DE2631755A1 - Neue, flammhemmende polycarbonat- zusammensetzungen - Google Patents
Neue, flammhemmende polycarbonat- zusammensetzungenInfo
- Publication number
- DE2631755A1 DE2631755A1 DE19762631755 DE2631755A DE2631755A1 DE 2631755 A1 DE2631755 A1 DE 2631755A1 DE 19762631755 DE19762631755 DE 19762631755 DE 2631755 A DE2631755 A DE 2631755A DE 2631755 A1 DE2631755 A1 DE 2631755A1
- Authority
- DE
- Germany
- Prior art keywords
- polycarbonate
- composition according
- additive
- flame
- flame retardant
- 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.)
- Withdrawn
Links
- 229920000515 polycarbonate Polymers 0.000 title claims description 61
- 239000004417 polycarbonate Substances 0.000 title claims description 61
- 239000000203 mixture Substances 0.000 title claims description 32
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 32
- 239000003063 flame retardant Substances 0.000 claims description 30
- 125000003118 aryl group Chemical group 0.000 claims description 28
- 239000000654 additive Substances 0.000 claims description 25
- 230000000996 additive effect Effects 0.000 claims description 21
- 239000003365 glass fiber Substances 0.000 claims description 21
- 239000011734 sodium Substances 0.000 claims description 18
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims description 11
- -1 alkaline earth metal salt Chemical class 0.000 claims description 8
- 239000011575 calcium Substances 0.000 claims description 8
- 239000003513 alkali Substances 0.000 claims description 7
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 claims description 6
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 5
- 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 description 5
- 229910052791 calcium Inorganic materials 0.000 claims description 5
- 229910052739 hydrogen Inorganic materials 0.000 claims description 5
- 239000001257 hydrogen Substances 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 229910052708 sodium Inorganic materials 0.000 claims description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 3
- 125000000217 alkyl group Chemical group 0.000 claims description 2
- 150000002431 hydrogen Chemical class 0.000 claims description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical class [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 claims 1
- 150000004764 thiosulfuric acid derivatives Chemical class 0.000 claims 1
- 150000003464 sulfur compounds Chemical class 0.000 description 10
- 238000012360 testing method Methods 0.000 description 9
- 239000000463 material Substances 0.000 description 8
- 150000001875 compounds Chemical class 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 5
- 230000008033 biological extinction Effects 0.000 description 5
- 239000000835 fiber Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 229910052717 sulfur Inorganic materials 0.000 description 5
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 4
- GRWZHXKQBITJKP-UHFFFAOYSA-L dithionite(2-) Chemical compound [O-]S(=O)S([O-])=O GRWZHXKQBITJKP-UHFFFAOYSA-L 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- DHCDFWKWKRSZHF-UHFFFAOYSA-N sulfurothioic S-acid Chemical compound OS(O)(=O)=S DHCDFWKWKRSZHF-UHFFFAOYSA-N 0.000 description 4
- 125000004203 4-hydroxyphenyl group Chemical group [H]OC1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 239000008188 pellet Substances 0.000 description 3
- 239000004431 polycarbonate resin Substances 0.000 description 3
- 229920005668 polycarbonate resin Polymers 0.000 description 3
- 239000002243 precursor Substances 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- 125000004434 sulfur atom Chemical group 0.000 description 3
- QIGBRXMKCJKVMJ-UHFFFAOYSA-N Hydroquinone Chemical compound OC1=CC=C(O)C=C1 QIGBRXMKCJKVMJ-UHFFFAOYSA-N 0.000 description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
- 239000000370 acceptor Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 125000004464 hydroxyphenyl group Chemical group 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- 239000011591 potassium Substances 0.000 description 2
- GHMLBKRAJCXXBS-UHFFFAOYSA-N resorcinol Chemical compound OC1=CC=CC(O)=C1 GHMLBKRAJCXXBS-UHFFFAOYSA-N 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 2
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 description 1
- VPWNQTHUCYMVMZ-UHFFFAOYSA-N 4,4'-sulfonyldiphenol Chemical class C1=CC(O)=CC=C1S(=O)(=O)C1=CC=C(O)C=C1 VPWNQTHUCYMVMZ-UHFFFAOYSA-N 0.000 description 1
- 229930185605 Bisphenol Natural products 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 229920004142 LEXAN™ Polymers 0.000 description 1
- 239000004418 Lexan Substances 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical group [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 150000001335 aliphatic alkanes Chemical class 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229940106691 bisphenol a Drugs 0.000 description 1
