EP1817117A2 - Dispersions de boehmite a haute teneur en solides et substrats revetus fabriques a partir de ces dispersions - Google Patents

Dispersions de boehmite a haute teneur en solides et substrats revetus fabriques a partir de ces dispersions

Info

Publication number
EP1817117A2
EP1817117A2 EP05852561A EP05852561A EP1817117A2 EP 1817117 A2 EP1817117 A2 EP 1817117A2 EP 05852561 A EP05852561 A EP 05852561A EP 05852561 A EP05852561 A EP 05852561A EP 1817117 A2 EP1817117 A2 EP 1817117A2
Authority
EP
European Patent Office
Prior art keywords
boehmite alumina
dispersions
alumina
boehmite
dispersion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP05852561A
Other languages
German (de)
English (en)
Inventor
David A. Barclay
Lyndol G. Clopton
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sasol North America Inc
Original Assignee
Sasol North America Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sasol North America Inc filed Critical Sasol North America Inc
Publication of EP1817117A2 publication Critical patent/EP1817117A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances

Definitions

  • the present invention relates to aqueous dispersions of boehmite alumina and, more particularly, to such dispersions containing a high solids content of boehmite alumina.
  • the present invention also relates to coated substrates, e.g., recording sheets and the like, made from the boehmite alumina dispersions.
  • Aqueous dispersions of alumina, particularly boehmite alumina, are well known and have wide utility in many industrial applications.
  • such dispersions are used as coatings on substrates of various types.
  • a coated substrate which is made from aqueous dispersions of boehmite alumina is a recording sheet used with ink jet printers.
  • the desired property of an aqueous alumina dispersion is to have as high a solids content as possible but with low viscosity and no other deleterious rheological properties. Furthermore over time, the dispersion should be stable (non-settling) and not become viscous.
  • the present invention provides a composition
  • a composition comprising an aqueous dispersion containing from 25 to 40% by wt. total solids of a particulate boehmite alumina, having a surface area of from 100 to 160 m 2 /g, and a crystallite size (120 plane) of from 140 to 350 Ang., the dispersion having a pH in the range of from 3-5.
  • the present invention provides a process for producing coated substrates comprising providing a suitable substrate, applying an aqueous boehmite alumina substrate as described above to the substrate to produce a wet coated substrate and drying the wet coated substrate.
  • a recording sheet which comprises a substrate having a surface and a layer of an adsorbent on the surface of the substrate, the adsorbent being capable of receiving an image forming medium, e.g., ink, to form an image, the adsorbent layer comprising a particulate boehmite alumina having a surface area of from 100 to 160 m 2 /g and a crystallite size of from 140 to 350 Ang..
  • Figure 1 is a graph showing the effect of surface area on viscosity for dispersions of various solids loading.
  • Figure 2 is a graph showing the effect of pH on viscosity for dispersions of various solids loading.
  • Figure 3 is a graph showing the long-term stability of concentrated dispersions of aluminas of varying surface area.
  • Figure 4 is a graph showing dispersion viscosity as a function of alumina
  • n is an integer from 0 to 3 and m is a value within the range of from 0 to 10, preferably from 0 to 5, provided that m and n are not zero at the same time.
  • the water grouping, mH 2 O indicates water of hydration (free water) which for the most part is not involved in the crystal lattice and accordingly can assume a non- integral value.
  • boehmite aluminas can be essentially a total boehmite structure or a pseudoboehmite structure containing excess water between (020) planes.
  • a boehmite alumina according to the present invention includes both boehmite structures unless specified otherwise.
  • Numerous methods for producing boehmite aluminas or hydrated aluminas used in the present invention can be employed.
  • the aluminum hydrate can be produced by the Bayer process.
  • a preferred method of preparing the alumina hydrates of the present invention is disclosed in U.S. Patent 4,676,928, incorporated herein by reference for all purposes.
  • aluminas which are useful in the present invention can be obtained by the hydrolysis of aluminum alkoxides which are produced by reacting a low molecular weight alcohol, particularly a branched chain alcohol, with an aluminum bearing material.
  • aluminum bearing materials include pure aluminum as well as aluminum alloys and mixed alloy scrap. Typical methods for preparing such aluminum alkoxides are shown, for example, in U.S. Patent 4,242,271 , incorporated herein by reference for all purposes.
  • the aluminum alkoxide can be hydrolyzed, in a well known manner, such as by the process taught in U.S. Patent 4,202,870, incorporated herein by reference for all purposes.
  • aluminas obtained from the hydrolysis of aluminum alkoxides derived from Ziegler chemistry are especially preferred.
  • the boehmite aluminas of the present invention obtained by methods described above can be subjected to crystallite growth by a hydrothermal treatments such as set forth in U.S. Patents 4,676,928 and 5,055,019, incorporated herein by reference for all purposes.
  • hydrothermal treatment or other crystal growth techniques are employed until aluminas having the desired physical characteristics for use in the present invention are achieved.
