NO760840L - - Google Patents
Info
- Publication number
- NO760840L NO760840L NO760840A NO760840A NO760840L NO 760840 L NO760840 L NO 760840L NO 760840 A NO760840 A NO 760840A NO 760840 A NO760840 A NO 760840A NO 760840 L NO760840 L NO 760840L
- Authority
- NO
- Norway
- Prior art keywords
- slurry
- amine
- anionic
- surfactant
- flotation
- Prior art date
Links
- 239000004094 surface-active agent Substances 0.000 claims description 51
- 238000000034 method Methods 0.000 claims description 50
- 239000000693 micelle Substances 0.000 claims description 46
- 238000005188 flotation Methods 0.000 claims description 24
- 239000000203 mixture Substances 0.000 claims description 22
- 239000006185 dispersion Substances 0.000 claims description 18
- 125000000129 anionic group Chemical group 0.000 claims description 17
- -1 alkenyl amine Chemical class 0.000 claims description 13
- 239000003945 anionic surfactant Substances 0.000 claims description 13
- 125000004432 carbon atom Chemical group C* 0.000 claims description 13
- 238000004062 sedimentation Methods 0.000 claims description 13
- 239000000243 solution Substances 0.000 claims description 13
- 150000001412 amines Chemical class 0.000 claims description 12
- 125000002091 cationic group Chemical group 0.000 claims description 11
- 238000005189 flocculation Methods 0.000 claims description 11
- 125000000217 alkyl group Chemical group 0.000 claims description 10
- 238000001914 filtration Methods 0.000 claims description 10
- 230000016615 flocculation Effects 0.000 claims description 10
- 150000001768 cations Chemical class 0.000 claims description 9
- 230000015572 biosynthetic process Effects 0.000 claims description 8
- 238000005119 centrifugation Methods 0.000 claims description 8
- 239000002002 slurry Substances 0.000 claims description 8
- 125000001931 aliphatic group Chemical group 0.000 claims description 7
- 239000012535 impurity Substances 0.000 claims description 6
- 239000013055 pulp slurry Substances 0.000 claims description 6
- 125000003342 alkenyl group Chemical group 0.000 claims description 5
- 239000011575 calcium Substances 0.000 claims description 5
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 5
- 239000000194 fatty acid Substances 0.000 claims description 5
- 229930195729 fatty acid Natural products 0.000 claims description 5
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 3
- 239000007864 aqueous solution Substances 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 229920002401 polyacrylamide Polymers 0.000 claims description 3
- 239000002244 precipitate Substances 0.000 claims description 3
- 239000008394 flocculating agent Substances 0.000 claims 2
- QGLWBTPVKHMVHM-KTKRTIGZSA-N (z)-octadec-9-en-1-amine Chemical compound CCCCCCCC\C=C/CCCCCCCCN QGLWBTPVKHMVHM-KTKRTIGZSA-N 0.000 claims 1
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 claims 1
- REYJJPSVUYRZGE-UHFFFAOYSA-N Octadecylamine Chemical compound CCCCCCCCCCCCCCCCCCN REYJJPSVUYRZGE-UHFFFAOYSA-N 0.000 claims 1
- 229910001424 calcium ion Inorganic materials 0.000 claims 1
- 238000004090 dissolution Methods 0.000 claims 1
- JRBPAEWTRLWTQC-UHFFFAOYSA-N dodecylamine Chemical group CCCCCCCCCCCCN JRBPAEWTRLWTQC-UHFFFAOYSA-N 0.000 claims 1
- 125000005313 fatty acid group Chemical group 0.000 claims 1
- 229910001425 magnesium ion Inorganic materials 0.000 claims 1
- 229910021645 metal ion Inorganic materials 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 31
- 239000000976 ink Substances 0.000 description 16
- 239000000126 substance Substances 0.000 description 16
- 239000002245 particle Substances 0.000 description 15
- 238000000926 separation method Methods 0.000 description 15
- 239000000344 soap Substances 0.000 description 11
- 229920000867 polyelectrolyte Polymers 0.000 description 9
- 238000004140 cleaning Methods 0.000 description 8
- 239000000356 contaminant Substances 0.000 description 7
