PRODUCTION OF SODIUM SULFIDE ANHYDRIDE

    公开(公告)号:JPH11236204A

    公开(公告)日:1999-08-31

    申请号:JP35468098

    申请日:1998-12-14

    Applicant: DEGUSSA

    Abstract: PROBLEM TO BE SOLVED: To prevent undesirable fusing of a dehydrated substance and to obtain an anhydride product by passing sodium sulfate having a specified water content through a device, continuously raising the temp. of the device from the entrance to the exit, and maintaining low pressure. SOLUTION: Sodium sulfide having 35 to 45% water content, especially 38 to 40% is carried by mixing and passing through a device. The temp. of the Na2 S hydrate supplied to the device (product temp.) is continuously increased in such a manner that the temp. is about 20 deg.C at the supply position of the solid and >180 deg.C at the exit of the solid. At the same time, low pressure as =90 min residential time in the drying device.

    METHOD OF PRODUCING ORGANOSILANE FUNCTIONALIZED AT 3- POSITION

    公开(公告)号:JP2003137892A

    公开(公告)日:2003-05-14

    申请号:JP2002314495

    申请日:2002-10-29

    Applicant: DEGUSSA

    Abstract: PROBLEM TO BE SOLVED: To provide a method of producing an organosilane functionalized at 3-position in which an allyl compound (H2 C=CH-CH2 X) is allowed to react with a silane (R2 R3 R4 SiH) in the presence of a heterogeneous platinum catalyst under a pressure of 1-25 bars in the reaction column. SOLUTION: A stoichiometrically excessive amount of the silane reactant is fed into the reaction column filled with an allyl compound. The reaction column preferably comprises the reaction zone, the first separation zone above the reaction zone and the second separation zone below the reaction zone. The first reaction product goes out of the reaction zone and comes into the first separation zone and the second reaction product goes out of the reaction zone and comes into the second separation zone whereby the distillation occurs simultaneously together with the reaction in the reaction chamber.

    METHOD FOR BONDING TWO SOLIDS TO EACH OTHER AND STRUCTURAL MATERIAL

    公开(公告)号:JPH11335631A

    公开(公告)日:1999-12-07

    申请号:JP12276899

    申请日:1999-04-28

    Applicant: DEGUSSA

    Abstract: PROBLEM TO BE SOLVED: To provide a method for bonding solids using covalent bond in relatively low temperature by bringing organosilicon compound unimolecular layers applied on the surface of two solids into contact with each other. SOLUTION: This method comprises applying unimolecular layers of an organosilicon compound of the formula (R is methyl, ethyl or propyl; X is 1, 2, 3 or 4; Y is 2-6) [preferably bis(alkoxysilylpropyl)disulfane] on the respective surfaces of two solids and, thereafter, bringing the solids into contact with each other so as to bond their almost smooth surface of the solids. The solids to be bonded preferably have hydrophilic surfaces. The compound of the formula is preferably used in gas phase and deposited on the surfaces so as to form the unimolecular layers. The compound of the formula is preferably used as a solution having >0-10 mol/L concentration. This method can be used for a composite structural material for microelectronics and micromechanics.

    Verfahren zur Herstellung einer Siliciumdioxidpartikel und Kationisierungsmittel aufweisenden Dispersion

