ES384216A1 - Un procedimiento para preparar un poliuretano termoplasti- co opticamente transparente y sustancialmente incoloro. - Google Patents
Un procedimiento para preparar un poliuretano termoplasti- co opticamente transparente y sustancialmente incoloro.Info
- Publication number
- ES384216A1 ES384216A1 ES384216A ES384216A ES384216A1 ES 384216 A1 ES384216 A1 ES 384216A1 ES 384216 A ES384216 A ES 384216A ES 384216 A ES384216 A ES 384216A ES 384216 A1 ES384216 A1 ES 384216A1
- Authority
- ES
- Spain
- Prior art keywords
- trans
- isocyanate
- diol
- molecular weight
- trans isomer
- 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
Links
- 239000004433 Thermoplastic polyurethane Substances 0.000 title abstract 2
- 229920002803 thermoplastic polyurethane Polymers 0.000 title abstract 2
- 150000002009 diols Chemical class 0.000 abstract 6
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 abstract 5
- 239000012948 isocyanate Substances 0.000 abstract 5
- 230000003014 reinforcing effect Effects 0.000 abstract 3
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 abstract 2
- KORSJDCBLAPZEQ-UHFFFAOYSA-N dicyclohexylmethane-4,4'-diisocyanate Chemical compound C1CC(N=C=O)CCC1CC1CCC(N=C=O)CC1 KORSJDCBLAPZEQ-UHFFFAOYSA-N 0.000 abstract 2
- 239000004721 Polyphenylene oxide Substances 0.000 abstract 1
- 125000001931 aliphatic group Chemical group 0.000 abstract 1
- 239000003054 catalyst Substances 0.000 abstract 1
- 238000001879 gelation Methods 0.000 abstract 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 abstract 1
- 239000004615 ingredient Substances 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 238000002844 melting Methods 0.000 abstract 1
- 230000008018 melting Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- 239000000203 mixture Substances 0.000 abstract 1
- -1 poly aliphatic isocyanate Chemical class 0.000 abstract 1
- 229920000570 polyether Polymers 0.000 abstract 1
- 229920001228 polyisocyanate Polymers 0.000 abstract 1
- 239000005056 polyisocyanate Substances 0.000 abstract 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
- B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
- B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
- B32B17/1055—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
- B32B17/1077—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer containing polyurethane
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/40—Layered products comprising a layer of synthetic resin comprising polyurethanes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
- B32B9/005—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising one layer of ceramic material, e.g. porcelain, ceramic tile
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
- B32B9/04—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B9/045—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- 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
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/08—Processes
- C08G18/0895—Manufacture of polymers by continuous processes
-
- 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
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
- C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
- C08G18/6603—Compounds of groups C08G18/42, C08G18/48, or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38
- C08G18/6607—Compounds of groups C08G18/42, C08G18/48, or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/3203
-
- 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
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/75—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic
