Classifications

• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
  • C01B33/00—Silicon; Compounds thereof
  • C01B33/113—Silicon oxides; Hydrates thereof
  • C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
  • C01B33/14—Colloidal silica, e.g. dispersions, gels, sols
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
  • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
  • B41M5/52—Macromolecular coatings
  • B41M5/5218—Macromolecular coatings characterised by inorganic additives, e.g. pigments, clays
• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
  • C01B33/00—Silicon; Compounds thereof
  • C01B33/113—Silicon oxides; Hydrates thereof
  • C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
  • C01B33/14—Colloidal silica, e.g. dispersions, gels, sols
  • C01B33/141—Preparation of hydrosols or aqueous dispersions
  • C01B33/1415—Preparation of hydrosols or aqueous dispersions by suspending finely divided silica in water
  • C01B33/1417—Preparation of hydrosols or aqueous dispersions by suspending finely divided silica in water an aqueous dispersion being obtained
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D17/00—Pigment pastes, e.g. for mixing in paints
  • C09D17/004—Pigment pastes, e.g. for mixing in paints containing an inorganic pigment
  • C09D17/007—Metal oxide

Definitions

• the present invention is directed to dispersions, a process for preparing these dispersions and their use in the preparation of coating mixtures for inkjet media.
• dispersions for example water-based dispersions
• Aqueous dispersions can be used to prepare coating mixtures which are applied to paper or films.
• the coated films may then be printed using an inkjet printer.
• one objective is to obtain dispersions which are filled as highly as possible (high solids content) but with a low viscosity.
• the invention provides dispersions which are characterised in that they consist of a liquid phase, preferably water, and a solid phase.
• the solid phase consists of a pyrogenic oxide, doped using an aerosol, the BET surface area of which is between 5 and 600 m 2 /g.
• the pyrogenic oxide preferably comprises silica prepared by the method of flame hydrolysis or flame oxidation and which has been doped with one or more doping component(s).
• the doping component is an aluminium oxide, and doping is accomplished by the method of aerosol application, in which the amount of doped material is between 1 and 200,000 ppm and the doping component(s) are applied via a salt or a salt mixture.
• the solid phase in the dispersion should be present in a proportion by weight between 0.001 and 80 wt. %.
• the invention also provides a process for preparing chemical dispersions in which a pyrogenic oxide, doped using an aerosol, is introduced into a liquid, preferably water, in a proportion by weight of between 0.001 and 80 wt. %.
• a liquid preferably water
• 85 kg/h of SiCl 4 are evaporated, mixed with 51 Nm 3 /h of hydrogen and with 70 Nm 3 /h of a nitrogen/oxygen mixture (containing 35 vol. % O 2 , remainder N 2 ) and fed into the central tube in the burner.
• the gas mixture flows out of a nozzle and bums in a water-cooled combustion chamber.
• 4 Nm 3 /h of (jacket) hydrogen flows out of the jacket nozzle which surrounds the central nozzle, in order to avoid incrustations.
• 70 Nm 3 /h of secondary air are also introduced into the combustion chamber.
• An aerosol flows into the central tube out of an axial tube located therein.
• the aerosol is produced by atomising a 15% aqueous AlCl 3 solution using a two-fluid nozzle.
• An aerosol flow of 1 kg/h (aqueous salt solution) is produced in which a carrier gas stream of 16 Nm 3 /h of air conveys the aerosol through a heating section.
• the air/aerosol gas mixture then enters the central tube from the axial tube at about 180° C.
• the aerosol is burned together with the air/SiCl 4 mixture.
• the reaction gases and the pyrogenically prepared silica doped with aluminium oxide are removed under suction through a cooling system, and cooled by applying a reduced pressure.
• the solid material (doped pyrogenic oxide) is separated from the gas stream in a filter or a cyclone.
• the doped pyrogenically prepared silica is produced as a white, finely divided powder. Adhering residues of hydrochloric acid are removed by treatment at elevated temperature with air which contains water vapour.
• the pyrogenic silicon dioxide doped using an aerosol has the following physico-chemical characteristics: BET: 60 m 2 /g pH (4% aqu. disp.): 3.9 Compacted bulk density: 142 g/l Chloride content: 180 ppm Al 2 O 3 content 0.19 wt. % DBP absorption: 73 g/100 g
• An aqueous dispersion is prepared with the doped pyrogenic oxide.
• a commercially available Aerosils pyrogenically prepared silica provided by Degussa-Hüls AG/Frankfurt, OX 50 and Aerosil 90, are used as comparison examples.
• Table 1 gives the characteristics of the oxides: TABLE 1 Physico-chemical characteristics of the doped pyrogenic oxide Doped pyrogenic oxide according to example OX 50 Aerosil 90 BET m 2 /g 60 50 90 pH (4% aqu. disp.) 3.9 3.8-4.8 3.7-4.7 Compacted bulk density 142 130 80 g/l Chloride content 180 ⁇ 250 ⁇ 250 ppm Al 2 O 3 content wt. % 0.19 ⁇ 0.08 0.05 SiO 2 content wt. % 99.8 >99.8 >99.8
• the viscosity of the dispersions prepared in this way is measured after 2 h with a Brookfield viscometer. TABLE 2 Viscosity of the 40% aqueous dispersion
• Doped pyrogenic Aerosil 90 oxide according not possible to prepare a 40% to example 1 OX 50 dispersion using Ultra-Turrax 5 rpm 2420 2320 >10,000 l0 rpm 1520 1320 20 rpm 970 745 50 rpm 554 372 100 rpm 370 256
• Inkjet coating mixtures are prepared from these 40% aqueous dispersions.
• Dispersion B is a 10% (with respect to PVA) aqueous dispersion of polyvinyl alcohol (solid, abbreviated as PVA), Mowiol 26-88 from the Clariant Co.
• PVA polyvinyl alcohol
• the two dispersions A and B are combined over the course of 10 minutes by stirring at 500 rpm with a dissolver disc to give a dispersion C.
• Dispersions A and B are mixed in such a way that a ratio by weight of Aerosil (or doped pyrogenic oxide) to PVA of 100:20 is produced in subsequent dispersion C. In the case of a 40% dispersion A, this is mixed with dispersion B in the ratio by weight of 1.25:1 in order to achieve the required ratio by weight (100:20 for the solids).
• These coating mixtures are applied to an untreated polyester film (thickness 100 micrometers) with the aid of a shaped spreading rod.
• the wet film thickness of the coating mixture is 120 micrometers.
• the coating is dried at 105° C. for 8 minutes. The also very good.
• dispersions made with Aerosil OX 50 also have a relatively low viscosity, the print quality of the coating mixtures, or coatings, prepared therefrom is not acceptable.

