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公开(公告)号：ES2094580T3
公开(公告)日：1997-01-16
申请号：ES94104663
申请日：1994-03-24
Applicant: BASF AG
Inventor： KLINGELHOEFER PAUL DR , SCHWIDETZKY CHRISTOPH DR , WIENAND HENNING DR , MRONGA NORBERT DR , SCHWAB EKKEHARD DR , NEBEL MICHAEL
Abstract: Preparation of transparent yellow iron oxide pigments by precipitation of iron(II) hydroxide by addition of an inorganic base to an iron(II) salt solution and subsequent oxidation to FeOOH, in which a) an aqueous iron(II) salt solution having a molarity of at least 0.5 is first admixed at from 25 to 45@C in the presence of dissolved phosphates and, if desired, zinc salts with sufficient base for from 50 to 70% of the iron(II) ions used to be precipitated as hydroxide, then oxidising gas is passed through the mixture obtained until the pH has dropped to a value
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公开(公告)号：DE4310864A1
公开(公告)日：1994-10-06
申请号：DE4310864
申请日：1993-04-02
Applicant: BASF AG
Inventor： KLINGELHOEFER PAUL DR , SCHWIDETZKY CHRISTOPH DR , WIENAND HENNING DR , MRONGA NORBERT DR , SCHWAB EKKEHARD DR , NEBEL MICHAEL
Abstract: Preparation of transparent yellow iron oxide pigments by precipitation of iron(II) hydroxide by addition of an inorganic base to an iron(II) salt solution and subsequent oxidation to FeOOH, in which a) an aqueous iron(II) salt solution having a molarity of at least 0.5 is first admixed at from 25 to 45@C in the presence of dissolved phosphates and, if desired, zinc salts with sufficient base for from 50 to 70% of the iron(II) ions used to be precipitated as hydroxide, then oxidising gas is passed through the mixture obtained until the pH has dropped to a value
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公开(公告)号：DE3926870A1
公开(公告)日：1991-02-21
申请号：DE3926870
申请日：1989-08-16
Applicant: BASF AG
Inventor： SCHWIDETZKY CHRISTOPH DR , OSTERTAG WERNER DR , WIENAND HENNING DR
IPC: C09C1/00
Abstract: Bi vanadate pigments or pigments contg. Bi vanadate are coated with hardly soluble inorganic Fe cpds. (I). Pref. (I) are used in amts. of 0.001-2.0, pref. 0.05-0.5 wt.% w.r.t. the pigment. The pigments are produced by sepg. them from a suspension in an aq. Fe salt soln. and drying. The Fe salt is Fe2(SO4)3, Fe(NO3)3 or FeCl3. USE/ADVANTAGE - For pigmenting paints, printing inks and plastics. The (I) coating greatly reduced the photochromic effect. In an example, a suspension of 80 g pigment with the compsn. BiVO4.0.75 Bi2MoO6 and 120 g water was ball milled for 60 min. at 1200 rpm (A) without additive or with addn. of (B) 11.4 g Fe(NO3)3.9H2O or 6.8 g Fe2(SO4)3 in dissolved form. The suspension was filtered, washed and dried, giving a pigment contg. (A) 0.003, (B) 0.05, (C) 0.02 wt.% Fe. Paint contg. 20 g pigment in 80 g alkyl-melamine resin was sprayed onto sheet metal and half the sheet was exposed to a 1000 W lamp, 50 cm away, for 1 h. The difference in colour between the exposed and unexposed areas was (A) 2.2, (B) 1.1, (C) 0.7 immediately after exposure and (A) 1.0, (B) 0.2, (C) 0.1, 24 h after exposure.
