KR102310785B1 - 보안잉크용 경자성입자 및 이를 포함하는 잉크 조성물 - Google Patents
보안잉크용 경자성입자 및 이를 포함하는 잉크 조성물 Download PDFInfo
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- KR102310785B1 KR102310785B1 KR1020150130412A KR20150130412A KR102310785B1 KR 102310785 B1 KR102310785 B1 KR 102310785B1 KR 1020150130412 A KR1020150130412 A KR 1020150130412A KR 20150130412 A KR20150130412 A KR 20150130412A KR 102310785 B1 KR102310785 B1 KR 102310785B1
- Authority
- KR
- South Korea
- Prior art keywords
- magnetic particles
- hard magnetic
- security ink
- core
- resin
- Prior art date
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- 239000006249 magnetic particle Substances 0.000 title claims abstract description 137
- 239000000203 mixture Substances 0.000 title claims description 37
- 239000002245 particle Substances 0.000 claims abstract description 42
- 238000009826 distribution Methods 0.000 claims abstract description 14
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- 239000000049 pigment Substances 0.000 claims description 129
- 229920005989 resin Polymers 0.000 claims description 59
- 239000011347 resin Substances 0.000 claims description 59
- 238000000034 method Methods 0.000 claims description 32
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- -1 polyethylene Polymers 0.000 claims description 21
- 229910052751 metal Inorganic materials 0.000 claims description 20
- 239000002184 metal Substances 0.000 claims description 20
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- 239000002243 precursor Substances 0.000 claims description 20
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- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 10
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 10
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 10
- 229910052709 silver Inorganic materials 0.000 claims description 10
- 239000004332 silver Substances 0.000 claims description 10
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- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 8
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- ZGHFDIIVVIFNPS-UHFFFAOYSA-N 3-Methyl-3-buten-2-one Chemical compound CC(=C)C(C)=O ZGHFDIIVVIFNPS-UHFFFAOYSA-N 0.000 claims description 6
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- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 6
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Natural products C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 6
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- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 5
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 5
- 239000005083 Zinc sulfide Substances 0.000 claims description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 5
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 5
- 229910052804 chromium Inorganic materials 0.000 claims description 5
- 239000011651 chromium Substances 0.000 claims description 5
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 5
- 229910052737 gold Inorganic materials 0.000 claims description 5
- 239000010931 gold Substances 0.000 claims description 5
- ORUIBWPALBXDOA-UHFFFAOYSA-L magnesium fluoride Chemical compound [F-].[F-].[Mg+2] ORUIBWPALBXDOA-UHFFFAOYSA-L 0.000 claims description 5
- 229910001635 magnesium fluoride Inorganic materials 0.000 claims description 5
- 229910052759 nickel Inorganic materials 0.000 claims description 5
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims description 5
- 229910052697 platinum Inorganic materials 0.000 claims description 5
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- 239000011787 zinc oxide Substances 0.000 claims description 5
