DE1237320B - Verfahren zur Gewinnung reiner Olefinpolymerisate - Google Patents
Verfahren zur Gewinnung reiner OlefinpolymerisateInfo
- Publication number
- DE1237320B DE1237320B DEB41430A DEB0041430A DE1237320B DE 1237320 B DE1237320 B DE 1237320B DE B41430 A DEB41430 A DE B41430A DE B0041430 A DEB0041430 A DE B0041430A DE 1237320 B DE1237320 B DE 1237320B
- Authority
- DE
- Germany
- Prior art keywords
- parts
- solution
- weight
- polymer
- ash content
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims description 7
- 229920000098 polyolefin Polymers 0.000 title claims description 6
- 229920000642 polymer Polymers 0.000 claims description 24
- 239000003054 catalyst Substances 0.000 claims description 19
- 238000001914 filtration Methods 0.000 claims description 7
- 238000006116 polymerization reaction Methods 0.000 claims description 6
- 238000004062 sedimentation Methods 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- 239000002904 solvent Substances 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 4
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 3
- 239000005977 Ethylene Substances 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 239000000706 filtrate Substances 0.000 claims description 3
- 239000000047 product Substances 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 claims description 2
- 238000004090 dissolution Methods 0.000 claims description 2
- 239000012535 impurity Substances 0.000 claims description 2
- 239000003960 organic solvent Substances 0.000 claims description 2
- 238000001556 precipitation Methods 0.000 claims description 2
- RWGFKTVRMDUZSP-UHFFFAOYSA-N cumene Chemical compound CC(C)C1=CC=CC=C1 RWGFKTVRMDUZSP-UHFFFAOYSA-N 0.000 claims 8
- -1 polyethylene Polymers 0.000 claims 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 6
- 239000004698 Polyethylene Substances 0.000 claims 5
- 229920000573 polyethylene Polymers 0.000 claims 5
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims 3
- 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 claims 3
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims 3
- 150000001336 alkenes Chemical class 0.000 claims 3
- 238000002844 melting Methods 0.000 claims 3
- 230000008018 melting Effects 0.000 claims 3
- 229910052708 sodium Inorganic materials 0.000 claims 3
- 239000011734 sodium Substances 0.000 claims 3
- 239000010936 titanium Substances 0.000 claims 3
- 229910052719 titanium Inorganic materials 0.000 claims 3
- 239000008096 xylene Substances 0.000 claims 3
- KVNYFPKFSJIPBJ-UHFFFAOYSA-N 1,2-diethylbenzene Chemical compound CCC1=CC=CC=C1CC KVNYFPKFSJIPBJ-UHFFFAOYSA-N 0.000 claims 2
- YNQLUTRBYVCPMQ-UHFFFAOYSA-N Ethylbenzene Chemical compound CCC1=CC=CC=C1 YNQLUTRBYVCPMQ-UHFFFAOYSA-N 0.000 claims 2
- 239000004743 Polypropylene Substances 0.000 claims 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims 2
- 238000009835 boiling Methods 0.000 claims 2
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 claims 2
- 229920001155 polypropylene Polymers 0.000 claims 2
- 239000013049 sediment Substances 0.000 claims 2
- OKIRBHVFJGXOIS-UHFFFAOYSA-N 1,2-di(propan-2-yl)benzene Chemical compound CC(C)C1=CC=CC=C1C(C)C OKIRBHVFJGXOIS-UHFFFAOYSA-N 0.000 claims 1
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical group CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 claims 1
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims 1
- 238000012935 Averaging Methods 0.000 claims 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims 1
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 claims 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims 1
- 241001676573 Minium Species 0.000 claims 1
- 229910004298 SiO 2 Inorganic materials 0.000 claims 1
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 claims 1
- 239000000654 additive Substances 0.000 claims 1
- 230000000996 additive effect Effects 0.000 claims 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims 1
- 238000004061 bleaching Methods 0.000 claims 1
- 230000005587 bubbling Effects 0.000 claims 1
- 230000015556 catabolic process Effects 0.000 claims 1
- 239000003795 chemical substances by application Substances 0.000 claims 1
- 229910052804 chromium Inorganic materials 0.000 claims 1
- 239000011651 chromium Substances 0.000 claims 1
- 238000011109 contamination Methods 0.000 claims 1
- 238000001816 cooling Methods 0.000 claims 1
- 229920001577 copolymer Polymers 0.000 claims 1
- 239000012043 crude product Substances 0.000 claims 1
- 230000007423 decrease Effects 0.000 claims 1