- C08G18/758—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing two or more cycloaliphatic rings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2375/00—Polyureas; Polyurethanes
-
- 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]
- Y10T428/31551—Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]
- Y10T428/31598—Next to silicon-containing [silicone, cement, etc.] layer
- Y10T428/31601—Quartz or glass
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)
- Manufacturing & Machinery (AREA)
- Ceramic Engineering (AREA)
- Polyurethanes Or Polyureas (AREA)
- Laminated Bodies (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Adhesives Or Adhesive Processes (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US86823569A | 1969-10-21 | 1969-10-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| ES384216A1 true ES384216A1 (es) | 1973-01-01 |
Family
ID=25351290
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ES384216A Expired ES384216A1 (es) | 1969-10-21 | 1970-10-02 | Un procedimiento para preparar un poliuretano termoplasti- co opticamente transparente y sustancialmente incoloro. |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US3620905A (es) |
| JP (2) | JPS4843200B1 (es) |
| CA (1) | CA970096A (es) |
| DE (1) | DE2051027C3 (es) |
| ES (1) | ES384216A1 (es) |
| FR (1) | FR2066227A5 (es) |
| GB (1) | GB1323766A (es) |
| SE (2) | SE365810B (es) |
| ZA (1) | ZA706491B (es) |
Families Citing this family (60)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4039719A (en) * | 1967-12-29 | 1977-08-02 | Ppg Industries, Inc. | Laminated safety glass |
| US3931113A (en) * | 1971-06-21 | 1976-01-06 | Ppg Industries, Inc. | Impact-resistant thermoplastic polyester urethanes |
| CA974441A (en) * | 1971-06-21 | 1975-09-16 | Andrew J. Kaman | Transparent, impact-resistant poly(ester-urethane) laminates |
| US4041208A (en) * | 1971-06-21 | 1977-08-09 | Ppg Industries, Inc. | Transparent, impact-resistant polyesterurethane laminates |
| US3808077A (en) * | 1971-09-16 | 1974-04-30 | Ppg Industries Inc | Method for laminating plastic to glass employing glass mold |
| BE794206A (fr) * | 1972-01-19 | 1973-07-18 | Monsanto Co | Intercalaire en polyurethane pour verre de securite feuillete |
| US3866242A (en) * | 1972-10-27 | 1975-02-18 | Goodyear Aerospace Corp | Protective shield |
| US3900446A (en) * | 1972-12-08 | 1975-08-19 | Monsanto Co | Polyurethane interlayer for laminated safety glass |
| US3900655A (en) * | 1973-05-14 | 1975-08-19 | Atlantic Richfield Co | Laminated safety glass and/or plastic |
| US4010311A (en) * | 1973-09-14 | 1977-03-01 | Ppg Industries, Inc. | Impact-resistant glass-polyesterurethane laminates |
| US3915937A (en) * | 1974-05-10 | 1975-10-28 | Uniroyal Inc | Poly(oxypropylene) glycol based polyurethane elastomers suitable for automotive body parts |
| US3945981A (en) * | 1974-11-08 | 1976-03-23 | Uniroyal, Inc. | Light stable polyurethane elastomer prepared from aliphatic isocyanate using thio tin organic compound containing sulfur attached to tin as heat activated catalyst |
| US4177099A (en) * | 1975-09-02 | 1979-12-04 | Ppg Industries, Inc. | Method of bonding polyurethane sheeting to acrylic or polyurethane sheeting in production of transparent windows |
| US4101529A (en) * | 1976-02-04 | 1978-07-18 | Ppg Industries, Inc. | Hard, optically clear polyurethane articles |
| US4051111A (en) * | 1976-08-20 | 1977-09-27 | The B. F. Goodrich Company | Injection moldable polyurethanes |
