JPH027984B2 - - Google Patents
Info
- Publication number
- JPH027984B2 JPH027984B2 JP61064294A JP6429486A JPH027984B2 JP H027984 B2 JPH027984 B2 JP H027984B2 JP 61064294 A JP61064294 A JP 61064294A JP 6429486 A JP6429486 A JP 6429486A JP H027984 B2 JPH027984 B2 JP H027984B2
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- precipitation
- ethanol
- solution
- jacket
- 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.)
- Expired - Lifetime
Links
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 53
- 238000001556 precipitation Methods 0.000 claims abstract description 51
- 239000000843 powder Substances 0.000 claims abstract description 39
- 238000000034 method Methods 0.000 claims abstract description 29
- 229920002647 polyamide Polymers 0.000 claims abstract description 29
- 239000004952 Polyamide Substances 0.000 claims abstract description 28
- 238000000576 coating method Methods 0.000 claims abstract description 20
- 238000001816 cooling Methods 0.000 claims abstract description 17
- 125000004432 carbon atom Chemical group C* 0.000 claims abstract description 11
- 125000005521 carbonamide group Chemical group 0.000 claims abstract description 11
- 239000011248 coating agent Substances 0.000 claims abstract description 11
- 230000008569 process Effects 0.000 claims abstract description 9
- 238000003756 stirring Methods 0.000 claims abstract description 9
- 238000004821 distillation Methods 0.000 claims abstract description 5
- 238000004519 manufacturing process Methods 0.000 claims abstract description 4
- 239000002245 particle Substances 0.000 claims description 20
- 125000001931 aliphatic group Chemical group 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 229920006017 homo-polyamide Polymers 0.000 claims description 5
- 239000000725 suspension Substances 0.000 claims description 5
- 238000009835 boiling Methods 0.000 claims description 4
- 238000002425 crystallisation Methods 0.000 claims description 3
- 230000008025 crystallization Effects 0.000 claims description 3
- 239000011261 inert gas Substances 0.000 claims description 2
- 230000002265 prevention Effects 0.000 claims description 2
- 238000004781 supercooling Methods 0.000 claims description 2
- 239000002904 solvent Substances 0.000 abstract description 4
- 239000002826 coolant Substances 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 19
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 10
- 238000009826 distribution Methods 0.000 description 7
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 6
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 238000007598 dipping method Methods 0.000 description 5
- 238000000227 grinding Methods 0.000 description 5
- 238000006116 polymerization reaction Methods 0.000 description 5
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 4
- 238000009503 electrostatic coating Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- BDJRBEYXGGNYIS-UHFFFAOYSA-N nonanedioic acid Chemical compound OC(=O)CCCCCCCC(O)=O BDJRBEYXGGNYIS-UHFFFAOYSA-N 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 239000012670 alkaline solution Substances 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 239000008187 granular material Substances 0.000 description 3
- 230000003301 hydrolyzing effect Effects 0.000 description 3
- 239000003381 stabilizer Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 239000001361 adipic acid Substances 0.000 description 2
- 235000011037 adipic acid Nutrition 0.000 description 2
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- TVIDDXQYHWJXFK-UHFFFAOYSA-N dodecanedioic acid Chemical compound OC(=O)CCCCCCCCCCC(O)=O TVIDDXQYHWJXFK-UHFFFAOYSA-N 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- JBKVHLHDHHXQEQ-UHFFFAOYSA-N epsilon-caprolactam Chemical compound O=C1CCCCCN1 JBKVHLHDHHXQEQ-UHFFFAOYSA-N 0.000 description 2
- NAQMVNRVTILPCV-UHFFFAOYSA-N hexane-1,6-diamine Chemical compound NCCCCCCN NAQMVNRVTILPCV-UHFFFAOYSA-N 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 150000003951 lactams Chemical class 0.000 description 2