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公开(公告)号：DE59400978D1
公开(公告)日：1996-12-12
申请号：DE59400978
申请日：1994-03-24
Applicant: BASF AG
Inventor： KLINGELHOEFER PAUL DR , SCHWIDETZKY CHRISTOPH DR , WIENAND HENNING DR , MRONGA NORBERT DR , SCHWAB EKKEHARD DR , NEBEL MICHAEL
Abstract: Preparation of transparent yellow iron oxide pigments by precipitation of iron(II) hydroxide by addition of an inorganic base to an iron(II) salt solution and subsequent oxidation to FeOOH, in which a) an aqueous iron(II) salt solution having a molarity of at least 0.5 is first admixed at from 25 to 45@C in the presence of dissolved phosphates and, if desired, zinc salts with sufficient base for from 50 to 70% of the iron(II) ions used to be precipitated as hydroxide, then oxidising gas is passed through the mixture obtained until the pH has dropped to a value
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公开(公告)号：DE3643247A1
公开(公告)日：1988-06-30
申请号：DE3643247
申请日：1986-12-18
Applicant: BASF AG
Abstract: Thermostable bismuth vanadate/molybdate pigments are prepared by precipitating onto a pigment, obtained by calcination, of the formula Bi VO4.Bi2Mo O6 where n is 0.2-2.5, in aqueous suspension at 70 DEG -100 DEG C. within the pH range from 4 to 9.5 a first SiO2-containing layer using an alkali metal silicate solution of a magnesium hexafluorosilicate solution, maintaining the suspension at 70 DEG -100 DEG C. for not less than 1 hour, producing a thick coating on the precoated pigment by adding further alkali metal silicate solution, magnesium hexafluorosilicate solution or a mixture of the two within the pH range from 4 to 9.5, and finally depositing wax on the SiO2-containing layer by means of a waxing emulsion/dispersion, the products showing, compared with the starting pigment, an appreciably improved thermal stability in plastics.
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Patent Agency Ranking
公开(公告)号：DE59400627D1
公开(公告)日：1996-10-17
申请号：DE59400627
申请日：1994-06-23
Applicant: BASF AG
Inventor： SCHMIDT RAIMUND DR , MRONGA NORBERT DR , OCHMANN HARALD DR , SCHWIDETZKY CHRISTOPH DR
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公开(公告)号：DE59001357D1
公开(公告)日：1993-06-09
申请号：DE59001357
申请日：1990-08-31
Applicant: BASF AG
Inventor： OSTERTAG WERNER DR , SCHWIDETZKY CHRISTOPH DR , MRONGA NORBERT DR
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公开(公告)号：DE3863901D1
公开(公告)日：1991-08-29
申请号：DE3863901
申请日：1988-10-31
Applicant: BASF AG
Inventor： OSTERTAG WERNER DR , SCHWIDETZKY CHRISTOPH DR , MRONGA NORBERT DR
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公开(公告)号：DE3770430D1
公开(公告)日：1991-07-04
申请号：DE3770430
申请日：1987-12-09
Applicant: BASF AG
Abstract: Thermostable bismuth vanadate/molybdate pigments are prepared by precipitating onto a pigment, obtained by calcination, of the formula Bi VO4.Bi2Mo O6 where n is 0.2-2.5, in aqueous suspension at 70 DEG -100 DEG C. within the pH range from 4 to 9.5 a first SiO2-containing layer using an alkali metal silicate solution of a magnesium hexafluorosilicate solution, maintaining the suspension at 70 DEG -100 DEG C. for not less than 1 hour, producing a thick coating on the precoated pigment by adding further alkali metal silicate solution, magnesium hexafluorosilicate solution or a mixture of the two within the pH range from 4 to 9.5, and finally depositing wax on the SiO2-containing layer by means of a waxing emulsion/dispersion, the products showing, compared with the starting pigment, an appreciably improved thermal stability in plastics.
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公开(公告)号：DE3930601A1
公开(公告)日：1991-03-14
申请号：DE3930601
申请日：1989-09-13
Applicant: BASF AG
Inventor： OSTERTAG WERNER DR , SCHWIDETZKY CHRISTOPH DR , MRONGA NORBERT DR
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