    公开(公告)号:DE102010031184A1

    公开(公告)日:2012-01-12

    申请号:DE102010031184

    申请日:2010-07-09

    Abstract: Verfahren zur Herstellung einer Siliciumdioxidpartikel und Kationisierungsmittel aufweisenden Dispersion, indem man 50 bis 75 Gewichtsteile Wasser, 25 bis 50 Gewichtsteile Siliciumdioxidpartikel mit einer BET-Oberfläche von 30 bis 500 m2/g und 100 bis 300 μg Kationisierungsmittel pro Quadratmeter BET-Oberfläche der Siliciumdioxidpartikel dispergiert, wobei das Kationisierungsmittel erhältlich ist, indem man mindestens ein halogenalkylfunktionelles Alkoxysilan, dessen Hydrolyseprodukte oder Kondensationsprodukte und/oder ein Gemisch der vorgenannten Stoffe mit mindestens einem Aminoalkohol und einer definierten Menge Wasser umsetzt und den gebildeten Hydrolysealkohol optional zumindest teilweise aus dem Reaktionsgemisch entfernt. Verfahren zur Herstellung einer Siliciumdioxidpartikel und Kationisierungsmittel aufweisenden Dispersion, indem man 50 bis 75 Gewichtsteile Wasser, 25 bis 50 Gewichtsteile Siliciumdioxidpartikel mit einer BET-Oberfläche von 30 bis 500 m2/g und 100 bis 300 μg eines Kationisierungsmittels pro Quadratmeter BET-Oberfläche der Siliciumdioxidpartikel dispergiert, wobei das Kationisierungsmittel eine oder mehrere quartäre, aminoalkoholfunktionelle, siliciumorganische Verbindungen der allgemeinen Formel III und/oder deren Kondensationsprodukte umfasst, wobei Ru und Rv, jeweils unabhängig voneinander, eine Alkylgruppe mit 2 bis 4 Kohlenstoffatomen ist, m = 2 bis 5 und n = 2 bis 5 ist.

    19.
    发明专利
    未知

    公开(公告)号:DK1331254T3

    公开(公告)日:2007-01-02

    申请号:DK02026283

    申请日:2002-11-27

    Applicant: DEGUSSA

    Abstract: In dispersions of mixed oxide particles containing silicon dioxide and cationic polymer, the amount of cationic polymer can be 25% decreased by doping the silicon dioxide with 0.25 wt.% aluminum oxide without affecting the positive surface charge on the particles. A stable aqueous dispersion contains flame-hydrolytically prepared mixed oxide particles containing silicon dioxide and aluminum oxide or titanium dioxide, with a BET (Brunauer Emmett Teller) surface area between 5 and 600 m2/g, which shows a negative zeta potential, and a dissolved cationic polymer of weight average mol. wt. less than 100,000 g/mole, the dispersion having a positive zeta potential. Independent claims are also included for the following: (1) a process for preparation of the dispersion involving predispersion and final dispersion, where before predispersion the cationic polymer is included in an aqueous medium or is added during dispersion, or the mixed oxide particles and cationic polymer are added alternately; (2) a brushing on paint for formation of an ink acceptance layer using the dispersion and at least one hydrophilic binder; (3) a process for preparation of the brushing on paint by addition of the dispersion to a solution of hydrophilic binder, optionally with addition of other additives, followed by dilution to the required ratio of mixed oxide and binder and the desired total solids content; (4) an ink take up medium using a brushing on paint; and (5) a method for preparation of the ink take up medium involving application of the brushing on paint to a carrier and drying.

    20.
    发明专利
    未知

    公开(公告)号:ES2216376T3

    公开(公告)日:2004-10-16

    申请号:ES99110615

    申请日:1999-06-02

    Applicant: DEGUSSA

    Abstract: Oligomeric organosilane polysulfanes are novel. An oligomeric organosilane polysulfane (I) contains structural units (A), (B) and/or (C) in any linear, branched or cyclic arrangement whereby at least (A) or (B) is present. Independent claims are included for: (i) a process for the production of (I) by reaction of a compound of formula (1), optionally in a solvent and/or in the presence of a catalyst at 0-150 degrees C with addition of water to cause self polymerization or under analogous reaction conditions by copolymerization with a compound of formula (2); (ii) a rubber mixture (II) containing organosilane polysulfane (I); (iii) a process for the production of the rubber mixture (II) by addition of (I) and a filler to rubber; and (iv) molded articles prepared from (II). Y-Sx-(CH2)nSiR R R (1) RR R R Si (2) Y = H, CN, -(CH2)nSiRR R ; n = 1-8; R-R = H, 1-4C alkyl, 1-4C alkoxy, halogen or OSiR R R ; x = 1-8; z = 2-6; o, p, qq = 1-40; o+p+q = 2-40.

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