounds are incorporated in the precondensed resins before the final resin-curing stage. During final curing, the phosphorus compounds are bound by covalent bonds into the resin structure and/or are trapped in the resin structure as such or in the form of aggregates or condensates.Type: GrantFiled: July 11, 1994Date of Patent: March 4, 1997Assignee: Chemische Fabrik Budenheim Rudolf A. OetkerInventors: Karlheinz Dorn, Klaus Frankenfeld, Hans-Dieter N agerl, Klaus Sommer
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Patent number: 5605984Abstract: Polymer compositions comprising phenol/formaldehyde systems and polyarylsulphones having epoxy pendent or end groups are disclosed together with novel epoxy-ended polyarylsulphones and novel cross-linked epoxy-ended polyarylsulphones. The compositions can be both unreinforced and reinforced with fibres and/or other fillers.Type: GrantFiled: September 21, 1990Date of Patent: February 25, 1997Assignees: Imperial Chemical Industries PLC, ICI Composites Inc.Inventors: Patrick T. McGrail, Jeffrey T. Carter
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Patent number: 5530048Abstract: The present invention is directed to a phenolic resin composition useful for preparing a binder for reinforced composites, to a binder for reinforced composites made using the phenolic resin composition, and to a reinforced composite made using the binder. The phenolic resin composition of the present invention contains an aqueous mixture of: (a) a resole formed by reacting phenol with formaldehyde at a mole ratio of formaldehyde to phenol ranging from about 0.6:1 to about 4:1 and (b) a sulfite or bisulfite, wherein the resole has a pH at least about 7 and less than 9.5 and the composition contains from about 0.007 to about 0.4 mole equivalent of sulfur per mole of phenol.Type: GrantFiled: October 25, 1994Date of Patent: June 25, 1996Assignee: Georgia-Pacific Resins, Inc.Inventors: Roderick A. McDonald, Mark J. Knudsen
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Patent number: 5503937Abstract: A curable composition which comprises:(1) a compound which contains on average more than 1 epoxy group per molecule;(2) a compound which contains on average more than 1 phenolic hydroxyl group per molecule; and(3) a catalytic amount of a catalyst compound which contains:(a) a cation containing at least one heterocyclic nitrogen-containing ring, and(b) an anion which is a conjugate base of fluoroarsenic acid, fluoroantimonic acid, fluorophosphoric acid, chloroarsenic acid, chloroantimonic acid, chlorophosphoric acid, nitric acid, hydrofluoric acid, trifluoroacetic acid, trifluoromethane sulfonic acid, picric acid, fluoboric acid, or an acid represented by the Formula:HBR.sub.3 R'wherein each R is independently a hydrocarbyl or substituted hydrocarbyl group and R' is a halogen, a hydrocarbonoxy group, a hydrocarbonamino group, or a hydrocarbonphosphino group.Type: GrantFiled: February 7, 1994Date of Patent: April 2, 1996Assignee: The Dow Chemical CompanyInventors: James L. Bertram, Louis L. Walker, John W. Muskopf
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Patent number: 5496889Abstract: Thermoplastic polyblend compositions, well suited for the production of mechanically strong and chemical-resistant shaped articles having a wide variety of chemical engineering and other applications, e.g., for the production of electrical cable for high-frequency electrical transmissions, comprise (i) a fluoropolymer, (ii) an aromatic polyester and (iii) a copolymeric compatibilizing agent therefor, the compatibilizing copolymer (iii) comprising the copolymerizate of ethylene, a glycidyl acrylate, an acrylic comonomer and, optionally, a peroxy comonomer.Type: GrantFiled: June 5, 1995Date of Patent: March 5, 1996Assignee: Elf Atochem S.A.Inventors: Bruno Schlund, Alain Bouilloux