- RLSSMJSEOOYNOY-UHFFFAOYSA-N m-cresol Chemical compound CC1=CC=CC(O)=C1 RLSSMJSEOOYNOY-UHFFFAOYSA-N 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 230000001376 precipitating effect Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- CXMXRPHRNRROMY-UHFFFAOYSA-N sebacic acid Chemical compound OC(=O)CCCCCCCCC(O)=O CXMXRPHRNRROMY-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- DNIAPMSPPWPWGF-GSVOUGTGSA-N (R)-(-)-Propylene glycol Chemical compound C[C@@H](O)CO DNIAPMSPPWPWGF-GSVOUGTGSA-N 0.000 description 1
- PWGJDPKCLMLPJW-UHFFFAOYSA-N 1,8-diaminooctane Chemical compound NCCCCCCCCN PWGJDPKCLMLPJW-UHFFFAOYSA-N 0.000 description 1
- QFGCFKJIPBRJGM-UHFFFAOYSA-N 12-[(2-methylpropan-2-yl)oxy]-12-oxododecanoic acid Chemical compound CC(C)(C)OC(=O)CCCCCCCCCCC(O)=O QFGCFKJIPBRJGM-UHFFFAOYSA-N 0.000 description 1
- HASUJDLTAYUWCO-UHFFFAOYSA-N 2-aminoundecanoic acid Chemical compound CCCCCCCCCC(N)C(O)=O HASUJDLTAYUWCO-UHFFFAOYSA-N 0.000 description 1
- JZUHIOJYCPIVLQ-UHFFFAOYSA-N 2-methylpentane-1,5-diamine Chemical compound NCC(C)CCCN JZUHIOJYCPIVLQ-UHFFFAOYSA-N 0.000 description 1
- WPMYUUITDBHVQZ-UHFFFAOYSA-N 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoic acid Chemical compound CC(C)(C)C1=CC(CCC(O)=O)=CC(C(C)(C)C)=C1O WPMYUUITDBHVQZ-UHFFFAOYSA-N 0.000 description 1
- RNLHGQLZWXBQNY-UHFFFAOYSA-N 3-(aminomethyl)-3,5,5-trimethylcyclohexan-1-amine Chemical compound CC1(C)CC(N)CC(C)(CN)C1 RNLHGQLZWXBQNY-UHFFFAOYSA-N 0.000 description 1
- 239000005711 Benzoic acid Substances 0.000 description 1
- JHWNWJKBPDFINM-UHFFFAOYSA-N Laurolactam Chemical compound O=C1CCCCCCCCCCCN1 JHWNWJKBPDFINM-UHFFFAOYSA-N 0.000 description 1
- 229920000299 Nylon 12 Polymers 0.000 description 1
- 235000011054 acetic acid Nutrition 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 125000004183 alkoxy alkyl group Chemical group 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 125000005037 alkyl phenyl group Chemical group 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 229920003180 amino resin Polymers 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 235000010233 benzoic acid Nutrition 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000003398 denaturant Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- QFTYSVGGYOXFRQ-UHFFFAOYSA-N dodecane-1,12-diamine Chemical compound NCCCCCCCCCCCCN QFTYSVGGYOXFRQ-UHFFFAOYSA-N 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007610 electrostatic coating method Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- -1 for example Substances 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 235000013980 iron oxide Nutrition 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- ZETYUTMSJWMKNQ-UHFFFAOYSA-N n,n',n'-trimethylhexane-1,6-diamine Chemical compound CNCCCCCCN(C)C ZETYUTMSJWMKNQ-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920006254 polymer film Polymers 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 238000007751 thermal spraying Methods 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/12—Powdering or granulating
- C08J3/14—Powdering or granulating by precipitation from solutions
-
- 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
- C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
- C08G69/46—Post-polymerisation treatment
-
- 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
- C09D177/00—Coating compositions based on polyamides obtained by reactions forming a carboxylic amide link in the main chain; Coating compositions based on derivatives of such polymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2377/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Polyamides (AREA)
- Paints Or Removers (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3510691.3 | 1985-03-23 | ||
| DE19853510691 DE3510691A1 (de) | 1985-03-23 | 1985-03-23 | Verfahren zur herstellung von pulverfoermigen beschichtungsmitteln auf der basis von polyamiden mit mindestens 10 aliphatisch gebundenen kohlenstoffatomen pro carbonamidgruppe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61221273A JPS61221273A (ja) | 1986-10-01 |
| JPH027984B2 true JPH027984B2 (enExample) | 1990-02-21 |
Family
ID=6266209
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61064294A Granted JPS61221273A (ja) | 1985-03-23 | 1986-03-24 | カルボンアミド基１個あたり少なくとも１０個の脂肪族の結合炭素原子を有するポリアミドを基礎とする粉末状被覆剤の製造法 |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US4687838A (enExample) |
| EP (1) | EP0202389B1 (enExample) |
| JP (1) | JPS61221273A (enExample) |
| AT (1) | ATE57950T1 (enExample) |