- 239000000835 fiber Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000011230 binding agent Substances 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 5
- 244000144992 flock Species 0.000 description 5
- 229920000642 polymer Polymers 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- 230000002776 aggregation Effects 0.000 description 4
- 150000004665 fatty acids Chemical class 0.000 description 4
- 230000020477 pH reduction Effects 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 229920001131 Pulp (paper) Polymers 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000005054 agglomeration Methods 0.000 description 3
- 125000002877 alkyl aryl group Chemical group 0.000 description 3
- 125000003118 aryl group Chemical group 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 239000000706 filtrate Substances 0.000 description 3
- 230000002209 hydrophobic effect Effects 0.000 description 3
- 239000002736 nonionic surfactant Substances 0.000 description 3
- 238000004537 pulping Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- 239000003929 acidic solution Substances 0.000 description 2
- 229920006318 anionic polymer Polymers 0.000 description 2
- 238000004061 bleaching Methods 0.000 description 2
- 239000007844 bleaching agent Substances 0.000 description 2
- 159000000007 calcium salts Chemical class 0.000 description 2
- 239000002761 deinking Substances 0.000 description 2
- 238000007598 dipping method Methods 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 229920006158 high molecular weight polymer Polymers 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 125000001117 oleyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])/C([H])=C([H])\C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- 239000012860 organic pigment Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- RSWGJHLUYNHPMX-UHFFFAOYSA-N 1,4a-dimethyl-7-propan-2-yl-2,3,4,4b,5,6,10,10a-octahydrophenanthrene-1-carboxylic acid Chemical compound C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 1
- SNRUBQQJIBEYMU-UHFFFAOYSA-N Dodecane Natural products CCCCCCCCCCCC SNRUBQQJIBEYMU-UHFFFAOYSA-N 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 206010034962 Photopsia Diseases 0.000 description 1
- 241000872198 Serjania polyphylla Species 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 229920001448 anionic polyelectrolyte Polymers 0.000 description 1
- 239000008346 aqueous phase Substances 0.000 description 1
- 125000005228 aryl sulfonate group Chemical group 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000003637 basic solution Substances 0.000 description 1
- 239000000872 buffer Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 125000002057 carboxymethyl group Chemical group [H]OC(=O)C([H])([H])[*] 0.000 description 1
- 239000003093 cationic surfactant Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000001246 colloidal dispersion Methods 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000009918 complex formation Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 125000002704 decyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000004205 dimethyl polysiloxane Substances 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 125000003438 dodecyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- MOTZDAYCYVMXPC-UHFFFAOYSA-N dodecyl hydrogen sulfate Chemical compound CCCCCCCCCCCCOS(O)(=O)=O MOTZDAYCYVMXPC-UHFFFAOYSA-N 0.000 description 1
- 229940043264 dodecyl sulfate Drugs 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 229920000831 ionic polymer Polymers 0.000 description 1
- 125000005645 linoleyl group Chemical group 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 125000005702 oxyalkylene group Chemical group 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 229910000065 phosphene Inorganic materials 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 description 1
