HRP20080211T3 - Mješavina veziva iz estera poliasparginske kiseline i poliizocijanata modificiranog sa sulfonatom - Google Patents

Mješavina veziva iz estera poliasparginske kiseline i poliizocijanata modificiranog sa sulfonatom

Info

Publication number
HRP20080211T3
HRP20080211T3 HR20080211T HRP20080211T HRP20080211T3 HR P20080211 T3 HRP20080211 T3 HR P20080211T3 HR 20080211 T HR20080211 T HR 20080211T HR P20080211 T HRP20080211 T HR P20080211T HR P20080211 T3 HRP20080211 T3 HR P20080211T3
Authority
HR
Croatia
Prior art keywords
polyiscocyanate
sulfonated
binder composition
coating system
polyaspartic ester
Prior art date
Application number
HR20080211T
Other languages
English (en)
Inventor
Mundstock Holger
Niesten Meike
Reidenbach Nicole
Schmitz J�rg
Original Assignee
Bayer Materialscience 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 Bayer Materialscience Ag filed Critical Bayer Materialscience Ag
Publication of HRP20080211T3 publication Critical patent/HRP20080211T3/hr

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
    • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/02—Polyureas
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/30—Low-molecular-weight compounds
    • C08G18/38—Low-molecular-weight compounds having heteroatoms other than oxygen
    • C08G18/3819—Low-molecular-weight compounds having heteroatoms other than oxygen having nitrogen
    • C08G18/3821—Carboxylic acids; Esters thereof with monohydroxyl compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/30—Low-molecular-weight compounds
    • C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
    • C08G18/3225—Polyamines
    • C08G18/3253—Polyamines being in latent form
    • C08G18/3256—Reaction products of polyamines with aldehydes or ketones
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
    • C08G18/72—Polyisocyanates or polyisothiocyanates
    • C08G18/77—Polyisocyanates or polyisothiocyanates having heteroatoms in addition to the isocyanate or isothiocyanate nitrogen and oxygen or sulfur
    • C08G18/775—Polyisocyanates or polyisothiocyanates having heteroatoms in addition to the isocyanate or isothiocyanate nitrogen and oxygen or sulfur sulfur
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
    • C08G18/72—Polyisocyanates or polyisothiocyanates
    • C08G18/77—Polyisocyanates or polyisothiocyanates having heteroatoms in addition to the isocyanate or isothiocyanate nitrogen and oxygen or sulfur
    • C08G18/78—Nitrogen
    • C08G18/79—Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates
    • C08G18/791—Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates containing isocyanurate groups
    • C08G18/792—Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates containing isocyanurate groups formed by oligomerisation of aliphatic and/or cycloaliphatic isocyanates or isothiocyanates
    • 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
    • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • 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
    • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/04—Polyurethanes
    • C09D175/12—Polyurethanes from compounds containing nitrogen and active hydrogen, the nitrogen atom not being part of an isocyanate group

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Polyurethanes Or Polyureas (AREA)
  • Paints Or Removers (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

Dvokomponeni sistemi za premaze za proizvodnju poliurea premaza, naznačeni time, da oni sadrže barem A) jedan poliizocijanat koji sadrži sulfonatne skupine i B) jedan ester poliasparaginske kiseline s amino funkcionalnim skupinama opće formule (I) ukojojX predstavlja n-valentan organski ostatak koji se dobije odstranjivanjem primarnih amino skupina s n-valentnog poliamina, R1 i R2 predstavljaju jednake ili različite organske ostatke koji su poduvjetima reakcije inertni prema izocijanatnim skupinama, i n je cijeli broj od najmanje 2. Patent sadrži još 10 patentnih zahtjeva.
HR20080211T 2005-04-30 2008-05-14 Mješavina veziva iz estera poliasparginske kiseline i poliizocijanata modificiranog sa sulfonatom HRP20080211T3 (hr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005020269A DE102005020269A1 (de) 2005-04-30 2005-04-30 Bindemittelgemische aus Polyasparaginsäureestern und sulfonatmodifizierten Polyisocyanaten

Publications (1)

Publication Number Publication Date
HRP20080211T3 true HRP20080211T3 (hr) 2008-06-30

Family

ID=36933508

Family Applications (1)

Application Number Title Priority Date Filing Date
HR20080211T HRP20080211T3 (hr) 2005-04-30 2008-05-14 Mješavina veziva iz estera poliasparginske kiseline i poliizocijanata modificiranog sa sulfonatom

Country Status (18)