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- DRDVZXDWVBGGMH-UHFFFAOYSA-N zinc;sulfide Chemical compound [S-2].[Zn+2] DRDVZXDWVBGGMH-UHFFFAOYSA-N 0.000 claims description 5
- 229910001928 zirconium oxide Inorganic materials 0.000 claims description 5
- OEPOKWHJYJXUGD-UHFFFAOYSA-N 2-(3-phenylmethoxyphenyl)-1,3-thiazole-4-carbaldehyde Chemical compound O=CC1=CSC(C=2C=C(OCC=3C=CC=CC=3)C=CC=2)=N1 OEPOKWHJYJXUGD-UHFFFAOYSA-N 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- JIGUQPWFLRLWPJ-UHFFFAOYSA-N Ethyl acrylate Chemical compound CCOC(=O)C=C JIGUQPWFLRLWPJ-UHFFFAOYSA-N 0.000 claims description 4
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 claims description 4
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- 239000000956 alloy Substances 0.000 claims description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 claims description 4
- 229920002401 polyacrylamide Polymers 0.000 claims description 4
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- 239000004814 polyurethane Substances 0.000 claims description 4
- 229910052723 transition metal Inorganic materials 0.000 claims description 4
- 150000003624 transition metals Chemical class 0.000 claims description 4
- 150000003673 urethanes Chemical class 0.000 claims description 4
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 4
- JKNCOURZONDCGV-UHFFFAOYSA-N 2-(dimethylamino)ethyl 2-methylprop-2-enoate Chemical compound CN(C)CCOC(=O)C(C)=C JKNCOURZONDCGV-UHFFFAOYSA-N 0.000 claims description 3
- GOXQRTZXKQZDDN-UHFFFAOYSA-N 2-Ethylhexyl acrylate Chemical compound CCCCC(CC)COC(=O)C=C GOXQRTZXKQZDDN-UHFFFAOYSA-N 0.000 claims description 3
- WDQMWEYDKDCEHT-UHFFFAOYSA-N 2-ethylhexyl 2-methylprop-2-enoate Chemical compound CCCCC(CC)COC(=O)C(C)=C WDQMWEYDKDCEHT-UHFFFAOYSA-N 0.000 claims description 3
- KGIGUEBEKRSTEW-UHFFFAOYSA-N 2-vinylpyridine Chemical compound C=CC1=CC=CC=N1 KGIGUEBEKRSTEW-UHFFFAOYSA-N 0.000 claims description 3
- KFDVPJUYSDEJTH-UHFFFAOYSA-N 4-ethenylpyridine Chemical compound C=CC1=CC=NC=C1 KFDVPJUYSDEJTH-UHFFFAOYSA-N 0.000 claims description 3
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 3
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 claims description 3
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims description 3
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- 230000002378 acidificating effect Effects 0.000 claims description 3
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- 229910000428 cobalt oxide Inorganic materials 0.000 claims description 3
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- 125000004185 ester group Chemical group 0.000 claims description 3
- UIWXSTHGICQLQT-UHFFFAOYSA-N ethenyl propanoate Chemical compound CCC(=O)OC=C UIWXSTHGICQLQT-UHFFFAOYSA-N 0.000 claims description 3
- 125000005313 fatty acid group Chemical group 0.000 claims description 3
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- 238000013007 heat curing Methods 0.000 claims description 3
- PBZROIMXDZTJDF-UHFFFAOYSA-N hepta-1,6-dien-4-one Chemical compound C=CCC(=O)CC=C PBZROIMXDZTJDF-UHFFFAOYSA-N 0.000 claims description 3
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- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 claims description 3
- HJWLCRVIBGQPNF-UHFFFAOYSA-N prop-2-enylbenzene Chemical compound C=CCC1=CC=CC=C1 HJWLCRVIBGQPNF-UHFFFAOYSA-N 0.000 claims description 3
- NHARPDSAXCBDDR-UHFFFAOYSA-N propyl 2-methylprop-2-enoate Chemical compound CCCOC(=O)C(C)=C NHARPDSAXCBDDR-UHFFFAOYSA-N 0.000 claims description 3
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- 125000003011 styrenyl group Chemical group [H]\C(*)=C(/[H])C1=C([H])C([H])=C([H])C([H])=C1[H] 0.000 claims description 3