- 229920001467 poly(styrenesulfonates) Polymers 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920001451 polypropylene glycol Polymers 0.000 description 1
- 229960002796 polystyrene sulfonate Drugs 0.000 description 1
- 239000011970 polystyrene sulfonate Substances 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 230000005588 protonation Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 150000003335 secondary amines Chemical class 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 229960005480 sodium caprylate Drugs 0.000 description 1
- RYYKJJJTJZKILX-UHFFFAOYSA-M sodium octadecanoate Chemical compound [Na+].CCCCCCCCCCCCCCCCCC([O-])=O RYYKJJJTJZKILX-UHFFFAOYSA-M 0.000 description 1
- BYKRNSHANADUFY-UHFFFAOYSA-M sodium octanoate Chemical compound [Na+].CCCCCCCC([O-])=O BYKRNSHANADUFY-UHFFFAOYSA-M 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 150000001629 stilbenes Chemical class 0.000 description 1
- 235000021286 stilbenes Nutrition 0.000 description 1
- 125000001424 substituent group Chemical group 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 150000003512 tertiary amines Chemical class 0.000 description 1
- 125000003944 tolyl group Chemical group 0.000 description 1
- 125000004417 unsaturated alkyl group Chemical group 0.000 description 1
- 238000004383 yellowing Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
- D21C5/02—Working-up waste paper
- D21C5/025—De-inking
- D21C5/027—Chemicals therefor
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/64—Paper recycling
Landscapes
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Toxicology (AREA)
- Paper (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE7502720A SE406482B (sv) | 1975-03-11 | 1975-03-11 | Forfarande for rening av en vattenhaltig dispersion eller massauppslamning |
Publications (1)
Publication Number | Publication Date |
---|---|
NO760840L true NO760840L (sv) | 1976-09-14 |
Family
ID=20323922
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NO760840A NO760840L (sv) | 1975-03-11 | 1976-03-10 |
Country Status (14)
Country | Link |
---|---|
US (1) | US4043908A (sv) |
JP (1) | JPS5231563A (sv) |
AT (1) | AT357862B (sv) |
AU (1) | AU504797B2 (sv) |
CA (1) | CA1068019A (sv) |
DE (1) | DE2610277C3 (sv) |
ES (1) | ES445941A1 (sv) |
FI (1) | FI760583A (sv) |
FR (1) | FR2313500A1 (sv) |
GB (1) | GB1546813A (sv) |
IT (1) | IT1057340B (sv) |
NL (1) | NL7602000A (sv) |
NO (1) | NO760840L (sv) |
SE (1) | SE406482B (sv) |
Families Citing this family (26)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4599190A (en) * | 1979-11-13 | 1986-07-08 | Diamond Shamrock Chemicals Company | Composition for drinking secondary fibers |
SE439787B (sv) * | 1984-03-19 | 1985-07-01 | Berol Kemi Ab | Sett att reducera missfergning och/eller klibbighet vid upparbetning av avfallspapper |
US4676912A (en) * | 1986-06-26 | 1987-06-30 | International Minerals & Chemical Corp. | Waste liquor disposal methods |
DE3642362A1 (de) * | 1986-12-11 | 1988-06-16 | Schill & Seilacher | Mittel zur abtrennung dispergierter teilchen aus dispersionen |
DE3811025A1 (de) * | 1988-03-31 | 1989-10-12 | Gruenau Gmbh Chem Fab | Verfahren zum de-inken von bedrucktem altpapier |
EP0407501A4 (en) * | 1988-10-26 | 1991-07-24 | Miranol Inc. | Method and composition for deinking recycled paper pulp |
DE4007597A1 (de) * | 1990-03-09 | 1991-09-12 | Henkel Kgaa | Wasserloesliche oder wasserdispergierbare, polyetherketten und quaternaere ammoniumgruppen enthaltende verbindungen |
DE4008894A1 (de) * | 1990-03-20 | 1991-09-26 | Call Hans Peter | Verfahren zur altpapieraufbereitung mit enzymatischer druckfarbenentfernung |
US5385695A (en) * | 1990-05-15 | 1995-01-31 | Cohen; Elliot | Demulsifier methods employing b-iminodipropionate |
US5286390A (en) * | 1992-09-30 | 1994-02-15 | Calgon Corporation | Method for treating deink wastes using melamine aldehyde-type polymers |