Country Link
US (1) US20060247371A1 (hr)
EP (1) EP1726606B1 (hr)
JP (1) JP5273913B2 (hr)
KR (1) KR101277434B1 (hr)
CN (1) CN1880393A (hr)
AT (1) ATE388180T1 (hr)
AU (1) AU2006201793A1 (hr)
BR (1) BRPI0601475A (hr)
CA (1) CA2545037A1 (hr)
DE (2) DE102005020269A1 (hr)
DK (1) DK1726606T3 (hr)
ES (1) ES2302272T3 (hr)
HR (1) HRP20080211T3 (hr)
MX (1) MXPA06004603A (hr)
NZ (1) NZ546856A (hr)
PL (1) PL1726606T3 (hr)
PT (1) PT1726606E (hr)
SI (1) SI1726606T1 (hr)

Families Citing this family (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005047562A1 (de) * 2005-10-04 2007-04-05 Bayer Materialscience Ag Zweitkomponenten-Systeme für die Herstellung flexibler Beschichtungen
KR100728388B1 (ko) * 2007-02-14 2007-06-13 듀라케미 (주) 방청방수용 지방족화합물계 폴리우레아 코팅제
KR101611774B1 (ko) * 2011-07-01 2016-04-11 피피지 인더스트리즈 오하이오 인코포레이티드 실란을 함유하는 폴리우레아 코팅
JP2013151645A (ja) * 2011-12-27 2013-08-08 Sumika Bayer Urethane Kk 水性ウレタン系樹脂組成物
WO2014151307A1 (en) 2013-03-15 2014-09-25 Bayer Materialscience Llc Polyaspartic coating compositions
CN103351795B (zh) * 2013-08-01 2016-05-18 天津科瑞达涂料化工有限公司 聚天门冬汽车涂料及制备方法与应用
US10000686B2 (en) 2013-12-18 2018-06-19 Covestro Llc Methods for treating a well bore within an underground formation
RU2016139268A (ru) * 2014-03-14 2018-04-16 Акцо Нобель Коатингс Интернэшнл Б.В. Композиция для нанесения покрытия
JP6425422B2 (ja) * 2014-05-30 2018-11-21 アイカ工業株式会社 外壁タイル剥落防止構造及び外壁タイル剥落防止工法
JP6425432B2 (ja) * 2014-06-30 2018-11-21 アイカ工業株式会社 外壁タイル剥落防止構造及び外壁タイル剥落防止工法
JP6320223B2 (ja) * 2014-07-30 2018-05-09 アイカ工業株式会社 コンクリート片剥落防止構造及びこの剥落防止工法及びこれらに使用する脂環式ポリアミン
JP6425446B2 (ja) * 2014-07-30 2018-11-21 アイカ工業株式会社 外壁タイル剥落防止構造及び外壁タイル剥落防止工法
WO2016049104A1 (en) 2014-09-24 2016-03-31 Covestro Llc Flexible polyurea sealant compositions
WO2016210237A1 (en) 2015-06-26 2016-12-29 Covestro Llc Polyaspartic ester based coatings for metal surfaces
CN105949987B (zh) * 2016-07-11 2018-07-31 广东遂达工程技术有限公司 一种亚胺改性聚天门冬氨酸酯防水防腐涂料及制备方法与应用
US20180346786A1 (en) 2017-06-05 2018-12-06 Covestro Llc Methods and materials for refracturing a partially depleted oil and gas well
US20180362801A1 (en) 2017-06-19 2018-12-20 Covestro Llc Coatings with fast return to service
US20190203097A1 (en) 2017-08-08 2019-07-04 Covestro Llc Polyurethanes for water shut-off in oil and gas wells
EP3489316A1 (de) * 2017-11-22 2019-05-29 Covestro Deutschland AG Neue systeme für die grundierung und das kleben von bodenbelägen
US20190390065A1 (en) 2018-06-22 2019-12-26 Covestro Llc Waterborne compositions containing organic ion-exchangers to improve corrosion resistance
US20190390063A1 (en) 2018-06-22 2019-12-26 Covestro Llc Solventborne compositions containing organic ion-exchangers to improve corrosion resistance
US20190390066A1 (en) 2018-06-22 2019-12-26 Covestro Llc Waterborne compositions containing inorganic ion-exchangers to improve corrosion resistance
US20190390064A1 (en) 2018-06-22 2019-12-26 Covestro Llc Solventborne compositions containing inorganic ion-exchangers to improve corrosion resistance
EP3626755A1 (en) 2018-09-24 2020-03-25 Covestro Deutschland AG A coating composition
EP3824011B1 (en) 2018-07-20 2023-08-09 Covestro Intellectual Property GmbH & Co. KG A coating composition
CN110734693A (zh) * 2018-07-20 2020-01-31 科思创德国股份有限公司 一种涂料组合物
US10781339B2 (en) 2018-09-13 2020-09-22 Covestro Llc Reduced discoloration of polyaspartic resins blended with acrylate resins
EP3666811A1 (en) 2018-12-14 2020-06-17 Covestro Deutschland AG A coating composition
WO2020094689A1 (en) 2018-11-07 2020-05-14 Covestro Deutschland Ag A coating composition
US11673997B2 (en) * 2019-07-31 2023-06-13 Covestro Llc Work time to walk-on time ratio by adding a phenolic catalyst to polyaspartic flooring formulations
US11827788B2 (en) 2019-10-07 2023-11-28 Covestro Llc Faster cure polyaspartic resins for faster physical property development in coatings
CN110845685B (zh) * 2019-12-12 2021-11-09 中国科学院长春应用化学研究所 一种修补汽车仪表板聚氨酯泡沫的聚天门冬氨酸酯聚脲基修补材料、其制备方法及修补方法
CN113122129A (zh) * 2021-04-19 2021-07-16 北京碧海云智新材料技术有限公司 一种低粘度无溶剂聚脲涂料及其制备方法和应用
FR3123653A1 (fr) 2021-06-04 2022-12-09 Vencorex France Compositions polyaspartiques
EP4105017B1 (de) 2021-06-17 2023-06-07 Schiefergruben Magog GmbH & Co. KG Dünnsteinerzeugnis
CN114456691A (zh) * 2022-01-26 2022-05-10 深圳飞扬骏研新材料股份有限公司 延长天冬聚脲涂料活化期的方法及涂料
EP4406986A1 (en) 2023-01-24 2024-07-31 Covestro Deutschland AG Resin composition for preparing a thermoplastic polymer matrix
WO2024099826A1 (en) 2022-11-07 2024-05-16 Covestro Deutschland Ag Resin composition for preparing a thermoplastic polymer matrix