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Patent number: 5484854Abstract: A molding material useful in the fabrication of an electrical or electronic part comprises a modified phenolic resin (A), an epoxy resin (B) and a curing agent (C), said modified phenolic resin prepared by heating heavy oil or pitch and a formaldehyde in a molar ratio of formaldehyde: (oil or pitch) of from 1-15:1 in the presence of an acid catalyst, adding phenol in a molar ratio of phenol: (oil or pitch) of from 0.5-5:1 to form a modified phenolic resin, and purifying by performing in optional sequence (i) a treatment with an aliphatic or alicyclic hydrocarbon and (ii) an extraction with an aromatic hydrocarbon solvent wherein the catalyst has a solubility of 0.1 or less to remove the catalyst.Type: GrantFiled: April 6, 1995Date of Patent: January 16, 1996Assignee: Kashima Oil Co., Ltd.Inventors: Masahiro Tsumura, Masao Tashima, Hiromi Miyasita, Haruhiko Takeda, Tomoaki Fujii
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Patent number: 5444124Abstract: Thermoplastic polyblend compositions, well suited for the production of mechanically strong and chemical-resistant shaped articles having a wide variety of chemical engineering and other applications, e.g., for the production of electrical cable for high-frequency electrical transmissions, comprise (i) a fluoropolymer, (ii) an aromatic polyester and (iii) a copolymeric compatibilizing agent therefor, the compatibilizing copolymer (iii) comprising the copolymerizate of ethylene, a glycidyl acrylate, an acrylic comonomer and, optionally, a peroxy comonomer.Type: GrantFiled: June 17, 1994Date of Patent: August 22, 1995Assignee: Elf Atochem S.A.Inventors: Bruno Schlund, Alain Bouilloux
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Patent number: 5412002Abstract: An epoxy resin composition contains an epoxy resin represented by the formula (I) and a curing accelerator: ##STR1## wherein R.sup.1 stands for ##STR2## where G stands for a glycidyl group, R.sup.2 stands for an alkyl group having 1 to 4 carbon atoms, R.sup.3 and R.sup.4 stand for the same or different groups and each denote a hydrogen atom or a glycidyl group, m and x each denote an integer of 0 to 10, n denotes an integer of 0 to 2, provided that m.gtoreq.x and, if m=0, then x=0, in which case at least one of R.sup.3 and R.sup.4 denotes a glycidyl group on the condition that when m.gtoreq.1 and m>x, R.sup.1 may each stand for different groups.Type: GrantFiled: December 9, 1992Date of Patent: May 2, 1995Assignee: Nippon Oil Co., Ltd.Inventors: Masami Enomoto, Susumu Kubota, Hitoshi Yuasa, Fumiaki Oshimi, Yutaka Otsuki
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Patent number: 5362775Abstract: An epoxy resin composition comprising (i) an epoxy resin, (ii) a phenolic curing agent, (iii) an organophosphorous curing agent, (iv) alumina, and (v) a separating means for separating the organophosphorous curing agent and the alumina, which may be a coating over the surfaces of the organophosphorous curing agent.Type: GrantFiled: March 24, 1992Date of Patent: November 8, 1994Assignees: Nippondenso Co., Ltd., Shin-Etsu Chemical Co., Ltd.Inventors: Akira Shintai, Hiroshi Shibata, Toshio Shiobara, Koji Futatsumori, Seizi Katayama, Yasutaka Yoshida
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Patent number: 5334675Abstract: Compositions containing an aryl phosphite and water to hydrolyze the aryl phosphite provide controlled and extended work time when used as hardening agents for the ambient temperature hardening of phenolic resins and for rapid hardening of such resins at modestly elevated temperatures. Pre-solvolysis with small quantities of water, alkanols of 1 to 4 carbon atoms or alkylene glycols of 2 to 4 carbon atoms improve compatibility of trisubstituted phosphites with the resin. Pre-hydrolysis of the phosphites as well as addition of furfuryl alcohol or alkylene glycols of 2 to 4 carbon atoms accelerate the hardening (curing) of the resin. Various compounds such as: carboxylic acid amides, urea, dicyandiamide, N-methylolated amides, N-alkyl 2-pyrrolidinones having 1 to 4 carbon atoms in the alkyl group, those having an internal epoxide group, alkanols, and Schiff bases retard the ambient temperature hardening of the resin with the aryl phosphite hardening agents.Type: GrantFiled: February 24, 1994Date of Patent: August 2, 1994Assignee: Borden, Inc.Inventor: Arthur H. Gerber
