baber/WOPTO huggingface dataset:
Patent JP-H03256039-A (JP)
Title: Antistatic layer
Inventor: TACHIBANA NORIKI
IPC: C08G59/18
Filed: 1990-12-13
Abstract: PURPOSE:To obtain the antistatic layer for a plastic film excellent in transparency and antistatic effect and free of haze even when rapidly dried by incorporating an ethylene oxide chain and/or an amide group into a hydrophobic polymer. CONSTITUTION:An antistatic layer is formed from the reaction product of a water-soluble conductive polymer, hydrophobic polymer grains and an epoxy- based curing agent, and an ethylene oxide chain and/or an amide group are incorporated into the hydrophobic polymer. A polymer having at least one conductive group selected from a sulfonic group, a sulfuric ester group, a quaternary ammonium salt, etc., is exemplified as the water-soluble conductive polymer. The number average mol.wt. of the hydrophobic polymer is preferably controlled to >=3,000, and a difference in transparency between mol.wts. is hardly caused. Consequently, the antistatic layer of a silver halide photosensitive material excellent in transparency after coating and without its antistatic effect being deteriorated after development is obtained.
Patent JP-H04218144-A (JP)
Title: Ultrasonic probe
Inventor: SUGISHIMA KENJI
IPC: A61B8/12
Filed: 1990-12-18
Abstract: PURPOSE:To ensure power resolving performance along with a smaller size pertaining to an ultrasonic probe which detects the reflected wave of an ultrasonic wave generated intermittently within a microtube to inspect internal condition thereof. CONSTITUTION:Thin film electrodes 8 and 11 are formed on a rotor 6 of a motor for turning a reflecting mirror 7 and a stator 10. Then, the reflecting mirror 7 is integrated with the rotor 6 (the electrode 8 for rotation). A reflecting mirror surface is provided with a reflecting surface altering means 16 or an ultrasonic vibrator 3 is provided with a vibrator altering means 21 to vary a focus position of an ultrasonic beam 9 projecting.
Patent JP-H04219631-A (JP)
Title: Optical disk medium driving device
Inventor: MATOBA KOJI
IPC: G11B7/085
Filed: 1990-12-19
Abstract: PURPOSE:To accurately carry out discrimination of land (track) and groove even when ODF part where a part of the groove (guide groove) is broken exists in the optical disk. CONSTITUTION:An envelope signal 55 is generated to obtain the envelope of a total signal 45 showing a total quantity of reflected light from the optical disk 24. The ODF part 28 is detected by deriving this envelope signal 55, a constant is reduced when discharging is carried out by a condenser C1 in an envelope detection circuit 57 when the ODF part 28 is detected and the rising time of the envelope signal 55 is shortened at the time the ODF part 28 is passed. Furthermore, by removing minute width pulse responding to the ODF part 28 remaining in a binary envelope signal 68 based on the ODF part detection signal 56, a land/groove discrimination signal 72 discriminating the land and the groove is generated.
Patent JP-H04220727-A (JP)
Title: Vectorization processing system
Inventor: NAKANOYA OSAMU
IPC: G06F9/45
Filed: 1990-12-21
Abstract: PURPOSE:To shorten the program execution time of a vector processor by vectorizing a character substitute statement which are not vectorized before. CONSTITUTION:A compiler 2 consists of a syntax analysis part 22 and a code generation part 23. A vectoization part 22 is equipped with a condition decision part 221 which decides whether or not the character substitute statement meet conditions of parallel execution and a loop constitution part 222 which regards the character substitute statement meeting the conditions as an array of integer types and makes the substitute statement into a loop, which is executed by the repetition of each element of the array of integer types, to constitute a 2nd intermediate text 25. Consequently, the character substitute statement can be vectorized so that a source program is processed in a parallel executable state.
Patent JP-H04209773-A (JP)
Title: Production of porous glass-like carbon material
Inventor: HAINO KAZUYOSHI
IPC: C04B38/06
Filed: 1990-12-06
Abstract: PURPOSE:To provide the carbon material always having good porosity and excellent skeletal strength by continuously producing a sheet from an alpha-cellulose water dispersion containing a specific binder, treating the sheet with a thermosetting resin and subsequently calcination-carbonizing the treated product. CONSTITUTION:The water dispersion of a raw material composition comprising 60-90 pts.wt. of an organic substance containing alpha-cellulose as a main component, 10-40 pts.wt. of a water-soluble paper binder and 1-10 pts.wt. of a water-soluble and thermally volatile binder is continuously processed into a sheet. The sheet is continuously immersed in a thermosetting resin solution having a carbon residue degree of >=40% and subsequently squeezed with rolls. The treated sheet is semi-cured and subsequently calcination-carbonized at a temperature of >=800 deg.C in a non-oxidative atmosphere to provide the objective carbon material. Since the above production process permits the reduction in the cost for the production due to an mass production effect, the carbon material is extremely effective as a material for fuel batteries and secondary batteries requiring not only good heat resistance and corrosion resistance but also low costs.