Family Cites Families (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1064841A (en) 1963-02-04 1967-04-12 Ici Ltd Manufacture of polymers containing biuret and urea groups
GB1101410A (en) 1965-06-23 1968-01-31 American Cyanamid Co Polyurethane prepolymers
US4385171A (en) 1982-04-30 1983-05-24 Olin Corporation Research Center Removal of unreacted diisocyanate from polyurethane prepolymers
DE3308418A1 (de) 1983-03-09 1984-09-13 Bayer Ag, 5090 Leverkusen Verfahren zur herstellung von kombinationen aus organischen polyisocyanaten und zumindest teilweise blockierten polyaminen, die nach dem verfahren erhaeltlichen kombinationen und ihre verwendung zur herstellung von lacken, beschichtungs- oder dichtungsmassen
FR2603278B1 (fr) 1986-09-03 1988-11-18 Rhone Poulenc Chimie Procede de preparation de polyisocyanate a groupement biuret
DE3700209A1 (de) 1987-01-07 1988-07-21 Bayer Ag Verfahren zur herstellung von polyisocyanaten mit biuretstruktur
DE3806276A1 (de) 1988-02-27 1989-09-07 Bayer Ag Verfahren zur herstellung von isocyanuratgruppen aufweisenden polyisocyanaten und ihre verwendung
DE3900053A1 (de) 1989-01-03 1990-07-12 Bayer Ag Verfahren zur herstellung von uretdion- und isocyanuratgruppen aufweisenden polyisocyanaten, die nach diesem verfahren erhaeltlichen polyisocyanate und ihre verwendung in zweikomponenten-polyurethanlacken
ES2062188T3 (es) 1989-06-23 1994-12-16 Bayer Ag Procedimiento para la elaboracion de revestimientos.
DE4025347A1 (de) * 1990-08-10 1992-02-13 Bayer Ag Verwendung von zweikomponenten-bindemittelkombinationen in autoreparaturlacken
US5124427A (en) 1991-01-22 1992-06-23 Miles Inc. Polyisocyanates containing allophanate and isocyanurate groups, a process for their production and their use in two-component coating compositions
CA2072916C (en) 1991-07-22 2003-02-11 Terry A. Potter A process for the production of polyisocyanates containing allophanate and isocyanurate groups
DE4415778A1 (de) * 1994-05-05 1995-11-09 Bayer Ag Verfahren zur Herstellung von Überzügen
US5489704A (en) * 1994-08-29 1996-02-06 Bayer Corporation Polyisocyanate/polyamine mixtures and their use for the production of polyurea coatings
US5736604A (en) * 1996-12-17 1998-04-07 Bayer Corporation Aqueous, two-component polyurea coating compositions
DE19822842A1 (de) * 1998-05-22 1999-11-25 Bayer Ag 2K-PUR-Korrosionsschutz-Decklack
TW510916B (en) * 1998-12-21 2002-11-21 Bayer Ag Aqueous reacitve filler compositions
EP1038897A3 (en) * 1999-03-23 2001-10-04 Air Products And Chemicals, Inc. Polyaspartic esters containing additional isocyanate-reactive functionality for spray polyurea coatings
DE10024624A1 (de) * 2000-05-18 2001-11-22 Bayer Ag Modifizierte Polyisocyanate
US6613389B2 (en) * 2001-12-26 2003-09-02 Dow Global Technologies, Inc. Coating process and composition for same
DE10213229A1 (de) * 2002-03-25 2003-10-16 Bayer Ag Wässrige 2K-PUR-Systeme
US6774206B2 (en) * 2002-09-26 2004-08-10 Bayer Polymers Llc Polyaspartate resins with improved flexibility
US6790925B2 (en) * 2002-12-05 2004-09-14 Bayer Polymers Llc In-situ preparation of polyaspartic ester mixtures
US20050059790A1 (en) * 2003-09-16 2005-03-17 Roesler Richard R. Process for preparing aspartates