| AU (1) | AU568449B2 (enExample) |
| CA (1) | CA1248687A (enExample) |
| DE (2) | DE3510691A1 (enExample) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5091508A (en) * | 1989-12-20 | 1992-02-25 | Khanna Yash P | Process for improving the properties of polymers |
| DE10233344A1 (de) * | 2002-07-23 | 2004-02-12 | Degussa Ag | Polyamid-Wirbelsinterpulver für das Dünnschichtwirbelsintern |
| DE10311437A1 (de) * | 2003-03-15 | 2004-09-23 | Degussa Ag | Laser-Sinter-Pulver mit PMMI, PMMA und/oder PMMI-PMMA-Copolymeren, Verfahren zu dessen Herstellung und Formkörper, hergestellt aus diesem Laser-Sinterpulver |
| US8232261B2 (en) | 2003-07-18 | 2012-07-31 | Bayer Cropscience Lp | Method of minimizing herbicidal injury |
| FR2905700B1 (fr) * | 2006-09-08 | 2008-11-14 | Arkema France | Poudre autoadherente haute performance sans promoteur d'adhesion a base de polyamide |
| JP2008303304A (ja) * | 2007-06-07 | 2008-12-18 | Metal Color:Kk | 結晶性ポリアミド微粒子の製造方法 |
| US9468891B2 (en) * | 2011-03-23 | 2016-10-18 | M. Technique Co., Ltd. | Method for producing microparticles |
| DE102011078719A1 (de) | 2011-07-06 | 2013-01-10 | Evonik Degussa Gmbh | Pulver enthaltend mit Polymer beschichtete Partikel |
| DE102011078720A1 (de) | 2011-07-06 | 2013-01-10 | Evonik Degussa Gmbh | Pulver enthaltend mit Polymer beschichtete Kernpartikel enthaltend Metalle, Metalloxide, Metall- oder Halbmetallnitride |
| DE102011078722A1 (de) | 2011-07-06 | 2013-01-10 | Evonik Degussa Gmbh | Pulver enthaltend mit Polymer beschichtete anorganische Partikel |
| DE102011078721A1 (de) | 2011-07-06 | 2013-01-10 | Evonik Degussa Gmbh | Pulver enthaltend mit Polymer beschichtete polymere Kernpartikel |
| EP4245506A1 (de) | 2022-03-15 | 2023-09-20 | Evonik Operations GmbH | Pulver zur verarbeitung in einem schichtweisen verfahren mit lasern im sichtbaren und nahinfrarotbereich |
| DE202022000644U1 (de) | 2022-03-15 | 2022-04-21 | Evonik Operations Gmbh | Pulver zur Verarbeitung in einem schichtweisen Verfahren mit Lasern im sichtbaren und Nahinfrarotbereich |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4143025A (en) * | 1975-10-09 | 1979-03-06 | Chemische Werke Huls Ag | Method for producing polylaurolactam powder compositions for the coating of metals at high temperatures |
| DE2906647C2 (de) * | 1979-02-21 | 1980-12-11 | Chemische Werke Huels Ag, 4370 Marl | Verfahren zur Herstellung von pulver· förmigen Beschichtungsmittel!! auf der Basis von Polyamiden mit mindestens 10 aliphatisch gebundenen Kohlenstoffatomen pro Carbonamidgruppe |
| DE3510690A1 (de) * | 1985-03-23 | 1986-09-25 | Hüls AG, 4370 Marl | Verfahren zur herstellung von nachkondensierbaren, hochmolekularen beschichtungsmitteln auf der basis von polyamiden nach dem faellungsverfahren |
| DE3510689A1 (de) * | 1985-03-23 | 1986-09-25 | Hüls AG, 4370 Marl | Verfahren zur herstellung von pulverfoermigen beschichtungsmitteln praktisch einheitlicher korngroessen auf der basis von polyamiden mit mindestens 10 aliphatisch gebundenen kohlenstoffatomen pro carbonamidgruppe |
| DE3510688A1 (de) * | 1985-03-23 | 1986-09-25 | Hüls AG, 4370 Marl | Beschichtungspulver fuer das schmelzueberzugsverfahren auf der basis von polyamiden und haftverbessernden zusaetzen |
-
1985
- 1985-03-23 DE DE19853510691 patent/DE3510691A1/de not_active Withdrawn
-
1986
- 1986-01-23 AT AT86100872T patent/ATE57950T1/de not_active IP Right Cessation
- 1986-01-23 EP EP86100872A patent/EP0202389B1/de not_active Expired - Lifetime
- 1986-01-23 DE DE8686100872T patent/DE3675256D1/de not_active Expired - Lifetime
- 1986-03-18 US US06/840,819 patent/US4687838A/en not_active Expired - Lifetime
- 1986-03-21 CA CA000504769A patent/CA1248687A/en not_active Expired
- 1986-03-21 AU AU54999/86A patent/AU568449B2/en not_active Ceased
- 1986-03-24 JP JP61064294A patent/JPS61221273A/ja active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61221273A (ja) | 1986-10-01 |
| US4687838A (en) | 1987-08-18 |
| EP0202389B1 (de) | 1990-10-31 |
| EP0202389A2 (de) | 1986-11-26 |
| DE3675256D1 (de) | 1990-12-06 |
| AU568449B2 (en) | 1987-12-24 |
| ATE57950T1 (de) | 1990-11-15 |
| AU5499986A (en) | 1986-09-25 |
| DE3510691A1 (de) | 1986-09-25 |
| CA1248687A (en) | 1989-01-10 |
| EP0202389A3 (en) | 1987-11-19 |
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