| US4131606A (en) * | 1978-01-03 | 1978-12-26 | Ppg Industries, Inc. | Poly(lactone)urethane curable at [castable] ambient temperature [curable polyurethane interlayer] using butylstannoic acid catalyst |
| US4131605A (en) * | 1978-01-03 | 1978-12-26 | Ppg Industries, Inc. | Poly(ether)urethane curable at ambient temperature using butylstannoic acid catalyst |
| US4241140A (en) * | 1978-04-12 | 1980-12-23 | Ppg Industries, Inc. | Laminated safety glass with polyurethane film |
| CA1174577A (en) * | 1980-04-30 | 1984-09-18 | Vernon G. Ammons | Polyurethane composition for safety glass interlayer |
| US4424335A (en) | 1981-02-27 | 1984-01-03 | Thermo Electron Corporation | Keratoprosthetic polyurethane |
| JPS59143308A (ja) * | 1983-02-04 | 1984-08-16 | Mitsubishi Electric Corp | 紙巻線 |
| DE3318730A1 (de) * | 1983-05-21 | 1984-11-22 | Akzo Gmbh, 5600 Wuppertal | Biokompatible polyurethane |
| JPS60222249A (ja) * | 1984-04-20 | 1985-11-06 | 旭硝子株式会社 | 積層安全ガラスおよびその材料 |
| US4663417A (en) * | 1984-06-04 | 1987-05-05 | Sierracin Corporation | Low temperature laminatable polyurethane |
| US4666758A (en) * | 1984-06-04 | 1987-05-19 | Sierracin Corporation | Low temperature laminatable polyurethane |
| US4592947A (en) * | 1984-06-04 | 1986-06-03 | Sierracin Corporation | Low temperature laminatable polyurethane |
| FR2605267B1 (fr) * | 1986-10-15 | 1989-06-30 | Goeury Walter | Panneau de protection et notamment ecran balistique |
| US4857407A (en) * | 1987-06-16 | 1989-08-15 | Ppg Industries, Inc. | Low modulus interlayer |
| US4814412A (en) * | 1987-12-17 | 1989-03-21 | W. L. Gore & Associates, Inc. | Two component polyurethane system for casting expanded polytetrafluoroethylene |
| US5028658A (en) * | 1989-09-18 | 1991-07-02 | Monsanto Company | Sheet of polyvinyl butyral and polyurethane |
| US5013810A (en) * | 1990-02-09 | 1991-05-07 | Mobay Corporation | Impact absorbing media |
| US5208315A (en) * | 1991-10-08 | 1993-05-04 | Miles Inc. | Elastomers based on 4,4'-diisocyanato dicyclohexylmethane enriched in the trans, trans isomer which contain essentially no chain extenders |
| PT770102E (pt) * | 1994-07-14 | 2002-03-28 | Gates Corp | Elastomeros de poliuretano/ureia resistentes a altas temperaturas |
| US5510445A (en) * | 1994-11-22 | 1996-04-23 | Bayer Corporation | Process for castable polyurea elastomers |
| US5962617A (en) * | 1995-02-02 | 1999-10-05 | Simula Inc. | Impact resistant polyurethane and method of manufacture thereof |
| US6127505A (en) * | 1995-02-02 | 2000-10-03 | Simula Inc. | Impact resistant polyurethane and method of manufacture thereof |
| JPH09286039A (ja) * | 1996-04-22 | 1997-11-04 | Komatsu Ltd | 板状複合体およびその製造法 |
| EP1010712B1 (de) | 1998-12-16 | 2009-10-28 | Bayer MaterialScience AG | Aliphatische thermoplastische Polyurethane, Verfahren zu ihrer Herstellung und ihre Verwendung |
| EP1028132A1 (de) * | 1999-02-09 | 2000-08-16 | Basf Aktiengesellschaft | Verfahren zur Herstellung von thermoplastischen Polyurethanen |
| DE19939112A1 (de) * | 1999-08-18 | 2001-02-22 | Basf Ag | Thermoplastische Polyurethane |
| US7132167B2 (en) * | 2002-09-27 | 2006-11-07 | Rexnord Corporation | Composite article having thermoplastic elastomer region on thermoplastic substrate |
| CA2454725C (en) * | 2003-12-31 | 2008-08-05 | Chrislan Ceramics And Glassware Decorating Inc. | Safety tap handle |
| US20070283801A1 (en) * | 2006-06-09 | 2007-12-13 | Armorsmith Company | Armor apparatus and method |
| DE102006029613A1 (de) * | 2006-06-26 | 2007-12-27 | Röhm Gmbh | Transparenter Kunststoff-Verbund |
| KR101421762B1 (ko) * | 2006-11-01 | 2014-07-22 | 다우 글로벌 테크놀로지스 엘엘씨 | 비극성 폴리올레핀 및 폴리우레탄을 포함하는 물품 및 이것의 제조 방법 및 용도 |