Patent JP-H04223335-A (JP)
Title: Manufacture of dielectric thin film
Inventor: MATSUNAGA KOJI
IPC: H01L49/02
Filed: 1990-12-26
Abstract: PURPOSE:To easily form the title dielectric thin film having a large area at low cost by a method wherein a laminated metallic thin film of two or more layers having a tantalum metal on the topmost layer is oxidized by anode- oxidization step. CONSTITUTION:A multilayer structure formed by anode oxidization step is composed of four layers comprising a tantalum oxide thin film 1, the other element oxide thin film 2, another tantalum oxide thin film 3 and the other element oxide thin film 4. In such a constitution, after evaporating gold/chrome thin films 6, 7 used as electrodes on a glass substrate 5, the constituent metals are successively laminated by multielement high-frequency magnetron sputter step specifying the tantalum metal as the fourth layer. In general, the volume of a metal is to be expanded for increasing the film thickness when it is anode- oxidized. After performing the four layer lamination step, oxalic acid is used as a chemical-conversing solution to form all of the layers into oxides excluding gold/chrome electrodes. After drying-up step, aluminum electrodes 7 are evaporated to form capacitors.
Patent JP-H04225622-A (JP)
Title: Frequency synthesizer
Inventor: IZUMI ISAO
IPC: H03L7/18
Filed: 1990-12-27
Abstract: PURPOSE:To eliminate the out-of-synchronism or the out-of-phase of a PLL loop due to the charge and discharge current of a capacitor constituted in a loop filter, and besides, to reduce a noise after switching at the time when frequency is switched at high speed. CONSTITUTION:The device is a frequency synthesizer provided with a phase locked circuit constituted of a voltage controlled oscillator 1, a reference oscillator 3, a pulse swallow counter 2, a phase comparator 5, a charge pump circuit 6, and the loop filter 7 to use a wide-band loop filter or a narrow-band loop filter by switching them, and it is provided with a high speed charge and discharge circuit 11 to charge and discharge the capacitor in the narrow-band loop filter at high speed by the control signal of the charge pump circuit 6.
Patent JP-H04231184-A (JP)
Title: Device for laser marking
Inventor: UEDA SUSUMU
IPC: B23K26/00
Filed: 1990-12-28
Abstract: PURPOSE:To prevent the dust from contaminating the working room or the other disks, whose dust is generated at the time when the disks are worked with laser marking in the clean room, and also to miniaturize the working room, to make the cost low and to make the working speedy. CONSTITUTION:Plural pieces of the disks are set parallel on the horizontal same axis in the clean working room, and the case that each disk are stored so as to be able to be taken to the vertical direction and it is freely movable to advance straightly to the horizontal same axial direction, the push up device to push one disk up by the prescribed stroke selectively, the dust sucking head whose opening part is approached oppositely nearby the under side of the marking area of one disk pushed up, and the laser maker which is located in the out door of the working room and radiates the marking area of one disk through the light transmissible body of the outer wall of working room are provided.
Patent JP-H04233007-A (JP)
Title: Numerical controller
Inventor: OTA KEIICHI
IPC: G05B19/4155
Filed: 1990-12-28
Abstract: PURPOSE:To present the numerical controller, which can shorten work cycle time, by realizing simultaneous control to independently set the moving speed of each control axis. CONSTITUTION:A mode discrimination part 14 discriminates whether the number of axis moving speed commands set to the same block of a work program to be read for each block is one or plural for each axis. When the axis moving speed command is one, the respective axes are synchronously moved by a synchronous control arithmetic part 18 so that the synthesized moving speed of the plural control axes can be equal to the commanded moving speed. On the other hand, when there are the plural axis moving speed commands, a simultaneous control arithmetic part 32 independently moves the above-mentioned plural control axes at the speed commanded for each axis from a starting point to an ending point set for each axis.
