JPS6344795B2 - - Google Patents

Info

Publication number: JPS6344795B2
Authority: JP; Japan
Prior art keywords: water; muddy water; acid; present; copolymer
Prior art date: 1981-12-18
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.): Expired

Application number

JP20366681A

Other languages

English (en)

Japanese (ja)

Other versions

JPS58104981A (ja

Inventor

Masao Hoshino

Katsuhisa Abe

Juji Kawamura

Shizuro Kimata

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.)

Toagosei Co Ltd

Original Assignee

Toagosei Co Ltd

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.)

1981-12-18

Filing date

1981-12-18

Publication date

1988-09-06

1981-12-18 Application filed by Toagosei Co Ltd filed Critical Toagosei Co Ltd

1981-12-18 Priority to JP20366681A priority Critical patent/JPS58104981A/ja

1983-06-22 Publication of JPS58104981A publication Critical patent/JPS58104981A/ja

1988-09-06 Publication of JPS6344795B2 publication Critical patent/JPS6344795B2/ja

Status Granted legal-status Critical Current

Links

239000000178 monomer Substances 0.000 claims description 22
229920001577 copolymer Polymers 0.000 claims description 21
239000004034 viscosity adjusting agent Substances 0.000 claims description 15
238000005553 drilling Methods 0.000 claims description 12
150000003839 salts Chemical class 0.000 claims description 11
238000006116 polymerization reaction Methods 0.000 claims description 9
150000001732 carboxylic acid derivatives Chemical class 0.000 claims description 8
NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 7
125000000020 sulfo group Chemical group O=S(=O)([*])O[H] 0.000 claims description 6
125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 6
229920002554 vinyl polymer Polymers 0.000 claims description 6
150000002825 nitriles Chemical class 0.000 claims description 5
239000000470 constituent Substances 0.000 claims description 2
125000005395 methacrylic acid group Chemical group 0.000 claims description 2
XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 35
230000000694 effects Effects 0.000 description 9
-1 or mixed systems) Substances 0.000 description 9
239000000440 bentonite Substances 0.000 description 7
229910000278 bentonite Inorganic materials 0.000 description 7
SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 7
229910052783 alkali metal Inorganic materials 0.000 description 6
239000000203 mixture Substances 0.000 description 6
SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 5
150000001735 carboxylic acids Chemical class 0.000 description 5
239000002270 dispersing agent Substances 0.000 description 5
HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Inorganic materials [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 5
239000004568 cement Substances 0.000 description 4
230000000052 comparative effect Effects 0.000 description 4
150000002500 ions Chemical class 0.000 description 4
229910052751 metal Inorganic materials 0.000 description 4
239000002184 metal Substances 0.000 description 4
238000000034 method Methods 0.000 description 4
239000000725 suspension Substances 0.000 description 4
CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 3
WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 3
239000000654 additive Substances 0.000 description 3
150000001339 alkali metal compounds Chemical class 0.000 description 3
125000005907 alkyl ester group Chemical group 0.000 description 3
239000010425 asbestos Substances 0.000 description 3
230000015572 biosynthetic process Effects 0.000 description 3
239000000356 contaminant Substances 0.000 description 3
230000007423 decrease Effects 0.000 description 3
239000006185 dispersion Substances 0.000 description 3
238000005755 formation reaction Methods 0.000 description 3
239000010440 gypsum Substances 0.000 description 3
229910052602 gypsum Inorganic materials 0.000 description 3
239000003129 oil well Substances 0.000 description 3
229910052895 riebeckite Inorganic materials 0.000 description 3
239000013535 sea water Substances 0.000 description 3
OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 description 2
OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 description 2
BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 description 2
NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
239000004113 Sepiolite Substances 0.000 description 2
FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
239000002253 acid Substances 0.000 description 2
230000000996 additive effect Effects 0.000 description 2
239000003513 alkali Substances 0.000 description 2
239000007864 aqueous solution Substances 0.000 description 2
238000009412 basement excavation Methods 0.000 description 2
