中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

44 records (took 0.021 seconds)

    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 HYDROPHILIC SILICA GEL HAVING HIGH PORE VOLUME
    3.
    发明专利
    PRODUCTION OF HYDROPHILIC SILICA GEL HAVING HIGH PORE VOLUME 失效

    公开(公告)号：JP2001019422A

    公开(公告)日：2001-01-23

    申请号：JP2000172851

    申请日：2000-06-09

    Applicant: DOW CORNING

    Inventor： DENG QIN ,  HAHN JAMES RICHARD ,  SHEPHARD KIERSTEN LYNN

    IPC: C01B33/152 ,  C01B33/16

    Abstract: PROBLEM TO BE SOLVED: To obtain a hydrophilic silica gel having high porosity without relying on a conventional method for producing an aerogel by heating a hydrophobic silica hydrogel having bonded organic substituents in an oxidizing atmosphere at a sufficiently high temperature to lower the hydrophobicity of the hydrophobic silica hydrogel by the oxidation of the organic substituents. SOLUTION: A silica hydrogel is brought into contact with a catalytic amount of a strong acid and a organosilicon compound selected from an organosilane of formula I, an oganosiloxane of formula II and an organodisilazane of formula III, preferably hexamethylsiloxane or dimethyldichlorosilane to form a hydrophobic silica hydrogel. This hydrophobic silica hydrogel is heated in an oxidizing atmosphere at a sufficiently high temperature (300-1,000 deg.C) to lower the hydrophobicity of the hydrophobic silica hydrogel to obtain the objective hydrophilic silica gel. In the formulae, R1 is a 1-12C (organofunctional) hydrocarbon, X is a halogen or a 1-12C alkoxy, (a) is 0, 1 or 2 and (b) is 0 or 1.

    NEUTRAL-AGED HYDROPHOBIC SILICA GELS WITH REDUCED SURFACE AREA
    5.
    发明专利
    NEUTRAL-AGED HYDROPHOBIC SILICA GELS WITH REDUCED SURFACE AREA 未知

    公开(公告)号：CA2280909C

    公开(公告)日：2007-11-13

    申请号：CA2280909

    申请日：1998-02-18

    Applicant: DOW CORNING

    Inventor： BURNS GARY T ,  REESE CLIFFORD C ,  HAHN JAMES R ,  DENG QIN

    IPC: C01B33/159 ,  C01B33/154 ,  C01B33/16 ,  C09C1/30

    Abstract: The present invention is neutral-aged hydrophobic silica gels having a reduc ed surface area and a method for their preparation. The method comprises three steps, where in the first step a mixture comprising a silica hydrosol and colloidal silica is contacted with a strong mineral acid at a pH less than about 1 to form a silica hydrogel having incorporated therein colloidal silica. In the second step the silica hydrogel is aged at a pH within a range of about pH 3.5 to pH 8. In the thir d step the silica hydrogel is contacted with an organosilicon compound in the presence of a catalytic amount of a strong acid to effect hydrophobing of the silica hydrogel to form a hydrophobic silica hydrogel having a surface area within a range of about 100 m2/g to 450 m2/g in the dry state. In a preferred method the hydrophobic silica hydrogel is further contacted with a sufficient quantity of a water-immiscib le organic solvent to convert the hydrophobic silica hydrogel into a hydrophobic silica organogel.

    6.
    发明专利
    未知

    公开(公告)号：DE69827400D1

    公开(公告)日：2004-12-09

    申请号：DE69827400

    申请日：1998-02-18

    Applicant: DOW CORNING

    Inventor： BURNS T ,  DENG QIN ,  HAHN R ,  REESE C

    IPC: C01B33/159 ,  C01B33/16 ,  C09C1/30 ,  C09C3/12

    Abstract: The present invention is hydrophobic organosilicate-modified silica gels and a method for their preparation under neutral conditions. The method comprises two steps, where in the first step the pH of an organosilicate-modified silica hydrosol is adjusted with a base to within a range of about pH 3 to pH 7 to facilitate formation of an organosilicate-modified silica hydrogel. In the second step the organosilicate-modified silica hydrogel is contacted with an organosilicon compound in the presence of a catalytic amount of a strong acid to effect hydrophobing of the organosilicate-modified silica hydrogel to form a hydrophobic organosilicate-modified silica gel having a surface area within a range of about 100 m2/g to 850 m2/g in the dry state. In a preferred process the hydrophobic organosilicate-modified silica hydrogel is contacted with a sufficient quantity of a water-immiscible organic solvent to convert the hydrophobic organosilicate-modified silica hydrogel into a hydrophobic organosilicate-modified silica organogel. A water soluble compound of cerium or iron may be added in the second step to improve the heat stability of the hydrophobic organosilicate-modified silica gel.

