FR2405983A1 - Procede pour granuler des pigments - Google Patents

Procede pour granuler des pigments

Info

Publication number
FR2405983A1
FR2405983A1 FR7829380A FR7829380A FR2405983A1 FR 2405983 A1 FR2405983 A1 FR 2405983A1 FR 7829380 A FR7829380 A FR 7829380A FR 7829380 A FR7829380 A FR 7829380A FR 2405983 A1 FR2405983 A1 FR 2405983A1
Authority
FR
France
Prior art keywords
granulating
pigments
granulation aid
pigment
fluent
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.)
Granted
Application number
FR7829380A
Other languages
English (en)
Other versions
FR2405983B1 (fr
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.)
Novartis AG
Original Assignee
Ciba Geigy AG
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 Ciba Geigy AG filed Critical Ciba Geigy AG
Publication of FR2405983A1 publication Critical patent/FR2405983A1/fr
Application granted granted Critical
Publication of FR2405983B1 publication Critical patent/FR2405983B1/fr
Granted legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
    • B01J2/16—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by suspending the powder material in a gas, e.g. in fluidised beds or as a falling curtain
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
    • B01J2/28—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic using special binding agents
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
    • C09B67/00—Influencing the physical, e.g. the dyeing or printing properties of dyestuffs without chemical reactions, e.g. by treating with solvents grinding or grinding assistants, coating of pigments or dyes; Process features in the making of dyestuff preparations; Dyestuff preparations of a special physical nature, e.g. tablets, films
    • C09B67/0071—Process features in the making of dyestuff preparations; Dehydrating agents; Dispersing agents; Dustfree compositions
    • C09B67/0092—Dyes in solid form
    • C09B67/0095—Process features in the making of granulates
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
    • C09C3/006—Combinations of treatments provided for in groups C09C3/04 - C09C3/12
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
    • C09C3/04—Physical treatment, e.g. grinding, treatment with ultrasonic vibrations
    • C09C3/045—Agglomeration, granulation, pelleting
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
    • C09C3/08—Treatment with low-molecular-weight non-polymer organic compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
    • C09C3/10—Treatment with macromolecular organic compounds
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/50—Agglomerated particles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S264/00—Plastic and nonmetallic article shaping or treating: processes
    • Y10S264/51—Use of fluidized bed in molding

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Pigments, Carbon Blacks, Or Wood Stains (AREA)
  • Paints Or Removers (AREA)
  • Processes Of Treating Macromolecular Substances (AREA)
  • Glanulating (AREA)
  • Developing Agents For Electrophotography (AREA)

Abstract

Procédé de fabrication d'un granulé de pigment sec et fluent qui n'engendre que peu de poussière. On traite un pigment pulvérulent, dans une chambre à lit fluidisé 3, par un adjuvant de granulation et par de l'eau, et on retire le granulé formé Cet adjuvant de granulation est par exemple un liant, tel que l'hydroxyéthyl-cellulose, l'alcool polyvinylique ou la polyvinylpyrrolidone. Application la fabrication de vernis et à la coloration, dans la masse, de matières plastiques.
FR7829380A 1977-10-15 1978-10-16 Procede pour granuler des pigments Granted FR2405983A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4300177 1977-10-15

Publications (2)

Publication Number Publication Date
FR2405983A1 true FR2405983A1 (fr) 1979-05-11
FR2405983B1 FR2405983B1 (fr) 1982-06-11

Family

ID=10426908

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7829380A Granted FR2405983A1 (fr) 1977-10-15 1978-10-16 Procede pour granuler des pigments

Country Status (8)

