A Process for the Production of Finely Divided Organically Modified Silicas

    公开(公告)号:GB1155523A

    公开(公告)日:1969-06-18

    申请号:GB2796267

    申请日:1967-06-16

    Applicant: DEGUSSA

    Abstract: 1,155,523. Organically - modified silica. DEUTSCHE GOLD-UND SILBER-SCHEIDEANSTALT. 16 June, 1967 [18 June, 1966], No. 27962/67. Heading C1A. Finely-divided organically modified silica is precipitated, preferably at 50-90‹ C., from a silicate solution, e.g. water glass, by an inorganic or organic acid in the presence of one or more water-soluble organic polymers capable of undergoing modification of their properties by chemical reactions and of combination with silica, e.g. polyvinyl alcohol, polyethylene imine, polyacrolein, polymethacrylic acid, polyethylene oxide, polyvinyl pyrrolidone, polyvinyl-3- methyl pyrrolidone, vinyl pyrrolidone/vinyl acetate copolymers, polyacrylamide. The polymer(s) may be dissolved in the reaction mixture before precipitation or gradually added thereto during precipitation; in some cases a pure silica core may be formed around an organicallymodified shell. The polymers may be caused to undergo organic reactions, e.g. substitution, addition, salt or complex formation, or may be refined by substantive, reactive or leuco dyes at any time after silica is first formed (although not necessarily precipitated): examples of such reactions are given.

    Grey pigment with good technological properties

    公开(公告)号:GB1139620A

    公开(公告)日:1969-01-08

    申请号:GB2932367

    申请日:1967-06-26

    Applicant: DEGUSSA

    Abstract: 1,139,620. Modified carbon black. DEUTSCHE GOLDUND SILBER-SCHEIDEANSTALT. 26 June, 1967 [24 June, 1966], No. 29323/67. Heading C1A. [Also in Division C4] A grey pigment comprising carbon black and a finely divided metal and/or metalloid oxide is obtained by activating the surface of the carbon black by reaction with a silicon or titanium halide, particularly the tetrachloride, and subsequently hydrolysing the activated carbon by introducing it either into water, or into a suspension of a finely divided precipitated or pyrogenic oxide of silicon and/or titanium and/or aluminium, or into a precipitation solution of a salt of one of these elements. The process is applicable to lamp black, of average particle size 100-200 mÁ, or to furnace black of 20-100 mÁ.

Patent Agency Ranking