    7.
    发明专利
    未知

    公开(公告)号：DE69804774T2

    公开(公告)日：2002-11-14

    申请号：DE69804774

    申请日：1998-02-18

    Applicant: DOW CORNING

    Inventor： BURNS T ,  DENG QIN ,  HAHN R ,  REESE C

    IPC: C01B33/159 ,  C01B33/16 ,  C09C1/30

    Abstract: The present invention is neutral-aged hydrophobic organosilicate-modified silica gels and a method for their preparation. The method comprises three steps, where in the first step an organosilicate-modified silica hydrosol is contacted with a strong mineral acid at a pH less than about 1 to form an organosilicate-modified silica hydrogel. In the second step the organosilicate-modified silica hydrogel is aged at a pH within a range of about pH 3.5 to pH 8. In the third step the neutral-aged organosilicate-modified silica hydrogel is contacted with an organosilicon compound in the presence of a catalytic amount of a strong acid to effect hydrophobing of the organosilicate-modified silica hydrogel to form a hydrophobic organosilicate-modified silica hydrogel having a surface area within a range of about 100 m2/g to 750 m2/g in the dry state. In a preferred process the hydrophobic organosilicate-modified silica hydrogel is contacted with a sufficient quantity of a water-immiscible organic solvent to convert the hydrophobic organosilicate-modified silica hydrogel into a hydrophobic organosilicate-modified silica organogel.

    8.
    发明专利
    未知

    公开(公告)号：ES2165147T3

    公开(公告)日：2002-03-01

    申请号：ES98907514

    申请日：1998-02-18

    Applicant: DOW CORNING

    Inventor： BURNS GARY T ,  DENG QIN ,  HAHN JAMES R ,  REESE CLIFFORD C

    IPC: C01B33/159 ,  C01B33/16 ,  C09C1/30

    Abstract: The present invention is hydrophobic silica gels having a reduced surface area and a method for their preparation under neutral conditions. The method comprises two steps, where in the first step the pH of a mixture comprising a silica hydrosol and colloidal silica is adjusted with a base to within a range of pH 3 to pH 6 to facilitate formation of a silica hydrogel having incorporated therein colloidal silica. In the second step the silica hydrogel is contacted with an organosilicon compound in the presence of a catalytic amount of a strong acid to effect hydrophobing of the silica hydrogel to form a hydrophobic silica gel having a surface area within a range of about 100 m2/g to 450 m2/g in the dry state. In a preferred process the hydrophobic silica gel is contacted with a sufficient quantity of a water-immiscible organic solvent to convert the hydrophobic silica hydrogel into a hydrophobic silica organogel. A water soluble compound of cerium or iron may be added during conduct of the second step to improve heat stability of the hydrophobic silica gel.

    METHOD FOR MAKING HYDROPHOBIC SILICA GELS UNDER NEUTRAL CONDITIONS
    9.
    发明专利
    METHOD FOR MAKING HYDROPHOBIC SILICA GELS UNDER NEUTRAL CONDITIONS 未知

    公开(公告)号：MY133859A

    公开(公告)日：2007-11-30

    申请号：MYPI9800710

    申请日：1998-02-19

    Applicant: DOW CORNING

    Inventor： BURNS GARY THOMAS ,  HAHN JAMES RICHARD ,  REESE CLIFFORD CARLTON ,  DENG QIN

    IPC: C01B33/159 ,  C08K3/10 ,  C08K9/06 ,  C09C1/28 ,  C09C3/12

    Abstract: THE PRESENT INVENTION IS HYDROPHOBIC SILICA GELS AND A METHOD FOR THEIR PREPARATION UNDER NEUTRAL CONDITIONS. THE METHOD COMPRISES TWO STEPS, WHERE IN THE FIRST STEP THE PH OF A SILICA HYDROSOL IS ADJUSTED WITH A BASE TO WITHIN A RANGE OF PH 3 TO PH 7 TO FACILITATE FORMATION OF A SILICA HYDROGEL. IN THE SECOND STEP, THE SILICA HYDROGEL IS CONTACTED WITH AN ORGANOSILICON COMPOUND IN THE PRESENCE OF A CATALYTIC AMOUNT OF A STRONG ACID TO EFFECT HYDROPHOBING OF THE SILICA HYDROGEL. IN A PREFERRED METHOD, IN A THIRD STEP THE HYDROPHOBIC SILICA GEL IS CONTACTED WITH A SUFFICIENT QUANTITY OF A WATER-IMMISCIBLE ORGANIC SOLVENT TO CONVERT THE HYDROPHOBIC SILICA HYDROGEL INTO A HYDROPHOBIC SILICA ORGANOGEL.

Patent Agency Ranking