| MX2009006749A (es) | 2006-12-21 | 2009-08-20 | Dow Global Technologies Inc | Composiciones de poliolefina y articulos preparados a partir de las mismas, y metodos para su elaboracion. |
| US9744747B2 (en) * | 2007-01-12 | 2017-08-29 | Vitro, S.A.B. De C.V. | Window interlayer with sound attenuation properties |
| US20090229216A1 (en) * | 2008-03-17 | 2009-09-17 | Muhler Laminated Glass, Inc. | Impact resistant multipane window |
| US20100000181A1 (en) * | 2008-07-03 | 2010-01-07 | Muhler Laminated Glass, Inc. | Impact resistant multipane window |
| US8789324B2 (en) * | 2007-02-13 | 2014-07-29 | Henry M. Hay | Impact resistant window |
| US20080196317A1 (en) * | 2007-02-13 | 2008-08-21 | Muhler Laminated Glass, Inc. | Impact resistant multipane window |
| US20080190070A1 (en) * | 2007-02-13 | 2008-08-14 | Muhler Laminated Glass, Inc. | Impact resistant multipane window |
| EP2167561A1 (en) * | 2007-07-12 | 2010-03-31 | Dow Global Technologies Inc. | Prepolymers and polymers for elastomers |
| US9097835B2 (en) * | 2008-12-29 | 2015-08-04 | Basf Se | Light guides made of thermoplastic polyurethanes |
| US20120065307A1 (en) | 2009-06-18 | 2012-03-15 | Cogen Jeffrey M | Color-Stable, Halogen-Free Flame Retardant Compositions |
| TWI457393B (zh) * | 2009-11-12 | 2014-10-21 | 科騰聚合物美國有限責任公司 | 熱塑性聚胺基甲酸酯嵌段共聚物組合物 |
| IT1400743B1 (it) | 2010-06-30 | 2013-07-02 | Dow Global Technologies Inc | Composizioni polimeriche |
| US9500445B2 (en) * | 2013-09-10 | 2016-11-22 | The United States Of America As Represented By The Secretary Of The Army | Multi-layer matrix composite having improved energy absorption, dissipation and shock wave mitigation capabilities |
| US11059746B2 (en) | 2015-08-10 | 2021-07-13 | America as represented by the Secretary of the Army | Thermoplastic cycloaliphatic polyamide matrix resins for next-generation energy absorbing applications |
| CN108047415A (zh) * | 2018-01-10 | 2018-05-18 | 中国航发北京航空材料研究院 | 一种光学级热塑性聚氨酯弹性体及其制备方法 |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB731071A (en) * | 1951-07-19 | 1955-06-01 | Du Pont | Preparation of elastomers from polyalkylene ether glycols and diisocyanates |
| US3015650A (en) * | 1957-05-07 | 1962-01-02 | Goodrich Co B F | Thermoplastic polyesterurethanes |
| US3388032A (en) * | 1965-01-13 | 1968-06-11 | Mobay Chemical Corp | Laminated safety glass |
-
1969
- 1969-10-21 US US3620905D patent/US3620905A/en not_active Expired - Lifetime
-
1970
- 1970-09-18 CA CA093,560A patent/CA970096A/en not_active Expired
- 1970-09-22 ZA ZA706491A patent/ZA706491B/xx unknown
- 1970-10-02 ES ES384216A patent/ES384216A1/es not_active Expired
- 1970-10-17 DE DE2051027A patent/DE2051027C3/de not_active Expired
- 1970-10-20 GB GB4981670A patent/GB1323766A/en not_active Expired
- 1970-10-20 SE SE1412570A patent/SE365810B/xx unknown
- 1970-10-20 SE SE1706873A patent/SE393045B/xx unknown
- 1970-10-20 JP JP9172570A patent/JPS4843200B1/ja active Pending
- 1970-10-20 FR FR7037781A patent/FR2066227A5/fr not_active Expired
-
1973
- 1973-06-27 JP JP7183073A patent/JPS5328475B1/ja active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| FR2066227A5 (es) | 1971-08-06 |
| DE2051027B2 (de) | 1979-12-20 |
| SE365810B (es) | 1974-04-01 |
| DE2051027C3 (de) | 1980-08-28 |
| JPS5328475B1 (es) | 1978-08-15 |
| SE393045B (sv) | 1977-05-02 |
| US3620905A (en) | 1971-11-16 |
| GB1323766A (en) | 1973-07-18 |
| DE2051027A1 (de) | 1971-04-29 |
| JPS4843200B1 (es) | 1973-12-17 |
| ZA706491B (en) | 1971-05-27 |
| CA970096A (en) | 1975-06-24 |
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