239000011575 calcium Substances 0.000 description 2
239000003795 chemical substances by application Substances 0.000 description 2
230000015271 coagulation Effects 0.000 description 2
238000005345 coagulation Methods 0.000 description 2
238000011109 contamination Methods 0.000 description 2
239000012530 fluid Substances 0.000 description 2
238000005187 foaming Methods 0.000 description 2
239000007788 liquid Substances 0.000 description 2
230000014759 maintenance of location Effects 0.000 description 2
229910021645 metal ion Inorganic materials 0.000 description 2
125000005397 methacrylic acid ester group Chemical group 0.000 description 2
239000003607 modifier Substances 0.000 description 2
229920000058 polyacrylate Polymers 0.000 description 2
229920000642 polymer Polymers 0.000 description 2
230000002265 prevention Effects 0.000 description 2
229910052624 sepiolite Inorganic materials 0.000 description 2
235000019355 sepiolite Nutrition 0.000 description 2
239000000243 solution Substances 0.000 description 2
238000013112 stability test Methods 0.000 description 2
230000000087 stabilizing effect Effects 0.000 description 2
230000008719 thickening Effects 0.000 description 2
239000002562 thickening agent Substances 0.000 description 2
VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 2
239000002699 waste material Substances 0.000 description 2
229920002818 (Hydroxyethyl)methacrylate Polymers 0.000 description 1
JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 description 1
JKNCOURZONDCGV-UHFFFAOYSA-N 2-(dimethylamino)ethyl 2-methylprop-2-enoate Chemical compound CN(C)CCOC(=O)C(C)=C JKNCOURZONDCGV-UHFFFAOYSA-N 0.000 description 1
229920000536 2-Acrylamido-2-methylpropane sulfonic acid Polymers 0.000 description 1
XHZPRMZZQOIPDS-UHFFFAOYSA-N 2-Methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid Chemical compound OS(=O)(=O)CC(C)(C)NC(=O)C=C XHZPRMZZQOIPDS-UHFFFAOYSA-N 0.000 description 1
SFPNZPQIIAJXGL-UHFFFAOYSA-N 2-ethoxyethyl 2-methylprop-2-enoate Chemical compound CCOCCOC(=O)C(C)=C SFPNZPQIIAJXGL-UHFFFAOYSA-N 0.000 description 1
WDQMWEYDKDCEHT-UHFFFAOYSA-N 2-ethylhexyl 2-methylprop-2-enoate Chemical compound CCCCC(CC)COC(=O)C(C)=C WDQMWEYDKDCEHT-UHFFFAOYSA-N 0.000 description 1
OMIGHNLMNHATMP-UHFFFAOYSA-N 2-hydroxyethyl prop-2-enoate Chemical compound OCCOC(=O)C=C OMIGHNLMNHATMP-UHFFFAOYSA-N 0.000 description 1
HFCUBKYHMMPGBY-UHFFFAOYSA-N 2-methoxyethyl prop-2-enoate Chemical compound COCCOC(=O)C=C HFCUBKYHMMPGBY-UHFFFAOYSA-N 0.000 description 1
XEEYSDHEOQHCDA-UHFFFAOYSA-N 2-methylprop-2-ene-1-sulfonic acid Chemical compound CC(=C)CS(O)(=O)=O XEEYSDHEOQHCDA-UHFFFAOYSA-N 0.000 description 1
AGBXYHCHUYARJY-UHFFFAOYSA-N 2-phenylethenesulfonic acid Chemical compound OS(=O)(=O)C=CC1=CC=CC=C1 AGBXYHCHUYARJY-UHFFFAOYSA-N 0.000 description 1
QZPSOSOOLFHYRR-UHFFFAOYSA-N 3-hydroxypropyl prop-2-enoate Chemical compound OCCCOC(=O)C=C QZPSOSOOLFHYRR-UHFFFAOYSA-N 0.000 description 1
QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical compound C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 description 1
QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Natural products CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 1
NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 1
VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
JIGUQPWFLRLWPJ-UHFFFAOYSA-N Ethyl acrylate Chemical compound CCOC(=O)C=C JIGUQPWFLRLWPJ-UHFFFAOYSA-N 0.000 description 1
206010016807 Fluid retention Diseases 0.000 description 1
WOBHKFSMXKNTIM-UHFFFAOYSA-N Hydroxyethyl methacrylate Chemical compound CC(=C)C(=O)OCCO WOBHKFSMXKNTIM-UHFFFAOYSA-N 0.000 description 1
DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 1
GYCMBHHDWRMZGG-UHFFFAOYSA-N Methylacrylonitrile Chemical compound CC(=C)C#N GYCMBHHDWRMZGG-UHFFFAOYSA-N 0.000 description 1
ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
229960000583 acetic acid Drugs 0.000 description 1
125000005396 acrylic acid ester group Chemical group 0.000 description 1
239000008186 active pharmaceutical agent Substances 0.000 description 1
239000005456 alcohol based solvent Substances 0.000 description 1
150000001340 alkali metals Chemical class 0.000 description 1
XYLMUPLGERFSHI-UHFFFAOYSA-N alpha-Methylstyrene Chemical compound CC(=C)C1=CC=CC=C1 XYLMUPLGERFSHI-UHFFFAOYSA-N 0.000 description 1
229910000147 aluminium phosphate Inorganic materials 0.000 description 1
150000003863 ammonium salts Chemical class 0.000 description 1
CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 description 1
125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
229910052791 calcium Inorganic materials 0.000 description 1
229910001424 calcium ion Inorganic materials 0.000 description 1