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Patent number: 5334674Abstract: Copolycondensation of a hydroxyl group-containing naphthalene and xylene with an aldehyde compound gives a polyhydroxy aromatic compound. The hydroxyl group-containing naphthalene comprises at least one of naphthols and dihydroxynaphthalenes. In the polyhydroxy aromatic compound, the proportions of the naphthalene unit and xylene unit are 95 to 50:5 to 50 (mole percent), and each molecule contains 2 to 20 naphthalene units. The polyhydroxy aromatic compound is useful as an epoxy resin curing agent. Reaction of the polyhydroxy aromatic compound with an epihalohydrin gives an epoxy resin. An epoxy resin composition can be prepared from the epoxy resin and a curing agent.Type: GrantFiled: June 18, 1992Date of Patent: August 2, 1994Assignees: Dai-Ichi Kogyo Seiyaku Co., Ltd., Nitto Denko CorporationInventors: Akihiro Naka, Shuichi Ito, Shinya Akizuki, Kiyoshi Saito
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Patent number: 5317067Abstract: The present invention provides an epoxy resin composition which is obtained by melt-mixing 100 parts by weight of an epoxy resin with 3 to 33 parts by weight of a thermoplastic resin alone or in combination with other components and additives than a hardener in the first mixing step and then with a hardener alone or in combination with other components and additives in the second mixing step, said epoxy resin having a number-average molecular weight of at least 200 and lower than 5000 and said thermoplastic resin having a number-average molecular weight of at least 5000; an adhesive epoxy resin molded article which is obtained by molding said epoxy resin composition; a process for producing an adhesive epoxy resin molded article which comprises molding said epoxy resin composition into a 0.01 to 10 mm thick film or sheet in a substantially uncured state and subsequently punching the film or sheet at temperatures higher than 15.degree. C. and lower than 70.degree. C.Type: GrantFiled: February 3, 1992Date of Patent: May 31, 1994Assignee: Tokyo Tire & Rubber Company LimitedInventors: Koji Yagi, Seiichi Fukunaga
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Patent number: 5302672Abstract: A 1,1-bis(2,7-diglycidyloxy-1-naphthyl)alkane as an epoxy resin; a 1,1-bis(2,7-dihydroxy-1-naphthyl)alkane as an intermediate for said epoxy resin; a process for producing said intermediate comprising reacting 2,7-dihydroxy-1-naphthalene and an aldehyde; a process for producing said epoxy resin comprising reacting said intermediate and an epihalohydrin; and an epoxy resin composition comprising said epoxy resin and a curing agent. The epoxy resin has a low melt viscosity while exhibiting excellent heat resistance.Type: GrantFiled: February 26, 1992Date of Patent: April 12, 1994Assignee: Dainippon Ink and Chemicals, Inc.Inventors: Ichiro Ogura, Shunji Ehara, Taku Kitamura, Hiroshi Sakata
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Patent number: 5302666Abstract: A resin composition for fiber reinforced plastic comprising the following components A, B, C, D and E as essential components:A: a bisphenol A epoxy resin having an epoxy equivalent of at most 250 and being liquid at room temperature,B: a bisphenol A epoxy resin having an epoxy equivalent within a range of from 400 to 5,000 and softening point of from 60.degree. to 200.degree. C.,C: a phenol novolak type epoxy resin,D: a nitrile rubber, andE: a curing agent.Type: GrantFiled: January 4, 1991Date of Patent: April 12, 1994Assignee: Mitsubishi Kasei CorporationInventors: Seiichi Hino, Jun Enda, Masaki Yamamoto
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Patent number: 5302673Abstract: Copolycondensation of .alpha.-naphthol and .beta.-naphthol with an aldehyde compound gives a poly-hydroxynaphthalene compound having an average molecular weight of 300 to 2,000. This compound is useful as a curing agent for epoxy resins and as a precursor of epoxy resins. Epoxy resin compositions include (1) compositions comprising an epoxy resin and the poly-hydroxynaphthalene compound as a curing agent and (2) compositions comprising an epoxy resin obtained by reacting the poly-hydroxynaphthalene compound with an epihalohydrin and a curing agent. The epoxy resin compositions of the invention are characterized in that the cured resins have a high glass transition temperature and high heat stability and high moisture resistance, scarcely allowing package cracking even in soldering treatment. Therefore the compositions are suited for use in encapsulating semiconductors.Type: GrantFiled: June 18, 1992Date of Patent: April 12, 1994Assignees: Dai-Ichi Kogyo Seiyaku Co., Ltd., Nitto Denko CorporationInventors: Akihiro Naka, Shuichi Ito, Shinya Akizuki, Kiyoshi Saito
