Patents by Inventor Yukio Saeki
Yukio Saeki has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 5034370Abstract: A color developer for pressure-sensitive recording paper is produced by admising components comprising:(A) 100 parts by weight of a polyvalent metal salt of a co-condensation product of a substituted salicylic acid, an aromatic hydrocarbon and an aldehyde. Such a co-condensation product is obtained by reacting:(a) a substituted salicylic acid,(b) one or more aromatic hydrocarbons having 4 to 9 carbon atoms, and(c) an aldehyde of 1 to 8 carbon atoms, in the presence of an acidic catalyst; and(B) 5 to 200 parts by weight of one or more members selected from the group consisting of petroleum resins, terpene resins, modified terpene resins, coumaarone resins and modified coumarone resins.The color developer is excellent in color density, resistance to yellow staining, fastness to light of color images and resistance to fading in water of color images, and in addition is capable of forming color images at a markedly increased speed.Type: GrantFiled: December 8, 1989Date of Patent: July 23, 1991Assignee: Sumitomo Durez Company, Ltd.Inventors: Yukio Saeki, Yukio Tokunaga
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Patent number: 4920186Abstract: The present invention relates to a polyvalent metal-bound carboxyl-modified p-alkylphenol-mesitylene-formaldehyde resin composition produced by binding with a polyvalent metal a -alkylphenol-mesitylene-formaldehyde co-condensate containing a carboxyl group, to produce a color developer for pressure-sensitive recording paper.Type: GrantFiled: January 12, 1989Date of Patent: April 24, 1990Assignee: Sumitomo Durez Company, Ltd.Inventors: Yukio Tokunaga, Yukio Saeki
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Patent number: 4920185Abstract: The present invention relates to a polyvalent metal-bound carboxyl-modified p-substituted phenol-xylene-formaldehyde resin composition produced by binding with a polyvalent metal a p-substituted phenol-xylene-formaldehyde co-condensate containing a carboxyl group, to produce a color developer for pressure-sensitive recording paper. The polyvalene metal is selected from the group magnesium, aluminum, calcium, cadmium, zinc, nickel and manganese.Type: GrantFiled: January 27, 1989Date of Patent: April 24, 1990Assignee: Sumitomo Durez Company, Ltd.Inventors: Yukio Tokunaga, Yukio Saeki
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Patent number: 4870154Abstract: A method of producing a novolac phenolic resin having quick-curing properties and good fluidity is disclosed, whereby the novolac resin is prepared by reacting a phenol with an aldehyde using an acidic catalyst and thereafter adding an ammonium halide. The ammonium halide is added in amounts of about 0.05 to 3 wt % of the solid resin, and the conversion of aldehyde is not less than 90% and the water content of the resin is not less than 5%.Type: GrantFiled: November 20, 1987Date of Patent: September 26, 1989Assignee: Sumitomo Durez Company, Ltd.Inventors: Yukio Saeki, Toshiaki Nishimura, Kozuichi Ikeda
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Patent number: 4698370Abstract: A phenolic resin composite foam is disclosed which is prepared by heating and foaming a novolak phenolic resin having a number average molecular weight of 250 to 600 and a bulk density of 0.15 to 0.5, a blowing agent, a blowing auxiliary compound and inorganic foamed particles. Additional materials for flame retardancy can be added. The foam produced has a high compressive strength, a high foaming and rapid curing rates, a low water absorption and a minimum of friability.Type: GrantFiled: April 14, 1986Date of Patent: October 6, 1987Assignee: Sumitomo Durez Company, Ltd.Inventors: Yukio Saeki, Naomitsu Inoue, Yukio Tokunaga
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Patent number: 4694028Abstract: This invention is concerned with a method for producing phenol resin foam possessing a compact cellular structure, a high closed cell ratio and improved heat resistance. The method consists of using a resole type phenolic resin having a number average molecular weight of 150-400, surface active agents, blowing agents and curing agents, wherein at least two surface active agents are chosen from general formulas A and B, but a selection of each type must be employed ##STR1## where R.sub.1 is a saturated aliphatic hydrocarbon group of 8-14 carbon atoms and/or a 2-phenylpropyl group, and m and n are integers and meet the requirement: ##EQU1## R.sub.2 is a saturated aliphatic hydrocarbon group of 4-12 carbon atoms, M is a hydrogen atom or SO.sub.2 Na, and x is an integer of 4-110.Type: GrantFiled: April 5, 1986Date of Patent: September 15, 1987Assignee: Sumitomo Durez Company, Ltd.Inventors: Yukio Saeki, Naomitsu Inoue, Yukio Tokunaga
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Patent number: 4529751Abstract: A phenolic resin for application in foundry shell molding operations having improved properties is disclosed. The phenolic resin is prepared by reacting aldehydes and a mixture of bisphenol A and bisphenol F to prepare a phenolic resin for coating foundry aggregates or sand to prepare shell molds having low thermal expansion and improved shake out properties.Type: GrantFiled: October 17, 1983Date of Patent: July 16, 1985Assignee: Sumitomo Durez Company, Ltd.Inventor: Yukio Saeki