Patent JP-H04214591-A (JP)
Title: Driving system of discharge type display device
Inventor: YANO YOUJIROU
IPC: H01J11/14
Filed: 1990-12-12
Abstract: PURPOSE:To allow high-speed charge transfer by eliminating the need for a blanking period at every one field and to allow stable charge transfer by forming an auxiliary cathode into a dielectric structure. CONSTITUTION:A pilot discharge is generated by using the auxiliary anode pulses to an auxiliary anode 3a and the auxiliary cathode pulses to the auxiliary cathode 11 of the dielectric structure before the data writing operation of the top line in the driving system of the discharge type display device which displays information on a display cell by the discharge between electrodes. The space charges and wall charges formed by this pilot discharge are then successively transferred from the top line by using charge transfer pulses.
Patent JP-H05315531-A (JP)
Title: Lead frame and manufacture thereof
Inventor: SHIMIZU MITSUHARU
IPC: H01L23/50
Filed: 1990-12-25
Abstract: PURPOSE:To provide a frame and manufacturing method capable of properly high densifying the lead frame as well as cutting down the manufacturing cost thereof. CONSTITUTION:A holding lead frame 50 having specific inner leads 52 properly spacing out for the arrangement of a stage is formed, on the other hand, a thin film lead frame having connecting leads 32 for connecting the ends of the inner leads 52 to the peripheral parts of the stage is formed. Next, a radiator plate 40 serving both as the stage electrically insulated from the connecting leads 32 of the thin film lead frame is bonded to be held so that the radiator plate 40 junctioned with the connecting leads 32 may be aligned with the inner leads 52 of the holding lead frame 50 to junction respective connecting lead 32 with the inner leads 52.
Patent JP-H04225765-A (JP)
Title: Heat exchanger
Inventor: ONO SUSUMU
IPC: F28F3/14
Filed: 1990-12-27
Abstract: PURPOSE:To offer a heat exchanger where refrigerant circuits of adjacent roll-bond panels can be easily connected. CONSTITUTION:Each of two or more roll-bond panels 2 and 3 has a refrigerant circuit 5 that is extended from one end 7 to the other end 6 in the direction of rolled length. The roll-bond panels 2 and 3 are joined in the direction of rolled width to form a heat exchanger 1. Inlets 8 and outlets 9 of the refrigerant circuits 5 of the roll-bond panels 2 and 3 are formed together in the vicinity of the ends 7, and the inlets 8 and the outlets 9 of the adjacent roll-bond panels 2 and 3 are joined in the vicinity of the ends 7.
Patent JP-H04136394-A (JP)
Title: Shaft drillig rig
Inventor: KAAKU MAKUBURAIDO SHINKUREA
IPC: E21D1/06
Filed: 1990-12-28
Abstract: PURPOSE: To remove chips with a dry method by providing two air compressors and a dust collector to a shaft drilling device constituted of a bottom drill assembly body consisting of a cutterhead and weights in a detachable manner, a swivel joint and a stabilizer. CONSTITUTION: A drilling device 10 is constituted of a bottom drill assembly body 28, a swivel joint 26, a drill string 20 and a stabilizer 34. The bottom drill assembly body 28 is constituted of a cutterhead 12, a plenum 14 and a plurality of weights 16 in a detachable manner. A first compressor 36 is provided to the drilling device, compressed air thereof pushes down the cutterhead 12 through the drill string 20, and a riser pipe 18 is made in a state of vacuum by a second compressor through a dust collector 40 to absorb cuttings. By the constitution, the cuttings are stirred with an air nozzle 42, and the cuttings can be removed to the dust collector 40 in a state of vacuum from an inlet 52 through the riser pipe 18 and an outside bore 58.
Patent JP-H04230436-A (JP)
Title: Rear part structure of room in automobile
Inventor: AOKI HIDEKI
IPC: B60N2/02
Filed: 1990-12-28
Abstract: PURPOSE:To improve a feeling as a 2-seater car by providing arm rests successively in line with both right/left ends of a seat cushion and also constituting a side trim possible to be raised/collapsed corresponding to the seat cushion so as to eliminate a feeling of a rear seat existing when only a front seat is used. CONSTITUTION:A rear seat RS of a 3-door hatch back car comprises a seat cushion 2 and a seat back 3. The rear of the seat-back 3 serves as a baggage chamber 4. Further in the baggage chamber 4, its upper is coated with a rear tray 5. In the above constitution, an arm rest 6, which functions as the first member, is integrally provided in right/left end parts of the seat cushion 2. On the other hand, a side trim 8 in a part corresponding to the seat cushion 2 of car room side walls is provided partially possible to be raised/collapsed. The side trim 8 is placed flush with a car room side wall surface when collapsed and, further almost horizontal, when raised, to function as the second member.