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Patent number: 5296520Abstract: Compositions containing aryl phosphites and water to hydrolyze the aryl phosphite provide controlled and extended work time when used as hardening agents for the ambient temperature hardening of phenolic resins and for rapid hardening of such resins at modestly elevated temperatures. Pre-solvolysis with small quantities of water, alkanols of 1 to 4 carbon atoms or alkylene glycols of 2 to 4 carbon atoms improve compatibility of trisubstituted phosphites with the resin. Pre-hydrolysis of the phosphites as well as addition of furfuryl alcohol or alkylene glycols of 2 to 4 carbon atoms accelerate the hardening (curing) of the resin. Various compounds such as: carboxylic acid amides, urea, dicyandiamide, N-methylolated amides, N-alkyl 2-pyrrolidinones having 1 to 4 carbon atoms in the alkyl group, those having an internal epoxide group, alkanols, and Schiff bases retard the ambient temperature hardening of the resin with the aryl phosphite hardening agents.Type: GrantFiled: December 9, 1992Date of Patent: March 22, 1994Assignee: Borden, Inc.Inventor: Arthur H. Gerber
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Patent number: 5280063Abstract: A room temperature setting carbonaceous cement comprising a solid carbonaceous material, a catalyst and a liquid carbonizable component which when treated with the catalyst will provide a carbon yield of at least 40% at an elevated baking temperature and possess a flexural strength which is above at least 750 psi at room temperature and at said elevated temperature.Type: GrantFiled: April 17, 1992Date of Patent: January 18, 1994Assignee: Ucar Carbon Technology CorporationInventors: Irwin C. Lewis, Terrence Pirro, Ronald A. Greinke, Richard I. Bretz, Dennis J. Kampe
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Patent number: 5266612Abstract: An epoxy resin composition for sealing semiconductor elements comprising o-cresol-novolak type epoxy resins, curing agents, curing accelerators, inorganic fillers, plasticizers and imide-epoxy resins having the formula (I) is disclosed. Use of the imide-epoxy resin in an amount of 0.1 to 20.0% by weight improves the heat and moisture resistant properties of the epoxy resin composition. ##STR1## wherein, R.sub.1 and R.sub.2 denote independently H or (CH.sub.2)nCH.sub.3 radical,n denotes 0 or an integer of 1 above.Type: GrantFiled: January 6, 1993Date of Patent: November 30, 1993Assignee: Cheil Industries, Inc.Inventors: Whan G. Kim, Ji Y. Lee
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Patent number: 5248740Abstract: A rodlike mesogenic moiety-containing polythiirane resin is blended with an epoxy resin and when cured with a curing agent is useable in molding applications.Type: GrantFiled: November 12, 1992Date of Patent: September 28, 1993Assignee: The Dow Chemical CompanyInventors: Robert E. Hefner, Jr., Jimmy D. Earls
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Patent number: 5212261Abstract: Latent, heat-curable epoxy resin compositions containing metal carboxylate curing systems provide exceptional latency, particularly at elevated temperature, as well as facile curing, high T.sub.g and adhesive strength, and other attractive properties. The metal carboxylates comprise alkali metals and alkaline earth metals, aromatic and aliphatic metal carboxylates. The preferred curing systems comprise synergistic combinations of the metal carboxylates with cure modifiers.Type: GrantFiled: December 17, 1990Date of Patent: May 18, 1993Assignee: Henkel Research CorporationInventor: Thomas J. Stierman
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Patent number: 5182340Abstract: A rodlike mesogenic moiety-containing polythiirane resin is blended with an epoxy resin, is curable with a curing agent and can be employed in molding applications.Type: GrantFiled: October 9, 1990Date of Patent: January 26, 1993Assignee: The Dow Chemical CompanyInventors: Robert E. Hefner, Jr., Jimmy D. Earls