- FUSUHKVFWTUUBE-UHFFFAOYSA-N vinyl methyl ketone Natural products CC(=O)C=C FUSUHKVFWTUUBE-UHFFFAOYSA-N 0.000 claims description 3
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- 239000012153 distilled water Substances 0.000 description 7
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- XCJYREBRNVKWGJ-UHFFFAOYSA-N copper(II) phthalocyanine Chemical compound [Cu+2].C12=CC=CC=C2C(N=C2[N-]C(C3=CC=CC=C32)=N2)=NC1=NC([C]1C=CC=CC1=1)=NC=1N=C1[C]3C=CC=CC3=C2[N-]1 XCJYREBRNVKWGJ-UHFFFAOYSA-N 0.000 description 5
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- FVQMJJQUGGVLEP-UHFFFAOYSA-N (2-methylpropan-2-yl)oxy 2-ethylhexaneperoxoate Chemical compound CCCCC(CC)C(=O)OOOC(C)(C)C FVQMJJQUGGVLEP-UHFFFAOYSA-N 0.000 description 2
- YVLJEXBGMVDKBR-UHFFFAOYSA-N 1,10-dichloro-7-methyldec-1-ene Chemical compound ClCCCC(C)CCCCC=CCl YVLJEXBGMVDKBR-UHFFFAOYSA-N 0.000 description 2
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- WYGWHHGCAGTUCH-UHFFFAOYSA-N 2-[(2-cyano-4-methylpentan-2-yl)diazenyl]-2,4-dimethylpentanenitrile Chemical compound CC(C)CC(C)(C#N)N=NC(C)(C#N)CC(C)C WYGWHHGCAGTUCH-UHFFFAOYSA-N 0.000 description 2
- 239000004342 Benzoyl peroxide Substances 0.000 description 2
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical compound C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 description 2
- 239000004606 Fillers/Extenders Substances 0.000 description 2
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- KYIKRXIYLAGAKQ-UHFFFAOYSA-N abcn Chemical compound C1CCCCC1(C#N)N=NC1(C#N)CCCCC1 KYIKRXIYLAGAKQ-UHFFFAOYSA-N 0.000 description 2
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- LSXWFXONGKSEMY-UHFFFAOYSA-N di-tert-butyl peroxide Chemical compound CC(C)(C)OOC(C)(C)C LSXWFXONGKSEMY-UHFFFAOYSA-N 0.000 description 2
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- SUPCQIBBMFXVTL-UHFFFAOYSA-N ethyl 2-methylprop-2-enoate Chemical compound CCOC(=O)C(C)=C SUPCQIBBMFXVTL-UHFFFAOYSA-N 0.000 description 2
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- ZQMHJBXHRFJKOT-UHFFFAOYSA-N methyl 2-[(1-methoxy-2-methyl-1-oxopropan-2-yl)diazenyl]-2-methylpropanoate Chemical compound COC(=O)C(C)(C)N=NC(C)(C)C(=O)OC ZQMHJBXHRFJKOT-UHFFFAOYSA-N 0.000 description 2
- DYGOPFFOGFHOIB-UHFFFAOYSA-N methylperoxyethane Chemical compound CCOOC DYGOPFFOGFHOIB-UHFFFAOYSA-N 0.000 description 2
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- 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
- C09D11/00—Inks
- C09D11/02—Printing inks
- C09D11/03—Printing inks characterised by features other than the chemical nature of the binder
- C09D11/037—Printing inks characterised by features other than the chemical nature of the binder characterised by the pigment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
- B41M3/14—Security printing
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- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Power Engineering (AREA)
- Inks, Pencil-Leads, Or Crayons (AREA)
Abstract
[관계식 1]
1 μm ≤ D50 ≤ 8 μm
(관계식 1에서, D50은 상기 코어의 입경 누적분포에서 50%에 해당하는 입자크기이다)
[관계식 2]
15 kA/m ≤ Hc ≤ 45 kA/m
(관계식 2에서, Hc는 상기 코어의 보자력이다)
Description
도 2는 본 발명의 실시예 1에 따른 보안잉크용 경자성입자의 SEM 사진이다.
도 3은 본 발명의 실시예 1에 따른 보안잉크용 경자성입자의 제조방법을 도시한 개략도이다.
200: 무기쉘
Claims (22)
- 자성체 입자들이 수지 또는 금속산화물 전구체에 의해 응집되어 이루어진 코어; 및
상기 코어의 적어도 일부 표면을 덮는 무기쉘;을 포함하며,
상기 코어는 하기 관계식 1 및 관계식 2를 만족하는 것을 특징으로 하는 보안잉크용 경자성입자.
[관계식 1]
1 μm ≤ D50 ≤ 8 μm
(관계식 1에서, D50은 상기 코어의 입경 누적분포에서 50%에 해당하는 입자크기이다)
[관계식 2]
15 kA/m ≤ Hc ≤ 45 kA/m
(관계식 2에서, Hc는 상기 코어의 보자력이다)
- 삭제
- 제 1항에 있어서,
상기 코어의 탭 밀도(Tap density)는 1.2 내지 3 g/cm3 인 것을 특징으로 하는 보안잉크용 경자성입자.