- 229910052792 caesium Inorganic materials 0.000 description 1
- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical compound [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- DDKMFOUTRRODRE-UHFFFAOYSA-N chloromethanone Chemical compound Cl[C]=O DDKMFOUTRRODRE-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 150000005690 diesters Chemical class 0.000 description 1
- 229940075933 dithionate Drugs 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 150000002170 ethers Chemical class 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 239000012757 flame retardant agent Substances 0.000 description 1
- 150000002334 glycols Chemical class 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 125000005843 halogen group Chemical group 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000006082 mold release agent Substances 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000011541 reaction mixture Substances 0.000 description 1
- 239000012763 reinforcing filler Substances 0.000 description 1
- 229910052701 rubidium Inorganic materials 0.000 description 1
- IGLNJRXAVVLDKE-UHFFFAOYSA-N rubidium atom Chemical compound [Rb] IGLNJRXAVVLDKE-UHFFFAOYSA-N 0.000 description 1
- 235000010265 sodium sulphite Nutrition 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 150000004763 sulfides Chemical class 0.000 description 1
- 150000003457 sulfones Chemical class 0.000 description 1
- 150000003462 sulfoxides Chemical class 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Classifications
-
- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
-
- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/32—Phosphorus-containing 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
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S260/00—Chemistry of carbon compounds
- Y10S260/24—Flameproof
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US05/597,006 US4028297A (en) | 1975-07-18 | 1975-07-18 | Novel flame retardant polycarbonate compositions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE2631755A1 true DE2631755A1 (de) | 1977-02-03 |
Family
ID=24389663
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19762631755 Withdrawn DE2631755A1 (de) | 1975-07-18 | 1976-07-15 | Neue, flammhemmende polycarbonat- zusammensetzungen |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US4028297A (enExample) |
| JP (1) | JPS6011752B2 (enExample) |
| DE (1) | DE2631755A1 (enExample) |
| FR (1) | FR2323741A1 (enExample) |
| GB (1) | GB1551435A (enExample) |
| IT (1) | IT1062480B (enExample) |
| MX (1) | MX143367A (enExample) |
| NL (1) | NL7607803A (enExample) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0294861A1 (en) * | 1987-06-12 | 1988-12-14 | General Electric Company | Polymer mixture having an aromatic polycarbonate, an aromatic polyester and a pigment |
| EP0295730A1 (en) * | 1987-06-12 | 1988-12-21 | General Electric Company | Polymer mixture comprising an aromatic polycarbonate and an aromatic polyester |
Families Citing this family (27)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4268429A (en) * | 1975-07-18 | 1981-05-19 | General Electric Company | Novel flame retardant polycarbonate compositions |
| US4454275A (en) * | 1981-02-20 | 1984-06-12 | General Electric Company | Flame retardant copolyester-carbonate compositions |
| US4408005A (en) * | 1982-03-22 | 1983-10-04 | The Dow Chemical Company | Flame retardant polycarbonates |
| US4404303A (en) * | 1982-03-24 | 1983-09-13 | The Dow Chemical Company | Carbonate polymers containing a barbituate as an ignition depressant |
| US4600742A (en) * | 1984-08-17 | 1986-07-15 | The Lubrizol Corporation | Polycarbonate compositions |
| EP0174684B1 (en) * | 1984-09-04 | 1988-10-19 | ENICHEM TECNORESINE S.p.A. | Self-extinguishing polycarbonate composition |
| JPS6389455U (enExample) * | 1986-12-01 | 1988-06-10 | ||
| US4965308A (en) * | 1988-05-25 | 1990-10-23 | General Electric Company | Polymer mixture comprising an aromatic polycarbonate, an aromatic polyester and an inorganic sulfur compound |
| US5292803A (en) * | 1992-10-06 | 1994-03-08 | Sumitomo Chemical Company, Limited | Process for the production of polymeric polyols |
| JP2001098166A (ja) * | 1999-08-03 | 2001-04-10 | Lewin Menachem | 難燃性重合組成物 |
| US6353046B1 (en) | 2000-04-28 | 2002-03-05 | General Electric Company | Fire-retarded polycarbonate resin composition |
| US6730720B2 (en) * | 2000-12-27 | 2004-05-04 | General Electric Company | Method for reducing haze in a fire resistant polycarbonate composition |
| US6518340B1 (en) * | 2001-08-07 | 2003-02-11 | General Electric Company | Polycarbonate resin compositions and articles therefrom |