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Patent number: 4468486Abstract: A resin coated sand for shell-molding processes is provided comprising the coating of foundry sand or aggregates with a phenolic resin and a carboxylic acid salt. The carboxylic acid salt is selected from a carboxylic acid salt of an element selected from groups Ia, Ib, IIa, IIb, IIIa, IVa, Va, VIb, VIIa, VIIb or VIII of the Periodic Table of Elements. The proportion of carboxylic acid salt to phenolic resin is from 0.5 to 40 parts carboxylic acid salt to 100 parts phenolic resin. This resin coated sand produces shell-molds having excellent properties for casting, and allows the molded article to be removed in an easy and efficient manner.Type: GrantFiled: November 2, 1982Date of Patent: August 28, 1984Assignee: Sumitomo Durez Company, Ltd.Inventors: Noriaki Matsushima, Yukio Saeki, Yukio Tokunaga
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Patent number: 4460717Abstract: A resin coated sand for shell-molding foundry operations having improved shake-out properties for molds prepared therefrom is disclosed. Also disclosed are methods of producing said sand. The foundry aggregates or sand are coated with a phenolic resin containing from 0.2 to 40 parts of an aromatic nitro compound per 100 parts of phenolic resin. The resin may be a novolac type, a resole type or a mixture of the two types of phenolic resins. Suggested aromatic nitro compounds are nitrophenols, dinitrophenols and nitronaphthalenes. The process is extremely useful for coating lower melting temperature metals such as aluminum and magnesium.Type: GrantFiled: June 16, 1983Date of Patent: July 17, 1984Assignee: Sumitomo Durez Company, Ltd.Inventors: Yukio Saeki, Shigeru Nemoto, Yukio Tokunaga
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Patent number: 4460716Abstract: A process for preparing resin coated sand for shell molding foundry operations is disclosed wherein the resin utilized is a phenolic resin containing a bromophenol. The resin coated sand has improved shake-out properties and is especially formulated for low melting metals such as aluminum and magnesium castings.Type: GrantFiled: June 16, 1983Date of Patent: July 17, 1984Assignee: Sumitomo Durez Company, Ltd.Inventors: Yukio Saeki, Shigeru Nemoto, Yukio Tokunaga
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Patent number: 4459376Abstract: A process for the preparation of a resin-coated sand for use in shell-molding operations wherein the molding operation is designed for metals such as aluminum, magnesium and their alloys which have a lower-melting temperature than iron. The process involves the coating of foundry sand with a phenolic resin incorporating a carbonate and/or bicarbonate of elements selected from groups Ia, IIa, IIIb, IVb, Vb, VIb, VIIb or VIII. This process produces a resin-coated sand with improved shake-out properties of the casting molds.Type: GrantFiled: October 19, 1982Date of Patent: July 10, 1984Assignee: Sumitomo Durez Company, Ltd.Inventors: Noriaki Matsushima, Yukio Saeki, Yukio Tokunaga
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Patent number: 4459377Abstract: An improved resin coated sand for use in foundry shell-molding applications is disclosed which has increased resistance to thermal shock at the time of pouring. The improved product uses a phenolic resin as binder with aromatic compounds selected from the following generic formulae: ##STR1## wherein m, n, x and y are integers. The foundry aggregates are mixed with the phenolic resin and organic compounds under conventional mixing conditions to form a sand-resin mixture that can be formed into shell-molds. Upon casting the molten metal into these molds, the abrupt thermal expansion of the coated sand is controlled to eliminate the cracking that occurs when conventional phenolic-sand mixtures are employed.Type: GrantFiled: March 28, 1983Date of Patent: July 10, 1984Assignee: Sumitomo Durez Company, Ltd.Inventors: Yukio Saeki, Tosaku Amakawa, Shigeru Nemoto
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Patent number: 4459375Abstract: An improved resin coated sand for use in foundry shell-molding applications is disclosed which has increased resistance to thermal shock at the time of pouring. The improved product uses a phenolic resin as binder with aromatic compounds selected from the following generic formulae: ##STR1## The foundry aggregates are mixed with the phenolic resin and organic compounds under conventional mixing conditions to form a sand-resin mixture that can be formed into shell-molds. Upon casting the molten metal into these molds, the abrupt thermal expansion of the coated sand is controlled to eliminate the cracking that occurs when conventional phenolic-sand mixtures are employed.Type: GrantFiled: March 28, 1983Date of Patent: July 10, 1984Assignee: Sumitomo Durez Company, Ltd.Inventors: Yukio Saeki, Yukio Tokunago