US5415733A (en) * | 1993-05-27 | 1995-05-16 | High Point Chemical Corp. | Method of removing hydrophilic ink |
US5320758A (en) * | 1993-06-29 | 1994-06-14 | Church & Dwight Co., Inc. | Method of recycling amine saponifiers used in cleaning electronic circuit boards |
US5560805A (en) * | 1993-07-27 | 1996-10-01 | Hoechst Celanese Corporation | Enhanced decolorization of waste paper with selected amines |
US5385639A (en) * | 1993-08-27 | 1995-01-31 | Hoechst Celanese Corporation | Deinking wastepaper printed with oil-based ink |
AU677468B2 (en) * | 1994-02-02 | 1997-04-24 | Hercules Incorporated | Felt conditioner for deinked recycled newsprint papermaking systems |
US5632857A (en) * | 1995-04-04 | 1997-05-27 | Rhone-Poulenc Inc. | Process for removing waterborne flexographic inks from substrates |
US6251220B1 (en) * | 1995-04-05 | 2001-06-26 | Kao Corporation | Wastepaper deinking method using amine or acid salt of amine in the flotation stage |
DE19532476A1 (de) * | 1995-09-02 | 1997-03-06 | Winfried Prof Dr Schmidt | Verfahren und Vorrichtung zur Behandlung von ölhaltigen Abwässern, insbesondere zur Trennung von Öl-in-Wasser-Emulsionen |
JP2958269B2 (ja) * | 1996-06-03 | 1999-10-06 | 花王株式会社 | 脱墨方法 |
JP3051826B2 (ja) | 1996-06-03 | 2000-06-12 | 花王株式会社 | 脱墨方法 |
JP3405888B2 (ja) * | 1996-09-25 | 2003-05-12 | 花王株式会社 | 脱墨方法 |
US6312559B1 (en) * | 1996-10-02 | 2001-11-06 | Kao Corporation | Deinking process using amine compounds and white water recycling |
JP3262517B2 (ja) * | 1996-10-02 | 2002-03-04 | 花王株式会社 | 脱墨方法 |
US20050119353A1 (en) * | 2001-09-25 | 2005-06-02 | Detorres Fernando A. | Contaminant eco-remedy and use method |
EP2236665A4 (en) * | 2008-01-22 | 2012-12-12 | Lion Corp | CLEANER FOR POWER PULP AND MANUFACTURING METHOD FOR POWDERED CELLULOSE MATERIAL |
FR3037084B1 (fr) * | 2015-06-02 | 2020-01-10 | Coatex | Procede de desencrage de papier de recuperation |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2005742A (en) * | 1934-05-25 | 1935-06-25 | Pierre R Hines | Process for deinking imprinted paper |
FR1472923A (fr) * | 1963-12-30 | 1967-03-17 | Hollifield Corp | Procédé pour clarifier des fluides effluents de déchets provenant du désencrage de papiers imprimés |
-
1975
- 1975-03-11 SE SE7502720A patent/SE406482B/sv unknown
-
1976
- 1976-02-19 AU AU11244/76A patent/AU504797B2/en not_active Expired
- 1976-02-26 NL NL7602000A patent/NL7602000A/xx not_active Application Discontinuation
- 1976-03-08 FI FI760583A patent/FI760583A/fi not_active Application Discontinuation
- 1976-03-09 IT IT4848676A patent/IT1057340B/it active
- 1976-03-09 AT AT172376A patent/AT357862B/de not_active IP Right Cessation
- 1976-03-10 ES ES445941A patent/ES445941A1/es not_active Expired
- 1976-03-10 NO NO760840A patent/NO760840L/no unknown
- 1976-03-10 FR FR7606842A patent/FR2313500A1/fr active Granted
- 1976-03-10 CA CA247,582A patent/CA1068019A/en not_active Expired
- 1976-03-11 DE DE2610277A patent/DE2610277C3/de not_active Expired
- 1976-03-11 GB GB982076A patent/GB1546813A/en not_active Expired
- 1976-03-11 US US05/666,104 patent/US4043908A/en not_active Expired - Lifetime
- 1976-03-11 JP JP2563776A patent/JPS5231563A/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
FR2313500B1 (sv) | 1979-10-05 |
FR2313500A1 (fr) | 1976-12-31 |
ATA172376A (de) | 1979-12-15 |
FI760583A (sv) | 1976-09-12 |
DE2610277B2 (de) | 1979-12-13 |
SE7502720L (sv) | 1976-09-13 |
IT1057340B (it) | 1982-03-10 |
JPS5231563A (en) | 1977-03-10 |
US4043908A (en) | 1977-08-23 |
CA1068019A (en) | 1979-12-11 |
SE406482B (sv) | 1979-02-12 |
DE2610277C3 (de) | 1980-09-04 |
ES445941A1 (es) | 1977-05-16 |
NL7602000A (nl) | 1976-09-14 |
GB1546813A (en) | 1979-05-31 |
AU1124476A (en) | 1977-08-25 |
DE2610277A1 (de) | 1976-09-23 |
AT357862B (de) | 1980-08-11 |
AU504797B2 (en) | 1979-11-01 |
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