Patent JP-H04225705-A (JP)
Title: Proportional control type atomizer burner
Inventor: KOYAMA HIROYUKI
IPC: F23N1/02
Filed: 1990-12-26
Abstract: PURPOSE:To carry out combustion under a constant proper air condition by creating an optimum air supply environment to a change in a supply amount of fuel in a wide range. CONSTITUTION:Secondary air A2 and three dimensional air A3 are supplied into a combustion chamber from a clearance between an inner cylinder 11 and an outer cylinder 12 of a combustion cylinder 10. A freely rotatable auxiliary cylinder 14 having an open hole H4 is combined with the inner cylinder 11 having air holes H2 and H3 which are equivalent to H4. The rotation position of the aforesaid auxiliary cylinder 14 is adapted to be automatically adjustable in conformity with a supply amount of fuel so that the opening degree of the air holes H2 and H3 of the inner cylinder 11 may be changed in conformity with the supply amount of fuel.
Patent JP-H04216387-A (JP)
Title: Air system mechanism for magnetic tape device
Inventor: IKEBE HIROJI
IPC: G11B15/70
Filed: 1990-12-13
Abstract: PURPOSE:To prevent static electricity caused by the contact of a magnetic tape with a tape transport surface, which occurs due to the fluctuation of air pressure and the change of a tape speed in an air system mechanism for magnetic tape device, and to reduce the effect of the static electricity on recording and reproducing. CONSTITUTION:By providing an ionization filter 7 for ionizing air between a plenum 6 and a magnetic head 8 in the air system mechanism for the magnetic tape, the static electricity generated on the tape transport surface is neutralized by the synthesis with ion and eliminated. Dust attracted by the static electricity is removed, and the reliability of recording and reproducing is improved.
Patent JP-H04209635-A (JP)
Title: Polyester film having rough surface
Inventor: EDOUIN SHII KARUBAATOSON
IPC: C08J7/046
Filed: 1990-12-18
Abstract: PURPOSE: To obtain a polyester film having a nodular surface, low in the coefficient of friction and useful as a base plate such as a magnetic tape, by applying a predetermined acryl coating to at least one surface of a stretched polyester film under a specified condition.  
     CONSTITUTION: In the stretched polyester film, the acrylic coating composition is applied as an aq. emulsion consisting of 80-97.9 wt.% of methyl methacrylate terpolymer consisting of 60-90 mol.% of methyl methacrylate, 10-35 mol.% of one or more modifier selected from among ethyl, propyl and butyl acrylates and 1-10 mol.% of one or more comonomer selected from (N-methylol) (meth) acrylamide, 2-15 wt.% of a nonionic surfactant (e.g.; octylphenol ethoxylate) and about 0.1 wt.% of an anion surfactant (e.g.; sodium lauryl sulfate), to at least one surface of the stretched polyester film to form acryl coating being the dry residue of the emulsion characterized by islands built up from the surface of the film in the min. surface area of about 5%. 
     COPYRIGHT: (C)1992,JPO
Patent JP-H01502177-A (JP)
IPC: B60C/
Filed: 1987-11-17
Abstract: PCT No. PCT/FI87/00154 Sec. 371 Date Aug. 24, 1988 Sec. 102(e) Date Aug. 24, 1988 PCT Filed Nov. 17, 1987 PCT Pub. No. WO88/03876 PCT Pub. Date Jun. 2, 1988.The invention concerns a fixed spike or a sleeve-mounted spike, fitted on a vehicle tire. The fixed spike or sleeve-mounted spike (20) has been so shaped that when the spike is in its state at rest, its region (A) in contact with rubber (14) is substantially smaller than the total surface area of the respective region of the spike. Flow, caused by the visco-elastic properties of the rubber (14), of the rubber (14) around the fixed spike or the sleeve-mounted spike (20), is arranged to soften the first contact between the tip (23) of the fixed spike or rivet (21) of the sleeve-mounted spike (20) and the road surface.