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Patent number: 5177157Abstract: A two-step process for the preparation of a silicone resin-modified phenolic resin is disclosed wherein an alkoxysilane-modified phenolic resin is first prepared by reacting an alkoxysilane with a phenolic resin. In a subsequent step, the alkoxysilane-modified phenolic resin is hydrolyzed and condensed by heating and stirring it with water. The resulting silicone resin-modified phenolic resin, which is free of diorganopolysiloxane units, has excellent heat resistance and excellent electrical insulating properties.Type: GrantFiled: August 23, 1990Date of Patent: January 5, 1993Assignee: Dow Corning Toray Silicone Co., Ltd.Inventor: Shoji Akamatsu
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Patent number: 5149730Abstract: An electrical encapsulation formulation is provided comprising a diglycidyl ether of a 4,4'-dihydroxybiphenyl, a trisphenolic curing agent, a cure accelerator and an inorganic filler. The composition cures rapidly and exhibits excellent resistance to cracking under high-temperature operation.Type: GrantFiled: June 13, 1990Date of Patent: September 22, 1992Assignee: Shell Oil CompanyInventors: Yasuyuki Murata, Isako Konishi, Ryohei Tanaka, Yoshinori Nakanishi
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Patent number: 5143950Abstract: An epoxy resin powder coating composition comprises 100 parts by weight of bisphenol A mixed epoxy resin having number average molecular weight from 1,700 to 4,500 comprising a bisphenol A epoxy resin (A) having a number average molecular weight from 2,500 to 8,000 and a bisphenol A epoxy resin (B) having a number average molecular weight from 300 to 1,000 (C) a novolak epoxy resin 5 to 20 parts by weight of polyvinyl butyral resin or polyviny formal resin, a hardener, and a filler.Type: GrantFiled: October 18, 1990Date of Patent: September 1, 1992Assignee: Somar CorporationInventors: Katugi Kitagawa, Akira Shinozuka
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Patent number: 5141815Abstract: A film-forming resin composition comprising(A) from 1 to 10 weight percent of a phenolic resin,(B) from 10 to 89 weight percent of an epoxy resin and(C) from 10 to 89 weight percent of a reaction product between a epoxy resin and a phosphoric or phosphonic acid or monoalkyl orthophosphate,based on the total weight of (A), (B) and (C), is very useful for coating metallic substrates. The cross-linked composition gives colorless coatings of high toughness, flexibility, adhesion and chemical resistance.Type: GrantFiled: December 12, 1989Date of Patent: August 25, 1992Assignee: The Dow Chemical CompanyInventor: Clive J. Rickett
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Patent number: 5141974Abstract: A composition is disclosed which comprises the reaction product of a diglycidyl ether of a 4,4'-dihydroxybiphenyl and a polyhydric phenol having an average of 2.3 to 10 hydroxyl groups per molecule. The described epoxy resin is particularly useful in phenolic-cured electrical encapsulation formulations.Type: GrantFiled: June 13, 1990Date of Patent: August 25, 1992Assignee: Shell Oil CompanyInventors: Isako Konishi, Yasuyuki Murata, Ryohei Tanaka, Yoshinori Nakanishi
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Patent number: 5140079Abstract: The products resulting from contacting an organic phosphine or arsine with an inorganic acid having a weak nucleophilic anion provide for relatively stable compositions when admixed with a compound containing an average of more than one vicinal epoxide group per molecule and which optionally contains a compound containing an average of more than one phenolic hydroxyl group per molecule.Type: GrantFiled: April 15, 1991Date of Patent: August 18, 1992Assignee: The Dow Chemical CompanyInventors: John W. Muskopf, Louis L. Walker, James L. Bertram
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Patent number: 5095053Abstract: A method for encapsulating microelectronic devices is provided using a heat curable epoxy composition having a monomeric or polymeric diaryliodonium hexafluoroantimonate salt. Curable compositions are also provided as well as encapsulated microelectronic devices.Type: GrantFiled: January 14, 1991Date of Patent: March 10, 1992Assignee: General Electric CompanyInventors: Erik W. Walles, James V. Crivello, John H. Lupinski
