FI56542C - Foerfarande foer stabilisering av polymerisat - Google Patents
Foerfarande foer stabilisering av polymerisat Download PDFInfo
- Publication number
- FI56542C FI56542C FI3493/72A FI349372A FI56542C FI 56542 C FI56542 C FI 56542C FI 3493/72 A FI3493/72 A FI 3493/72A FI 349372 A FI349372 A FI 349372A FI 56542 C FI56542 C FI 56542C
- Authority
- FI
- Finland
- Prior art keywords
- stabilizers
- stabilizer
- polymer
- temperature
- stabilization
- Prior art date
Links
- 239000003381 stabilizer Substances 0.000 claims description 80
- 229920000642 polymer Polymers 0.000 claims description 56
- 238000000034 method Methods 0.000 claims description 44
- 238000002156 mixing Methods 0.000 claims description 23
- 239000000203 mixture Substances 0.000 claims description 21
- 239000002245 particle Substances 0.000 claims description 13
- 230000006641 stabilisation Effects 0.000 claims description 13
- 238000011105 stabilization Methods 0.000 claims description 13
- 239000000843 powder Substances 0.000 claims description 12
- 238000005054 agglomeration Methods 0.000 claims description 10
- 230000002776 aggregation Effects 0.000 claims description 10
- 230000006698 induction Effects 0.000 claims description 9
- 238000002844 melting Methods 0.000 claims description 9
- 230000008018 melting Effects 0.000 claims description 9
- 230000000087 stabilizing effect Effects 0.000 claims description 9
- 238000005259 measurement Methods 0.000 claims description 8
- 238000005245 sintering Methods 0.000 claims description 7
- 239000012530 fluid Substances 0.000 claims description 4
- 238000006116 polymerization reaction Methods 0.000 claims description 3
- 206010016654 Fibrosis Diseases 0.000 claims 1
- 238000009472 formulation Methods 0.000 claims 1
- 238000010792 warming Methods 0.000 claims 1
- -1 diaryl ketones Chemical class 0.000 description 29
- 239000004698 Polyethylene Substances 0.000 description 15
- 229920000573 polyethylene Polymers 0.000 description 15
- 239000007788 liquid Substances 0.000 description 8
- 238000004898 kneading Methods 0.000 description 5
- 239000007787 solid Substances 0.000 description 5
- 239000000654 additive Substances 0.000 description 4
- 239000000155 melt Substances 0.000 description 4
- 150000002894 organic compounds Chemical class 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 238000004132 cross linking Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 239000012963 UV stabilizer Substances 0.000 description 2
- 229920002877 acrylic styrene acrylonitrile Polymers 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000009969 flowable effect Effects 0.000 description 2
- 210000002196 fr. b Anatomy 0.000 description 2
- 210000000540 fraction c Anatomy 0.000 description 2
- 238000012685 gas phase polymerization Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 238000010557 suspension polymerization reaction Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- HVLLSGMXQDNUAL-UHFFFAOYSA-N triphenyl phosphite Chemical compound C=1C=CC=CC=1OP(OC=1C=CC=CC=1)OC1=CC=CC=C1 HVLLSGMXQDNUAL-UHFFFAOYSA-N 0.000 description 2
- UPYPTOCXMIWHSG-UHFFFAOYSA-N 1-dodecylsulfanyldodecane Chemical group CCCCCCCCCCCCSCCCCCCCCCCCC UPYPTOCXMIWHSG-UHFFFAOYSA-N 0.000 description 1