Patent JP-S58501926-A (JP)
Title: 電気コネクタ
IPC: H01R12/87
Filed: 1982-11-08
Abstract: (57)【要約】本公報は電子出願前の出願データであるため要約のデータは記録されません。
Patent JP-S61500911-A (JP)
IPC: A61K6/90
Filed: 1984-12-20
Abstract: A two part impression material suitable for use as a dental impression material comprises a first part containing a product of the reaction of an alpha, beta-ethylenically unsaturated dicarboxylic acid anhydride, such as maleic anhydride, and a liquid polydiene resin, e.g polybutadiene, and a second part containing a setting agent for the reaction product which setting agent is an alkoxylated fatty mono- amine or an alkoxylated fatty polyamine having from 2 to 30, preferably 5 to 15 moles of alkoxylate per mole of the fatty amine. The alkoxylate groups of the setting agent being one or more groups selected from the group comprising ethoxylate, propoxylate and butoxylate groups. A method of taking a dental impression using the reaction product of the first and second parts of the two part dental impression, material is also disclosed.
Patent JP-S56501811-A (JP)
IPC: B01D53/34
Filed: 1980-12-22
Abstract: Nitrogen oxide pollutants are substantially reduced and sulfur dioxide minimized in multisolid fluidized beds by staged combustion of the fuel. The lower combustion region is operated at substoichiometric conditions such that NOx is reduced by carbon and carbon monoxide to nitrogen gas. The upper combustion region is operated at excess oxygen conditions to complete the combustion of char and carbon monoxide. Elevated temperature excursions in the upper region which deter sulfur capture are prevented by recycling cool entrained bed particles therethrough.
Patent JP-H09501820-A (JP)
Title: 半径方向磁界電気マイクロモータ、このマイクロモータに用いる円筒状本体、このマイクロモータの製造方法及び軸線方向電気マイクロモータ
IPC: H02K1/16
Filed: 1995-05-17
Abstract: (57)【要約】
電気マイクロモータは、固定子巻線と、回転子軸線（１３）の回りを回転するように載せ置かれるとともに固定子巻線に対向する永久磁石極を有する回転子磁石（１１）と、固定子巻線を電源に電気的に接続する電気的接続手段とを具える。固定子巻線を、長手方向スロットを設けた導電円筒状壁を有する円筒状本体（１）によって形成し、長手方向スロットが、円筒状本体の軸線端面（１５）から本体の長さの少なくとも一部に亘って延在して、永久磁石極と共同する軸線方向に延在する導電体（５）と境界を形成する。導電体を、スロットの一で電気的な絶縁補強手段（１９）によって機械的に相互接続する。
Patent JP-S61500861-A (JP)
Title: フィルタトラップ再生装置
IPC: B01D46/42
Filed: 1983-12-27
Abstract: (57)【要約】本公報は電子出願前の出願データであるため要約のデータは記録されません。
Patent JP-H01501834-A (JP)
Title: 被調整交流／直流変換装置
IPC: H02M3/335
Filed: 1987-12-21
Abstract: (57)【要約】本公報は電子出願前の出願データであるため要約のデータは記録されません。
Patent JP-H04502314-A (JP)
Title: 新規ｔｎｆペプチド
IPC: C07K7/06
Filed: 1989-12-02
Abstract: (57)【要約】本公報は電子出願前の出願データであるため要約のデータは記録されません。
Patent JP-S61501445-A (JP)
IPC: B65G15/58
Filed: 1985-03-14
Abstract: PCT No. PCT/SE85/00121 Sec. 371 Date Nov. 12, 1985 Sec. 102(e) Date Nov. 12, 1985 PCT Filed Mar. 14, 1985 PCT Pub. No. WO85/04152 PCT Pub. Date Sep. 26, 1985.The present invention relates to an arrangement in a sealing machine through which there extends at least one conveyor (2,3,8,9), which has a plurality of constraining means (19) at predetermined spacing in the conveying direction for packages (7), which are intended to be sealed in the sealing machine after they have been filled. The conveying means comprises one or more belts (5,6,10,11) side by side and in the same plane and said constraining means comprises perforations (19) in the belts, the openings of the perforations facing towards the interior of the conveyor being in communication with a vacuum source and the openings facing towards the carrying surface of the conveyor being intended for coaction with the underside of the packages (7) placed on the conveying means and in that the packages (7) are located on the conveyor belt during conveying through the sealing machine with the aid of the suction achieved via the perforations (19) with the aid of the vacuum.