  • the present invention is based upon the surprising finding that if the surface area of the particulate boehmite alumina is between 100 and 160 m 2 /g, the crystallite size between 140 to 350 Ang., and the pH of the aluminum dispersion or sol is in the range of 3 to 5 preferably 3 to 4, dispersions of up to 40% by wt., especially 32 to 40% by wt., solids can be made that are reasonably fluid and stable over time. In particular, dispersions containing 25 to 35% by wt. solids can be made that are virtually water thin and have long-term stability. Additionally, these dispersions exhibit Newtonian viscosity behavior.
  • the dispersions of the present invention require no stabilizers other than the acid used in the hydrothermal treatment process.
  • the boehmite aluminas of the present invention will have a crystallite size (120 x-ray plane) of from 140 to 350 Ang., preferably 200 to 300 Ang.
  • the boehmite alumina have a porosity of less than 1 ml/g and more preferably from about 0.4 to about 0.8 ml/g. It has been found that if the porosity of the alumina is too high, water absorption is increased so that the effective solids are increased in the dispersion with a concomitant increase in viscosity.
  • the aluminas of the present invention can be prepared by a variety of crystal growth processes, a particularly preferred method being the hydrothermal treatment disclosed in U.S. Patent 4,676,928.
  • the percent solids in the dispersions are calculated as boehmite alumina less free water, i.e., water that can be removed
  • boehmite aluminas typically contain from about 3 to about 6%
  • Figure 3 shows the long-term stability of various dispersions. As can be seen, with the surface areas of the aluminas within the range of 100 to 160m 2 /g, and crystallite sizes within the range of 140 to 350 Angstroms, all samples were stable for at least 38 days, where stable is defined as no substantial settling of the alumina from the sol.
  • Figure 4 shows the effect of crystallite size on dispersion viscosity. As can be seen from Figure 4, within a crystallite size (120 plane) range of from about 140 to 350 Angstroms, all of the dispersions had an acceptable viscosity.
  • alumina dispersions have a pH of from about 3 to about 5, the crystallite size of the alumina (120 plane) is from about 140 to 350 Angstroms and the surface area is from about 100 to 160 m 2 /g.
  • the boehmite dispersions of the present invention as described above, can be used in a wide variety of applications. Indeed, the alumina dispersions of the present invention are applicable to any use wherein it is desired to have a high solids content dispersion which has low viscosity and is therefore readily pumpable, spreadable or even sprayable. For example, in the process of making coated papers, films and other recording media, there is often a need to apply a high level of alumina solids to the substrate. Although this can be accomplished, with prior art dispersions, by applying repeated coats of a low solids dispersion to the substrate, obviously it is more desirable and far more economical if the desired thickness can be achieved with a single coating.
  • the dispersion can be applied to a suitable substrate, e.g., paper, film or the like, to produce a wet or coated substrate and the coated substrate dry to produce a recording sheet onto which an image forming medium can be applied.
  • a suitable substrate e.g., paper, film or the like
  • the dispersions of the present invention there can be formed a recording sheet comprising a substrate, e.g., paper, which has a surface, the surface having a layer of absorbent formed from the alumina dispersion.
  • the absorbent is capable of receiving an image forming medium such as ink, pigment, paint or the like, and will comprise a particulate boehmite alumina having a surface area of from 100 to 160 m 2 /g and a crystallite size (120 plane) of from 140 to 350 Angstroms.
  • an image forming medium such as ink, pigment, paint or the like
  • a particulate boehmite alumina having a surface area of from 100 to 160 m 2 /g and a crystallite size (120 plane) of from 140 to 350 Angstroms.
  • additives including various metal oxides, sols of divalent or polyvalent metals and cationic organic substances can be employed as the metal oxide, oxides or hydroxides such as silica, boria, silica boria, silica magnesia, titania, zirconia and zinc oxide.
  • sols of di- or polyvalent metals non-limiting examples include calcium carbonate and barium sulphate as well as calcium nitrate or halides such as magnesium chloride, calcium bromide, calcium iodine, etc.
  • cationic organic substance non- limiting examples include quaternary ammonium salts, polyamines and alkyl amines.
  • binders can also be employed, non-limiting examples of such binders including water soluble polymers such as polyvinyl alcohol and modified products thereof, starch and modified products thereof, gelatin and modified products thereof, casein and modified products thereof, gum arabic, etc.
  • organic acids can be employed in preparing the recording media or sheets of the present invention. Numerous, non-limiting examples of such organic acids are disclosed in U.S. Patent 6,565,950, incorporated herein by reference for all purposes.
  • alumina for dispersions of the present invention are used in forming recording media, there can also be incorporated viscosifiers, pH adjusting agents, lubricants, fluidity modifiers, surfactants, defoaming agents, water poufing agents, anti-foamers, releasing agents, etc.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
  • Ink Jet Recording Methods And Recording Media Thereof (AREA)