- LIQNGHDELJNYMK-UHFFFAOYSA-N 2-tert-butyl-4-(3-tert-butyl-4-hydroxy-5-methylphenyl)sulfanyl-6-methylphenol 2-tert-butyl-6-(3-tert-butyl-2-hydroxy-5-methylphenyl)sulfanyl-4-methylphenol dodecyl 3-(3-dodecoxy-3-oxopropyl)sulfanylpropanoate octadecyl 3-(3-octadecoxy-3-oxopropyl)sulfanylpropanoate Chemical compound S(CCC(=O)OCCCCCCCCCCCCCCCCCC)CCC(=O)OCCCCCCCCCCCCCCCCCC.S(CCC(=O)OCCCCCCCCCCCC)CCC(=O)OCCCCCCCCCCCC.S(C1=CC(=C(C(=C1)C(C)(C)C)O)C)C1=CC(=C(C(=C1)C(C)(C)C)O)C.S(C1=C(C(=CC(=C1)C)C(C)(C)C)O)C1=C(C(=CC(=C1)C)C(C)(C)C)O LIQNGHDELJNYMK-UHFFFAOYSA-N 0.000 description 1
- GPNYZBKIGXGYNU-UHFFFAOYSA-N 2-tert-butyl-6-[(3-tert-butyl-5-ethyl-2-hydroxyphenyl)methyl]-4-ethylphenol Chemical compound CC(C)(C)C1=CC(CC)=CC(CC=2C(=C(C=C(CC)C=2)C(C)(C)C)O)=C1O GPNYZBKIGXGYNU-UHFFFAOYSA-N 0.000 description 1
- FJKROLUGYXJWQN-UHFFFAOYSA-N 4-hydroxybenzoic acid Chemical compound OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 description 1
- YAAQEISEHDUIFO-UHFFFAOYSA-N C=CC#N.OC(=O)C=CC=CC1=CC=CC=C1 Chemical compound C=CC#N.OC(=O)C=CC=CC1=CC=CC=C1 YAAQEISEHDUIFO-UHFFFAOYSA-N 0.000 description 1
- FBPFZTCFMRRESA-FSIIMWSLSA-N D-Glucitol Natural products OC[C@H](O)[C@H](O)[C@@H](O)[C@H](O)CO FBPFZTCFMRRESA-FSIIMWSLSA-N 0.000 description 1
- 239000001692 EU approved anti-caking agent Substances 0.000 description 1
- 241001295925 Gegenes Species 0.000 description 1
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 229930040373 Paraformaldehyde Natural products 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 229920001328 Polyvinylidene chloride Polymers 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000000181 anti-adherent effect Effects 0.000 description 1
- 239000003911 antiadherent Substances 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 150000001491 aromatic compounds Chemical class 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000012662 bulk polymerization Methods 0.000 description 1
- KLIYQWXIWMRMGR-UHFFFAOYSA-N buta-1,3-diene;methyl 2-methylprop-2-enoate Chemical compound C=CC=C.COC(=O)C(C)=C KLIYQWXIWMRMGR-UHFFFAOYSA-N 0.000 description 1
- AYBQEWUIMBWDHL-UHFFFAOYSA-N buta-1,3-diene;methyl 2-methylprop-2-enoate;prop-2-enenitrile Chemical compound C=CC=C.C=CC#N.COC(=O)C(C)=C AYBQEWUIMBWDHL-UHFFFAOYSA-N 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 239000007884 disintegrant Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000007720 emulsion polymerization reaction Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 150000002170 ethers Chemical class 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 210000003918 fraction a Anatomy 0.000 description 1
- 238000010528 free radical solution polymerization reaction Methods 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000012760 heat stabilizer Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229920006158 high molecular weight polymer Polymers 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- VLAPMBHFAWRUQP-UHFFFAOYSA-L molybdic acid Chemical compound O[Mo](O)(=O)=O VLAPMBHFAWRUQP-UHFFFAOYSA-L 0.000 description 1
- 239000003605 opacifier Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 235000011837 pasties Nutrition 0.000 description 1
- 150000008379 phenol ethers Chemical class 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920001748 polybutylene Polymers 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920006324 polyoxymethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000005033 polyvinylidene chloride Substances 0.000 description 1