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Patent number: 5066693Abstract: Phenolic molding compositions, particularly useful as sheet molding compositions comprise: 1) a resole phenole resin, 2) a thickening agent selected from the group consisting of alkaline earth metal oxides or hydroxides and silanes, 3) a filler selected from the group consisting of clay, talc, and mixtures thereof, and 4) an epoxy resin.Type: GrantFiled: February 12, 1990Date of Patent: November 19, 1991Assignee: Occidental Chemical CorporationInventor: Manoj K. Gupta
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Patent number: 5064882Abstract: A heat curable composition is provided which is useful for encapsulating microelectronic devices using a heat curable epoxy composition having a diaryliodonium hexafluoroantimonate salt as a catalyst in combination with an effective amount of a free radical generating aromatic compound as a cocatalyst.Type: GrantFiled: January 25, 1991Date of Patent: November 12, 1991Assignee: General Electric CompanyInventors: Erik W. Walles, John H. Lupinski, James V. Crivello
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Patent number: 5049596Abstract: An epoxy resin based powder coating composition which comprises: (A) 100 parts by weight of a mixed epoxy resin having a softening point of 60.degree.-80.degree. C. which consists of 50 to 70 wt. % of a bisphenol A expoxy resin having a number-average molecular weight of 800 to 1,800 and 30 to 50 wt. % of a cresol novolak epoxy resin; (B) 5 to 80 parts by weight of a novolak resin; (C) 0.5 to 5 parts by weight of triphenylphosphine; (D) 60 to 200 parts by weight of an inorganic powder having an average particle size of 0.5 to 75 um; and (E) 0.01 to 2 parts by weight of a microfine silica powder having an average particle size of 1 to 100 nm.The epoxy resin based powder coating composition can be coated on electrical and electronic components at 90.degree.-100.degree. C. with retaining the high moisture resistance, storage stability and free-flowing properties.Type: GrantFiled: November 16, 1989Date of Patent: September 17, 1991Assignee: Somar CorporationInventors: Yoshihisa Fujimoto, Yoshihiro Motoki, Kazufumi Ueji, Kunio Imai
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Patent number: 5015675Abstract: A heat curable composition is provided which is useful for encapsulating microelectronic devices using a heat curable epoxy composition having a diaryliodonium hexafluoroantimonate salt as a catalyst in combination with an effective amount of a free radical generating aromatic compound as a cocatalyst.Type: GrantFiled: July 31, 1989Date of Patent: May 14, 1991Assignee: General Electric CompanyInventors: Erik W. Walles, John H. Lupinski, James V. Crivello
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Patent number: 5001174Abstract: An epoxy resin composition for semiconductor sealing which comprises, as essential components,(A) an epoxy resin comprising 50-100% by weight, based on total epoxy resin amount, of a polyfunctional epoxy resin represented by the formula (I) ##STR1## wherein n and m are each an integer of 0 or more, n+m=1-10, and R.sub.1, R.sub.2 and R.sub.3 which may be the same or different, are each selected from hydrogen atom, an alkyl group and a halogen atom, with the proviso that all of R.sub.1, R.sub.2 and R.sub.3 must not be hydrogen atom simultaneously,(B) a phenolic resin curing agent,(C) a silica filler, and(D) a curing accelerator.Type: GrantFiled: December 4, 1989Date of Patent: March 19, 1991Assignee: Sumitomo Bakelite Company LimitedInventors: Kenichi Yanagisawa, Naoki Mogi, Hironori Ohsuga, Hiroshi Shimawaki
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Patent number: 4959400Abstract: An epoxy resin composition having exceptional stability which is useful in the preparation of electrical laminates comprises an epoxy resin such as the diglycidyl ether of bisphenol A, an organic solvent, a polyhydric phenolic hardener and an acid having a pKa at 25.degree. C. of less than 2.5 or an ester or anhydride of such acid. The epoxy resin composition can also contain a bishenol or bisphenol derivative such as bisphenol A. In addition, an accelerator such as an alkyl substituted imidazole can also be added to the composition prior to its use as in the preparation of electrical laminates.Type: GrantFiled: August 24, 1989Date of Patent: September 25, 1990Assignee: The Dow Chemical CompanyInventor: Diane Sexton