238000006243 chemical reaction Methods 0.000 description 1
ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 1
229910052804 chromium Inorganic materials 0.000 description 1
239000011651 chromium Substances 0.000 description 1
239000004927 clay Substances 0.000 description 1
239000002131 composite material Substances 0.000 description 1
150000001875 compounds Chemical class 0.000 description 1
238000007334 copolymerization reaction Methods 0.000 description 1
230000018044 dehydration Effects 0.000 description 1
238000006297 dehydration reaction Methods 0.000 description 1
150000002148 esters Chemical class 0.000 description 1
DTFWHZMCNUZRBU-UHFFFAOYSA-N ethanesulfonic acid;2-methylprop-2-enoic acid Chemical compound CCS(O)(=O)=O.CC(=C)C(O)=O DTFWHZMCNUZRBU-UHFFFAOYSA-N 0.000 description 1
AFSIMBWBBOJPJG-UHFFFAOYSA-N ethenyl octadecanoate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OC=C AFSIMBWBBOJPJG-UHFFFAOYSA-N 0.000 description 1
SUPCQIBBMFXVTL-UHFFFAOYSA-N ethyl 2-methylprop-2-enoate Chemical compound CCOC(=O)C(C)=C SUPCQIBBMFXVTL-UHFFFAOYSA-N 0.000 description 1
125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
230000002349 favourable effect Effects 0.000 description 1
239000013505 freshwater Substances 0.000 description 1
239000001530 fumaric acid Substances 0.000 description 1
238000001879 gelation Methods 0.000 description 1
239000004021 humic acid Substances 0.000 description 1
230000036571 hydration Effects 0.000 description 1
238000006703 hydration reaction Methods 0.000 description 1
PBOSTUDLECTMNL-UHFFFAOYSA-N lauryl acrylate Chemical compound CCCCCCCCCCCCOC(=O)C=C PBOSTUDLECTMNL-UHFFFAOYSA-N 0.000 description 1
229920005610 lignin Polymers 0.000 description 1
229910052744 lithium Inorganic materials 0.000 description 1
239000010687 lubricating oil Substances 0.000 description 1
239000011777 magnesium Substances 0.000 description 1
229910052749 magnesium Inorganic materials 0.000 description 1
229910001425 magnesium ion Inorganic materials 0.000 description 1
VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
239000011976 maleic acid Substances 0.000 description 1
238000004519 manufacturing process Methods 0.000 description 1
239000000463 material Substances 0.000 description 1
150000002739 metals Chemical class 0.000 description 1
125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 1
239000002480 mineral oil Substances 0.000 description 1
235000010446 mineral oil Nutrition 0.000 description 1
239000002343 natural gas well Substances 0.000 description 1
230000003472 neutralizing effect Effects 0.000 description 1
239000003921 oil Substances 0.000 description 1
PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 description 1
JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 description 1
229920001495 poly(sodium acrylate) polymer Polymers 0.000 description 1
239000003505 polymerization initiator Substances 0.000 description 1
230000000379 polymerizing effect Effects 0.000 description 1
229910052700 potassium Inorganic materials 0.000 description 1
239000011591 potassium Substances 0.000 description 1
239000001103 potassium chloride Substances 0.000 description 1
235000011164 potassium chloride Nutrition 0.000 description 1
239000000843 powder Substances 0.000 description 1
UIIIBRHUICCMAI-UHFFFAOYSA-N prop-2-ene-1-sulfonic acid Chemical compound OS(=O)(=O)CC=C UIIIBRHUICCMAI-UHFFFAOYSA-N 0.000 description 1
HJWLCRVIBGQPNF-UHFFFAOYSA-N prop-2-enylbenzene Chemical compound C=CCC1=CC=CC=C1 HJWLCRVIBGQPNF-UHFFFAOYSA-N 0.000 description 1
125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
PNXMTCDJUBJHQJ-UHFFFAOYSA-N propyl prop-2-enoate Chemical compound CCCOC(=O)C=C PNXMTCDJUBJHQJ-UHFFFAOYSA-N 0.000 description 1
230000000630 rising effect Effects 0.000 description 1
238000004904 shortening Methods 0.000 description 1
229910052708 sodium Inorganic materials 0.000 description 1
239000011734 sodium Substances 0.000 description 1
239000011780 sodium chloride Substances 0.000 description 1
235000011121 sodium hydroxide Nutrition 0.000 description 1
NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 1
239000002904 solvent Substances 0.000 description 1
150000003457 sulfones Chemical class 0.000 description 1
239000004094 surface-active agent Substances 0.000 description 1
230000008961 swelling Effects 0.000 description 1
229920001864 tannin Polymers 0.000 description 1
235000018553 tannin Nutrition 0.000 description 1
239000001648 tannin Substances 0.000 description 1
229920001567 vinyl ester resin Polymers 0.000 description 1
NLVXSWCKKBEXTG-UHFFFAOYSA-N vinylsulfonic acid Chemical compound OS(=O)(=O)C=C NLVXSWCKKBEXTG-UHFFFAOYSA-N 0.000 description 1