- GDESWOTWNNGOMW-UHFFFAOYSA-N resorcinol monobenzoate Chemical compound OC1=CC=CC(OC(=O)C=2C=CC=CC=2)=C1 GDESWOTWNNGOMW-UHFFFAOYSA-N 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 230000028327 secretion Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000600 sorbitol Substances 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000000375 suspending agent Substances 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 239000003017 thermal stabilizer Substances 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 229920006163 vinyl copolymer Polymers 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- C08J3/20—Compounding polymers with additives, e.g. colouring
- C08J3/203—Solid polymers with solid and/or liquid additives
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL7116953 | 1971-12-10 | ||
| NLAANVRAGE7116953,A NL169599C (nl) | 1971-12-10 | 1971-12-10 | Werkwijze voor het stabiliseren van polymeren. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FI56542B FI56542B (fi) | 1979-10-31 |
| FI56542C true FI56542C (fi) | 1980-02-11 |
Family
ID=19814663
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FI3493/72A FI56542C (fi) | 1971-12-10 | 1972-12-08 | Foerfarande foer stabilisering av polymerisat |
Country Status (18)
| Country | Link |
|---|---|
| US (1) | US3880803A (de) |
| JP (1) | JPS5125253B2 (de) |
| AT (1) | AT318245B (de) |
| AU (1) | AU464391B2 (de) |
| BE (1) | BE792495A (de) |
| BR (1) | BR7208698D0 (de) |
| CA (1) | CA1002681A (de) |
| CS (1) | CS178878B2 (de) |
| DE (1) | DE2260213C2 (de) |
| ES (1) | ES409480A1 (de) |
| FI (1) | FI56542C (de) |
| FR (1) | FR2164419A5 (de) |
| GB (1) | GB1409924A (de) |
| IT (1) | IT973977B (de) |
| NL (1) | NL169599C (de) |
| SE (1) | SE394440B (de) |
| TR (1) | TR17622A (de) |
| ZA (1) | ZA728676B (de) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3987004A (en) * | 1973-04-05 | 1976-10-19 | National Starch And Chemical Corporation | Stabilized polyester compositions |
| US3985705A (en) * | 1973-04-05 | 1976-10-12 | National Starch And Chemical Corporation | Stabilized polyester compositions |
| US4028337A (en) * | 1974-12-20 | 1977-06-07 | Bell Telephone Laboratories, Incorporated | Technique for stabilization of vinyl chloride polymers |
| DE2533729B2 (de) * | 1975-07-28 | 1979-12-13 | Kufner Textilwerke Kg, 8000 Muenchen | Schmelzkleberpulver und Verfahren zu deren Herstellung |
| DE2811922A1 (de) * | 1978-03-18 | 1979-09-27 | Finke Ohg Karl | Harz-farbkonzentrate fuer die einfaerbung von harzen |
| IT1099761B (it) * | 1978-10-05 | 1985-09-28 | Montedison Spa | Procedimento per ottenere composizioni omogenee di polimeri olefinici in forma granulare e di additivi vari |
| DE2901759A1 (de) * | 1979-01-18 | 1980-07-31 | Basf Ag | Verfahren zur herstellung kleinteiliger polyolefin-formmassen mit verbesserten eigenschaften und deren verwendung zur herstellung von formkoerpern |
| FR2516796B1 (fr) * | 1981-11-20 | 1986-06-06 | Altulor Sa | Compositions pour ciment chirurgical a base d'au moins un monomere acrylique et d'au moins un polymere acrylique |
| US4399265A (en) * | 1983-01-19 | 1983-08-16 | Garware Plastics & Polyester Ltd. | Process of products UV-stabilized polyester materials |
| IT1231769B (it) * | 1989-08-02 | 1991-12-21 | Himont Inc | Procedimento per la stabilizzazione di poliolefine e prodotti da esso ottenuti. |
| DE4301808A1 (de) | 1993-01-23 | 1994-07-28 | Huels Chemische Werke Ag | Verfahren zur Einarbeitung von Stabilisatoren in Polykondensate |
| DE4301809A1 (de) * | 1993-01-23 | 1994-07-28 | Huels Chemische Werke Ag | Verfahren zur Einarbeitung von Weichmachern in Polyamide |
| JP3377833B2 (ja) * | 1993-08-06 | 2003-02-17 | 三井化学株式会社 | 環状オレフィン系樹脂からなる成形体およびその製造方法 |
| WO1996032529A1 (en) * | 1995-04-12 | 1996-10-17 | Alliedsignal Inc. | Polymer substrate with additives and thermally induced diffusion process for making |