Abstract

L'invention concerne une composition comprenant une dispersion aqueuse contenant entre 25 et 40 % en masse d'une boehmite particulaire solide possédant une surface de contact comprise entre 100 et 160 m2/g et une taille de cristallite (120 plans) comprise entre 140 et 350 angström, la dispersion ayant un pH compris entre 3 et 5.
EP05852561A 2004-12-01 2005-11-30 Dispersions de boehmite a haute teneur en solides et substrats revetus fabriques a partir de ces dispersions Withdrawn EP1817117A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US188304A 2004-12-01 2004-12-01
PCT/US2005/043370 WO2006060510A2 (fr) 2004-12-01 2005-11-30 Dispersions de boehmite a haute teneur en solides et substrats revetus fabriques a partir de ces dispersions

Publications (1)

Publication Number Publication Date
EP1817117A2 true EP1817117A2 (fr) 2007-08-15

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP05852561A Withdrawn EP1817117A2 (fr) 2004-12-01 2005-11-30 Dispersions de boehmite a haute teneur en solides et substrats revetus fabriques a partir de ces dispersions

Country Status (2)

Country Link
EP (1) EP1817117A2 (fr)
WO (1) WO2006060510A2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2397029B1 (fr) * 2009-02-13 2013-09-18 Asahi Glass Company, Limited Film agricole
US10023785B2 (en) * 2012-01-31 2018-07-17 Sasol Performance Chemicals Gmbh Thixotropic agents and methods of use
JP7143440B2 (ja) 2018-04-27 2022-09-28 ビーエーエスエフ コーティングス ゲゼルシャフト ミット ベシュレンクテル ハフツング 水性コーティング材組成物におけるレオロジー助剤としての表面改質された水酸化酸化アルミニウム粒子

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4650699A (en) * 1983-04-18 1987-03-17 Sermetel Thixotropic alumina coating compositions, parts and methods
WO2001081078A1 (fr) * 2000-04-20 2001-11-01 Rexam Graphics Inc. Supports d'impression glaces
US6719420B2 (en) * 2001-05-10 2004-04-13 Canon Kabushiki Kaisha Liquid composition, ink set, method for forming colored portion on recording medium, and ink-jet recording apparatus

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006060510A3 *

Also Published As

Publication number Publication date
WO2006060510A2 (fr) 2006-06-08
WO2006060510A3 (fr) 2007-04-05

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