Landscapes

• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Inorganic Chemistry (AREA)
• Dispersion Chemistry (AREA)
• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Wood Science & Technology (AREA)
• Silicon Compounds (AREA)
• Inks, Pencil-Leads, Or Crayons (AREA)
• Pigments, Carbon Blacks, Or Wood Stains (AREA)
• Ink Jet Recording Methods And Recording Media Thereof (AREA)
• Crushing And Grinding (AREA)
• Paints Or Removers (AREA)
• Medicinal Preparation (AREA)
• Cosmetics (AREA)
• Compositions Of Macromolecular Compounds (AREA)
• Colloid Chemistry (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Related Child Applications (1)

Publications (1)

Family

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Family Applications (2)

Family Applications After (1)

Country Status (12)

Cited By (8)

Families Citing this family (10)

Family Cites Families (10)

• 2000
  • 2000-04-12 EP EP00107817.9A patent/EP1148026B1/fr not_active Expired - Lifetime
• 2001
  • 2001-03-16 TW TW090106268A patent/TW527317B/zh not_active IP Right Cessation
  • 2001-04-09 JP JP2001110419A patent/JP3909217B2/ja not_active Expired - Fee Related
  • 2001-04-10 US US09/829,014 patent/US20010042493A1/en not_active Abandoned
  • 2001-04-10 IL IL14250601A patent/IL142506A0/xx unknown
  • 2001-04-10 SG SG200102083A patent/SG94804A1/en unknown
  • 2001-04-11 NO NO20011872A patent/NO333429B1/no not_active IP Right Cessation
  • 2001-04-11 PL PL01347019A patent/PL347019A1/xx not_active Application Discontinuation
  • 2001-04-11 KR KR10-2001-0019259A patent/KR100459963B1/ko not_active IP Right Cessation
  • 2001-04-11 ZA ZA200103011A patent/ZA200103011B/xx unknown
  • 2001-04-11 CA CA002343831A patent/CA2343831C/fr not_active Expired - Fee Related
  • 2001-04-11 BR BR0101455-2A patent/BR0101455A/pt not_active IP Right Cessation
• 2002
  • 2002-11-18 US US10/295,895 patent/US6695907B2/en not_active Expired - Lifetime

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