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Patent number: 4933420Abstract: Epoxide compounds and phenolic compounds are reacted in the presence of phosphonium compounds represented by the formula .crclbar.Z'R.sup.1 R.sup.2 R.sup.3 P.sym.-Z-P.sym.R.sup.1 R.sup.2 R.sup.3 Z'.crclbar. wherein each R.sup.1, R.sup.2 and R.sup.3 is independently an aromatic group or an inertly substituted aromatic group; Z is --(C(R.sup.4).sub.2).sub.a --; each R.sup.4 is independently hydrogen or a hydrocarbyl group containing from 1 to about 20 carbon atoms; Z' is any suitable anion and a has a value of at least 4.Type: GrantFiled: September 23, 1988Date of Patent: June 12, 1990Assignee: The Dow Chemical CompanyInventors: Ha Q. Pham, Loan A. Ho
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Patent number: 4925901Abstract: Storage stable compositions are disclosed which comprise an epoxide containing compound, a phenolic hydroxyl containing compound, and a catalyst compound for catalyzing the reaction between epoxide groups and aromatic hydroxyl groups which catalyst comprises the product resulting from contacting an onium salt, amine, or amine salt with an acid or a salt of an acid having a weak nucleophilic anion.Type: GrantFiled: November 18, 1988Date of Patent: May 15, 1990Assignee: The Dow Chemical CompanyInventors: James L. Bertram, Louis L. Walker, John W. Muskopf
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Patent number: 4923912Abstract: An epoxy resin composition consisting essentially of(A) an epoxy resin,(B) a curing agent,(C) a curing promoter,(D) an organic silicon compound having at least one phenolic hydroxyl group per molecule, and(E) a filler.Type: GrantFiled: July 20, 1988Date of Patent: May 8, 1990Assignee: Mitsubishi Gas Chemical Company, Inc.Inventors: Yukio Sasaki, Takayuki Watanabe, Hiroshi Takamiya, Kazuo Watanabe, Yoko Yamazaki
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Patent number: 4904516Abstract: A process for preparing a water soluble phenol-formaldehyde resole resin having improved storage stability employs a calcium compound to catalyze the condensation reaction which occurs under basic conditions. Sulfamic acid is used to neutralize the resole solution, yielding a soluble calcium salt which will not settle out of the solution or clog transfer lines or spray nozzles as may a calcium salt precipitated during the neutralization. Glass fiber insulation produced using a binder prepared with the aqueous resole solution shows enhanced thickness recovery and lower odor potential.Type: GrantFiled: January 12, 1988Date of Patent: February 27, 1990Inventor: Albert W. Creamer
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Patent number: 4902759Abstract: According to the present invention there is provided a coating composition comprising from 30% to 70% by weight of a novolac-type phenolic resin having a melting point in the range of 70.degree.-130.degree. C. or resol-type phenolic resin having a gel time of at least 45 to 180 sec. at 180.degree.C.; and 70-30% by weight of a multi-epoxide group containing compound having at least 2 epoxide groups and having an epoxide equivalent weight of 100 to 1200.Type: GrantFiled: March 3, 1989Date of Patent: February 20, 1990Assignee: Holden Europe SAInventors: Maurice Vo-Than, George Chavasset
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Patent number: 4853279Abstract: A curable composition for a fiber-reinforced resin, comprises (A) 60-90 weight % of an epoxy-containing (meth)acrylate resin which contains an epoxy group and an unsaturated-monobasic acid ester group in its molecules and which is formed by the reaction of an epoxy resin containing at least two epoxy groups per molecule and having an epoxy equivalent of 100-1000 with an unsaturated-monobasic acid in an amount such that there are 0.2-0.7 equivalents of carboxyl groups per 1 equivalent of epoxy groups, (B) 40-10 weight % of a radical polymerizable monomer, (C) an organic peroxide, (D) a curing agent for the epoxy resin, and (E) one or more reinforcing materials selected from continuous fiber and fiber cloth.Type: GrantFiled: March 27, 1987Date of Patent: August 1, 1989Assignee: Showa Highpolymer Co., Ltd.Inventors: Jouji Shibata, Kazuo Ohtani, Norio Shinohara, Toshiaki Hanyuda