Country Link
US (1) US4264552A (fr)
JP (1) JPS5465731A (fr)
CA (1) CA1122784A (fr)
CH (1) CH635862A5 (fr)
DE (1) DE2844710A1 (fr)
DK (1) DK155819C (fr)
FR (1) FR2405983A1 (fr)
NL (1) NL7810333A (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2438073A1 (fr) * 1978-10-06 1980-04-30 Ciba Geigy Ag Granulation de pigments
EP0024655A2 (fr) * 1979-08-22 1981-03-11 Ciba-Geigy Ag Ganulés de colorants complexes métallifères et procédé pour leur préparation
FR2468633A1 (fr) * 1979-09-21 1981-05-08 Ugine Kuhlmann Procede de preparation de colorants complexes metalliferes azoiques 1/2 dissymetriques monosulfones sous forme de granules non poussiereux, solubles dans l'eau et granules ainsi obtenus
EP0028379A1 (fr) * 1979-10-30 1981-05-13 Ciba-Geigy Ag Granules de colorants solubles dans l'eau, procédé pour leur préparation et leur utilisation pour la teinture
EP0376884A2 (fr) * 1988-12-21 1990-07-04 Ciba-Geigy Ag Granulat coulant
EP0418683A2 (fr) * 1989-09-21 1991-03-27 Bayer Ag Microgranulés de pigment de rutile à phases mixtes, procédé de fabrication et utilisation
WO1998017729A1 (fr) * 1996-10-22 1998-04-30 Ciba Specialty Chemicals Holding Inc. Granulation de pigment
EP0906938A1 (fr) * 1997-10-01 1999-04-07 Ciba SC Holding AG Granulation d'un pigment
FR2789687A1 (fr) * 1999-02-12 2000-08-18 Lcw Les Colorants Wackherr Materiau pigmentaire dispersable en milieu aqueux
EP1188798A1 (fr) * 1997-10-01 2002-03-20 Ciba SC Holding AG Granulés de pigment

Families Citing this family (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4277288A (en) * 1978-10-06 1981-07-07 Ciba-Geigy Corporation Fluidized granulation of pigments using organic granulating assistant
DE2925545A1 (de) * 1979-06-25 1981-01-29 Bayer Ag Verfahren zur herstellung eines mittels, das organische, cyclische, keto- und/oder hydrogruppen enthaltende verbindungen und tenside enthaelt, sowie verfahren zur zellstoffgewinnung unter verwendung dieses mittels
GB8320487D0 (en) * 1983-07-29 1983-09-01 Silberline Ltd Metal pigment compositions
CH658667A5 (de) * 1984-05-04 1986-11-28 Ciba Geigy Ag Verfahren zur herstellung von farbstoffgranulaten.
JPS61157561A (ja) * 1984-12-28 1986-07-17 Kuraray Co Ltd マイカ組成物
JPS649272A (en) * 1987-07-01 1989-01-12 Nippon Kayaku Kk Non-flying granular dye
FR2623793B1 (fr) * 1987-11-30 1991-06-07 Rhone Poulenc Chimie Procede de preparation de granules a base d'oxyde de titane, de zirconium, ou de cerium et produits ainsi obtenus
US4961755A (en) * 1987-12-29 1990-10-09 Ciba-Geigy Corporation Coated active substances: dye coated with polyethylene oxide-propylene oxide or with ethoxylated stearyldi phenyloxyethyl diethylenetriamine
JP2521618B2 (ja) * 1992-01-31 1996-08-07 住化カラー株式会社 顆粒状易分散性顔料、その製法及びそれを用いた印刷インキの製造方法
DK62994A (da) * 1993-11-15 1995-05-16 Niro Holding As Apparat og fremgangsmåde til fremstilling af et agglomereret materiale
JP3388894B2 (ja) * 1994-07-27 2003-03-24 富士写真フイルム株式会社 固体微粒子分散物とその製造方法
DE4429147A1 (de) * 1994-08-17 1996-02-22 Glatt Ingtech Gmbh Verfahren zur Herstellung von granulierten Zusatzstoffen für Baustoffe
US6124379A (en) * 1995-09-18 2000-09-26 Chobert; Helen M. Method for preparing a pigment for polyvinylchloride coloring
DE19649756B4 (de) * 1996-04-18 2005-05-25 Bayer Chemicals Ag Verfahren zur Herstellung von Brikettier- und Preßgranulaten aus Rußpigmenten und deren Verwendung
JP3096666B2 (ja) * 1996-11-01 2000-10-10 藤崎電機株式会社 粉体を造粒する方法及びその装置
DE19704943A1 (de) * 1997-02-10 1998-08-13 Bayer Ag Anorganische Pigmentgranulate zum Einfärben von Kunststoffen, Lacken und Baustoffen und ein Verfahren zu deren Herstellung
DE19706899C1 (de) * 1997-02-21 1998-11-05 Bayer Ag Anorganische, kompaktierte Pigmentgranulate, Verfahren zu ihrer Herstellung und ihre Verwendung
US5853476A (en) * 1997-08-11 1998-12-29 Elementis Pigments, Inc. Process for coloring concrete using compacted inorganic granules
DE19735487A1 (de) * 1997-08-16 1999-02-18 Basf Ag Pigmentzubereitungen in Granulatform auf Basis von mit Harzgemischen belegten organischen Pigmenten
DE10046152A1 (de) * 2000-09-15 2002-03-28 Merck Patent Gmbh Pigmentpräparation in Granulatform
DE19950712A1 (de) * 1999-10-21 2001-04-26 Vti Thueringer Verfahrenstechn Farbpigmentgranulat
DE10023286A1 (de) * 2000-05-12 2001-11-15 Merck Patent Gmbh Pigmentpräparation mit modifizierten Kolophoniumharzen
US6824821B1 (en) 2000-07-21 2004-11-30 Zachary Gillman Process for preparing compacted pigment granules, process for preparing encapsulated pigment granules, and process for dyeing landscaping and/or construction materials
US6743835B2 (en) * 2000-12-07 2004-06-01 Goldschmidt Ag Preparation of nondusting free-flowing pigment concentrates
DE10062942A1 (de) * 2000-12-16 2002-07-11 Degussa Perlruß
DE10249747A1 (de) * 2002-10-25 2004-05-06 Clariant Gmbh Verfahren und Vorrichtung zur Durchführung chemischer und physikalischer Prozesse
AU2003294031A1 (en) * 2002-12-04 2004-06-23 Ciba Specialty Chemicals Holding Inc. Dust-free pigment compositions obtainable by spray-drying
DE10350188A1 (de) * 2003-10-28 2005-06-16 Degussa Ag Rußgranulate
US20060042514A1 (en) * 2004-08-30 2006-03-02 Bodycomb Frederick M Agglomerated waste expanded perlite
DE102005019431A1 (de) * 2005-04-25 2006-10-26 Eckart Gmbh & Co. Kg Pulverförmige Perlglanzzusammensetzung, Verfahren zu deren Herstellung und deren Verwendung
DE102006017109A1 (de) * 2006-04-10 2007-10-11 Lanxess Deutschland Gmbh Verfahren zur Herstellung von Pigmentgranulaten und deren Verwendung
SG148806A1 (en) * 2006-07-28 2009-01-29 Inxel Trademark & Patents Sagl Coating of inorganic pigments with aldehyde or ketone resins
DE102007023913A1 (de) 2007-05-23 2008-11-27 Lanxess Deutschland Gmbh Pigmentzubereitungen von pastöser oder gelförmiger Konsistenz
DE102007023912A1 (de) 2007-05-23 2008-11-27 Lanxess Deutschland Gmbh Pigmentzubereitungen von pastöser oder gelförmiger Konsistenz
ES2563804T3 (es) * 2010-02-03 2016-03-16 Aditya Birla Science And Technology Company Limited Procedimiento para la preparación de gránulos de negro de carbón
JP6318013B2 (ja) * 2013-06-13 2018-04-25 花王株式会社 洗浄剤組成物
JP6190789B2 (ja) * 2014-10-10 2017-08-30 大日精化工業株式会社 湿り顔料、これを用いたカラーマスターバッチ、湿り顔料の製造方法及びマスターバッチの製造方法