| ES2247849T3 (es) * | 1998-12-29 | 2006-03-01 | PIRELLI & C. S.P.A. | Procedimiento y aparato para introducir en continuo una substancia en fase liquida en granulos de plastico. |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE570013A (de) * | 1957-08-01 | 1900-01-01 | ||
| US3000841A (en) * | 1958-07-01 | 1961-09-19 | Ware John | Composition and method for incorporating powdered material in rubber and plastic compositions |
| BE582888A (de) * | 1958-09-23 | |||
| BE618292A (de) * | 1961-05-29 | |||
| NL125267C (de) * | 1962-10-02 | |||
| US3546270A (en) * | 1965-07-23 | 1970-12-08 | Geigy Chem Corp | Bis-methylene malonic acid nitriles |
| US3504012A (en) * | 1967-04-07 | 1970-03-31 | Nat Distillers Chem Corp | Hydroxyethyl-beta-(3,5-di-t-butyl-4-hydroxy benzylthio) alkanoate |
| US3637571A (en) * | 1968-04-15 | 1972-01-25 | Rexall Drug Chemical | Process for preparing thermoplastic resin-additive compositions |
| US3640747A (en) * | 1968-09-12 | 1972-02-08 | Polymer Corp | Method of reducing sandiness in vinyl coatings |
| DE1959393B2 (de) * | 1969-11-26 | 1974-09-05 | Wacker-Chemie Gmbh, 8000 Muenchen | Verfahren zur Herstellung von elektrostatisch wenig oder nicht aufgeladenen pulverförmiger! Mischungen auf der Basis von Polyvinylchlorid |
| GB1231130A (de) * | 1969-12-05 | 1971-05-12 | ||
| US3676172A (en) * | 1970-12-14 | 1972-07-11 | Du Pont | Vapor coalescence of powder coatings |
-
0
- BE BE792495D patent/BE792495A/xx not_active IP Right Cessation
-
1971
- 1971-12-10 NL NLAANVRAGE7116953,A patent/NL169599C/xx not_active IP Right Cessation
-
1972
- 1972-12-07 IT IT54586/72A patent/IT973977B/it active
- 1972-12-07 AU AU49792/72A patent/AU464391B2/en not_active Expired
- 1972-12-07 ZA ZA728676A patent/ZA728676B/xx unknown
- 1972-12-07 GB GB5663172A patent/GB1409924A/en not_active Expired
- 1972-12-08 BR BR008698/72A patent/BR7208698D0/pt unknown
- 1972-12-08 CA CA158,543A patent/CA1002681A/en not_active Expired
- 1972-12-08 SE SE7216036A patent/SE394440B/xx unknown
- 1972-12-08 FI FI3493/72A patent/FI56542C/fi active
- 1972-12-08 DE DE2260213A patent/DE2260213C2/de not_active Expired
- 1972-12-09 ES ES409480A patent/ES409480A1/es not_active Expired
- 1972-12-11 US US313636A patent/US3880803A/en not_active Expired - Lifetime
- 1972-12-11 AT AT1051972A patent/AT318245B/de not_active IP Right Cessation
- 1972-12-11 FR FR7243995A patent/FR2164419A5/fr not_active Expired
- 1972-12-11 TR TR17622A patent/TR17622A/xx unknown
- 1972-12-11 JP JP47124252A patent/JPS5125253B2/ja not_active Expired
- 1972-12-11 CS CS7200008476A patent/CS178878B2/cs unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CS178878B2 (en) | 1977-10-31 |
| NL169599C (nl) | 1982-08-02 |
| TR17622A (tr) | 1975-07-23 |
| FI56542B (fi) | 1979-10-31 |
| ZA728676B (en) | 1973-08-29 |
| DE2260213C2 (de) | 1987-02-12 |
| DE2260213A1 (de) | 1973-06-14 |
| NL7116953A (de) | 1973-06-13 |
| AU4979272A (en) | 1974-06-27 |
| AT318245B (de) | 1974-10-10 |
| BR7208698D0 (pt) | 1973-12-11 |
| CA1002681A (en) | 1976-12-28 |
| SE394440B (sv) | 1977-06-27 |
| FR2164419A5 (de) | 1973-07-27 |
| NL169599B (nl) | 1982-03-01 |
| JPS4866145A (de) | 1973-09-11 |
| ES409480A1 (es) | 1975-11-16 |
| GB1409924A (en) | 1975-10-15 |
| IT973977B (it) | 1974-06-10 |
| BE792495A (fr) | 1973-06-08 |
| AU464391B2 (en) | 1975-08-28 |
| JPS5125253B2 (de) | 1976-07-29 |
| US3880803A (en) | 1975-04-29 |
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