| US7390450B2 (en) * | 2002-06-07 | 2008-06-24 | General Electric Company | Process for preparing a fire resistant polycarbonate composition |
| US6790899B2 (en) * | 2002-10-29 | 2004-09-14 | General Electric Company | Method for making fire-retarded polycarbonate and related compositions |
| US7019059B2 (en) * | 2002-12-16 | 2006-03-28 | General Electric Company | Method for making fire-retarded glass-filled polycarbonate and related compositions |
| US20050009968A1 (en) * | 2003-06-28 | 2005-01-13 | General Electric Company | Transparent Flame Retardant Polycarbonate Compositions |
| KR101126980B1 (ko) * | 2003-07-10 | 2012-03-23 | 사빅 이노베이티브 플라스틱스 아이피 비.브이. | 난연화된 폴리카보네이트 수지 조성물 |
| NL1029640C2 (nl) * | 2005-03-04 | 2006-09-06 | Stork Food & Dairy Systems Bv | Vulklep met een kleplichaam met een in hoofdzaak cilindrisch verdringingsdeel. |
| US7531615B2 (en) * | 2006-01-04 | 2009-05-12 | Sabic Innovative Platics Ip B.V. | Thermally stable polycarbonates, thermoplastic compositions thereof, and articles formed therefrom |
| US7514523B2 (en) * | 2006-01-05 | 2009-04-07 | Sabic Innovative Plastics Ip B.V. | Polycarbonate compositions and articles formed therefrom, with matte surfaces and high light transmissions |
| US7728059B2 (en) * | 2006-02-14 | 2010-06-01 | Sabic Innovative Plastics Ip B.V. | Polycarbonate compositions and articles formed therefrom |
| US7632881B2 (en) | 2006-06-22 | 2009-12-15 | Sabic Innovative Plastics Ip B.V. | Polycarbonate compositions and articles formed therefrom |
| US20080015292A1 (en) * | 2006-07-12 | 2008-01-17 | General Electric Company | Flame retardant and scratch resistant thermoplastic polycarbonate compositions |
| US7732516B2 (en) * | 2008-01-31 | 2010-06-08 | Sabic Innovative Plastics Ip B.V. | Flame retardant polyimide/polyester-polycarbonate compositions, methods of manufacture, and articles formed therefrom |
| EP3001841B1 (en) | 2014-03-20 | 2017-04-19 | SABIC Global Technologies B.V. | Polycarbonate compositions, methods of their manufacture, and articles thereof |
| DE102020205101A1 (de) | 2020-04-22 | 2021-10-28 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung eingetragener Verein | Verwendung von anorganischen Sulfiten und/oder Thiosulfaten zur Stabilisierung von thermoplastischen Kondensationspolymeren, stabilisierte Formmasse und hieraus hergestellte Formmassen und Formteile |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3053778A (en) * | 1959-12-09 | 1962-09-11 | Allied Chem | Polyurethane foam resistant to discoloration and process for making same |
| US3560431A (en) * | 1968-07-09 | 1971-02-02 | Gene C Weedon | Prevention of yellowing in polyamides |
| US3856746A (en) * | 1968-07-22 | 1974-12-24 | Lion Fat Oil Co Ltd | Thermoplastic composition for molding |
| BE756046A (fr) * | 1969-09-12 | 1971-03-11 | Monsanto Co | Composition retardatrice de combustion |
| US3739060A (en) * | 1969-12-09 | 1973-06-12 | Lion Fat Oil Co Ltd | Method of preparing calcium sulfite for use as a filler for plastics |
| US3817907A (en) * | 1971-03-31 | 1974-06-18 | Bayer Ag | Thermoplastic molding compositions and molded articles |
| US3945974A (en) * | 1973-12-20 | 1976-03-23 | N L Industries, Inc. | Smoke suppressants for halogen-containing plastic compositions |
-
1975
- 1975-07-18 US US05/597,006 patent/US4028297A/en not_active Expired - Lifetime
-
1976
- 1976-07-09 FR FR7621019A patent/FR2323741A1/fr active Granted
- 1976-07-14 NL NL7607803A patent/NL7607803A/xx not_active Application Discontinuation
- 1976-07-15 DE DE19762631755 patent/DE2631755A1/de not_active Withdrawn
- 1976-07-16 MX MX165559A patent/MX143367A/es unknown
- 1976-07-16 GB GB29651/76A patent/GB1551435A/en not_active Expired
- 1976-07-16 JP JP51084046A patent/JPS6011752B2/ja not_active Expired
- 1976-07-19 IT IT25446/76A patent/IT1062480B/it active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0294861A1 (en) * | 1987-06-12 | 1988-12-14 | General Electric Company | Polymer mixture having an aromatic polycarbonate, an aromatic polyester and a pigment |
| EP0295730A1 (en) * | 1987-06-12 | 1988-12-21 | General Electric Company | Polymer mixture comprising an aromatic polycarbonate and an aromatic polyester |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2323741B1 (enExample) | 1981-10-23 |
| AU1592876A (en) | 1978-01-19 |
| JPS5217558A (en) | 1977-02-09 |
| IT1062480B (it) | 1984-10-10 |
| JPS6011752B2 (ja) | 1985-03-27 |
| FR2323741A1 (fr) | 1977-04-08 |
| US4028297A (en) | 1977-06-07 |
| GB1551435A (en) | 1979-08-30 |
| MX143367A (es) | 1981-04-27 |
| NL7607803A (nl) | 1977-01-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 8110 | Request for examination paragraph 44 | ||
| 8130 | Withdrawal |