- 제 1항에 있어서,
상기 수지는 UV 경화성 수지 또는 열경화성 수지인 것을 특징으로 하는 보안잉크용 경자성입자.
- 제 4항에 있어서,
상기 수지는 폴리에스테르아크릴레이트, 폴리우레탄아크릴레이트, 폴리에틸렌글리콜-아크릴레이트, 폴리에틸렌글리콜-개질우레탄, 폴리에틸렌글리콜-개질폴리에스테르, 폴리아크릴아마이드, 폴리스티렌부다디엔, 및 폴리스티렌부틸아크릴레이트에서 적어도 하나 이상 선택되는 보안잉크용 경자성입자.
- 제 5항에 있어서,
상기 수지의 팽윤도는 하기 관계식 3을 만족하는 보안잉크용 경자성입자.
[관계식 3]
0.001 ≤ (Ws - Wd)/Wd ≤ 0.03
(Ws 는 1 g의 수지를 극성 용매 100 g에 용해한 후 70℃에서 24시간 방치 후 측정한 팽윤된(swelling) 시료의 무게이고, Wd는 팽윤되기 전의 건조된 시료의 무게를 의미한다)
- 제 1항에 있어서,
상기 자성체 입자는
알루미늄(Al) 및 전이금속에서 적어도 둘 이상을 포함하는 합금; 및
산화철, 산화니켈, 및 산화코발트에서 적어도 하나 이상을 포함하는 산화물;으로 이루어지는 군에서 적어도 1종 이상인 것을 특징으로 하는 보안잉크용 경자성입자.
- 제 1항에 있어서,
상기 자성체 입자의 평균입경은 10 nm 내지 5 μm 인 보안잉크용 경자성입자.
- 제 1항에 있어서,
상기 자성체 입자는 하기 관계식 4를 만족하는 것인 보안잉크용 경자성입자.
[관계식 4]
0.1 ≤ V1/V2 ≤ 9
(관계식 4에서, V1은 자성체 입자의 바이모달(Bimodal) 입도분포 중 작은 입도(0.02 ~ 0.5 μm)를 나타내는 피크(Peak)의 부피%이고, V2는 자성체 입자의 바이모달(Bimodal) 입도분포 중 큰 입도(0.5 ~ 2 μm)를 나타내는 피크(Peak)의 부피%이다)
- 제 1항에 있어서,
상기 무기쉘은 유전체 물질 및 금속에서 적어도 하나 이상을 포함하는 보안잉크용 경자성입자.
- 제 10항에 있어서,
상기 유전체 물질은 이산화티탄, 이산화규소, 알루미나, 탄산칼슘, 산화지르코늄, 불화마그네슘, 산화아연 및 황화아연으로 이루어진 군으로부터 하나 이상 선택된 것이고,
상기 금속은 구리, 니켈, 금, 백금, 은, 알루미늄 및 크롬에서 하나 이상 선택된 것인 보안잉크용 경자성입자.
- 제 1항에 있어서,
상기 무기쉘은 단층 또는 다층으로 형성되는 것인 보안잉크용 경자성입자.
- 1)평균입경이 10 nm 내지 5 μm인 자성체 입자를 수지와 혼합하여 에멀션(emulsion)을 제조하는 단계;
2)상기 제조된 에멀션을 UV 경화 또는 열경화하여 코어를 제조하는 단계; 및
3)상기 제조된 코어에 금속 전구체 및 금속산화물 전구체에서 적어도 하나 이상을 포함하는 페이스트 또는 용액을 도포한 후, 이를 건조하여 상기 코어 외곽에 배치된 무기쉘을 형성하는 단계를 포함하며,
상기 코어는 하기 관계식 1 및 관계식 2를 만족하는 것인 보안잉크용 경자성입자의 제조방법.