Also Published As

Publication number Publication date
NZ546856A (en) 2007-09-28
MXPA06004603A (es) 2007-12-11
PT1726606E (pt) 2008-05-16
ES2302272T3 (es) 2008-07-01
PL1726606T3 (pl) 2008-07-31
BRPI0601475A (pt) 2006-12-26
DK1726606T3 (da) 2008-06-23
CA2545037A1 (en) 2006-10-30
DE502006000420D1 (de) 2008-04-17
KR101277434B1 (ko) 2013-06-25
ATE388180T1 (de) 2008-03-15
SI1726606T1 (sl) 2008-08-31
JP2006307224A (ja) 2006-11-09
CN1880393A (zh) 2006-12-20
DE102005020269A1 (de) 2006-11-09
EP1726606A1 (de) 2006-11-29
JP5273913B2 (ja) 2013-08-28
KR20060113530A (ko) 2006-11-02
AU2006201793A1 (en) 2006-11-16
US20060247371A1 (en) 2006-11-02
EP1726606B1 (de) 2008-03-05

Similar Documents

Publication Publication Date Title
PL1726606T3 (pl) Mieszaniny substancji błonotwórczych zawierające poliestry kwasu asparaginowego i poliizocyjaniany modyfikowane sulfonianami
IL190075A0 (en) Two-component systems for producing flexible coatings
ZA200803689B (en) Moisture-hardened polyurethane compositions containing compounds comprising aldimine
EP1704928A3 (en) Aqueous coating compositions
DK2194081T3 (da) Polyurethansammensætning, som indeholder hydroxyaldimin
BRPI0815732A2 (pt) Aldiminas compreendendo grupos hidroxila, e composições contendo aldimina
WO2008076662A3 (en) Polyurea coating comprising an amine/(meth)acrylate oligomeric reaction product
MY160132A (en) Intumescent composition
BRPI0519557A2 (pt) composto fluoroquÍmico, composiÇço de revestimento, artigo, e, mÉtodo para fabricar um composto fluoroquÍmico
WO2005003204A3 (en) Process for the preparation of stable polycarbodiimide dispersions in water, which are free of organic solvents and may be used as crosslinking agent
WO2005108441A3 (en) Polymer having a sulfonic group or a sulfonate group and an amide group and method of producing same
DE502008002405D1 (hr)
WO2009025151A1 (ja) 新規なアミド基含有シロキサンアミン化合物
WO2008088051A1 (ja) ホスホリルコリン基含有化合物、ホスホリルコリン基含有化合物の製造方法、表面改質剤、及び表面改質剤を用いた表面改質方法
NO20080080L (no) Organiske forbindelser
EP1671990A3 (en) Aqueous coating compositions
WO2006103101A3 (en) MEANS FOR THE INHIBITION OF ANTI-β1-ADRENERGIC RECEPTOR ANTIBODIES
WO2008030437A3 (en) Aqueous compositions of sagging control agents
WO2007017632A3 (en) Trisazo dyestuffs with 6-pyrazolyl-1-naphtholsulphomic acid as middle component
ATE425204T1 (de) Verfahren zur modifizierung eines makromolekularen systems
TW200604235A (en) Coating compositions for ambient cure containing an alkoxylated amine
WO2005093102A3 (en) Array print buffers
EP1798218A4 (en) MONOMER COMPOUND, PROCESS FOR THE PRODUCTION THEREOF, POLYMER THEREOF AND WATERBASE HARDENABLE COMPOSITION
AU2002237742A1 (en) Concentrate suitable for the preparation of cathodic electrodeposition coating compositions
WO2002061074A1 (fr) Nouvelle proteine et adn la comprenant