FR2401945A1 - Compositions et procedes pour le faconnage thermoplastique du polyterephtalate d'ethylene - Google Patents
Compositions et procedes pour le faconnage thermoplastique du polyterephtalate d'ethyleneInfo
- Publication number
- FR2401945A1 FR2401945A1 FR7825345A FR7825345A FR2401945A1 FR 2401945 A1 FR2401945 A1 FR 2401945A1 FR 7825345 A FR7825345 A FR 7825345A FR 7825345 A FR7825345 A FR 7825345A FR 2401945 A1 FR2401945 A1 FR 2401945A1
- Authority
- FR
- France
- Prior art keywords
- compositions
- methods
- thermoplastic forming
- ethylene polyterephthalate
- polyterephthalate
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title abstract 3
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 title 1
- 239000005977 Ethylene Substances 0.000 title 1
- 239000000203 mixture Substances 0.000 title 1
- 238000010104 thermoplastic forming Methods 0.000 title 1
- 229920002732 Polyanhydride Polymers 0.000 abstract 1
- 239000006260 foam Substances 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 abstract 1
- -1 polytetrafluoroethylene Polymers 0.000 abstract 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 abstract 1
- 239000004810 polytetrafluoroethylene Substances 0.000 abstract 1
- 238000007493 shaping process Methods 0.000 abstract 1
- 229920001169 thermoplastic Polymers 0.000 abstract 1
- 239000004416 thermosoftening plastic Substances 0.000 abstract 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
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0014—Use of organic additives
- C08J9/0023—Use of organic additives containing oxygen
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/0005—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor characterised by the material
-
- 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
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
- C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
- C08G63/16—Dicarboxylic acids and dihydroxy compounds
- C08G63/20—Polyesters having been prepared in the presence of compounds having one reactive group or more than two reactive groups
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/15—Heterocyclic compounds having oxygen in the ring
-
- 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
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
- Y10T428/1397—Single layer [continuous layer]
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31786—Of polyester [e.g., alkyd, etc.]
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Emergency Medicine (AREA)
- Materials Engineering (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
L'invention concerne un procédé de façonnage thermoplastique de polytétrafluoroéthylène. Selon ce procédé, on ajoute 0,1 à 5 % en poids d'un polyanhydride avant la transformation. Application à la fabrication d'articles soufflés à parois minces, de films soufflés ou de mousses.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US05/830,240 US4145466A (en) | 1977-09-02 | 1977-09-02 | Melt strength improvement of PET |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2401945A1 true FR2401945A1 (fr) | 1979-03-30 |
FR2401945B1 FR2401945B1 (fr) | 1983-08-05 |
Family
ID=25256607
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7825345A Granted FR2401945A1 (fr) | 1977-09-02 | 1978-09-01 | Compositions et procedes pour le faconnage thermoplastique du polyterephtalate d'ethylene |
Country Status (9)
Country | Link |
---|---|
US (1) | US4145466A (fr) |
JP (1) | JPS5450062A (fr) |
CA (1) | CA1117243A (fr) |
DE (1) | DE2837846A1 (fr) |
FR (1) | FR2401945A1 (fr) |
GB (2) | GB1596976A (fr) |
IT (1) | IT1108761B (fr) |
NL (1) | NL7808948A (fr) |
SE (1) | SE433359B (fr) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1986000319A1 (fr) * | 1984-06-28 | 1986-01-16 | Bergwerksverband Gmbh | Procede de preparation de polymeres synthetiques sous forme de mousses |