- 238000006731 degradation reaction Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 claims 1
- 238000005516 engineering process Methods 0.000 claims 1
- 239000001257 hydrogen Substances 0.000 claims 1
- 229910052739 hydrogen Inorganic materials 0.000 claims 1
- 239000011261 inert gas Substances 0.000 claims 1
- 239000002075 main ingredient Substances 0.000 claims 1
- 239000000463 material Substances 0.000 claims 1
- XULSCZPZVQIMFM-IPZQJPLYSA-N odevixibat Chemical compound C12=CC(SC)=C(OCC(=O)N[C@@H](C(=O)N[C@@H](CC)C(O)=O)C=3C=CC(O)=CC=3)C=C2S(=O)(=O)NC(CCCC)(CCCC)CN1C1=CC=CC=C1 XULSCZPZVQIMFM-IPZQJPLYSA-N 0.000 claims 1
- 239000001301 oxygen Substances 0.000 claims 1
- 229910052760 oxygen Inorganic materials 0.000 claims 1
- 230000001376 precipitating effect Effects 0.000 claims 1
- 238000000746 purification Methods 0.000 claims 1
- 239000000725 suspension Substances 0.000 claims 1
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 claims 1
- 238000010626 work up procedure Methods 0.000 claims 1
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- PAYRUJLWNCNPSJ-UHFFFAOYSA-N Aniline Chemical compound NC1=CC=CC=C1 PAYRUJLWNCNPSJ-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 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
- 239000002245 particle Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 239000011260 aqueous acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000003925 fat Substances 0.000 description 1
- 150000002366 halogen compounds Chemical class 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052901 montmorillonite Inorganic materials 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 125000005624 silicic acid group Chemical class 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000012265 solid product Substances 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F10/00—Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F6/00—Post-polymerisation treatments
- C08F6/02—Neutralisation of the polymerisation mass, e.g. killing the catalyst also removal of catalyst residues
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BE559729D BE559729A (en, 2012) | 1956-08-17 | ||
| DEB41430A DE1237320B (de) | 1956-08-17 | 1956-08-17 | Verfahren zur Gewinnung reiner Olefinpolymerisate |
| US676499A US3001977A (en) | 1956-08-17 | 1957-08-06 | Recovery of pure olefine polymers |
| FR1180941D FR1180941A (fr) | 1956-08-17 | 1957-08-08 | Procédé pour l'obtention de polymères d'oléfines purs |
| GB25497/57A GB828650A (en) | 1956-08-17 | 1957-08-13 | Improvements in the recovery of pure olefine polymers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEB41430A DE1237320B (de) | 1956-08-17 | 1956-08-17 | Verfahren zur Gewinnung reiner Olefinpolymerisate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE1237320B true DE1237320B (de) | 1967-03-23 |
Family
ID=6966389
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEB41430A Pending DE1237320B (de) | 1956-08-17 | 1956-08-17 | Verfahren zur Gewinnung reiner Olefinpolymerisate |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US3001977A (en, 2012) |
| BE (1) | BE559729A (en, 2012) |
| DE (1) | DE1237320B (en, 2012) |
| FR (1) | FR1180941A (en, 2012) |
| GB (1) | GB828650A (en, 2012) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4284762A (en) * | 1978-12-14 | 1981-08-18 | Kyowa Chemical Industry Co., Ltd. | Method for inhibiting corrosion-causing tendency and coloration of halogen-containing olefin resins with hydrotalcite |
| EP0849312A1 (de) * | 1996-12-19 | 1998-06-24 | Paraffinwerk Webau GmbH | Verfahren zur Gewinnung von Polyolefinen aus polyolefin-haltigen Kunststoff-Gemischen oder polyolefinhaltigen Abfällen |
Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL254392A (en, 2012) * | 1959-07-31 | |||
| US3114742A (en) * | 1959-11-05 | 1963-12-17 | Nat Distillers Chem Corp | Removal of catalyst from polyolefin by treating with water and oxidizing agent |
| DE1295812B (de) * | 1964-08-08 | 1969-05-22 | Basf Ag | Verfahren zur Herstellung gelfreier Loesungen von Dien-Polymerisaten |
| DE2048632C3 (de) * | 1970-10-03 | 1988-02-11 | Toray Industries, Inc., Tokio/Tokyo | Verfahren zur Herstellung von schlagfestem, mit Kautschuk modifiziertem thermoplastischem Harz |
| USRE29004E (en) * | 1973-12-21 | 1976-10-12 | Gulf Research & Development Company | Deactivating and removing aluminum and titanium contaminant from Ziegler-Natta polymerization mixtures |
| US4156075A (en) * | 1977-08-29 | 1979-05-22 | Eastman Kodak Company | Two step polyolefin catalyst deactivation |
