公开(公告)号：DE2938510A1

公开(公告)日：1981-04-23

申请号：DE2938510

申请日：1979-09-24

Applicant: BASF AG

Inventor： HORN DIETER DIPL CHEM DR ,  DITTER WALTER ,  AUHORN WERNER ING GRAD

IPC: C02F1/52 ,  C02F1/54 ,  B01D43/00 ,  D21C9/18 ,  D21D3/00

Abstract: Flocculation of negatively charged solid particles in aq. systems is affected by adding a cationic polyelectrolyte (I). The process is carried out by (a) adding 40-100% of the amt. of (I) required for optimum flocculation to 25-75% of the total amt. of the aq. system, (b) homogeneously dispersing the added (I) in the aq. system, (c) combining the mixt. with the remaining 25-75% of the aq. system, and (d) adding the remaining 0-60% of (I). The process is esp. applicable to fibre and filler slurries in papermaking machines, but can also be applied to sewage, waste waters, etc. Compared with adding the whole amt. of (I) to the whole aq. system, the process increases the flocculation rate and/or the degree of flocculation.

公开(公告)号：DE2458605A1

公开(公告)日：1976-06-16

申请号：DE2458605

申请日：1974-12-11

Applicant: BASF AG

Inventor： DITTER WALTER ,  HORN DIETER DIPL CHEM DR

IPC: G01N27/447 ,  G01N13/00 ,  G01N15/04 ,  G01N33/32 ,  G01P5/00

Abstract: The electrophoretic displacement, or diffusion, speed measurement is of dispersed particles in moist or dry media taking place in a cell with condenser electrodes (1, 2) separated by pillars (3) and in which cell the dispersion is formed with a front (6). One of the condenser plates (2) is permeable to measuring light used and is of silicon, germanium, glass or quartz, depending on the wavelength of traversing light. A monochromatic incident beam (5) meets the dispersed front (6) to form the resultant re-emergent beam (7). The intensity of the latter depends on the displacement, or diffusion, speed of the dispersed particles and can be used for its determination.

公开(公告)号：DE3235369A1

公开(公告)日：1984-03-29

申请号：DE3235369

申请日：1982-09-24

Applicant: BASF AG

Inventor： AUWETER HELMUT DIPL PHYS DR ,  HORN DIETER DIPL CHEM DR ,  LUEDDECKE ERIK DIPL CHEM DR

IPC: G01N15/02 ,  G01P5/00 ,  G01P5/26 ,  G01N21/00 ,  G01N21/53 ,  G01N15/04 ,  G01W1/00

Abstract: In a fiber-optical Doppler anemometer for measurement of fluctuating light or the Doppler broadening of laser light scattered by a scattering medium, for example by particles in motion, coherent laser light is passed via a fiber-optical coupler (1) and a submerged fiber-optical probe (2) into the scattering medium, and the light scattered back by the scattering medium is picked up by the submerged fiber-optical probe (2), branched by the fiber-optical coupler (1) and passed to a photodetector (3).

公开(公告)号：DE3115147A1

公开(公告)日：1982-11-04

申请号：DE3115147

申请日：1981-04-15

Applicant: BASF AG

Inventor： DITTER WALTER ,  EILINGSFELD HEINZ DIPL CHEM DR ,  ETZBACH KARL-HEINZ DIPL CHEM D ,  HORN DIETER DIPL CHEM DR

IPC: C09B1/02 ,  C09B1/20 ,  C09B1/503 ,  C09B1/58 ,  C09K3/34 ,  C09B1/00 ,  G09F9/35

Abstract: The invention relates to the use of dyes of the formula I in which R is a heterocyclic radical, X is hydrogen, nitro or optionally substituted amino, hydroxyl or mercapto, and Y is hydrogen, nitro or optionally substituted amino, hydroxyl or mercapto, where the ring A may also be substituted, and where Y is not NH2 if X is not hydrogen, in electro-optical displays containing liquid crystals, and to liquid-crystal mixtures containing dyes of the formula in Claim 1.