EP0372846A2 (fr) * | 1988-12-01 | 1990-06-13 | Sekisui Kaseihin Kogyo Kabushiki Kaisha | Procédé pour préparer une mousse de résine de polyester |
EP0475142A2 (fr) * | 1990-09-05 | 1992-03-18 | Harold Verity Smith | Composition de moulage à base du produit de réaction d'un polyéréphatalate d'éthylène et d'un copolymère d'anhydride maléique |
EP1061093A2 (fr) * | 1999-06-16 | 2000-12-20 | Nippon Shokubai Co., Ltd. | Procédé de préparation d'une composition de résine thermoplastique à poids moléculaire élevé et leur utilisation |
Families Citing this family (50)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4419485A (en) * | 1973-07-25 | 1983-12-06 | General Electric Company | Shaped articles and process for the production thereof |
EP0142948A3 (fr) * | 1983-10-24 | 1985-10-09 | Teijin Limited | Production d'un corps cylindrique à paroi mince en polyester aromatique |
JPS6286031A (ja) * | 1985-10-14 | 1987-04-20 | Dainichi Color & Chem Mfg Co Ltd | 脱臭性成形物 |
JPH0733048B2 (ja) * | 1987-04-08 | 1995-04-12 | ポリプラスチックス株式会社 | ポリブチレンテレフタレ−ト樹脂フイルムの製造法 |
US4919875A (en) * | 1988-05-09 | 1990-04-24 | E. I. Du Pont De Nemours And Company | Oriented polymeric tape preparation |
JP2528514B2 (ja) * | 1989-04-06 | 1996-08-28 | 積水化成品工業株式会社 | 熱可塑性ポリエステル系樹脂発泡シ―ト |
JPH02150434A (ja) * | 1988-12-01 | 1990-06-08 | Sekisui Plastics Co Ltd | ポリエステル系樹脂発泡体の製造法 |
JPH02251543A (ja) * | 1989-01-12 | 1990-10-09 | Sekisui Plastics Co Ltd | ポリエステル系樹脂発泡体の製造法 |
CH678184A5 (fr) * | 1989-03-09 | 1991-08-15 | Tisslan S A | |
US5102952A (en) * | 1989-08-04 | 1992-04-07 | Rohm And Haas Company | Thermoplastic polymer compositions containing melt-rheology modifiers |
JP2866727B2 (ja) * | 1990-09-27 | 1999-03-08 | 三菱樹脂株式会社 | 熱収縮性チューブ |
WO1992019440A1 (fr) * | 1991-05-01 | 1992-11-12 | Danforth Biomedical, Inc. | Catheter a ballon ameliore en polyethylene-terephtalate (pet) d'un faible poids moleculaire |
US5268438A (en) * | 1991-09-06 | 1993-12-07 | Rohm And Haas Company | Aromatic polyester melt strength improver |
US5229432A (en) * | 1992-11-24 | 1993-07-20 | E. I. Du Pont De Nemours And Company | High melt strength pet polymers for foam applications and methods relating thereto |
US5536793A (en) * | 1993-01-29 | 1996-07-16 | Amoco Corporation | Concentrate for use in the melt fabrication of polyester |
US5288764A (en) * | 1993-01-29 | 1994-02-22 | Amoco Corporation | Increased throughput in foaming and other melt fabrication of polyester |
IL110514A0 (en) * | 1993-10-04 | 1994-10-21 | Eastman Chem Co | Concentrates for improving polyester compositions and a method for preparing such compositions |
JP3523876B2 (ja) | 1994-02-17 | 2004-04-26 | シメッド ライフ システムズ インコーポレイテッド | カテーテルバルーンの製造方法 |
US5482977A (en) * | 1995-05-08 | 1996-01-09 | Eastman Chemical Company | Foamable branched polyesters |
US5696176A (en) * | 1995-09-22 | 1997-12-09 | Eastman Chemical Company | Foamable polyester compositions having a low level of unreacted branching agent |
GB9522006D0 (en) * | 1995-10-27 | 1996-01-03 | Borden Uk Ltd | Plastics articles |
ES2153984T3 (es) * | 1995-11-08 | 2001-03-16 | Scimed Life Systems Inc | Procedimiento de formacion de balon mediante estrechamiento por estirado en frio. |
US5661193A (en) * | 1996-05-10 | 1997-08-26 | Eastman Chemical Company | Biodegradable foamable co-polyester compositions |
IT1283160B1 (it) * | 1996-07-15 | 1998-04-07 | Sinco Eng Spa | Film poliestere soffiato |
US6083585A (en) | 1996-09-23 | 2000-07-04 | Bp Amoco Corporation | Oxygen scavenging condensation copolymers for bottles and packaging articles |
JP3947885B2 (ja) * | 1997-07-02 | 2007-07-25 | ブラザー工業株式会社 | 画像読取装置 |
US5922782A (en) * | 1997-07-23 | 1999-07-13 | Eastman Chemical Company | Foamable copolyesters prepared from divalent metal containing co-ionomers |