| DE102010031314A1 (de) | 2010-07-14 | 2012-01-19 | Evonik Röhm Gmbh | Schwefelfreie Entfernung von Übergangsmetallkatalysatoren |
| RU2687975C1 (ru) | 2015-06-30 | 2019-05-17 | Дзе Проктер Энд Гэмбл Компани | Способ очистки загрязненных полимеров |
| WO2017003797A1 (en) | 2015-06-30 | 2017-01-05 | The Procter & Gamble Company | Method for purifying contaminated polymers |
| EP3112406A1 (en) | 2015-06-30 | 2017-01-04 | The Procter and Gamble Company | Method for purifying contaminated polyolefins |
| CN107709428B (zh) | 2015-06-30 | 2020-12-08 | 宝洁公司 | 用于纯化受污染的聚合物的方法 |
| US10442912B2 (en) | 2016-12-20 | 2019-10-15 | The Procter & Gamble Company | Method for purifying reclaimed polyethylene |
| US10465058B2 (en) | 2016-12-20 | 2019-11-05 | The Procter & Gamble Company | Method for purifying reclaimed polymers |
| US10450436B2 (en) | 2016-12-20 | 2019-10-22 | The Procter & Gamble Company | Method for purifying reclaimed polypropylene |
| US10435532B2 (en) | 2016-12-20 | 2019-10-08 | The Procter & Gamble Company | Method for separating and purifying materials from a reclaimed product |
| US11008433B2 (en) | 2018-06-20 | 2021-05-18 | The Procter & Gamble Company | Method for separating and purifying polymers from reclaimed product |
| US10941269B2 (en) | 2018-06-20 | 2021-03-09 | The Procter & Gamble Company | Method for purifying reclaimed polyethylene |
| US10961366B2 (en) | 2018-06-20 | 2021-03-30 | The Procter & Gamble Company | Method for purifying reclaimed polymers |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE543837A (en, 2012) * | 1954-12-27 | |||
| DE906268C (de) * | 1937-10-02 | 1954-03-11 | Standard Oil Dev Co | Verfahren zur Herstellung hochmolekularer Polymerisationsprodukte aus Isoolefinen |
| DE1124245B (de) * | 1957-05-01 | 1962-02-22 | Du Pont | Verfahren zur Entfernung von metallhaltigen Katalysatorrueckstaenden aus Kohlenwasserstoffpolymerisaten |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2374272A (en) * | 1937-08-21 | 1945-04-24 | Standard Oil Co | Olefin polymerization process |
| US2356128A (en) * | 1939-10-20 | 1944-08-22 | Jasco Inc | Mixed olefinic polymerization process and product |
| US2565960A (en) * | 1946-07-06 | 1951-08-28 | Standard Oil Dev Co | Preparation of an improved hydrocarbon resin |
| US2636016A (en) * | 1949-10-11 | 1953-04-21 | Standard Oil Dev Co | Purifying synthetic resins |
| US2703783A (en) * | 1950-04-28 | 1955-03-08 | Exxon Research Engineering Co | Process for the clarification of lubricating oil additive concentrates |
| NL88142C (en, 2012) * | 1952-12-06 | |||
| US2725374A (en) * | 1954-01-14 | 1955-11-29 | Standard Oil Co | Polymerization of ethylene with alkali metal and group vi a metal oxide |
| NL95589C (en, 2012) * | 1954-04-05 | |||
| US2849429A (en) * | 1955-05-02 | 1958-08-26 | Phillips Petroleum Co | Filtration and catalyst regeneration in olefin polymerization |
| BE554363A (en, 2012) * | 1956-01-20 |
-
0
- BE BE559729D patent/BE559729A/xx unknown
-
1956
- 1956-08-17 DE DEB41430A patent/DE1237320B/de active Pending
-
1957
- 1957-08-06 US US676499A patent/US3001977A/en not_active Expired - Lifetime
- 1957-08-08 FR FR1180941D patent/FR1180941A/fr not_active Expired
- 1957-08-13 GB GB25497/57A patent/GB828650A/en not_active Expired
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE906268C (de) * | 1937-10-02 | 1954-03-11 | Standard Oil Dev Co | Verfahren zur Herstellung hochmolekularer Polymerisationsprodukte aus Isoolefinen |
| BE543837A (en, 2012) * | 1954-12-27 | |||
| DE1124245B (de) * | 1957-05-01 | 1962-02-22 | Du Pont | Verfahren zur Entfernung von metallhaltigen Katalysatorrueckstaenden aus Kohlenwasserstoffpolymerisaten |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4284762A (en) * | 1978-12-14 | 1981-08-18 | Kyowa Chemical Industry Co., Ltd. | Method for inhibiting corrosion-causing tendency and coloration of halogen-containing olefin resins with hydrotalcite |
| US4347353A (en) * | 1978-12-14 | 1982-08-31 | Kyowa Chemical Industry, Co., Ltd. | Method for inhibiting the corrosion-causing tendency and coloration of halogen-containing olefin resin blends |
| EP0849312A1 (de) * | 1996-12-19 | 1998-06-24 | Paraffinwerk Webau GmbH | Verfahren zur Gewinnung von Polyolefinen aus polyolefin-haltigen Kunststoff-Gemischen oder polyolefinhaltigen Abfällen |
Also Published As
| Publication number | Publication date |
|---|---|
| BE559729A (en, 2012) | |
| US3001977A (en) | 1961-09-26 |
| FR1180941A (fr) | 1959-06-10 |
| GB828650A (en) | 1960-02-24 |
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