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    PRODUCTION OF HYDROPHOBIC PRECIPITATED SILICA
    1.
    发明专利
    PRODUCTION OF HYDROPHOBIC PRECIPITATED SILICA 失效

    公开(公告)号：JP2000327321A

    公开(公告)日：2000-11-28

    申请号：JP2000123383

    申请日：2000-04-25

    Applicant: DOW CORNING

    Inventor： BURNS GARY THOMAS ,  DENG QIN ,  HAHN JAMES RICHARD ,  KRIVAK THOMAS G ,  OKEL TIMOTHY A ,  REESE CLIFFORD CARLTON

    IPC: C01B33/18 ,  C01B33/193 ,  C09C1/30

    Abstract: PROBLEM TO BE SOLVED: To obtain a silica useful as a reinforcing filler for a silicone rubber composition by bringing an organic silicon compound selected from organosilane, organosiloxane and organodisilazane into contact with a hydrophilic precipitated silica in the presence of a mixture of water and a miscible organic solvent of an amount sufficient for promoting the reaction of the organic silicon compound with the hydrophilic precipitated silica. SOLUTION: An aqueous suspension of a hydrophilic precipitated silica is brought into contact with one or more kinds of organic silicon compound selected from an organosilane of formula I: R1aHbSiX4-a-b, an organosiloxane expressed by the average unit formula II: R2nSiO(4-n)/2 and an organodisilazane expressed by formula III: (R33Si)2NH in the presence of a catalytic amount of an acid. A mineral acid such as hydrochloric acid, hydroiodic acid and sulfuric acid can be used as the acid catalyst. In the above formulas, R1 groups are each a 1-12C hydrocarbon group; R2 groups are each H, Cl or the like; R3 is a 1-12C hydrocarbon group; X groups are each a hydrolyzable group bonded to Si; (a) is 2 or 3; (b) is 0 or 1; a+b is 1-3; (n) is an integer of 2-3.

    PRODUCTION OF HYDROPHOBIC PRECIPITATED SILICA
    2.
    发明专利
    PRODUCTION OF HYDROPHOBIC PRECIPITATED SILICA 失效

    公开(公告)号：JP2000327322A

    公开(公告)日：2000-11-28

    申请号：JP2000123384

    申请日：2000-04-25

    Applicant: DOW CORNING

    Inventor： BURNS GARY THOMAS ,  DENG QIN ,  HAHN JAMES RICHARD ,  KRIVAK THOMAS G ,  OKEL TIMOTHY A ,  REESE CLIFFORD CARLTON

    IPC: C01B33/18 ,  C01B33/193 ,  C09C1/30

    Abstract: PROBLEM TO BE SOLVED: To obtain a silica useful as a reinforcing filler for a silicone rubber composition by bringing an organic silicon compound selected from organosilane, organosiloxane and organodisilazane into contact with a hydrophilic precipitated silica in the presence of a surfactant of an amount sufficient for promoting the reaction of the organic silicon compound with the hydrophilic precipitated silica. SOLUTION: An aqueous suspension of a hydrophilic precipitated silica is brought into contact with one or more kinds of organic silicon compound selected from an organosilane of formula I: R1aHbSiX4-a-b, an organosiloxane expressed by the average unit formula II: R2nSiO(4-n)/2 and an organodisilazane expressed by formula III: (R33Si)2NH in the presence of a catalytic amount of an acid. Useful examples of the silicon compound are diethyldichlorosilane and allylmethyldichlorosilane. In the above formulas, R1 groups are each a 1-12C hydrocarbon group; R2 groups are each H, Cl or the like; R3 is a 1-12C hydrocarbon group; X groups are each a hydrolyzable group bonded to Si; (a) is 2 or 3; (b) is 0 or 1; a+b is 1-3; (n) is an integer of 2-3.

    PRODUCTION OF POLYSILOXANE SHEETLIKE OR TUBULAR POLYMER
    3.
    发明专利
    PRODUCTION OF POLYSILOXANE SHEETLIKE OR TUBULAR POLYMER 失效

    公开(公告)号：JP2000072877A

    公开(公告)日：2000-03-07

    申请号：JP24138899

    申请日：1999-08-27

    Applicant: DOW CORNING

    Inventor： BURNS GARY THOMAS ,  CHAO TIMOTHY CHI-SHAN ,  JALLOULI AREF BEN AHMED ,  KATSOULIS DIMITRIS ELIAS

    IPC: C08G77/06 ,  C08G77/04 ,  C08G77/24

    Abstract: PROBLEM TO BE SOLVED: To obtain a polysiloxane sheetlike or tubular polymer. SOLUTION: This method for producing a polysiloxane sheetlike or tubular polymer comprises bringing a sheetlike or tubular silicate into contact with a halogen end blocked halosiloxane of the formula (X is chlorine, fluorine, bromine or iodine; R1-R7 are each a 1-6C-containing alkyl group, aryl group, alkaryl group or aralkyl group; (n) is an integer of 2-20; one of R1, R4 and R5 is X) in the presence of a polar solvent or a combination of the polar solvent and a nonpolar solvent and heating the obtained mixture until a polysiloxane sheetlike or tubular polymer containing a siloxane side group is formed.