AUPP610798A0 (en) * | 1998-09-23 | 1998-10-15 | Swig Pty Ltd | Improved polymers |
IT1317870B1 (it) * | 2000-03-02 | 2003-07-15 | Sinco Ricerche Spa | Film soffiati da resina poliestere espansa. |
US7625994B2 (en) | 2002-07-30 | 2009-12-01 | E.I. Du Pont De Nemours And Company | Sulfonated aliphatic-aromatic copolyetheresters |
US20040024102A1 (en) * | 2002-07-30 | 2004-02-05 | Hayes Richard Allen | Sulfonated aliphatic-aromatic polyetherester films, coatings, and laminates |
US7220477B2 (en) * | 2003-03-19 | 2007-05-22 | Toyo Seikan Kaisha, Ltd. | Film for lamination and laminated member using the film |
US7888405B2 (en) | 2004-01-30 | 2011-02-15 | E. I. Du Pont De Nemours And Company | Aliphatic-aromatic polyesters, and articles made therefrom |
US20070059511A1 (en) * | 2004-03-31 | 2007-03-15 | Edwards Walter L | Low density foamed polymers |
US8080191B2 (en) | 2006-10-20 | 2011-12-20 | Pepsico, Inc. | Extrudable polyethylene terephthalate blend |
PL2268737T3 (pl) | 2008-04-18 | 2019-09-30 | Pepsico, Inc. | Kompozycje poliestrowe i sposób wytwarzania wyrobów przez wytłaczanie z rozdmuchem |
ES2426774T3 (es) | 2008-06-25 | 2013-10-25 | Metabolix, Inc. | Composiciones de PHA ramificado, procedimientos para su producción y uso en aplicaciones |
CN102089410A (zh) * | 2008-07-10 | 2011-06-08 | 卢布里佐尔公司 | 在燃料中作为摩擦改性剂的羧酸衍生物 |
PL2163577T3 (pl) | 2008-09-15 | 2013-01-31 | Armacell Entpr Gmbh & Co Kg | Przedłużacze łańcucha i spienione termoplastyczne materiały komórkowe otrzymywane w procesie wytłaczania reaktywnego za pomocą tych przedłużaczy łańcucha |
CN102159622A (zh) * | 2008-09-23 | 2011-08-17 | 聂克斯姆化学有限公司 | 炔属聚酰胺 |
US8906276B2 (en) | 2009-03-11 | 2014-12-09 | Graham Packaging Company, L.P. | Extrusion blow molded PET container and method of making |
US20140018460A1 (en) | 2011-03-10 | 2014-01-16 | Nexam Chemical Ab | Compositions for improving polyesters |
JP5891015B2 (ja) * | 2011-06-22 | 2016-03-22 | 株式会社カネカ | 高熱伝導性熱可塑性樹脂組成物 |
PL2671911T3 (pl) | 2012-06-05 | 2017-05-31 | Armacell Enterprise Gmbh & Co. Kg | Materiał piankowy o bardzo niskiej przewodności cieplnej oraz sposób wytwarzania materiału piankowego |
US9475930B2 (en) | 2012-08-17 | 2016-10-25 | Metabolix, Inc. | Biobased rubber modifiers for polymer blends |
EP3004225A1 (fr) | 2013-05-30 | 2016-04-13 | Metabolix, Inc. | Mélanges de recyclat |
RU2704481C2 (ru) * | 2013-08-30 | 2019-10-29 | Дзе Кока-Кола Компани | Сополимеры полиэтиленфураноата и способы |
EP2851391A1 (fr) * | 2013-09-23 | 2015-03-25 | Anheuser-Busch InBev S.A. | Polyester thermoplastique présentant de meilleures propriétés de résistance aux chocs et de barrière |
CN106459544B (zh) | 2014-03-27 | 2021-10-01 | Cj 第一制糖株式会社 | 高度填充的聚合物体系 |
US20180009647A1 (en) | 2015-01-30 | 2018-01-11 | Anheuser-Busch Inbev S.A. | Pressurized Beverage Concentrates and Appliances and Methods for Producing Beverages Therefrom |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3533994A (en) * | 1968-02-20 | 1970-10-13 | Fmc Corp | Stabilized polyesters |
US3553157A (en) * | 1967-05-23 | 1971-01-05 | Ici Ltd | Polyester compositions and shaping process |
FR2207946A1 (fr) * | 1972-11-29 | 1974-06-21 | Gen Electric |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3822332A (en) * | 1970-08-07 | 1974-07-02 | Ciba Geigy Ag | Process for the production of amorphous transparent polyethylene mouldings by the combined injection and blow moulding technique |
US3660557A (en) * | 1970-11-12 | 1972-05-02 | Firestone Tire & Rubber Co | Polyester product |
US3733309A (en) * | 1970-11-30 | 1973-05-15 | Du Pont | Biaxially oriented poly(ethylene terephthalate)bottle |
US3803275A (en) * | 1971-03-26 | 1974-04-09 | Du Pont | Process for making an amorphous polyethylene terephthalate container |