Patent JP-S58500923-A (JP)
Title: アンテナ塔組立体及び方法
IPC: E04H12/18
Filed: 1982-05-07
Abstract: (57)【要約】本公報は電子出願前の出願データであるため要約のデータは記録されません。
Patent JP-2000512671-A (JP)
Title: マイクロカプセル化香料及び調製方法
IPC: A23L27/00
Filed: 1997-06-12
Abstract: (57)【要約】
本発明はカプセル化香料を提供し、該香料は所定のpHの溶液に該カプセル化香料をさらすことによって放出されるようにコントロールされる。本発明はまた、カプセル化香料を調製する工程を企図する。
Patent JP-H01501928-A (JP)
Title: ロツク防止調整装置
IPC: B60T8/32
Filed: 1987-03-25
Abstract: (57)【要約】本公報は電子出願前の出願データであるため要約のデータは記録されません。
Patent JP-H05505830-A (JP)
IPC: A61K31/495
Filed: 1991-12-20
Abstract: The new use of antagonists of the AMPA receptor complex and its physiologically compatible salts as pharmaceutical agents for prevention and treatment of Parkinson's disease as well as pharmaceutical agents, which contain these compounds, is described.
Patent JP-H04506464-A (JP)
Title: 運動器具
IPC: A63B22/16
Filed: 1990-01-26
Abstract: (57)【要約】本公報は電子出願前の出願データであるため要約のデータは記録されません。
Patent JP-H01502596-A (JP)
Title: ベルトとドラムによるプレス装置及びその加熱ドラム
IPC: D21F3/04
Filed: 1987-03-31
Abstract: (57)【要約】本公報は電子出願前の出願データであるため要約のデータは記録されません。
Patent JP-H09501076-A (JP)
Title: 洗浄性が向上したカミソリヘッド
IPC: B26B21/22
Filed: 1993-08-16
Abstract: (57)【要約】
波形部によって分離された複数の刃のプラットフォームと、切断縁を有する少なくとも１つの刃と、刃のプラットフォームと一体的に形成され刃の上面上に隣接した位置に伸びている複数の刃のリテーナとを有する一体的に形成された可撓性カミソリヘッド。刃のリテーナは可撓性のカミソリヘッドの他の部分に一体的に形成されるが、刃の各リテーナは、他の刃のリテーナとは分離している。
Patent JP-2000515963-A (JP)
Title: 核燃料組立て体
IPC: G21C3/328
Filed: 1997-05-30
Abstract: (57)【要約】
本発明は、沸騰水型原子炉用の燃料組立て体であって、該原子炉の作動の間、水が該燃料組立て体を通して上方に流れ、一方複数の燃料棒から熱を吸収することによって水の一部が蒸気に変換されるようにしうる燃料組立て体に関する。燃料組立て体は燃料組立て体を通して蒸気がその中を貫流する蒸気チャネルを含む。蒸気チャネル１６ａ，１６ｂ，１６ｃ，１６ｄは少なくとも燃料組立て体の一部を通して延びている空間から構成されている。燃料組立て体は、水と蒸気とが蒸気チャネルの周りで回転するようにされ、そのため水が投げ飛ばされて蒸気チャネルから離れ、一方水から分離された蒸気が蒸気チャネルを上方に貫流するように構成されている。
Patent JP-S58501928-A (JP)
Title: 衝突レ−ザ−
IPC: H01S3/223
Filed: 1982-09-27
Abstract: (57)【要約】本公報は電子出願前の出願データであるため要約のデータは記録されません。
Patent JP-H11507976-A (JP)
Title: 難燃生成物
IPC: C08L101/00
Filed: 1996-06-20
Abstract: (57)【要約】
酸化スズまたはヒドロキシスズ酸二価金属塩またはスズ酸二価金属塩の層を被覆した粒子状無機充填剤(スズ化合物以外)からなる難燃物質の製造方法であって、以下の工程：(i)ヒドロキシスズ酸アルカリの水溶液(所望により、二価金属酸化物をも溶解して含有する)中で粒子状無機充填剤のスラリーを形成させ；(ii)工程(i)のスラリーを加水分解剤または水溶性の二価金属供給源と反応させて、充填剤の表面に酸化スズまたはヒドロキシスズ酸二価金属塩の層を形成させ；(iii)所望により、工程(ii)のヒドロキシスズ酸塩を被覆した充填剤を加熱して、対応するスズ酸二価金属塩に変換する；からなる方法が開示されている。