[관계식 1]
1 μm ≤ D50 ≤ 8 μm
(관계식 1에서, D50은 상기 코어의 입경 누적분포에서 50%에 해당하는 입자크기이다)
[관계식 2]
15 kA/m ≤ Hc ≤ 45 kA/m
(관계식 2에서, Hc는 상기 코어의 보자력이다)
- 제 13항에 있어서,
상기 1)단계의 수지는 폴리에스테르아크릴레이트, 폴리우레탄아크릴레이트, 폴리에틸렌글리콜-아크릴레이트, 폴리에틸렌글리콜-개질우레탄, 폴리에틸렌글리콜-개질폴리에스테르, 폴리아크릴아마이드, 폴리스티렌부다디엔, 및 폴리스티렌부틸아크릴레이트에서 적어도 하나 이상 선택되는 보안잉크용 경자성입자의 제조방법.
- 제 14항에 있어서,
상기 수지의 팽윤도는 하기 관계식 3을 만족하는 보안잉크용 경자성입자의 제조방법.
[관계식 3]
0.001 ≤ (Ws - Wd)/Wd ≤ 0.03
(Ws 는 1 g의 수지를 극성 용매 100 g에 용해한 후 70℃에서 24시간 방치 후 측정한 팽윤된(swelling) 시료의 무게이고, Wd는 팽윤되기 전의 건조된 시료의 무게를 의미한다)
- 제 15항에 있어서,
상기 수지는 비닐계 단량체, 산성기 함유 극성 단량체, 불포화 에스테르기 함유 단량체 및 지방산기 함유 단량체;에서 적어도 하나이상 선택되는 중합성 단량체를 포함하는 보안잉크용 경자성입자의 제조방법.
- 제 16항에 있어서,
상기 중합성 단량체는 스티렌, 비닐톨루엔, α-메틸스티렌, 아크릴산, 메타크릴산, 아크릴산메틸, 아크릴산에틸, 아크릴산프로필, 아크릴산부틸, 아크릴산 2-에틸헥실, 아크릴산디메틸아미노에틸, 메타크릴산메틸, 메타크릴산에틸, 메타크릴산프로필, 메타크릴산부틸, 메타크릴산 2-에틸헥실, 메타크릴산디메틸아미노에틸, 아크릴로니트릴, 메타크릴로니트릴, 아크릴아미드, 메타크릴아미드, 에틸렌, 프로필렌, 부틸렌, 염화비닐, 염화비닐리덴, 불화비닐, 아세트산비닐, 프로피온산비닐, 비닐메틸에테르, 비닐에틸에테르, 비닐메틸케톤, 메틸이소프로페닐케톤, 2-비닐피리딘, 4-비닐피리딘, 및 N-비닐피롤리돈 중에서 적어도 하나 이상 선택되는 보안잉크용 경자성입자의 제조방법.
- 제 1항 및 제 3항 내지 제 12항 중 어느 한 항에 따른 경자성입자; 및
바니시, 안료, 계면활성제, 왁스, 및 용제;를 포함하는 보안용 잉크 조성물.
- 제 18항에 있어서,
상기 보안용잉크는
5 내지 15 wt% 경자성입자, 20 내지 40 wt% 바니시, 30 내지 50 wt% 안료, 5 내지 10 wt% 계면활성제, 1 내지 10 wt% 왁스 및 2 내지 10 wt% 용제를 포함하는 보안용 잉크 조성물.
- 제 18항에 있어서,
상기 경자성입자의 흡유도는 10 내지 50 인 것을 특징으로 하는 보안용 잉크 조성물.
- 제 1항 및 제 3항 내지 제 12항 중 어느 한 항에 따른 경자성입자를 포함하는 제1보안용잉크 조성물; 및
상기 경자성입자의 보자력 크기보다 작은 자성입자를 포함하는 제2보안용잉크 조성물;를 포함하는 보안용 유가증서.
- 제 21항에 있어서,
상기 제1보안용잉크 조성물 및 상기 제2보안용잉크 조성물은 하기 관계식 5를 만족하는 것을 특징으로 하는 보안용 유가증서.
[관계식 5]
1.5 ≤ q ≤ 45, q=q1/q2
(q1는 제1보안용잉크 조성물의 보자력이며, q2는 제2보안용잉크 조성물의 보자력이다)
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