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Patent number: 4452926Abstract: An improved resin binder for shell-molding operations having improved shake-out properties is disclosed. The resin binder utilizes a lubricant-containing phenolic resin of the novolac or resole type, or a mixture of novolac and resole types, incorporated therewith is an organic chloride. The organic chloride is characterized by having 20% by weight of the heating loss in the temperature range of 130.degree. to 550.degree. C. The organic chloride may be selected from chloride-containing polymers and cyclo-organic chlorides. Chlorinated polymeric material may be selected from polyvinyl chlorides, polyvinyldene chloride resins, chlorinated paraffins and chlorinated polyolefins.Type: GrantFiled: November 5, 1982Date of Patent: June 5, 1984Assignee: Sumitomo Durez Company, Ltd.Inventors: Noriaki Matsushima, Yukio Saeki, Hajime Kirabayashi
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Patent number: 4452927Abstract: Resin coated sand for foundry shell molding operations is provided which eliminates the cracking of the molds at the time of pouring. In conventional phenolic bonded sand molds, the abrupt thermal expansion caused by the pouring of the molten metal into the mold causes the mold to crack. The resin coated sand, in this invention, is composed of foundry sand or aggregates coated with a phenolic resin which has incorporated therein, a polyethylene glycol of high molecular weight. This improved coated sand eliminates cracking at pouring and does not impair the shake-out property of the molds.Type: GrantFiled: January 5, 1983Date of Patent: June 5, 1984Assignee: Sumitomo Durez Company, Ltd.Inventors: Noriaki Matsushima, Yukio Saeki, Yukio Tokunaga
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Patent number: 4426484Abstract: The cure of resin compositions comprising a mixture of a resole type phenol aldehyde resin and a novolac type phenol formaldehyde resin is improved by employing resorcinol as all or part of the phenolic component in the novolac type resin. The resin compositions are particularly useful as binders for foundry sand.Type: GrantFiled: October 14, 1981Date of Patent: January 17, 1984Assignee: Sumitomo Durez Company, Ltd.Inventors: Yukio Saeki, Katsuyuki Tanaka
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Patent number: 4419477Abstract: This invention relates to a powdered phenolic resin composition suitable for the production of dry processed resinbonded felt. The phenolic resin composition imparts a good release of the felt from the heated platen or belt and has a rapid cure rate. The powdered phenolic composition is composed of a novolac type phenolic resin, or a mixture of novolac and resole type with an aromatic carboxylic acid as an additive. The resin mixture has a bulk density of 0.29-0.36 gm/cm.sup.3, and contains 0.3-5 parts by weight of the aromatic carboxylic acid to 100 parts by weight of phenolic resin. Said aromatic carboxylic acid has the formulaR--Ar--COOHwhereinR is selected from hydrogen, hydroxy or alkoxy groups, andAr is selected from phenyl, phenylalkenyl or phenylalkyl groups.Type: GrantFiled: September 30, 1982Date of Patent: December 6, 1983Assignee: Sumitomo Durez Company, Ltd.Inventors: Yukio Saeki, Naomitsu Inoue
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Patent number: 4418161Abstract: This invention relates to a method for the production of an improved resin coated lubricated sand for use in shell molding processes, wherein the resin coated sand is especially useful in casting operations using aluminum, magnesium and their alloys.The sand is coated with a phenolic type resin containing a lubricant and an additive to assist in the thermal decompositions of the binder to provide a more efficient removal of the sand grains. The additive is an organic bromide compound of the type: ##STR1## wherein: n and m are integers 0, 1 or 2, and n and m cannot be O at the same time.B.sub.r position is ortho to --oxx is selected from: --H, --C.sub.2 H.sub.4 OH, --CH.sub.2 -- CH.dbd.CH.sub.2 and --CH.sub.2 --CH BR--CH.sub.2 BR.Type: GrantFiled: August 20, 1982Date of Patent: November 29, 1983Assignee: Sumitomo Durez Company, Ltd.Inventors: Noriaki Matsushima, Yukio Saeki, Yukio Tokunaga
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Patent number: 4166166Abstract: Phenolic novolak resins are produced from acetophenone, particularly by-product acetophenone obtained from the cumene process for manufacturing phenol, by the process of (1) reacting acetophenone with an aldehyde under alkaline conditions, and (2) reacting the product of step (1) with a phenol under acidic conditions. Phenolic resole resins are produced by reacting the product of step (2) with an aldehyde under alkaline conditions. The acetophenone modified phenolic resins are useful as a molding material, a felting or batting binder, a grinding stone binder, a foundry sand binder and an adhesive for timbers.Type: GrantFiled: October 2, 1978Date of Patent: August 28, 1979Assignee: Sumitomo Durez Company, Ltd.Inventors: Nobutaka Nakamura, Yukio Saeki
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Patent number: 4125502Abstract: Adhesive compositions comprising a mixture of polyvinyl acetate and an alcohol soluble resol phenolic resin and about 2 to 20 parts by weight of lower polyhydric alcohol per 100 parts by weight of the resin solids have enhanced binding strengths on curing even after a prolonged open assembly time.Type: GrantFiled: December 29, 1975Date of Patent: November 14, 1978Assignee: Sumitomo Durez Company, Ltd.Inventors: Nobutaka Nakamura, Yukio Saeki