    OPTICALLY CLEAR SILICONE RUBBER
    7.
    发明专利
    OPTICALLY CLEAR SILICONE RUBBER 失效

    公开(公告)号：JPH10120906A

    公开(公告)日：1998-05-12

    申请号：JP25965397

    申请日：1997-09-25

    Applicant: DOW CORNING

    Inventor： BURNS GARY THOMAS ,  REITER MICHAEL ROBERT

    IPC: C08K3/36 ,  C08K9/06 ,  C08L83/04 ,  C08L83/05 ,  C08L83/07

    Abstract: PROBLEM TO BE SOLVED: To obtain a rubber composition which comprises a base polymer mixture containing two kinds of copolymers, a reinforcing silica filler, a crosslinking agent and a metallic catalyst in the platinum group and can manifest optical transparency and good physical properties. SOLUTION: This rubber composition comprises (A) 100 pts.wt. of a mixture containing (i) 60-90wt.% of a polydimethyl(diphenyl)siloxane copolymer bearing a vinyldimethylsiloxy group as a chain terminal, which contains 1-20mol% of diphenylsiloxane units and has a viscosity of 20,000-100,000mPa.S at 25 deg.C and (ii) 10-40wt.% of polydimethyl(diphenyl)siloxane copolymer bearing a vinyldimethylsiloxy group as a chain terminal, which contains 1-20mol% of dimethylsiloxy units, has a viscosity of 50-10,000mPa.S at 25 deg.C and arbitrarily contains at most 3mol% of vinyldimethylsiloxy units, (B) 20-60 pts.wt. of a treated reinforcing silica filler, (C) a sufficient amount of a methyhydrogensiloxane crosslinking agent and (D) a sufficient amount of a metallic catalyst in the platinum group.

    Treatment of fillers with oxa-silacycloalkanes
    9.
    发明公开
    Treatment of fillers with oxa-silacycloalkanes 失效
    与Oxasilacycloalkanen填料的治疗

    公开(公告)号：EP0768347A3

    公开(公告)日：1998-06-17

    申请号：EP96306897

    申请日：1996-09-23

    Applicant: DOW CORNING

    Inventor： BURNS GARY THOMAS ,  KENNAN LINDA DENISE ,  ROY AROOP KUMAR ,  TSELEPIS ARTHUR JAMES

    IPC: C09C3/08 ,  C08K9/06 ,  C09C3/12

    CPC classification number: C08K9/06

    Abstract: A method of hydrophobicising a filler comprises: (i) contacting a filler of inorganic pigments, metal oxides, metal hydroxides or silicate minerals, with an oxa-sila-cycloalkane in an amt. sufficient for at least a portion of the hydroxyl functionality on the filler to be replaced with carbinol functionality. Also claimed are: (1) a filler prepd. by the above method; and (2) a filler having a surface contg. carbinol functionality of formula (I): R' = 1-6C alkyl, aryl, aralkyl, alkaryl or halohydrocarbon; and R" = -CH2CH(CH3)CH2-, -CH2CH2CH2-, -CH(C6H5)CH2CH2- or -CH2CH2CH2CH2-.

    10.
    发明专利
    未知

    公开(公告)号：DE69906895D1

    公开(公告)日：2003-05-22

    申请号：DE69906895

    申请日：1999-07-20

    Applicant: DOW CORNING

    Inventor： BURNS GARY THOMAS ,  HAHN JAMES RICHARD ,  DEGROOT JON VIERLING JR ,  HARRINGTON DANIEL ANTON ,  MOORE PATRICIA ANN

    IPC: C08K3/34 ,  C01B33/149 ,  C08L83/04 ,  C09C1/28 ,  C09C1/30

    Abstract: A method is disclosed and claimed herein for making a hydrophobic non-aggregated colloidal silica comprising reacting an aqueous suspension of a hydrophilic non-aggregated colloidal silica having an average particle diameter greater than 4 nm with a silicon compound at a pH less than pH 4 in the presence of a sufficient quantity of a water-miscible organic solvent to facilitate contact of the hydrophilic non-aggregated colloidal silica with the silicon compound. This method is conducted at a temperature within a range of 20 to 250 DEG C. for a period of time sufficient to form a hydrophobic non-aggregated colloidal silica. The resulting hydrophobic non-aggregated colloidal silicas prepared herein are particularly useful as reinforcing and extending fillers in silicone or organic compositions including adhesives, rubbers and sealants.

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