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB978264A (fr) * 1960-02-26
GB495131A (en) * 1937-07-24 1938-11-08 Straba Strassenbaubedarfs Ag Method of and apparatus for producing a pulverulent material containing a bituminous constituent
GB573935A (en) * 1943-01-21 1945-12-13 Albert Sommer Pulverulent plastic compositions including bituminous or resinous binding agents
GB1020544A (en) * 1961-07-26 1966-02-23 Walter Beushausen Improvements in or relating to the preparation of dry powders for preventing smudging of freshly printed articles
FR2212401A1 (fr) * 1972-12-29 1974-07-26 Basf Ag
GB1401304A (en) * 1972-06-30 1975-07-16 Ciba Geigy Ag Process for producing a granular material from a solution and or suspension
GB1481034A (en) * 1974-10-24 1977-07-27 Rank Xerox Ltd Method of producing coated carrier particles for toner particles
US4098858A (en) * 1975-05-19 1978-07-04 The Goodyear Tire & Rubber Company Dustless free flowing rubber additives
FR2387270A1 (fr) * 1977-04-14 1978-11-10 Hoechst Ag Procede de preparation de particules de colorants solubles dans l'eau et n'engendrant pas de poussiere

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3755244A (en) * 1971-06-02 1973-08-28 Hercules Inc Polyolefin pigment dispersions
CH558674A (de) * 1971-07-01 1975-02-14 Ciba Geigy Ag Verfahren und vorrichtung zur herstellung eines granulats.
JPS5418330B2 (fr) * 1973-03-16 1979-07-06
US4073838A (en) * 1974-08-12 1978-02-14 Boehringer Ingelheim Gmbh Granulating process
DK152371C (da) * 1975-01-08 1988-07-25 Ciba Geigy Ag Organisk pigmentpraeparat