US3814786A (en) * | 1972-06-12 | 1974-06-04 | Celanese Corp | Process for making polybutylene terephthalate blow molded article |
-
1977
- 1977-09-02 US US05/830,240 patent/US4145466A/en not_active Expired - Lifetime
-
1978
- 1978-05-26 GB GB23080/78A patent/GB1596976A/en not_active Expired
- 1978-05-26 GB GB16810/80A patent/GB1596977A/en not_active Expired
- 1978-08-21 CA CA000309688A patent/CA1117243A/fr not_active Expired
- 1978-08-30 DE DE19782837846 patent/DE2837846A1/de not_active Withdrawn
- 1978-08-31 NL NL7808948A patent/NL7808948A/xx not_active Application Discontinuation
- 1978-09-01 JP JP10739778A patent/JPS5450062A/ja active Pending
- 1978-09-01 FR FR7825345A patent/FR2401945A1/fr active Granted
- 1978-09-01 SE SE7809240A patent/SE433359B/sv unknown
- 1978-09-01 IT IT6903078A patent/IT1108761B/it active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3553157A (en) * | 1967-05-23 | 1971-01-05 | Ici Ltd | Polyester compositions and shaping process |
US3533994A (en) * | 1968-02-20 | 1970-10-13 | Fmc Corp | Stabilized polyesters |
FR2207946A1 (fr) * | 1972-11-29 | 1974-06-21 | Gen Electric |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1986000319A1 (fr) * | 1984-06-28 | 1986-01-16 | Bergwerksverband Gmbh | Procede de preparation de polymeres synthetiques sous forme de mousses |
EP0547032A3 (en) * | 1988-12-01 | 1993-08-11 | Sekisui Kaseihin Kogyo Kabushiki Kaisha | Polyester resin foam sheet |
EP0372846A3 (fr) * | 1988-12-01 | 1991-07-10 | Sekisui Kaseihin Kogyo Kabushiki Kaisha | Procédé pour préparer une mousse de résine de polyester |
EP0547033A2 (fr) * | 1988-12-01 | 1993-06-16 | Sekisui Kaseihin Kogyo Kabushiki Kaisha | Conteneur pour aliments |
EP0547032A2 (fr) * | 1988-12-01 | 1993-06-16 | Sekisui Kaseihin Kogyo Kabushiki Kaisha | Feuille de mousse de résine polyester |
EP0552813A2 (fr) * | 1988-12-01 | 1993-07-28 | Sekisui Kaseihin Kogyo Kabushiki Kaisha | Procédé de préparation de mousse de résine polyester |
EP0552813A3 (fr) * | 1988-12-01 | 1993-08-11 | Sekisui Kaseihin Kogyo Kabushiki Kaisha | Procédé de préparation de mousse de résine polyester |
EP0372846A2 (fr) * | 1988-12-01 | 1990-06-13 | Sekisui Kaseihin Kogyo Kabushiki Kaisha | Procédé pour préparer une mousse de résine de polyester |
EP0547033A3 (en) * | 1988-12-01 | 1993-08-11 | Sekisui Kaseihin Kogyo Kabushiki Kaisha | Food container |
EP0475142A2 (fr) * | 1990-09-05 | 1992-03-18 | Harold Verity Smith | Composition de moulage à base du produit de réaction d'un polyéréphatalate d'éthylène et d'un copolymère d'anhydride maléique |
EP0475142A3 (en) * | 1990-09-05 | 1992-10-07 | Harold Verity Smith | Moulding composition of polyethylene terephthalate reacted with a copolymer of maleic anhydride |
EP1061093A2 (fr) * | 1999-06-16 | 2000-12-20 | Nippon Shokubai Co., Ltd. | Procédé de préparation d'une composition de résine thermoplastique à poids moléculaire élevé et leur utilisation |
EP1061093A3 (fr) * | 1999-06-16 | 2001-09-12 | Nippon Shokubai Co., Ltd. | Procédé de préparation d'une composition de résine thermoplastique à poids moléculaire élevé et leur utilisation |
US6441104B1 (en) | 1999-06-16 | 2002-08-27 | Nippon Shokubai Co., Ltd. | Process for producing high molecular weight thermoplastic resin composition and its use |
Also Published As
Publication number | Publication date |
---|---|
DE2837846A1 (de) | 1979-03-15 |
IT1108761B (it) | 1985-12-09 |
FR2401945B1 (fr) | 1983-08-05 |
SE433359B (sv) | 1984-05-21 |
SE7809240L (sv) | 1979-03-03 |
GB1596977A (en) | 1981-09-03 |
GB1596976A (en) | 1981-09-03 |
JPS5450062A (en) | 1979-04-19 |
NL7808948A (nl) | 1979-03-06 |
US4145466A (en) | 1979-03-20 |
CA1117243A (fr) | 1982-01-26 |
IT7869030A0 (it) | 1978-09-01 |
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