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Patent number: 4725652Abstract: Latent catalysts for epoxy reactions are prepared by reacting a tetrasubstituted onium compound such as tetrabutylphosphonium acetate.acetic acid complex or an amine compound with an acid having a weak-nucleophilic anion such as fluoboric acid. These catalysts provide stable latent catalysts for epoxy resins for advancement or curing reactions.Type: GrantFiled: March 4, 1987Date of Patent: February 16, 1988Assignee: The Dow Chemical CompanyInventors: James L. Bertram, Louis L. Walker, Van I. W. Stuart
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Patent number: 4719502Abstract: An epoxy resin composition for sealing, and a resin-sealed type semiconductor device in which this composition is used, of outstanding heat cycle resistance, humidity resistance and laser marking characteristics, can be obtained by using a combination of an organic phosphine compound and a metal complex dye. The epoxy resin composition, characterized in that it consists of epoxy resin, a curing agent having at least 2 phenolic hydroxyl groups per molecule, an organic phosphine compound and a metal complex dye; and to a resin-sealed type semiconductor device characterized in that it is sealed with this composition.Type: GrantFiled: August 4, 1986Date of Patent: January 12, 1988Assignee: Kabushiki Kaisha ToshibaInventors: Hirotoshi Ikeya, Michiya Higashi
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Patent number: 4711936Abstract: A curing agent for an epoxy resin comprises a cyclodextrin clathrate compound of a compound which is reactive with an epoxy group, a curing agent for an epoxy resin comprising a mixture of a cyclodextrin clathrate compound of a compound which is reactive with an epoxy group with a trace amount of amylase, and methods for the preparation of these curing agents. The curing agents are stable at room temperature, and the curing reaction is initiated under remarkably simple conditions.Type: GrantFiled: November 13, 1985Date of Patent: December 8, 1987Assignee: Japan Liquid Crystal Co., Ltd.Inventors: Ichiro Shibanai, Kenji Nakamura
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Patent number: 4617584Abstract: There is disclosed a highly reliable resin encapsulation type semiconductor device excellent humidity resistance as well as high temperature electric characteristics. The specific feature consists in the epoxy resin composition employed for encapsulation. This composition comprises a novolac type epoxy resin, a novolac type phenol resin, an organic phosphine compound and an organic phosphorus acid compound.The resin encapsulation type semiconductor device is markedly small in leak current under hot an humid conditions and has a prolonged life due to difficult deterioration through corrosion of electrodes and aluminum wiring, as compared with those of prior art.Type: GrantFiled: March 28, 1983Date of Patent: October 14, 1986Assignee: Tokyo Shibaura Denki Kabushiki KaishaInventors: Hirotoshi Ikeya, Akiko Hatanaka
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Patent number: 4611036Abstract: An epoxy resin composition having excellent handling properties, solvent resistance and heat resistance and particularly excellent low-temperature curability is provided which comprises (A) a polyfunctional epoxy resin having an epoxy equivalent of 160 to 2,000 obtained by reacting an epoxy resin having an epoxy equivalent of 100 to 800 with a molecular weight increasing agent containing 2.1 to 10 functional groups (phenolic hydroxyl groups) on an average per molecule and (B) a curing agent for the epoxy resin) as essential ingredients.Type: GrantFiled: December 10, 1984Date of Patent: September 9, 1986Assignee: Dainippon Ink and Chemicals, Inc.Inventors: Hisashi Sekiguchi, Norio Kobayashi, Hideo Ohgishi