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB495131A (en) * 1937-07-24 1938-11-08 Straba Strassenbaubedarfs Ag Method of and apparatus for producing a pulverulent material containing a bituminous constituent
GB573935A (en) * 1943-01-21 1945-12-13 Albert Sommer Pulverulent plastic compositions including bituminous or resinous binding agents
GB978264A (fr) * 1960-02-26
GB1020544A (en) * 1961-07-26 1966-02-23 Walter Beushausen Improvements in or relating to the preparation of dry powders for preventing smudging of freshly printed articles
GB1401304A (en) * 1972-06-30 1975-07-16 Ciba Geigy Ag Process for producing a granular material from a solution and or suspension
FR2212401A1 (fr) * 1972-12-29 1974-07-26 Basf Ag
GB1481034A (en) * 1974-10-24 1977-07-27 Rank Xerox Ltd Method of producing coated carrier particles for toner particles
US4098858A (en) * 1975-05-19 1978-07-04 The Goodyear Tire & Rubber Company Dustless free flowing rubber additives
FR2387270A1 (fr) * 1977-04-14 1978-11-10 Hoechst Ag Procede de preparation de particules de colorants solubles dans l'eau et n'engendrant pas de poussiere

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2438073A1 (fr) * 1978-10-06 1980-04-30 Ciba Geigy Ag Granulation de pigments
EP0024655A2 (fr) * 1979-08-22 1981-03-11 Ciba-Geigy Ag Ganulés de colorants complexes métallifères et procédé pour leur préparation
EP0024655A3 (fr) * 1979-08-22 1981-03-25 Ciba-Geigy Ag Ganulés de colorants complexes métallifères et procédé pour leur préparation
FR2468633A1 (fr) * 1979-09-21 1981-05-08 Ugine Kuhlmann Procede de preparation de colorants complexes metalliferes azoiques 1/2 dissymetriques monosulfones sous forme de granules non poussiereux, solubles dans l'eau et granules ainsi obtenus
EP0028379A1 (fr) * 1979-10-30 1981-05-13 Ciba-Geigy Ag Granules de colorants solubles dans l'eau, procédé pour leur préparation et leur utilisation pour la teinture
EP0376884A3 (fr) * 1988-12-21 1991-06-05 Ciba-Geigy Ag Granulat coulant
EP0376884A2 (fr) * 1988-12-21 1990-07-04 Ciba-Geigy Ag Granulat coulant
EP0418683A3 (en) * 1989-09-21 1991-11-13 Bayer Ag Mixed phases containing rutile pigment microbeads, process for manufacturing them and their use
EP0418683A2 (fr) * 1989-09-21 1991-03-27 Bayer Ag Microgranulés de pigment de rutile à phases mixtes, procédé de fabrication et utilisation
WO1998017729A1 (fr) * 1996-10-22 1998-04-30 Ciba Specialty Chemicals Holding Inc. Granulation de pigment
US6241813B1 (en) 1996-10-22 2001-06-05 Ciba Specialty Chemicals Corporation Pigment granulation
US6423132B2 (en) 1996-10-22 2002-07-23 Ciba Specialty Chemicals Corporation Pigment granulation
EP0906938A1 (fr) * 1997-10-01 1999-04-07 Ciba SC Holding AG Granulation d'un pigment
US5964938A (en) * 1997-10-01 1999-10-12 Ciba Specialty Chemicals Corporation Pigment granulation
EP1188798A1 (fr) * 1997-10-01 2002-03-20 Ciba SC Holding AG Granulés de pigment
FR2789687A1 (fr) * 1999-02-12 2000-08-18 Lcw Les Colorants Wackherr Materiau pigmentaire dispersable en milieu aqueux

Also Published As

Publication number Publication date
DK155819C (da) 1989-10-09
JPS6239181B2 (fr) 1987-08-21
JPS5465731A (en) 1979-05-26
FR2405983B1 (fr) 1982-06-11
NL7810333A (nl) 1979-04-18
CA1122784A (fr) 1982-05-04
DE2844710C2 (fr) 1988-08-25
DK155819B (da) 1989-05-22
CH635862A5 (de) 1983-04-29
DE2844710A1 (de) 1979-04-26
DK457278A (da) 1979-04-16
US4264552A (en) 1981-04-28

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