Landscapes

Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)

JP20366681A 1981-12-18 1981-12-18 掘削用泥水の粘度調整剤 Granted JPS58104981A (ja)

Priority Applications (1)

Application Number	Priority Date	Filing Date	Title
JP20366681A JPS58104981A (ja)	1981-12-18	1981-12-18	掘削用泥水の粘度調整剤

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
JP20366681A JPS58104981A (ja)	1981-12-18	1981-12-18	掘削用泥水の粘度調整剤

Publications (2)

Publication Number	Publication Date
JPS58104981A JPS58104981A (ja)	1983-06-22
JPS6344795B2 true JPS6344795B2 (fr)	1988-09-06

Family

ID=16477835

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
JP20366681A Granted JPS58104981A (ja)	1981-12-18	1981-12-18	掘削用泥水の粘度調整剤

Country Status (1)

Country	Link
JP (1)	JPS58104981A (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
JP2000282020A (ja) *	1999-03-31	2000-10-10	Terunaito:Kk	地熱井用掘削泥水組成物および掘削方法
JP2003041243A (ja) *	2001-04-27	2003-02-13	Terunaito:Kk	掘削安定液用増粘剤、それを用いた掘削安定液、並びにそれを用いた場所打ち地中杭工法及び地中連続壁工法

1981
- 1981-12-18 JP JP20366681A patent/JPS58104981A/ja active Granted

Also Published As

Publication number	Publication date
JPS58104981A (ja)	1983-06-22

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JPS6344794B2 (fr)	1988-09-06