公开(公告)号：DE3048552A1

公开(公告)日：1982-08-05

申请号：DE3048552

申请日：1980-12-22

Applicant: BASF AG

Inventor： PATSCH MANFRED DIPL CHEM DR ,  HORN DIETER DIPL CHEM DR ,  DITTER WALTER

IPC: C09B1/22 ,  C09B1/32 ,  C09B1/503 ,  C09K19/60 ,  C09K3/34 ,  G02F1/13

Abstract: 1-Aminoanthraquinone dyestuffs (I) used in LCDs are of formula (I) (in which R is a carboxylic ester or amide gp. X is NO2, NH2, arylamino or OH gp.). (I) have a partic. high dichroitic ratio and good light fastness and solubility in liquid crystal media. They can also be prepd. easily in pure form. Specifically (IA) (in which R is COOMe and X is NH2) in a nematic phase had a dichroitic ratio, CR, of 9.7 and deg. of order, S= (CR-1)/(CR+2) of 0.74.

公开(公告)号：DE2934228A1

公开(公告)日：1981-03-12

申请号：DE2934228

申请日：1979-08-24

Applicant: BASF AG

Inventor： HEUCK CLAUS CHRISTIAN DIPL CHE ,  LUEDDECKE ERIK DIPL CHEM DR ,  HORN DIETER DIPL CHEM DR

IPC: G01N33/68 ,  G01N31/00 ,  G01N33/92 ,  G01N33/48

Abstract: Disclosed is the polyelectrolytic titration of serum lipoproteins, the negative surface charge of the latter being determined quantitatively by adding an excess amount of a polycation in aqueous solution to the particular serum lipoprotein and then back-titrating the positive charge, of the polycation, which has not been neutralized by the negative surface charge, against a chromotropic polyanion, in the presence of a metachromatic dye as the indicator. The method according is used for the diagnosis of lipometabolic disorders.

公开(公告)号：DE2728951A1

公开(公告)日：1979-01-18

申请号：DE2728951

申请日：1977-06-27

Applicant: BASF AG

Inventor： HORN DIETER DIPL CHEM DR ,  BECKER I KLAUS ING GRAD

IPC: G01N21/25 ,  G01N21/24 ,  G01N31/16

Abstract: Automatic colorimetric titrator uses >=1 light source to irradiate the liquid being titrated. Behing the vessel contg. the sample is a light sensitive cell which emits a signal to control the input of reagent proportional to the light being transmitted by the liquid. Light emitting diodes are used emitting light in the wavelength bands 150 - 3500 (500 - 1500) nm. These are actuated by impulses in a frequency range between 0.1-100 (1-5)K esp. 1 to 5 kHz, and alternately transmit a beam through the sample. The frequencies selected correspond to the colours of the sample before and after the colour change. The detector cell generates an a.c. potential signal on the colour change. Laser diodes can be used. Used for carrying out the automatic titration of solns. and permits the use of any convenient vessel with the need for additional manipulation.

公开(公告)号：DE2721955A1

公开(公告)日：1978-11-23

申请号：DE2721955

申请日：1977-05-14

Applicant: BASF AG

Inventor： KURTZ WALTER DIPL CHEM DR ,  HORN DIETER DIPL CHEM DR ,  DITTER WALTER

IPC: C09B29/01 ,  C09B29/42 ,  C09B44/08 ,  C09B29/36 ,  C09B39/00

Abstract: Azo dyes which in the form of the free bases correspond to the general formula where R1 is hydrogen, chlorine, bromine, methyl, trifluoromethyl, methoxy, nitro or a radical X, R2 is hydrogen, chlorine or nitro, R3 is hydrogen, chlorine, bromine, methyl, methoxy, nitro or a radical X, R4 is hydrogen or alkyl of 1 to 3 carbon atoms, R5 is cyano, carbamoyl or acetyl, R6 is hydrogen, substituted or unsubstituted alkyl or cycloalkyl or a radical X and X is a radical containing an amino group, the molecule containing at least one radical X. The compounds of the formula I are exceptionally useful for improving the flow of pigment-containing printing inks.